diff options
Diffstat (limited to 'lib/ftp.c')
| -rw-r--r-- | lib/ftp.c | 3443 |
1 files changed, 2179 insertions, 1264 deletions
@@ -124,11 +124,20 @@ static CURLcode ftp_3rdparty_pretransfer(struct connectdata *conn); static CURLcode ftp_3rdparty_transfer(struct connectdata *conn); static CURLcode ftp_parse_url_path(struct connectdata *conn); static CURLcode ftp_cwd_and_create_path(struct connectdata *conn); -static CURLcode ftp_regular_transfer(struct connectdata *conn); +static CURLcode ftp_regular_transfer(struct connectdata *conn, bool *done); static CURLcode ftp_3rdparty(struct connectdata *conn); +static void ftp_pasv_verbose(struct connectdata *conn, + Curl_addrinfo *ai, + char *newhost, /* ascii version */ + int port); +static CURLcode ftp_state_post_rest(struct connectdata *conn); +static CURLcode ftp_state_post_cwd(struct connectdata *conn); +static CURLcode ftp_state_quote(struct connectdata *conn, + bool init, ftpstate instate); /* easy-to-use macro: */ #define FTPSENDF(x,y,z) if((result = Curl_ftpsendf(x,y,z))) return result +#define NBFTPSENDF(x,y,z) if((result = Curl_nbftpsendf(x,y,z))) return result static void freedirs(struct FTP *ftp) { @@ -226,6 +235,166 @@ static CURLcode AllowServerConnect(struct connectdata *conn) } +static CURLcode ftp_readresp(curl_socket_t sockfd, + struct connectdata *conn, + int *ftpcode, /* return the ftp-code if done */ + size_t *size) /* size of the response */ +{ + int perline; /* count bytes per line */ + bool keepon=TRUE; + ssize_t gotbytes; + char *ptr; + struct SessionHandle *data = conn->data; + char *line_start; + char *buf = data->state.buffer; + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + int code = 0; + + if (ftpcode) + *ftpcode = 0; /* 0 for errors or not done */ + + ptr=buf; + line_start = buf; + + perline=0; + keepon=TRUE; + + while((ftp->nread_resp<BUFSIZE) && (keepon && !result)) { + + if(ftp->cache) { + /* we had data in the "cache", copy that instead of doing an actual + * read + * + * ftp->cache_size is cast to int here. This should be safe, + * because it would have been populated with something of size + * int to begin with, even though its datatype may be larger + * than an int. + */ + memcpy(ptr, ftp->cache, (int)ftp->cache_size); + gotbytes = (int)ftp->cache_size; + free(ftp->cache); /* free the cache */ + ftp->cache = NULL; /* clear the pointer */ + ftp->cache_size = 0; /* zero the size just in case */ + } + else { + int res = Curl_read(conn, sockfd, ptr, BUFSIZE-ftp->nread_resp, + &gotbytes); + if(res < 0) + /* EWOULDBLOCK */ + return CURLE_OK; /* return */ + + if(CURLE_OK != res) + keepon = FALSE; + } + + if(!keepon) + ; + else if(gotbytes <= 0) { + keepon = FALSE; + result = CURLE_RECV_ERROR; + failf(data, "FTP response reading failed"); + } + else { + /* we got a whole chunk of data, which can be anything from one + * byte to a set of lines and possible just a piece of the last + * line */ + int i; + + conn->headerbytecount += gotbytes; + + ftp->nread_resp += gotbytes; + for(i = 0; i < gotbytes; ptr++, i++) { + perline++; + if(*ptr=='\n') { + /* a newline is CRLF in ftp-talk, so the CR is ignored as + the line isn't really terminated until the LF comes */ + + /* output debug output if that is requested */ + if(data->set.verbose) + Curl_debug(data, CURLINFO_HEADER_IN, line_start, perline, conn); + + /* + * We pass all response-lines to the callback function registered + * for "headers". The response lines can be seen as a kind of + * headers. + */ + result = Curl_client_write(data, CLIENTWRITE_HEADER, + line_start, perline); + if(result) + return result; + +#define lastline(line) (isdigit((int)line[0]) && isdigit((int)line[1]) && \ + isdigit((int)line[2]) && (' ' == line[3])) + + if(perline>3 && lastline(line_start)) { + /* This is the end of the last line, copy the last line to the + start of the buffer and zero terminate, for old times sake (and + krb4)! */ + char *meow; + int n; + for(meow=line_start, n=0; meow<ptr; meow++, n++) + buf[n] = *meow; + *meow=0; /* zero terminate */ + keepon=FALSE; + line_start = ptr+1; /* advance pointer */ + i++; /* skip this before getting out */ + + *size = ftp->nread_resp; /* size of the response */ + ftp->nread_resp = 0; /* restart */ + break; + } + perline=0; /* line starts over here */ + line_start = ptr+1; + } + } + if(!keepon && (i != gotbytes)) { + /* We found the end of the response lines, but we didn't parse the + full chunk of data we have read from the server. We therefore need + to store the rest of the data to be checked on the next invoke as + it may actually contain another end of response already! */ + ftp->cache_size = gotbytes - i; + ftp->cache = (char *)malloc((int)ftp->cache_size); + if(ftp->cache) + memcpy(ftp->cache, line_start, (int)ftp->cache_size); + else + return CURLE_OUT_OF_MEMORY; /**BANG**/ + } + } /* there was data */ + + } /* while there's buffer left and loop is requested */ + + if(!result) + code = atoi(buf); + +#ifdef HAVE_KRB4 + /* handle the security-oriented responses 6xx ***/ + /* FIXME: some errorchecking perhaps... ***/ + switch(code) { + case 631: + Curl_sec_read_msg(conn, buf, prot_safe); + break; + case 632: + Curl_sec_read_msg(conn, buf, prot_private); + break; + case 633: + Curl_sec_read_msg(conn, buf, prot_confidential); + break; + default: + /* normal ftp stuff we pass through! */ + break; + } +#endif + + *ftpcode=code; /* return the initial number like this */ + + + /* store the latest code for later retrieval */ + conn->data->info.httpcode=code; + + return result; +} + /* --- parse FTP server responses --- */ /* @@ -238,9 +407,9 @@ CURLcode Curl_GetFTPResponse(ssize_t *nreadp, /* return number of bytes read */ struct connectdata *conn, int *ftpcode) /* return the ftp-code */ { - /* Brand new implementation. - * We cannot read just one byte per read() and then go back to select() - * as it seems that the OpenSSL read() stuff doesn't grok that properly. + /* + * We cannot read just one byte per read() and then go back to select() as + * the OpenSSL read() doesn't grok that properly. * * Alas, read as much as possible, split up into lines, use the ending * line in a response or continue reading. */ @@ -450,692 +619,166 @@ CURLcode Curl_GetFTPResponse(ssize_t *nreadp, /* return number of bytes read */ return result; } -/* - * Curl_ftp_connect() should do everything that is to be considered a part of - * the connection phase. - */ -CURLcode Curl_ftp_connect(struct connectdata *conn) +/* This is the ONLY way to change FTP state! */ +static void state(struct connectdata *conn, + ftpstate state) { - /* this is FTP and no proxy */ - ssize_t nread; - struct SessionHandle *data=conn->data; - char *buf = data->state.buffer; /* this is our buffer */ - struct FTP *ftp; - CURLcode result; - int ftpcode, trynum; - static const char * const ftpauth[] = { - "SSL", "TLS", NULL +#ifdef CURLDEBUG + /* for debug purposes */ + const char *names[]={ + "STOP", + "WAIT220", + "AUTH", + "USER", + "PASS", + "ACCT", + "PBSZ", + "PROT", + "PWD", + "QUOTE", + "RETR_PREQUOTE", + "STOR_PREQUOTE", + "POSTQUOTE", + "CWD", + "MKD", + "MDTM", + "TYPE", + "LIST_TYPE", + "RETR_TYPE", + "STOR_TYPE", + "SIZE", + "RETR_SIZE", + "STOR_SIZE", + "REST", + "RETR_REST", + "PORT", + "PASV", + "LIST", + "RETR", + "STOR", + "QUIT" }; - - ftp = (struct FTP *)calloc(sizeof(struct FTP), 1); - if(!ftp) - return CURLE_OUT_OF_MEMORY; - - conn->proto.ftp = ftp; - - /* We always support persistant connections on ftp */ - conn->bits.close = FALSE; - - /* get some initial data into the ftp struct */ - ftp->bytecountp = &conn->bytecount; - - /* no need to duplicate them, this connectdata struct won't change */ - ftp->user = conn->user; - ftp->passwd = conn->passwd; - if (isBadFtpString(ftp->user) || isBadFtpString(ftp->passwd)) { - return CURLE_URL_MALFORMAT; - } - ftp->response_time = 3600; /* set default response time-out */ - -#ifndef CURL_DISABLE_HTTP - if (conn->bits.tunnel_proxy) { - /* We want "seamless" FTP operations through HTTP proxy tunnel */ - result = Curl_ConnectHTTPProxyTunnel(conn, FIRSTSOCKET, - conn->host.name, conn->remote_port); - if(CURLE_OK != result) - return result; - } -#endif /* CURL_DISABLE_HTTP */ - - if(conn->protocol & PROT_FTPS) { - /* FTPS is simply ftp with SSL for the control channel */ - /* now, perform the SSL initialization for this socket */ - result = Curl_SSLConnect(conn, FIRSTSOCKET); - if(result) - return result; - } - - /* The first thing we do is wait for the "220*" line: */ - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; - - if(ftpcode != 220) { - failf(data, "This doesn't seem like a nice ftp-server response"); - return CURLE_FTP_WEIRD_SERVER_REPLY; - } - -#ifdef HAVE_KRB4 - /* if not anonymous login, try a secure login */ - if(data->set.krb4) { - - /* request data protection level (default is 'clear') */ - Curl_sec_request_prot(conn, "private"); - - /* We set private first as default, in case the line below fails to - set a valid level */ - Curl_sec_request_prot(conn, data->set.krb4_level); - - if(Curl_sec_login(conn) != 0) - infof(data, "Logging in with password in cleartext!\n"); - else - infof(data, "Authentication successful\n"); - } -#endif - - if(data->set.ftp_ssl && !conn->ssl[FIRSTSOCKET].use) { - /* we don't have a SSL/TLS connection, try a FTPS connection now */ - int start; - int trynext; - int count=0; - - switch(data->set.ftpsslauth) { - case CURLFTPAUTH_DEFAULT: - case CURLFTPAUTH_SSL: - start = 0; - trynext = 1; - break; - case CURLFTPAUTH_TLS: - start = 1; - trynext = 0; - break; - default: - failf(data, "unsupported parameter to CURLOPT_FTPSSLAUTH: %d\n", - data->set.ftpsslauth); - return CURLE_FAILED_INIT; /* we don't know what to do */ - } - - for (trynum = start; ftpauth[count]; trynum=trynext, count++) { - - FTPSENDF(conn, "AUTH %s", ftpauth[trynum]); - - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - - if(result) - return result; - - /* RFC2228 (page 5) says: - * - * If the server is willing to accept the named security mechanism, and - * does not require any security data, it must respond with reply code - * 234/334. - */ - - if((ftpcode == 234) || (ftpcode == 334)) { - result = Curl_SSLConnect(conn, FIRSTSOCKET); - if(result) - return result; - conn->protocol |= PROT_FTPS; - conn->ssl[SECONDARYSOCKET].use = FALSE; /* clear-text data */ - break; - } - } - } - - /* send USER */ - FTPSENDF(conn, "USER %s", ftp->user?ftp->user:""); - - /* wait for feedback */ - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; - - if(ftpcode == 530) { - /* 530 User ... access denied - (the server denies to log the specified user) */ - failf(data, "Access denied: %03d", ftpcode); - return CURLE_FTP_ACCESS_DENIED; - } - else if(ftpcode == 331) { - /* 331 Password required for ... - (the server requires to send the user's password too) */ - FTPSENDF(conn, "PASS %s", ftp->passwd?ftp->passwd:""); - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; - - if(ftpcode == 530) { - /* 530 Login incorrect. - (the username and/or the password are incorrect) - or - 530 Sorry, the maximum number of allowed users are already connected - */ - failf(data, "not logged in: %03d", ftpcode); - return CURLE_FTP_USER_PASSWORD_INCORRECT; - } - else if(ftpcode/100 == 2) { - /* 230 User ... logged in. - (user successfully logged in) - - Apparently, proftpd with SSL returns 232 here at times. */ - - infof(data, "We have successfully logged in\n"); - } - else if(ftpcode == 332) { - /* 332 Please provide account info */ - if(data->set.ftp_account) { - FTPSENDF(conn, "ACCT %s", data->set.ftp_account); - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(!result && (ftpcode != 230)) { - failf(data, "ACCT rejected by server: %03d", ftpcode); - result = CURLE_FTP_WEIRD_PASS_REPLY; /* FIX */ - } - } - else { - failf(data, "ACCT requested by none available"); - result = CURLE_FTP_WEIRD_PASS_REPLY; - } - if(result) - return result; - } - else { - failf(data, "Odd return code after PASS"); - return CURLE_FTP_WEIRD_PASS_REPLY; - } - } - else if(buf[0] == '2') { - /* 230 User ... logged in. - (the user logged in without password) */ - infof(data, "We have successfully logged in\n"); - if (conn->ssl[FIRSTSOCKET].use) { -#ifdef HAVE_KRB4 - /* We are logged in with Kerberos, now set the requested protection - * level - */ - if(conn->sec_complete) - Curl_sec_set_protection_level(conn); - - /* We may need to issue a KAUTH here to have access to the files - * do it if user supplied a password - */ - if(conn->passwd && *conn->passwd) { - result = Curl_krb_kauth(conn); - if(result) - return result; - } #endif - } - } - else { - failf(data, "Odd return code after USER"); - return CURLE_FTP_WEIRD_USER_REPLY; - } - - if(conn->ssl[FIRSTSOCKET].use) { - /* PBSZ = PROTECTION BUFFER SIZE. - - The 'draft-murray-auth-ftp-ssl' (draft 12, page 7) says: - - Specifically, the PROT command MUST be preceded by a PBSZ command - and a PBSZ command MUST be preceded by a successful security data - exchange (the TLS negotiation in this case) - - ... (and on page 8): - - Thus the PBSZ command must still be issued, but must have a parameter - of '0' to indicate that no buffering is taking place and the data - connection should not be encapsulated. - */ - FTPSENDF(conn, "PBSZ %d", 0); - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; - - /* For TLS, the data connection can have one of two security levels. - - 1)Clear (requested by 'PROT C') - - 2)Private (requested by 'PROT P') - */ - if(!conn->ssl[SECONDARYSOCKET].use) { - FTPSENDF(conn, "PROT %c", 'P'); - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; - - if(ftpcode/100 == 2) - /* We have enabled SSL for the data connection! */ - conn->ssl[SECONDARYSOCKET].use = TRUE; - /* FTP servers typically responds with 500 if they decide to reject - our 'P' request */ - else if(data->set.ftp_ssl> CURLFTPSSL_CONTROL) - /* we failed and bails out */ - return CURLE_FTP_SSL_FAILED; - } - } - - /* send PWD to discover our entry point */ - FTPSENDF(conn, "PWD", NULL); - - /* wait for feedback */ - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; - - if(ftpcode == 257) { - char *dir = (char *)malloc(nread+1); - char *store=dir; - char *ptr=&buf[4]; /* start on the first letter */ - - if(!dir) - return CURLE_OUT_OF_MEMORY; - - /* Reply format is like - 257<space>"<directory-name>"<space><commentary> and the RFC959 says - - The directory name can contain any character; embedded double-quotes - should be escaped by double-quotes (the "quote-doubling" convention). - */ - if('\"' == *ptr) { - /* it started good */ - ptr++; - while(ptr && *ptr) { - if('\"' == *ptr) { - if('\"' == ptr[1]) { - /* "quote-doubling" */ - *store = ptr[1]; - ptr++; - } - else { - /* end of path */ - *store = '\0'; /* zero terminate */ - break; /* get out of this loop */ - } - } - else - *store = *ptr; - store++; - ptr++; - } - ftp->entrypath =dir; /* remember this */ - infof(data, "Entry path is '%s'\n", ftp->entrypath); - } - else { - /* couldn't get the path */ - free(dir); - infof(data, "Failed to figure out path\n"); - } - - } - else { - /* We couldn't read the PWD response! */ - } - - return CURLE_OK; -} - -/*********************************************************************** - * - * Curl_ftp_done() - * - * The DONE function. This does what needs to be done after a single DO has - * performed. - * - * Input argument is already checked for validity. - */ -CURLcode Curl_ftp_done(struct connectdata *conn, CURLcode status) -{ - struct SessionHandle *data = conn->data; struct FTP *ftp = conn->proto.ftp; - ssize_t nread; - int ftpcode; - CURLcode result=CURLE_OK; - bool was_ctl_valid = ftp->ctl_valid; - size_t flen; - size_t dlen; - char *path; - - /* now store a copy of the directory we are in */ - if(ftp->prevpath) - free(ftp->prevpath); - - path = curl_unescape(conn->path, 0); /* get the "raw" path */ - if(!path) - return CURLE_OUT_OF_MEMORY; - - flen = ftp->file?strlen(ftp->file):0; /* file is "raw" already */ - dlen = strlen(path)-flen; - if(dlen) { - ftp->prevpath = path; - if(flen) - /* if 'path' is not the whole string */ - ftp->prevpath[dlen]=0; /* terminate */ - infof(data, "Remembering we are in dir %s\n", ftp->prevpath); - } - else { - ftp->prevpath = NULL; /* no path */ - free(path); - } - /* free the dir tree and file parts */ - freedirs(ftp); - - ftp->ctl_valid = FALSE; - - if(data->set.upload) { - if((-1 != data->set.infilesize) && - (data->set.infilesize != *ftp->bytecountp) && - !data->set.crlf) { - failf(data, "Uploaded unaligned file size (%" FORMAT_OFF_T - " out of %" FORMAT_OFF_T " bytes)", - *ftp->bytecountp, data->set.infilesize); - conn->bits.close = TRUE; /* close this connection since we don't - know what state this error leaves us in */ - return CURLE_PARTIAL_FILE; - } - } - else { - if((-1 != conn->size) && (conn->size != *ftp->bytecountp) && - (conn->maxdownload != *ftp->bytecountp)) { - failf(data, "Received only partial file: %" FORMAT_OFF_T " bytes", - *ftp->bytecountp); - conn->bits.close = TRUE; /* close this connection since we don't - know what state this error leaves us in */ - return CURLE_PARTIAL_FILE; - } - else if(!ftp->dont_check && - !*ftp->bytecountp && - (conn->size>0)) { - /* We consider this an error, but there's no true FTP error received - why we need to continue to "read out" the server response too. - We don't want to leave a "waiting" server reply if we'll get told - to make a second request on this same connection! */ - failf(data, "No data was received!"); - result = CURLE_FTP_COULDNT_RETR_FILE; - } - } - - switch(status) { - case CURLE_BAD_DOWNLOAD_RESUME: - case CURLE_FTP_WEIRD_PASV_REPLY: - case CURLE_FTP_PORT_FAILED: - case CURLE_FTP_COULDNT_SET_BINARY: - case CURLE_FTP_COULDNT_RETR_FILE: - case CURLE_FTP_ACCESS_DENIED: - /* the connection stays alive fine even though this happened */ - /* fall-through */ - case CURLE_OK: /* doesn't affect the control connection's status */ - ftp->ctl_valid = was_ctl_valid; - break; - default: /* by default, an error means the control connection is - wedged and should not be used anymore */ - ftp->ctl_valid = FALSE; - break; - } - -#ifdef HAVE_KRB4 - Curl_sec_fflush_fd(conn, conn->sock[SECONDARYSOCKET]); -#endif - - /* shut down the socket to inform the server we're done */ - -#ifdef _WIN32_WCE - shutdown(conn->sock[SECONDARYSOCKET],2); /* SD_BOTH */ +#ifdef CURLDEBUG + if(ftp->state != state) + infof(conn->data, "FTP %p state change from %s to %s\n", + ftp, names[ftp->state], names[state]); #endif - - sclose(conn->sock[SECONDARYSOCKET]); - - conn->sock[SECONDARYSOCKET] = CURL_SOCKET_BAD; - - if(!ftp->no_transfer && !status) { - /* Let's see what the server says about the transfer we just performed, - * but lower the timeout as sometimes this connection has died while the - * data has been transfered. This happens when doing through NATs etc that - * abandon old silent connections. - */ - ftp->response_time = 60; /* give it only a minute for now */ - - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - - ftp->response_time = 3600; /* set this back to one hour waits */ - - if(!nread && (CURLE_OPERATION_TIMEDOUT == result)) { - failf(data, "control connection looks dead"); - return result; - } - - if(result) - return result; - - if(!ftp->dont_check) { - /* 226 Transfer complete, 250 Requested file action okay, completed. */ - if((ftpcode != 226) && (ftpcode != 250)) { - failf(data, "server did not report OK, got %d", ftpcode); - return CURLE_FTP_WRITE_ERROR; - } - } - } - - /* clear these for next connection */ - ftp->no_transfer = FALSE; - ftp->dont_check = FALSE; - - if (!result && conn->sec_conn) { /* 3rd party transfer */ - /* "done" with the secondary connection */ - result = Curl_ftp_done(conn->sec_conn, status); - } - - /* Send any post-transfer QUOTE strings? */ - if(!status && !result && data->set.postquote) - result = ftp_sendquote(conn, data->set.postquote); - - return result; + ftp->state = state; } -/*********************************************************************** - * - * ftp_sendquote() - * - * Where a 'quote' means a list of custom commands to send to the server. - * The quote list is passed as an argument. - */ - -static -CURLcode ftp_sendquote(struct connectdata *conn, struct curl_slist *quote) +static CURLcode ftp_state_user(struct connectdata *conn) { - struct curl_slist *item; - ssize_t nread; - int ftpcode; CURLcode result; + struct FTP *ftp = conn->proto.ftp; + /* send USER */ + NBFTPSENDF(conn, "USER %s", ftp->user?ftp->user:""); - item = quote; - while (item) { - if (item->data) { - FTPSENDF(conn, "%s", item->data); - - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if (result) - return result; - - if (ftpcode >= 400) { - failf(conn->data, "QUOT string not accepted: %s", item->data); - return CURLE_FTP_QUOTE_ERROR; - } - } - - item = item->next; - } + state(conn, FTP_USER); return CURLE_OK; } -/*********************************************************************** - * - * ftp_getfiletime() - * - * Get the timestamp of the given file. - */ -static -CURLcode ftp_getfiletime(struct connectdata *conn, char *file) +static CURLcode ftp_state_pwd(struct connectdata *conn) { - CURLcode result=CURLE_OK; - int ftpcode; /* for ftp status */ - ssize_t nread; - char *buf = conn->data->state.buffer; - - /* we have requested to get the modified-time of the file, this is yet - again a grey area as the MDTM is not kosher RFC959 */ - FTPSENDF(conn, "MDTM %s", file); + CURLcode result; - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; + /* send PWD to discover our entry point */ + NBFTPSENDF(conn, "PWD", NULL); + state(conn, FTP_PWD); - switch(ftpcode) { - case 213: - { - /* we got a time. Format should be: "YYYYMMDDHHMMSS[.sss]" where the - last .sss part is optional and means fractions of a second */ - int year, month, day, hour, minute, second; - if(6 == sscanf(buf+4, "%04d%02d%02d%02d%02d%02d", - &year, &month, &day, &hour, &minute, &second)) { - /* we have a time, reformat it */ - time_t secs=time(NULL); - /* using the good old yacc/bison yuck */ - snprintf(buf, sizeof(conn->data->state.buffer), - "%04d%02d%02d %02d:%02d:%02d GMT", - year, month, day, hour, minute, second); - /* now, convert this into a time() value: */ - conn->data->info.filetime = curl_getdate(buf, &secs); - } - } - break; - default: - infof(conn->data, "unsupported MDTM reply format\n"); - break; - case 550: /* "No such file or directory" */ - failf(conn->data, "Given file does not exist"); - result = CURLE_FTP_COULDNT_RETR_FILE; - break; - } - return result; + return CURLE_OK; } -/*********************************************************************** - * - * ftp_transfertype() - * - * Set transfer type. We only deal with ASCII or BINARY so this function - * sets one of them. - */ -static CURLcode ftp_transfertype(struct connectdata *conn, - bool ascii) +/* For the FTP "protocol connect" and "doing" phases only */ +CURLcode Curl_ftp_fdset(struct connectdata *conn, + fd_set *read_fd_set, + fd_set *write_fd_set, + int *max_fdp) { - struct SessionHandle *data = conn->data; - int ftpcode; - ssize_t nread; - CURLcode result; - - FTPSENDF(conn, "TYPE %s", ascii?"A":"I"); + struct FTP *ftp = conn->proto.ftp; + curl_socket_t sockfd = conn->sock[FIRSTSOCKET]; - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; + if(ftp->sendleft) + /* write mode */ + FD_SET(sockfd, write_fd_set); + else + /* read mode */ + FD_SET(sockfd, read_fd_set); - if(ftpcode != 200) { - failf(data, "Couldn't set %s mode", - ascii?"ASCII":"binary"); - return ascii? CURLE_FTP_COULDNT_SET_ASCII:CURLE_FTP_COULDNT_SET_BINARY; - } + if((int)sockfd > *max_fdp) + *max_fdp = (int)sockfd; return CURLE_OK; } -/*********************************************************************** - * - * ftp_getsize() - * - * Returns the file size (in bytes) of the given remote file. - */ +/* This is called after the FTP_QUOTE state is passed. -static -CURLcode ftp_getsize(struct connectdata *conn, char *file, - curl_off_t *size) + ftp_state_cwd() sends the range of PWD commands to the server to change to + the correct directory. It may also need to send MKD commands to create + missing ones, if that option is enabled. +*/ +static CURLcode ftp_state_cwd(struct connectdata *conn) { - struct SessionHandle *data = conn->data; - int ftpcode; - ssize_t nread; - char *buf=data->state.buffer; - CURLcode result; - - FTPSENDF(conn, "SIZE %s", file); - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; - if(ftpcode == 213) { - /* get the size from the ascii string: */ - *size = curlx_strtoofft(buf+4, NULL, 0); + if(ftp->cwddone) + /* already done and fine */ + result = ftp_state_post_cwd(conn); + else { + ftp->count2 = 0; + if (conn->bits.reuse && ftp->entrypath) { + /* This is a re-used connection. Since we change directory to where the + transfer is taking place, we must first get back to the original dir + where we ended up after login: */ + ftp->count1 = 0; /* we count this as the first path, then we add one + for all upcoming ones in the ftp->dirs[] array */ + NBFTPSENDF(conn, "CWD %s", ftp->entrypath); + state(conn, FTP_CWD); + } + else { + if(ftp->dirdepth) { + ftp->count1 = 1; + /* issue the first CWD, the rest is sent when the CWD responses are + received... */ + NBFTPSENDF(conn, "CWD %s", ftp->dirs[ftp->count1 -1]); + state(conn, FTP_CWD); + } + else { + /* No CWD necessary */ + result = ftp_state_post_cwd(conn); + } + } } - else - return CURLE_FTP_COULDNT_GET_SIZE; - - return CURLE_OK; + return result; } -/*************************************************************************** - * - * ftp_pasv_verbose() - * - * This function only outputs some informationals about this second connection - * when we've issued a PASV command before and thus we have connected to a - * possibly new IP address. - * - */ -static void -ftp_pasv_verbose(struct connectdata *conn, - Curl_addrinfo *ai, - char *newhost, /* ascii version */ - int port) -{ - char buf[256]; - Curl_printable_address(ai, buf, sizeof(buf)); - infof(conn->data, "Connecting to %s (%s) port %d\n", newhost, buf, port); -} +typedef enum { EPRT, LPRT, PORT, DONE } ftpport; -/*********************************************************************** - * - * ftp_use_port() - * - * Send the proper PORT command. PORT is the ftp client's way of telling the - * server that *WE* open a port that we listen on an awaits the server to - * connect to. This is the opposite of PASV. - */ +static CURLcode ftp_state_use_port(struct connectdata *conn, + ftpport fcmd) /* start with this */ -static -CURLcode ftp_use_port(struct connectdata *conn) { + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; struct SessionHandle *data=conn->data; curl_socket_t portsock= CURL_SOCKET_BAD; - ssize_t nread; - int ftpcode; /* receive FTP response codes in this */ - CURLcode result; #ifdef ENABLE_IPV6 /****************************************************************** - * - * Here's a piece of IPv6-specific code coming up - * + * IPv6-specific section */ struct addrinfo *res, *ai; struct sockaddr_storage ss; socklen_t sslen; - char hbuf[NI_MAXHOST]=""; + char hbuf[NI_MAXHOST]; struct sockaddr *sa=(struct sockaddr *)&ss; unsigned char *ap; unsigned char *pp; char portmsgbuf[1024], tmp[1024]; - enum ftpcommand { EPRT, LPRT, PORT, DONE } fcmd; const char *mode[] = { "EPRT", "LPRT", "PORT", NULL }; int rc; int error; @@ -1197,6 +840,7 @@ CURLcode ftp_use_port(struct connectdata *conn) error = Curl_ourerrno(); continue; } + if (bind(portsock, ai->ai_addr, ai->ai_addrlen) < 0) { error = Curl_ourerrno(); sclose(portsock); @@ -1232,7 +876,7 @@ CURLcode ftp_use_port(struct connectdata *conn) conn->bits.ftp_use_eprt = TRUE; #endif - for (fcmd = EPRT; fcmd != DONE; fcmd++) { + for (; fcmd != DONE; fcmd++) { int lprtaf, eprtaf; int alen=0, plen=0; @@ -1282,10 +926,11 @@ CURLcode ftp_use_port(struct connectdata *conn) *q = '\0'; } - result = Curl_ftpsendf(conn, "%s |%d|%s|%s|", mode[fcmd], eprtaf, - portmsgbuf, tmp); + result = Curl_nbftpsendf(conn, "%s |%d|%s|%s|", mode[fcmd], eprtaf, + portmsgbuf, tmp); if(result) return result; + break; } else if ((LPRT == fcmd) || (PORT == fcmd)) { int i; @@ -1332,45 +977,26 @@ CURLcode ftp_use_port(struct connectdata *conn) } } - result = Curl_ftpsendf(conn, "%s %s", mode[fcmd], portmsgbuf); + result = Curl_nbftpsendf(conn, "%s %s", mode[fcmd], portmsgbuf); if(result) return result; - } - - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; - - if (ftpcode != 200) { - if (EPRT == fcmd) { - infof(data, "disabling EPRT usage\n"); - conn->bits.ftp_use_eprt = FALSE; - } - else if (LPRT == fcmd) { - infof(data, "disabling LPRT usage\n"); - conn->bits.ftp_use_lprt = FALSE; - } - continue; - } - else break; + } } - if (fcmd == DONE) { - sclose(portsock); - failf(data, "PORT command attempts failed"); - return CURLE_FTP_PORT_FAILED; - } - /* we set the secondary socket variable to this for now, it - is only so that the cleanup function will close it in case - we fail before the true secondary stuff is made */ + /* store which command was sent */ + ftp->count1 = fcmd; + + /* we set the secondary socket variable to this for now, it is only so that + the cleanup function will close it in case we fail before the true + secondary stuff is made */ + if(-1 != conn->sock[SECONDARYSOCKET]) + sclose(conn->sock[SECONDARYSOCKET]); conn->sock[SECONDARYSOCKET] = portsock; #else /****************************************************************** - * - * Here's a piece of IPv4-specific code coming up - * + * IPv4-specific section */ struct sockaddr_in sa; unsigned short porttouse; @@ -1378,7 +1004,7 @@ CURLcode ftp_use_port(struct connectdata *conn) bool sa_filled_in = FALSE; Curl_addrinfo *addr = NULL; unsigned short ip[4]; - + (void)fcmd; /* not used in the IPv4 code */ if(data->set.ftpport) { in_addr_t in; @@ -1399,11 +1025,12 @@ CURLcode ftp_use_port(struct connectdata *conn) struct Curl_dns_entry *h=NULL; int rc = Curl_resolv(conn, myhost, 0, &h); if(rc == CURLRESOLV_PENDING) + /* BLOCKING */ rc = Curl_wait_for_resolv(conn, &h); if(h) { addr = h->addr; /* when we return from this function, we can forget about this entry - to we can unlock it now already */ + so we can unlock it now already */ Curl_resolv_unlock(data, h); } /* (h) */ } /* strlen */ @@ -1433,6 +1060,8 @@ CURLcode ftp_use_port(struct connectdata *conn) /* we set the secondary socket variable to this for now, it is only so that the cleanup function will close it in case we fail before the true secondary stuff is made */ + if(-1 != conn->sock[SECONDARYSOCKET]) + sclose(conn->sock[SECONDARYSOCKET]); conn->sock[SECONDARYSOCKET] = portsock; if(!sa_filled_in) { @@ -1487,54 +1116,29 @@ CURLcode ftp_use_port(struct connectdata *conn) infof(data, "Telling server to connect to %d.%d.%d.%d:%d\n", ip[0], ip[1], ip[2], ip[3], porttouse); - result=Curl_ftpsendf(conn, "PORT %d,%d,%d,%d,%d,%d", - ip[0], ip[1], ip[2], ip[3], - porttouse >> 8, - porttouse & 255); + result=Curl_nbftpsendf(conn, "PORT %d,%d,%d,%d,%d,%d", + ip[0], ip[1], ip[2], ip[3], + porttouse >> 8, porttouse & 255); if(result) return result; - } else return CURLE_FTP_PORT_FAILED; Curl_freeaddrinfo(addr); - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; + ftp->count1 = PORT; - if(ftpcode != 200) { - failf(data, "Server does not grok PORT, try without it!"); - return CURLE_FTP_PORT_FAILED; - } #endif /* end of ipv4-specific code */ - return CURLE_OK; + state(conn, FTP_PORT); + return result; } -/*********************************************************************** - * - * ftp_use_pasv() - * - * Send the PASV command. PASV is the ftp client's way of asking the server to - * open a second port that we can connect to (for the data transfer). This is - * the opposite of PORT. - */ - -static -CURLcode ftp_use_pasv(struct connectdata *conn, - bool *connected) +static CURLcode ftp_state_use_pasv(struct connectdata *conn) { - struct SessionHandle *data = conn->data; - ssize_t nread; - char *buf = data->state.buffer; /* this is our buffer */ - int ftpcode; /* receive FTP response codes in this */ - CURLcode result; - struct Curl_dns_entry *addr=NULL; - Curl_addrinfo *conninfo; - int rc; - + struct FTP *ftp = conn->proto.ftp; + CURLcode result = CURLE_OK; /* Here's the excecutive summary on what to do: @@ -1550,15 +1154,7 @@ CURLcode ftp_use_pasv(struct connectdata *conn, */ const char *mode[] = { "EPSV", "PASV", NULL }; - int results[] = { 229, 227, 0 }; int modeoff; - unsigned short connectport; /* the local port connect() should use! */ - unsigned short newport=0; /* remote port, not necessary the local one */ - - /* newhost must be able to hold a full IP-style address in ASCII, which - in the IPv6 case means 5*8-1 = 39 letters */ -#define NEWHOST_BUFSIZE 48 - char newhost[NEWHOST_BUFSIZE]; #ifdef PF_INET6 if(!conn->bits.ftp_use_epsv && conn->bits.ipv6) @@ -1567,63 +1163,353 @@ CURLcode ftp_use_pasv(struct connectdata *conn, conn->bits.ftp_use_epsv = TRUE; #endif - for (modeoff = (conn->bits.ftp_use_epsv?0:1); - mode[modeoff]; modeoff++) { - result = Curl_ftpsendf(conn, "%s", mode[modeoff]); - if(result) - return result; - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; - if (ftpcode == results[modeoff]) - break; + modeoff = conn->bits.ftp_use_epsv?0:1; - if(modeoff == 0) { - /* EPSV is not supported, disable it for next transfer */ - conn->bits.ftp_use_epsv = FALSE; - infof(data, "disabling EPSV usage\n"); - } + result = Curl_nbftpsendf(conn, "%s", mode[modeoff]); + if(result) + return result; + + ftp->count1 = modeoff; + state(conn, FTP_PASV); + infof(conn->data, "Connect data stream passively\n"); + + return result; +} + +/* REST is the last command in the chain of commands when a "head"-like + request is made. Thus, if an actual transfer is to be made this is where + we take off for real. */ +static CURLcode ftp_state_post_rest(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + struct SessionHandle *data = conn->data; + + if(ftp->no_transfer || conn->bits.no_body) { + /* then we're done with a "head"-like request, goto STOP */ + state(conn, FTP_STOP); + + /* doesn't transfer any data */ + ftp->no_transfer = TRUE; + } + else if(data->set.ftp_use_port) { + /* We have chosen to use the PORT (or similar) command */ + result = ftp_state_use_port(conn, EPRT); + } + else { + /* We have chosen (this is default) to use the PASV (or similar) command */ + result = ftp_state_use_pasv(conn); } + return result; +} - if (!mode[modeoff]) { - failf(data, "Odd return code after PASV"); - return CURLE_FTP_WEIRD_PASV_REPLY; +static CURLcode ftp_state_post_size(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + + if(ftp->no_transfer) { + /* if a "head"-like request is being made */ + + /* Determine if server can respond to REST command and therefore + whether it supports range */ + NBFTPSENDF(conn, "REST %d", 0); + + state(conn, FTP_REST); } - else if (227 == results[modeoff]) { - int ip[4]; - int port[2]; - char *str=buf; + else + result = ftp_state_post_rest(conn); - /* - * New 227-parser June 3rd 1999. - * It now scans for a sequence of six comma-separated numbers and - * will take them as IP+port indicators. - * - * Found reply-strings include: - * "227 Entering Passive Mode (127,0,0,1,4,51)" - * "227 Data transfer will passively listen to 127,0,0,1,4,51" - * "227 Entering passive mode. 127,0,0,1,4,51" - */ + return result; +} - while(*str) { - if (6 == sscanf(str, "%d,%d,%d,%d,%d,%d", - &ip[0], &ip[1], &ip[2], &ip[3], - &port[0], &port[1])) - break; - str++; +static CURLcode ftp_state_post_type(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + + if(ftp->no_transfer) { + /* if a "head"-like request is being made */ + + /* we know ftp->file is a valid pointer to a file name */ + NBFTPSENDF(conn, "SIZE %s", ftp->file); + + state(conn, FTP_SIZE); + } + else + result = ftp_state_post_size(conn); + + return result; +} + +static CURLcode ftp_state_post_listtype(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + + /* If this output is to be machine-parsed, the NLST command might be better + to use, since the LIST command output is not specified or standard in any + way. It has turned out that the NLST list output is not the same on all + servers either... */ + + NBFTPSENDF(conn, "%s", + data->set.customrequest?data->set.customrequest: + (data->set.ftp_list_only?"NLST":"LIST")); + + state(conn, FTP_LIST); + + return result; +} + +static CURLcode ftp_state_post_retrtype(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + + /* We've sent the TYPE, now we must send the list of prequote strings */ + + result = ftp_state_quote(conn, TRUE, FTP_RETR_PREQUOTE); + + return result; +} + +static CURLcode ftp_state_post_stortype(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + + /* We've sent the TYPE, now we must send the list of prequote strings */ + + result = ftp_state_quote(conn, TRUE, FTP_STOR_PREQUOTE); + + return result; +} + +static CURLcode ftp_state_post_mdtm(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + struct SessionHandle *data = conn->data; + + /* If we have selected NOBODY and HEADER, it means that we only want file + information. Which in FTP can't be much more than the file size and + date. */ + if(conn->bits.no_body && data->set.include_header && ftp->file) { + /* The SIZE command is _not_ RFC 959 specified, and therefor many servers + may not support it! It is however the only way we have to get a file's + size! */ + + ftp->no_transfer = TRUE; /* this means no actual transfer will be made */ + + /* Some servers return different sizes for different modes, and thus we + must set the proper type before we check the size */ + NBFTPSENDF(conn, "TYPE %c", + data->set.ftp_ascii?'A':'I'); + state(conn, FTP_TYPE); + } + else + result = ftp_state_post_type(conn); + + return result; +} + +/* This is called after the CWD commands have been done in the beginning of + the DO phase */ +static CURLcode ftp_state_post_cwd(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + struct SessionHandle *data = conn->data; + + /* Requested time of file or time-depended transfer? */ + if((data->set.get_filetime || data->set.timecondition) && ftp->file) { + + /* we have requested to get the modified-time of the file, this is a white + spot as the MDTM is not mentioned in RFC959 */ + NBFTPSENDF(conn, "MDTM %s", ftp->file); + + state(conn, FTP_MDTM); + } + else + result = ftp_state_post_mdtm(conn); + + return result; +} + + +/* This is called after the TYPE and possible quote commands have been sent */ +static CURLcode ftp_state_ul_setup(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + struct SessionHandle *data = conn->data; + curl_off_t passed=0; + + if(conn->resume_from) { + /* we're about to continue the uploading of a file */ + /* 1. get already existing file's size. We use the SIZE command for this + which may not exist in the server! The SIZE command is not in + RFC959. */ + + /* 2. This used to set REST. But since we can do append, we + don't another ftp command. We just skip the source file + offset and then we APPEND the rest on the file instead */ + + /* 3. pass file-size number of bytes in the source file */ + /* 4. lower the infilesize counter */ + /* => transfer as usual */ + + if(conn->resume_from < 0 ) { + /* Got no given size to start from, figure it out */ + NBFTPSENDF(conn, "SIZE %s", ftp->file); + state(conn, FTP_STOR_SIZE); + return result; } - if(!*str) { - failf(data, "Couldn't interpret the 227-reply"); - return CURLE_FTP_WEIRD_227_FORMAT; + /* enable append */ + data->set.ftp_append = TRUE; + + /* Let's read off the proper amount of bytes from the input. If we knew it + was a proper file we could've just fseek()ed but we only have a stream + here */ + + /* TODO: allow the ioctlfunction to provide a fast forward function that + can be used here and use this method only as a fallback! */ + do { + curl_off_t readthisamountnow = (conn->resume_from - passed); + curl_off_t actuallyread; + + if(readthisamountnow > BUFSIZE) + readthisamountnow = BUFSIZE; + + actuallyread = (curl_off_t) + conn->fread(data->state.buffer, 1, (size_t)readthisamountnow, + conn->fread_in); + + passed += actuallyread; + if(actuallyread != readthisamountnow) { + failf(data, "Could only read %" FORMAT_OFF_T + " bytes from the input", passed); + return CURLE_FTP_COULDNT_USE_REST; + } + } while(passed != conn->resume_from); + + /* now, decrease the size of the read */ + if(data->set.infilesize>0) { + data->set.infilesize -= conn->resume_from; + + if(data->set.infilesize <= 0) { + infof(data, "File already completely uploaded\n"); + + /* no data to transfer */ + result=Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL); + + /* Set no_transfer so that we won't get any error in + * Curl_ftp_done() because we didn't transfer anything! */ + ftp->no_transfer = TRUE; + + state(conn, FTP_STOP); + return CURLE_OK; + } } + /* we've passed, proceed as normal */ + } /* resume_from */ - snprintf(newhost, sizeof(newhost), - "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]); - newport = (port[0]<<8) + port[1]; + NBFTPSENDF(conn, data->set.ftp_append?"APPE %s":"STOR %s", + ftp->file); + + state(conn, FTP_STOR); + + return result; +} + +static CURLcode ftp_state_quote(struct connectdata *conn, + bool init, + ftpstate instate) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + struct SessionHandle *data = conn->data; + bool quote=FALSE; + struct curl_slist *item; + + switch(instate) { + case FTP_QUOTE: + default: + item = data->set.quote; + break; + case FTP_RETR_PREQUOTE: + case FTP_STOR_PREQUOTE: + item = data->set.prequote; + break; + case FTP_POSTQUOTE: + item = data->set.postquote; + break; + } + + if(init) + ftp->count1 = 0; + else + ftp->count1++; + + if(item) { + int i = 0; + + /* Skip count1 items in the linked list */ + while((i< ftp->count1) && item) { + item = item->next; + i++; + } + if(item) { + NBFTPSENDF(conn, "%s", item->data); + state(conn, instate); + quote = TRUE; + } + } + + if(!quote) { + /* No more quote to send, continue to ... */ + switch(instate) { + case FTP_QUOTE: + default: + result = ftp_state_cwd(conn); + break; + case FTP_RETR_PREQUOTE: + NBFTPSENDF(conn, "SIZE %s", ftp->file); + state(conn, FTP_RETR_SIZE); + break; + case FTP_STOR_PREQUOTE: + result = ftp_state_ul_setup(conn); + break; + case FTP_POSTQUOTE: + break; + } } - else if (229 == results[modeoff]) { - char *ptr = strchr(buf, '('); + + return result; +} + +static CURLcode ftp_state_pasv_resp(struct connectdata *conn, + int ftpcode) +{ + struct FTP *ftp = conn->proto.ftp; + CURLcode result; + struct SessionHandle *data=conn->data; + Curl_addrinfo *conninfo; + struct Curl_dns_entry *addr=NULL; + int rc; + unsigned short connectport; /* the local port connect() should use! */ + unsigned short newport=0; /* remote port */ + bool connected; + + /* newhost must be able to hold a full IP-style address in ASCII, which + in the IPv6 case means 5*8-1 = 39 letters */ +#define NEWHOST_BUFSIZE 48 + char newhost[NEWHOST_BUFSIZE]; + char *str=&data->state.buffer[4]; /* start on the first letter */ + + if((ftp->count1 == 0) && + (ftpcode == 229)) { + /* positive EPSV response */ + char *ptr = strchr(str, '('); if(ptr) { unsigned int num; char separator[4]; @@ -1648,8 +1534,8 @@ CURLcode ftp_use_pasv(struct connectdata *conn, if(ptr) { newport = num; - /* We must use the same IP we are already connected to */ - snprintf(newhost, NEWHOST_BUFSIZE, "%s", conn->ip_addr_str); + /* use the same IP we are already connected to */ + snprintf(newhost, NEWHOST_BUFSIZE, "%s", conn->ip_addr_str, newhost); } } else @@ -1660,8 +1546,56 @@ CURLcode ftp_use_pasv(struct connectdata *conn, return CURLE_FTP_WEIRD_PASV_REPLY; } } - else - return CURLE_FTP_CANT_RECONNECT; + else if((ftp->count1 == 1) && + (ftpcode == 227)) { + /* positive PASV response */ + int ip[4]; + int port[2]; + + /* + * Scan for a sequence of six comma-separated numbers and use them as + * IP+port indicators. + * + * Found reply-strings include: + * "227 Entering Passive Mode (127,0,0,1,4,51)" + * "227 Data transfer will passively listen to 127,0,0,1,4,51" + * "227 Entering passive mode. 127,0,0,1,4,51" + */ + while(*str) { + if (6 == sscanf(str, "%d,%d,%d,%d,%d,%d", + &ip[0], &ip[1], &ip[2], &ip[3], + &port[0], &port[1])) + break; + str++; + } + + if(!*str) { + failf(data, "Couldn't interpret the 227-response"); + return CURLE_FTP_WEIRD_227_FORMAT; + } + + snprintf(newhost, sizeof(newhost), + "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]); + newport = (port[0]<<8) + port[1]; + } + else if(ftp->count1 == 0) { + /* EPSV failed, move on to PASV */ + + /* disable it for next transfer */ + conn->bits.ftp_use_epsv = FALSE; + infof(data, "disabling EPSV usage\n"); + + NBFTPSENDF(conn, "PASV", NULL); + ftp->count1++; + /* remain in the FTP_PASV state */ + return result; + } + else { + failf(data, "Bad PASV/EPSV response: %03d", ftpcode); + return CURLE_FTP_WEIRD_PASV_REPLY; + } + + /* we got OK from server */ if(data->change.proxy && *data->change.proxy) { /* @@ -1673,6 +1607,7 @@ CURLcode ftp_use_pasv(struct connectdata *conn, */ rc = Curl_resolv(conn, conn->proxy.name, (int)conn->port, &addr); if(rc == CURLRESOLV_PENDING) + /* BLOCKING */ rc = Curl_wait_for_resolv(conn, &addr); connectport = @@ -1683,6 +1618,7 @@ CURLcode ftp_use_pasv(struct connectdata *conn, /* normal, direct, ftp connection */ rc = Curl_resolv(conn, newhost, newport, &addr); if(rc == CURLRESOLV_PENDING) + /* BLOCKING */ rc = Curl_wait_for_resolv(conn, &addr); if(!addr) { @@ -1696,13 +1632,15 @@ CURLcode ftp_use_pasv(struct connectdata *conn, addr, &conn->sock[SECONDARYSOCKET], &conninfo, - connected); + &connected); Curl_resolv_unlock(data, addr); /* we're done using this address */ if(result) return result; + conn->bits.tcpconnect = connected; /* simply TRUE or FALSE */ + /* * When this is used from the multi interface, this might've returned with * the 'connected' set to FALSE and thus we are now awaiting a non-blocking @@ -1715,6 +1653,10 @@ CURLcode ftp_use_pasv(struct connectdata *conn, #ifndef CURL_DISABLE_HTTP if(conn->bits.tunnel_proxy) { + /* FIX: this MUST wait for a proper connect first if 'connected' is + * FALSE */ + + /* BLOCKING */ /* We want "seamless" FTP operations through HTTP proxy tunnel */ result = Curl_ConnectHTTPProxyTunnel(conn, SECONDARYSOCKET, newhost, newport); @@ -1723,138 +1665,435 @@ CURLcode ftp_use_pasv(struct connectdata *conn, } #endif /* CURL_DISABLE_HTTP */ - return CURLE_OK; -} + state(conn, FTP_STOP); /* this phase is completed */ -/* - * Curl_ftp_nextconnect() - * - * This function shall be called when the second FTP connection has been - * established and is confirmed connected. - */ + return result; +} -CURLcode Curl_ftp_nextconnect(struct connectdata *conn) +static CURLcode ftp_state_port_resp(struct connectdata *conn, + int ftpcode) { - struct SessionHandle *data=conn->data; - char *buf = data->state.buffer; /* this is our buffer */ - CURLcode result; - ssize_t nread; - int ftpcode; /* for ftp status */ - - /* the ftp struct is already inited in Curl_ftp_connect() */ struct FTP *ftp = conn->proto.ftp; - curl_off_t *bytecountp = ftp->bytecountp; + struct SessionHandle *data = conn->data; + ftpport fcmd = ftp->count1; + CURLcode result = CURLE_OK; - if(data->set.upload) { + if(ftpcode != 200) { + /* the command failed */ - /* Set type to binary (unless specified ASCII) */ - result = ftp_transfertype(conn, data->set.ftp_ascii); - if(result) - return result; + if (EPRT == fcmd) { + infof(data, "disabling EPRT usage\n"); + conn->bits.ftp_use_eprt = FALSE; + } + else if (LPRT == fcmd) { + infof(data, "disabling LPRT usage\n"); + conn->bits.ftp_use_lprt = FALSE; + } + fcmd++; - /* Send any PREQUOTE strings after transfer type is set? (Wesley Laxton)*/ - if(data->set.prequote) { - if ((result = ftp_sendquote(conn, data->set.prequote)) != CURLE_OK) - return result; + if(fcmd == DONE) { + failf(data, "Failed to do PORT"); + result = CURLE_FTP_PORT_FAILED; } + else + /* try next */ + result = ftp_state_use_port(conn, fcmd); + } + else { + infof(data, "Connect data stream actively\n"); + state(conn, FTP_STOP); /* end of DO phase */ + } - if(conn->resume_from) { - /* we're about to continue the uploading of a file */ - /* 1. get already existing file's size. We use the SIZE - command for this which may not exist in the server! - The SIZE command is not in RFC959. */ + return result; +} - /* 2. This used to set REST. But since we can do append, we - don't another ftp command. We just skip the source file - offset and then we APPEND the rest on the file instead */ +static CURLcode ftp_state_mdtm_resp(struct connectdata *conn, + int ftpcode) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + struct SessionHandle *data=conn->data; - /* 3. pass file-size number of bytes in the source file */ - /* 4. lower the infilesize counter */ - /* => transfer as usual */ + switch(ftpcode) { + case 213: + { + /* we got a time. Format should be: "YYYYMMDDHHMMSS[.sss]" where the + last .sss part is optional and means fractions of a second */ + int year, month, day, hour, minute, second; + char *buf = data->state.buffer; + if(6 == sscanf(buf+4, "%04d%02d%02d%02d%02d%02d", + &year, &month, &day, &hour, &minute, &second)) { + /* we have a time, reformat it */ + time_t secs=time(NULL); + /* using the good old yacc/bison yuck */ + snprintf(buf, sizeof(conn->data->state.buffer), + "%04d%02d%02d %02d:%02d:%02d GMT", + year, month, day, hour, minute, second); + /* now, convert this into a time() value: */ + data->info.filetime = curl_getdate(buf, &secs); + } - if(conn->resume_from < 0 ) { - /* we could've got a specified offset from the command line, - but now we know we didn't */ - curl_off_t gottensize; + /* If we asked for a time of the file and we actually got one as well, + we "emulate" a HTTP-style header in our output. */ - if(CURLE_OK != ftp_getsize(conn, ftp->file, &gottensize)) { - failf(data, "Couldn't get remote file size"); - return CURLE_FTP_COULDNT_GET_SIZE; - } - conn->resume_from = gottensize; +#ifdef HAVE_STRFTIME + if(data->set.get_filetime && (data->info.filetime>=0) ) { + struct tm *tm; + time_t clock = (time_t)data->info.filetime; +#ifdef HAVE_GMTIME_R + struct tm buffer; + tm = (struct tm *)gmtime_r(&clock, &buffer); +#else + tm = gmtime(&clock); +#endif + /* format: "Tue, 15 Nov 1994 12:45:26" */ + strftime(buf, BUFSIZE-1, + "Last-Modified: %a, %d %b %Y %H:%M:%S GMT\r\n", tm); + result = Curl_client_write(data, CLIENTWRITE_BOTH, buf, 0); + if(result) + return result; } +#endif + } + break; + default: + infof(data, "unsupported MDTM reply format\n"); + break; + case 550: /* "No such file or directory" */ + failf(data, "Given file does not exist"); + result = CURLE_FTP_COULDNT_RETR_FILE; + break; + } - if(conn->resume_from) { - /* do we still game? */ - curl_off_t passed=0; - /* enable append instead */ - data->set.ftp_append = 1; - - /* Now, let's read off the proper amount of bytes from the - input. If we knew it was a proper file we could've just - fseek()ed but we only have a stream here */ - do { - curl_off_t readthisamountnow = (conn->resume_from - passed); - curl_off_t actuallyread; - - if(readthisamountnow > BUFSIZE) - readthisamountnow = BUFSIZE; - - actuallyread = (curl_off_t) - conn->fread(data->state.buffer, 1, (size_t)readthisamountnow, - conn->fread_in); - - passed += actuallyread; - if(actuallyread != readthisamountnow) { - failf(data, "Could only read %" FORMAT_OFF_T - " bytes from the input", passed); - return CURLE_FTP_COULDNT_USE_REST; - } + if(data->set.timecondition) { + if((data->info.filetime > 0) && (data->set.timevalue > 0)) { + switch(data->set.timecondition) { + case CURL_TIMECOND_IFMODSINCE: + default: + if(data->info.filetime < data->set.timevalue) { + infof(data, "The requested document is not new enough\n"); + ftp->no_transfer = TRUE; /* mark this to not transfer data */ + state(conn, FTP_STOP); + return CURLE_OK; + } + break; + case CURL_TIMECOND_IFUNMODSINCE: + if(data->info.filetime > data->set.timevalue) { + infof(data, "The requested document is not old enough\n"); + ftp->no_transfer = TRUE; /* mark this to not transfer data */ + state(conn, FTP_STOP); + return CURLE_OK; } - while(passed != conn->resume_from); + break; + } /* switch */ + } + else { + infof(data, "Skipping time comparison\n"); + } + } - /* now, decrease the size of the read */ - if(data->set.infilesize>0) { - data->set.infilesize -= conn->resume_from; + if(!result) + result = ftp_state_post_mdtm(conn); - if(data->set.infilesize <= 0) { - infof(data, "File already completely uploaded\n"); + return result; +} - /* no data to transfer */ - result=Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL); +static CURLcode ftp_state_type_resp(struct connectdata *conn, + int ftpcode, + ftpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data=conn->data; - /* Set no_transfer so that we won't get any error in - * Curl_ftp_done() because we didn't transfer anything! */ - ftp->no_transfer = TRUE; + if(ftpcode != 200) { + failf(data, "Couldn't set desired mode"); + return CURLE_FTP_COULDNT_SET_BINARY; /* FIX */ + } + if(instate == FTP_TYPE) + result = ftp_state_post_type(conn); + else if(instate == FTP_LIST_TYPE) + result = ftp_state_post_listtype(conn); + else if(instate == FTP_RETR_TYPE) + result = ftp_state_post_retrtype(conn); + else if(instate == FTP_STOR_TYPE) + result = ftp_state_post_stortype(conn); - return CURLE_OK; - } + return result; +} + +static CURLcode ftp_state_post_retr_size(struct connectdata *conn, + curl_off_t filesize) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data=conn->data; + struct FTP *ftp = conn->proto.ftp; + + if (data->set.max_filesize && (filesize > data->set.max_filesize)) { + failf(data, "Maximum file size exceeded"); + return CURLE_FILESIZE_EXCEEDED; + } + ftp->downloadsize = filesize; + + if(conn->resume_from) { + /* We always (attempt to) get the size of downloads, so it is done before + this even when not doing resumes. */ + if(filesize == -1) { + infof(data, "ftp server doesn't support SIZE\n"); + /* We couldn't get the size and therefore we can't know if there really + is a part of the file left to get, although the server will just + close the connection when we start the connection so it won't cause + us any harm, just not make us exit as nicely. */ + } + else { + /* We got a file size report, so we check that there actually is a + part of the file left to get, or else we go home. */ + if(conn->resume_from< 0) { + /* We're supposed to download the last abs(from) bytes */ + if(filesize < -conn->resume_from) { + failf(data, "Offset (%" FORMAT_OFF_T + ") was beyond file size (%" FORMAT_OFF_T ")", + conn->resume_from, filesize); + return CURLE_BAD_DOWNLOAD_RESUME; + } + /* convert to size to download */ + ftp->downloadsize = -conn->resume_from; + /* download from where? */ + conn->resume_from = filesize - ftp->downloadsize; + } + else { + if(filesize < conn->resume_from) { + failf(data, "Offset (%" FORMAT_OFF_T + ") was beyond file size (%" FORMAT_OFF_T ")", + conn->resume_from, filesize); + return CURLE_BAD_DOWNLOAD_RESUME; } - /* we've passed, proceed as normal */ + /* Now store the number of bytes we are expected to download */ + ftp->downloadsize = filesize-conn->resume_from; } } - /* Send everything on data->state.in to the socket */ - if(data->set.ftp_append) { - /* we append onto the file instead of rewriting it */ - FTPSENDF(conn, "APPE %s", ftp->file); + if(ftp->downloadsize == 0) { + /* no data to transfer */ + result=Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL); + infof(data, "File already completely downloaded\n"); + + /* Set no_transfer so that we won't get any error in Curl_ftp_done() + * because we didn't transfer the any file */ + ftp->no_transfer = TRUE; + state(conn, FTP_STOP); + return CURLE_OK; + } + + /* Set resume file transfer offset */ + infof(data, "Instructs server to resume from offset %" FORMAT_OFF_T + "\n", conn->resume_from); + + NBFTPSENDF(conn, "REST %" FORMAT_OFF_T, conn->resume_from); + + state(conn, FTP_RETR_REST); + + } + else { + /* no resume */ + NBFTPSENDF(conn, "RETR %s", ftp->file); + state(conn, FTP_RETR); + } + + return result; +} + +static CURLcode ftp_state_size_resp(struct connectdata *conn, + int ftpcode, + ftpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data=conn->data; + curl_off_t filesize; + char *buf = data->state.buffer; + + /* get the size from the ascii string: */ + filesize = (ftpcode == 213)?curlx_strtoofft(buf+4, NULL, 0):-1; + + if(instate == FTP_SIZE) { + if(-1 != filesize) { + snprintf(buf, sizeof(data->state.buffer), + "Content-Length: %" FORMAT_OFF_T "\r\n", filesize); + result = Curl_client_write(data, CLIENTWRITE_BOTH, buf, 0); + if(result) + return result; + } + result = ftp_state_post_size(conn); + } + else if(instate == FTP_RETR_SIZE) + result = ftp_state_post_retr_size(conn, filesize); + else if(instate == FTP_STOR_SIZE) { + conn->resume_from = filesize; + result = ftp_state_ul_setup(conn); + } + + return result; +} + +static CURLcode ftp_state_rest_resp(struct connectdata *conn, + int ftpcode, + ftpstate instate) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + + switch(instate) { + case FTP_REST: + default: + if (ftpcode == 350) { + result = Curl_client_write(conn->data, CLIENTWRITE_BOTH, + (char *)"Accept-ranges: bytes\r\n", 0); + if(result) + return result; + } + + result = ftp_state_post_rest(conn); + break; + + case FTP_RETR_REST: + if (ftpcode != 350) { + failf(conn->data, "Couldn't use REST"); + result = CURLE_FTP_COULDNT_USE_REST; } else { - FTPSENDF(conn, "STOR %s", ftp->file); + NBFTPSENDF(conn, "RETR %s", ftp->file); + state(conn, FTP_RETR); } + break; + } - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); + return result; +} + +static CURLcode ftp_state_stor_resp(struct connectdata *conn, + int ftpcode) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct FTP *ftp = conn->proto.ftp; + + if(ftpcode>=400) { + failf(data, "Failed FTP upload: %0d", ftpcode); + /* oops, we never close the sockets! */ + return CURLE_FTP_COULDNT_STOR_FILE; + } + + if(data->set.ftp_use_port) { + /* BLOCKING */ + /* PORT means we are now awaiting the server to connect to us. */ + result = AllowServerConnect(conn); + if( result ) + return result; + } + + if(conn->ssl[SECONDARYSOCKET].use) { + /* since we only have a plaintext TCP connection here, we must now + do the TLS stuff */ + infof(data, "Doing the SSL/TLS handshake on the data stream\n"); + /* BLOCKING */ + result = Curl_SSLConnect(conn, SECONDARYSOCKET); if(result) return result; + } - if(ftpcode>=400) { - failf(data, "Failed FTP upload: %03d", ftpcode); - /* oops, we never close the sockets! */ - return CURLE_FTP_COULDNT_STOR_FILE; + *(ftp->bytecountp)=0; + + /* When we know we're uploading a specified file, we can get the file + size prior to the actual upload. */ + + Curl_pgrsSetUploadSize(data, data->set.infilesize); + + result = Curl_Transfer(conn, -1, -1, FALSE, NULL, /* no download */ + SECONDARYSOCKET, ftp->bytecountp); + state(conn, FTP_STOP); + + return result; +} + +/* for LIST and RETR responses */ +static CURLcode ftp_state_get_resp(struct connectdata *conn, + int ftpcode, + ftpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct FTP *ftp = conn->proto.ftp; + char *buf = data->state.buffer; + + if((ftpcode == 150) || (ftpcode == 125)) { + + /* + A; + 150 Opening BINARY mode data connection for /etc/passwd (2241 + bytes). (ok, the file is being transfered) + + B: + 150 Opening ASCII mode data connection for /bin/ls + + C: + 150 ASCII data connection for /bin/ls (137.167.104.91,37445) (0 bytes). + + D: + 150 Opening ASCII mode data connection for /linux/fisk/kpanelrc (0.0.0.0,0) (545 bytes). + + E: + 125 Data connection already open; Transfer starting. */ + + curl_off_t size=-1; /* default unknown size */ + + + /* + * It appears that there are FTP-servers that return size 0 for files when + * SIZE is used on the file while being in BINARY mode. To work around + * that (stupid) behavior, we attempt to parse the RETR response even if + * the SIZE returned size zero. + * + * Debugging help from Salvatore Sorrentino on February 26, 2003. + */ + + if((instate != FTP_LIST) && + !data->set.ftp_ascii && + (ftp->downloadsize < 1)) { + /* + * It seems directory listings either don't show the size or very + * often uses size 0 anyway. ASCII transfers may very well turn out + * that the transfered amount of data is not the same as this line + * tells, why using this number in those cases only confuses us. + * + * Example D above makes this parsing a little tricky */ + char *bytes; + bytes=strstr(buf, " bytes"); + if(bytes--) { + long in=bytes-buf; + /* this is a hint there is size information in there! ;-) */ + while(--in) { + /* scan for the left parenthesis and break there */ + if('(' == *bytes) + break; + /* skip only digits */ + if(!isdigit((int)*bytes)) { + bytes=NULL; + break; + } + /* one more estep backwards */ + bytes--; + } + /* if we have nothing but digits: */ + if(bytes++) { + /* get the number! */ + size = curlx_strtoofft(bytes, NULL, 0); + } + } } + else if(ftp->downloadsize > -1) + size = ftp->downloadsize; if(data->set.ftp_use_port) { - /* PORT means we are now awaiting the server to connect to us. */ + /* BLOCKING */ result = AllowServerConnect(conn); if( result ) return result; @@ -1869,459 +2108,1038 @@ CURLcode Curl_ftp_nextconnect(struct connectdata *conn) return result; } - *bytecountp=0; + if(size > conn->maxdownload && conn->maxdownload > 0) + size = conn->size = conn->maxdownload; + + if(instate != FTP_LIST) + infof(data, "Getting file with size: %" FORMAT_OFF_T "\n", size); + + /* FTP download: */ + result=Curl_Transfer(conn, SECONDARYSOCKET, size, FALSE, + ftp->bytecountp, + -1, NULL); /* no upload here */ + if(result) + return result; + + state(conn, FTP_STOP); + } + else { + if((instate == FTP_LIST) && (ftpcode == 450)) { + /* simply no matching files in the dir listing */ + ftp->no_transfer = TRUE; /* don't download anything */ + state(conn, FTP_STOP); /* this phase is over */ + } + else { + failf(data, "%s", buf+4); + return CURLE_FTP_COULDNT_RETR_FILE; + } + } + + return result; +} - /* When we know we're uploading a specified file, we can get the file - size prior to the actual upload. */ +/* after USER, PASS and ACCT */ +static CURLcode ftp_state_loggedin(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + infof(data, "We have successfully logged in\n"); - Curl_pgrsSetUploadSize(data, data->set.infilesize); +#ifdef HAVE_KRB4 + /* We are logged in with Kerberos, now set the requested + * protection level + */ + if(conn->sec_complete) + /* BLOCKING */ + Curl_sec_set_protection_level(conn); - result = Curl_Transfer(conn, -1, -1, FALSE, NULL, /* no download */ - SECONDARYSOCKET, bytecountp); + /* We may need to issue a KAUTH here to have access to the files + * do it if user supplied a password + */ + if(conn->passwd && *conn->passwd) { + /* BLOCKING */ + result = Curl_krb_kauth(conn); if(result) return result; + } +#endif + if(conn->ssl[FIRSTSOCKET].use) { + /* PBSZ = PROTECTION BUFFER SIZE. + + The 'draft-murray-auth-ftp-ssl' (draft 12, page 7) says: + + Specifically, the PROT command MUST be preceded by a PBSZ + command and a PBSZ command MUST be preceded by a successful + security data exchange (the TLS negotiation in this case) + + ... (and on page 8): + Thus the PBSZ command must still be issued, but must have a + parameter of '0' to indicate that no buffering is taking place + and the data connection should not be encapsulated. + */ + NBFTPSENDF(conn, "PBSZ %d", 0); + state(conn, FTP_PBSZ); + } + else { + result = ftp_state_pwd(conn); + } + return result; +} + +/* for USER and PASS responses */ +static CURLcode ftp_state_user_resp(struct connectdata *conn, + int ftpcode, + ftpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct FTP *ftp = conn->proto.ftp; + (void)instate; /* no use for this yet */ + + if((ftpcode == 331) && (ftp->state == FTP_USER)) { + /* 331 Password required for ... + (the server requires to send the user's password too) */ + NBFTPSENDF(conn, "PASS %s", ftp->passwd?ftp->passwd:""); + state(conn, FTP_PASS); } - else if(!conn->bits.no_body) { - /* Retrieve file or directory */ - bool dirlist=FALSE; - curl_off_t downloadsize=-1; - - if(conn->bits.use_range && conn->range) { - curl_off_t from, to; - curl_off_t totalsize=-1; - char *ptr; - char *ptr2; - - from=curlx_strtoofft(conn->range, &ptr, 0); - while(ptr && *ptr && (isspace((int)*ptr) || (*ptr=='-'))) - ptr++; - to=curlx_strtoofft(ptr, &ptr2, 0); - if(ptr == ptr2) { - /* we didn't get any digit */ - to=-1; + else if(ftpcode/100 == 2) { + /* 230 User ... logged in. + (the user logged in with or without password) */ + result = ftp_state_loggedin(conn); + } + else if(ftpcode == 332) { + if(data->set.ftp_account) { + NBFTPSENDF(conn, "ACCT %s", data->set.ftp_account); + state(conn, FTP_ACCT); + } + else { + failf(data, "ACCT requested by none available"); + result = CURLE_LOGIN_DENIED; + } + } + else { + /* All other response codes, like: + + 530 User ... access denied + (the server denies to log the specified user) */ + failf(data, "Access denied: %03d", ftpcode); + result = CURLE_LOGIN_DENIED; + } + return result; +} + +/* for ACCT response */ +static CURLcode ftp_state_acct_resp(struct connectdata *conn, + int ftpcode) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + if(ftpcode != 230) { + failf(data, "ACCT rejected by server: %03d", ftpcode); + result = CURLE_FTP_WEIRD_PASS_REPLY; /* FIX */ + } + else + result = ftp_state_loggedin(conn); + + return result; +} + + +static CURLcode ftp_statemach_act(struct connectdata *conn) +{ + CURLcode result; + curl_socket_t sock = conn->sock[FIRSTSOCKET]; + struct SessionHandle *data=conn->data; + int ftpcode; + struct FTP *ftp = conn->proto.ftp; + static const char * const ftpauth[] = { + "SSL", "TLS" + }; + size_t nread; + + if(ftp->sendleft) { + /* we have a piece of a command still left to send */ + ssize_t written; + result = Curl_write(conn, sock, ftp->sendthis + ftp->sendsize - + ftp->sendleft, ftp->sendleft, &written); + if(result) + return result; + + if(written != (ssize_t)ftp->sendleft) { + /* only a fraction was sent */ + ftp->sendleft -= written; + } + else { + free(ftp->sendthis); + ftp->sendthis=NULL; + ftp->sendleft = ftp->sendsize = 0; + ftp->response = Curl_tvnow(); + } + return CURLE_OK; + } + + /* we read a piece of response */ + result = ftp_readresp(sock, conn, &ftpcode, &nread); + if(result) + return result; + + if(ftpcode) { + /* we have now received a full FTP server response */ + switch(ftp->state) { + case FTP_WAIT220: + if(ftpcode != 220) { + failf(data, "This doesn't seem like a nice ftp-server response"); + return CURLE_FTP_WEIRD_SERVER_REPLY; } - if((-1 == to) && (from>=0)) { - /* X - */ - conn->resume_from = from; - infof(data, "FTP RANGE %" FORMAT_OFF_T " to end of file\n", from); + + /* We have received a 220 response fine, now we proceed. */ +#ifdef HAVE_KRB4 + if(data->set.krb4) { + /* If not anonymous login, try a secure login. Note that this + procedure is still BLOCKING. */ + + Curl_sec_request_prot(conn, "private"); + /* We set private first as default, in case the line below fails to + set a valid level */ + Curl_sec_request_prot(conn, data->set.krb4_level); + + if(Curl_sec_login(conn) != 0) + infof(data, "Logging in with password in cleartext!\n"); + else + infof(data, "Authentication successful\n"); } - else if(from < 0) { - /* -Y */ - totalsize = -from; - conn->maxdownload = -from; - conn->resume_from = from; - infof(data, "FTP RANGE the last %" FORMAT_OFF_T " bytes\n", totalsize); +#endif + + if(data->set.ftp_ssl && !conn->ssl[FIRSTSOCKET].use) { + /* We don't have a SSL/TLS connection yet, but FTPS is + requested. Try a FTPS connection now */ + + ftp->count3=0; + switch(data->set.ftpsslauth) { + case CURLFTPAUTH_DEFAULT: + case CURLFTPAUTH_SSL: + ftp->count2 = 1; /* add one to get next */ + ftp->count1 = 0; + break; + case CURLFTPAUTH_TLS: + ftp->count2 = -1; /* subtract one to get next */ + ftp->count1 = 1; + break; + default: + failf(data, "unsupported parameter to CURLOPT_FTPSSLAUTH: %d\n", + data->set.ftpsslauth); + return CURLE_FAILED_INIT; /* we don't know what to do */ + } + NBFTPSENDF(conn, "AUTH %s", ftpauth[ftp->count1]); + state(conn, FTP_AUTH); } else { - /* X-Y */ - totalsize = to-from; - conn->maxdownload = totalsize+1; /* include the last mentioned byte */ - conn->resume_from = from; - infof(data, "FTP RANGE from %" FORMAT_OFF_T - " getting %" FORMAT_OFF_T " bytes\n", from, conn->maxdownload); + ftp_state_user(conn); + if(result) + return result; } - infof(data, "range-download from %" FORMAT_OFF_T - " to %" FORMAT_OFF_T ", totally %" FORMAT_OFF_T " bytes\n", - from, to, conn->maxdownload); - ftp->dont_check = TRUE; /* dont check for successful transfer */ - } - if((data->set.ftp_list_only) || !ftp->file) { - /* The specified path ends with a slash, and therefore we think this - is a directory that is requested, use LIST. But before that we - need to set ASCII transfer mode. */ - dirlist = TRUE; + break; - /* Set type to ASCII */ - result = ftp_transfertype(conn, TRUE /* ASCII enforced */); - if(result) - return result; + case FTP_AUTH: + /* we have gotten the response to a previous AUTH command */ - /* if this output is to be machine-parsed, the NLST command will be - better used since the LIST command output is not specified or - standard in any way */ + /* RFC2228 (page 5) says: + * + * If the server is willing to accept the named security mechanism, + * and does not require any security data, it must respond with + * reply code 234/334. + */ - FTPSENDF(conn, "%s", - data->set.customrequest?data->set.customrequest: - (data->set.ftp_list_only?"NLST":"LIST")); - } - else { - curl_off_t foundsize; + if((ftpcode == 234) || (ftpcode == 334)) { + /* Curl_SSLConnect is BLOCKING */ + result = Curl_SSLConnect(conn, FIRSTSOCKET); + if(result) + return result; + conn->protocol |= PROT_FTPS; + conn->ssl[SECONDARYSOCKET].use = FALSE; /* clear-text data */ + } + else if(ftp->count3 < 1) { + ftp->count3++; + ftp->count1 += ftp->count2; /* get next attempt */ + NBFTPSENDF(conn, "AUTH %s", ftpauth[ftp->count1]); + /* remain in this same state */ + } + else { + result = ftp_state_user(conn); + if(result) + return result; + } + break; - /* Set type to binary (unless specified ASCII) */ - result = ftp_transfertype(conn, data->set.ftp_ascii); - if(result) - return result; + case FTP_USER: + case FTP_PASS: + result = ftp_state_user_resp(conn, ftpcode, ftp->state); + break; + + case FTP_ACCT: + result = ftp_state_acct_resp(conn, ftpcode); + break; + + case FTP_PBSZ: + /* FIX: check response code */ - /* Send any PREQUOTE strings after transfer type is set? */ - if(data->set.prequote) { - if ((result = ftp_sendquote(conn, data->set.prequote)) != CURLE_OK) + /* For TLS, the data connection can have one of two security levels. + + 1) Clear (requested by 'PROT C') + + 2)Private (requested by 'PROT P') + */ + if(!conn->ssl[SECONDARYSOCKET].use) { + NBFTPSENDF(conn, "PROT %c", 'P'); + state(conn, FTP_PROT); + } + else { + result = ftp_state_pwd(conn); + if(result) return result; } - /* Attempt to get the size, it'll be useful in some cases: for resumed - downloads and when talking to servers that don't give away the size - in the RETR response line. */ - result = ftp_getsize(conn, ftp->file, &foundsize); - if(CURLE_OK == result) { - if (data->set.max_filesize && foundsize > data->set.max_filesize) { - failf(data, "Maximum file size exceeded"); - return CURLE_FILESIZE_EXCEEDED; + break; + + case FTP_PROT: + if(ftpcode/100 == 2) + /* We have enabled SSL for the data connection! */ + conn->ssl[SECONDARYSOCKET].use = TRUE; + /* FTP servers typically responds with 500 if they decide to reject + our 'P' request */ + else if(data->set.ftp_ssl> CURLFTPSSL_CONTROL) + /* we failed and bails out */ + return CURLE_FTP_SSL_FAILED; + + result = ftp_state_pwd(conn); + if(result) + return result; + break; + + case FTP_PWD: + if(ftpcode == 257) { + char *dir = (char *)malloc(nread+1); + char *store=dir; + char *ptr=&data->state.buffer[4]; /* start on the first letter */ + + if(!dir) + return CURLE_OUT_OF_MEMORY; + + /* Reply format is like + 257<space>"<directory-name>"<space><commentary> and the RFC959 + says + + The directory name can contain any character; embedded + double-quotes should be escaped by double-quotes (the + "quote-doubling" convention). + */ + if('\"' == *ptr) { + /* it started good */ + ptr++; + while(ptr && *ptr) { + if('\"' == *ptr) { + if('\"' == ptr[1]) { + /* "quote-doubling" */ + *store = ptr[1]; + ptr++; + } + else { + /* end of path */ + *store = '\0'; /* zero terminate */ + break; /* get out of this loop */ + } + } + else + *store = *ptr; + store++; + ptr++; + } + ftp->entrypath =dir; /* remember this */ + infof(data, "Entry path is '%s'\n", ftp->entrypath); + } + else { + /* couldn't get the path */ + free(dir); + infof(data, "Failed to figure out path\n"); } - downloadsize = foundsize; } + state(conn, FTP_STOP); /* we are done with the CONNECT phase! */ + infof(data, "protocol connect phase DONE\n"); + break; + + case FTP_QUOTE: + case FTP_POSTQUOTE: + case FTP_RETR_PREQUOTE: + case FTP_STOR_PREQUOTE: + if(ftpcode >= 400) { + failf(conn->data, "QUOT command failed with %03d", ftpcode); + return CURLE_FTP_QUOTE_ERROR; + } + result = ftp_state_quote(conn, FALSE, ftp->state); + if(result) + return result; - if(conn->resume_from) { + break; - /* Daniel: (August 4, 1999) - * - * We start with trying to use the SIZE command to figure out the size - * of the file we're gonna get. If we can get the size, this is by far - * the best way to know if we're trying to resume beyond the EOF. - * - * Daniel, November 28, 2001. We *always* get the size on downloads - * now, so it is done before this even when not doing resumes. I saved - * the comment above for nostalgical reasons! ;-) - */ - if(CURLE_OK != result) { - infof(data, "ftp server doesn't support SIZE\n"); - /* We couldn't get the size and therefore we can't know if there - really is a part of the file left to get, although the server - will just close the connection when we start the connection so it - won't cause us any harm, just not make us exit as nicely. */ + case FTP_CWD: + if(ftpcode/100 != 2) { + /* failure to CWD there */ + if(conn->data->set.ftp_create_missing_dirs && + ftp->count1 && !ftp->count2) { + /* try making it */ + ftp->count2++; /* counter to prevent CWD-MKD loops */ + NBFTPSENDF(conn, "MKD %s", ftp->dirs[ftp->count1 - 1]); + state(conn, FTP_MKD); + } + else + /* return failure */ + return CURLE_FTP_ACCESS_DENIED; + } + else { + /* success */ + ftp->count2=0; + if(++ftp->count1 <= ftp->dirdepth) { + /* send next CWD */ + NBFTPSENDF(conn, "CWD %s", ftp->dirs[ftp->count1 - 1]); } else { - /* We got a file size report, so we check that there actually is a - part of the file left to get, or else we go home. */ - if(conn->resume_from< 0) { - /* We're supposed to download the last abs(from) bytes */ - if(foundsize < -conn->resume_from) { - failf(data, "Offset (%" FORMAT_OFF_T - ") was beyond file size (%" FORMAT_OFF_T ")", - conn->resume_from, foundsize); - return CURLE_BAD_DOWNLOAD_RESUME; - } - /* convert to size to download */ - downloadsize = -conn->resume_from; - /* download from where? */ - conn->resume_from = foundsize - downloadsize; - } - else { - if(foundsize < conn->resume_from) { - failf(data, "Offset (%" FORMAT_OFF_T - ") was beyond file size (%" FORMAT_OFF_T ")", - conn->resume_from, foundsize); - return CURLE_BAD_DOWNLOAD_RESUME; - } - /* Now store the number of bytes we are expected to download */ - downloadsize = foundsize-conn->resume_from; - } + result = ftp_state_post_cwd(conn); + if(result) + return result; } + } + break; - if (downloadsize == 0) { - /* no data to transfer */ - result=Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL); - infof(data, "File already completely downloaded\n"); + case FTP_MKD: + if(ftpcode/100 != 2) { + /* failure to MKD the dir */ + failf(data, "Failed to MKD dir: %03d", ftpcode); + return CURLE_FTP_ACCESS_DENIED; + } + state(conn, FTP_CWD); + /* send CWD */ + NBFTPSENDF(conn, "CWD %s", ftp->dirs[ftp->count1 - 1]); + break; - /* Set no_transfer so that we won't get any error in Curl_ftp_done() - * because we didn't transfer the any file */ - ftp->no_transfer = TRUE; - return CURLE_OK; - } + case FTP_MDTM: + result = ftp_state_mdtm_resp(conn, ftpcode); + break; + + case FTP_TYPE: + case FTP_LIST_TYPE: + case FTP_RETR_TYPE: + case FTP_STOR_TYPE: + result = ftp_state_type_resp(conn, ftpcode, ftp->state); + break; - /* Set resume file transfer offset */ - infof(data, "Instructs server to resume from offset %" FORMAT_OFF_T - "\n", - conn->resume_from); + case FTP_SIZE: + case FTP_RETR_SIZE: + case FTP_STOR_SIZE: + result = ftp_state_size_resp(conn, ftpcode, ftp->state); + break; - FTPSENDF(conn, "REST %" FORMAT_OFF_T, conn->resume_from); + case FTP_REST: + case FTP_RETR_REST: + result = ftp_state_rest_resp(conn, ftpcode, ftp->state); + break; - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if(result) - return result; + case FTP_PASV: + result = ftp_state_pasv_resp(conn, ftpcode); + break; - if(ftpcode != 350) { - failf(data, "Couldn't use REST: %03d", ftpcode); - return CURLE_FTP_COULDNT_USE_REST; - } - } + case FTP_PORT: + result = ftp_state_port_resp(conn, ftpcode); + break; + + case FTP_LIST: + case FTP_RETR: + result = ftp_state_get_resp(conn, ftpcode, ftp->state); + break; - FTPSENDF(conn, "RETR %s", ftp->file); + case FTP_STOR: + result = ftp_state_stor_resp(conn, ftpcode); + break; + + case FTP_QUIT: + /* fallthrough, just stop! */ + default: + /* internal error */ + state(conn, FTP_STOP); + break; } + } /* if(ftpcode) */ - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); + return result; +} + +/* Returns timeout in ms. 0 or negative number means the timeout has already + triggered */ +static long ftp_state_timeout(struct connectdata *conn) +{ + struct SessionHandle *data=conn->data; + struct FTP *ftp = conn->proto.ftp; + long timeout_ms=360000; /* in milliseconds */ + + if(data->set.ftp_response_timeout ) + /* if CURLOPT_FTP_RESPONSE_TIMEOUT is set, use that to determine remaining + time. Also, use ftp->response because FTP_RESPONSE_TIMEOUT is supposed + to govern the response for any given ftp response, not for the time + from connect to the given ftp response. */ + timeout_ms = data->set.ftp_response_timeout*1000 - /* timeout time */ + Curl_tvdiff(Curl_tvnow(), ftp->response); /* spent time */ + else if(data->set.timeout) + /* if timeout is requested, find out how much remaining time we have */ + timeout_ms = data->set.timeout*1000 - /* timeout time */ + Curl_tvdiff(Curl_tvnow(), conn->now); /* spent time */ + else + /* Without a requested timeout, we only wait 'response_time' seconds for + the full response to arrive before we bail out */ + timeout_ms = ftp->response_time*1000 - + Curl_tvdiff(Curl_tvnow(), ftp->response); /* spent time */ + + return timeout_ms; +} + + +/* called repeatedly until done from multi.c */ +CURLcode Curl_ftp_multi_statemach(struct connectdata *conn, + bool *done) +{ + curl_socket_t sock = conn->sock[FIRSTSOCKET]; + int rc; + struct SessionHandle *data=conn->data; + struct FTP *ftp = conn->proto.ftp; + CURLcode result = CURLE_OK; + long timeout_ms = ftp_state_timeout(conn); + + *done = FALSE; /* default to not done yet */ + + if(timeout_ms <= 0) { + failf(data, "FTP response timeout"); + return CURLE_OPERATION_TIMEDOUT; + } + + rc = Curl_select(ftp->sendleft?CURL_SOCKET_BAD:sock, /* reading */ + ftp->sendleft?sock:CURL_SOCKET_BAD, /* writing */ + 0); + + if(rc == -1) { + failf(data, "select error"); + return CURLE_OUT_OF_MEMORY; + } + else if(rc != 0) { + result = ftp_statemach_act(conn); + *done = (ftp->state == FTP_STOP); + } + /* if rc == 0, then select() timed out */ + + return result; +} + +static CURLcode ftp_easy_statemach(struct connectdata *conn) +{ + curl_socket_t sock = conn->sock[FIRSTSOCKET]; + int rc; + struct SessionHandle *data=conn->data; + struct FTP *ftp = conn->proto.ftp; + CURLcode result = CURLE_OK; + + while(ftp->state != FTP_STOP) { + long timeout_ms = ftp_state_timeout(conn); + + if(timeout_ms <=0 ) { + failf(data, "FTP response timeout"); + return CURLE_OPERATION_TIMEDOUT; /* already too little time */ + } + + rc = Curl_select(ftp->sendleft?CURL_SOCKET_BAD:sock, /* reading */ + ftp->sendleft?sock:CURL_SOCKET_BAD, /* writing */ + timeout_ms); + + if(rc == -1) { + failf(data, "select error"); + return CURLE_OUT_OF_MEMORY; + } + else if(rc == 0) { + result = CURLE_OPERATION_TIMEDOUT; + break; + } + else { + result = ftp_statemach_act(conn); + if(result) + break; + } + } + + return result; +} + +/* + * Curl_ftp_connect() should do everything that is to be considered a part of + * the connection phase. + * + * The variable 'done' points to will be TRUE if the protocol-layer connect + * phase is done when this function returns, or FALSE is not. When called as + * a part of the easy interface, it will always be TRUE. + */ +CURLcode Curl_ftp_connect(struct connectdata *conn, + bool *done) /* see description above */ +{ + struct FTP *ftp; + CURLcode result; + + *done = FALSE; /* default to not done yet */ + + ftp = (struct FTP *)calloc(sizeof(struct FTP), 1); + if(!ftp) + return CURLE_OUT_OF_MEMORY; + + conn->proto.ftp = ftp; + + /* We always support persistant connections on ftp */ + conn->bits.close = FALSE; + + /* get some initial data into the ftp struct */ + ftp->bytecountp = &conn->bytecount; + + /* no need to duplicate them, this connectdata struct won't change */ + ftp->user = conn->user; + ftp->passwd = conn->passwd; + if (isBadFtpString(ftp->user) || isBadFtpString(ftp->passwd)) + return CURLE_URL_MALFORMAT; + + ftp->response_time = 3600; /* set default response time-out */ + +#ifndef CURL_DISABLE_HTTP + if (conn->bits.tunnel_proxy) { + /* BLOCKING */ + /* We want "seamless" FTP operations through HTTP proxy tunnel */ + result = Curl_ConnectHTTPProxyTunnel(conn, FIRSTSOCKET, + conn->host.name, conn->remote_port); + if(CURLE_OK != result) + return result; + } +#endif /* CURL_DISABLE_HTTP */ + + if(conn->protocol & PROT_FTPS) { + /* BLOCKING */ + /* FTPS is simply ftp with SSL for the control channel */ + /* now, perform the SSL initialization for this socket */ + result = Curl_SSLConnect(conn, FIRSTSOCKET); if(result) return result; + } - if((ftpcode == 150) || (ftpcode == 125)) { + /* When we connect, we start in the state where we await the 220 + response */ + state(conn, FTP_WAIT220); + ftp->response = Curl_tvnow(); /* start response time-out now! */ - /* - A; - 150 Opening BINARY mode data connection for /etc/passwd (2241 - bytes). (ok, the file is being transfered) + if(conn->data->state.used_interface == Curl_if_multi) + result = Curl_ftp_multi_statemach(conn, done); + else { + result = ftp_easy_statemach(conn); + if(!result) + *done = TRUE; + } - B: - 150 Opening ASCII mode data connection for /bin/ls + return result; +} - C: - 150 ASCII data connection for /bin/ls (137.167.104.91,37445) (0 bytes). +/*********************************************************************** + * + * Curl_ftp_done() + * + * The DONE function. This does what needs to be done after a single DO has + * performed. + * + * Input argument is already checked for validity. + */ +CURLcode Curl_ftp_done(struct connectdata *conn, CURLcode status) +{ + struct SessionHandle *data = conn->data; + struct FTP *ftp = conn->proto.ftp; + ssize_t nread; + int ftpcode; + CURLcode result=CURLE_OK; + bool was_ctl_valid = ftp->ctl_valid; + size_t flen; + size_t dlen; + char *path; - D: - 150 Opening ASCII mode data connection for /linux/fisk/kpanelrc (0.0.0.0,0) (545 bytes). + /* now store a copy of the directory we are in */ + if(ftp->prevpath) + free(ftp->prevpath); - E: - 125 Data connection already open; Transfer starting. */ + path = curl_unescape(conn->path, 0); /* get the "raw" path */ + if(!path) + return CURLE_OUT_OF_MEMORY; - curl_off_t size=-1; /* default unknown size */ + flen = ftp->file?strlen(ftp->file):0; /* file is "raw" already */ + dlen = strlen(path)-flen; + if(dlen) { + ftp->prevpath = path; + if(flen) + /* if 'path' is not the whole string */ + ftp->prevpath[dlen]=0; /* terminate */ + infof(data, "Remembering we are in dir %s\n", ftp->prevpath); + } + else { + ftp->prevpath = NULL; /* no path */ + free(path); + } + /* free the dir tree and file parts */ + freedirs(ftp); + ftp->ctl_valid = FALSE; - /* - * It appears that there are FTP-servers that return size 0 for files - * when SIZE is used on the file while being in BINARY mode. To work - * around that (stupid) behavior, we attempt to parse the RETR response - * even if the SIZE returned size zero. - * - * Debugging help from Salvatore Sorrentino on February 26, 2003. - */ + if(data->set.upload) { + if((-1 != data->set.infilesize) && + (data->set.infilesize != *ftp->bytecountp) && + !data->set.crlf) { + failf(data, "Uploaded unaligned file size (%" FORMAT_OFF_T + " out of %" FORMAT_OFF_T " bytes)", + *ftp->bytecountp, data->set.infilesize); + conn->bits.close = TRUE; /* close this connection since we don't + know what state this error leaves us in */ + return CURLE_PARTIAL_FILE; + } + } + else { + if((-1 != conn->size) && (conn->size != *ftp->bytecountp) && + (conn->maxdownload != *ftp->bytecountp)) { + failf(data, "Received only partial file: %" FORMAT_OFF_T " bytes", + *ftp->bytecountp); + conn->bits.close = TRUE; /* close this connection since we don't + know what state this error leaves us in */ + return CURLE_PARTIAL_FILE; + } + else if(!ftp->dont_check && + !*ftp->bytecountp && + (conn->size>0)) { + /* We consider this an error, but there's no true FTP error received + why we need to continue to "read out" the server response too. + We don't want to leave a "waiting" server reply if we'll get told + to make a second request on this same connection! */ + failf(data, "No data was received!"); + result = CURLE_FTP_COULDNT_RETR_FILE; + } + } - if(!dirlist && - !data->set.ftp_ascii && - (downloadsize < 1)) { - /* - * It seems directory listings either don't show the size or very - * often uses size 0 anyway. ASCII transfers may very well turn out - * that the transfered amount of data is not the same as this line - * tells, why using this number in those cases only confuses us. - * - * Example D above makes this parsing a little tricky */ - char *bytes; - bytes=strstr(buf, " bytes"); - if(bytes--) { - long in=bytes-buf; - /* this is a hint there is size information in there! ;-) */ - while(--in) { - /* scan for the parenthesis and break there */ - if('(' == *bytes) - break; - /* if only skip digits, or else we're in deep trouble */ - if(!isdigit((int)*bytes)) { - bytes=NULL; - break; - } - /* one more estep backwards */ - bytes--; - } - /* only if we have nothing but digits: */ - if(bytes++) { - /* get the number! */ - size = curlx_strtoofft(bytes, NULL, 0); - } + switch(status) { + case CURLE_BAD_DOWNLOAD_RESUME: + case CURLE_FTP_WEIRD_PASV_REPLY: + case CURLE_FTP_PORT_FAILED: + case CURLE_FTP_COULDNT_SET_BINARY: + case CURLE_FTP_COULDNT_RETR_FILE: + case CURLE_FTP_ACCESS_DENIED: + /* the connection stays alive fine even though this happened */ + /* fall-through */ + case CURLE_OK: /* doesn't affect the control connection's status */ + ftp->ctl_valid = was_ctl_valid; + break; + default: /* by default, an error means the control connection is + wedged and should not be used anymore */ + ftp->ctl_valid = FALSE; + break; + } - } - } - else if(downloadsize > -1) - size = downloadsize; +#ifdef HAVE_KRB4 + Curl_sec_fflush_fd(conn, conn->sock[SECONDARYSOCKET]); +#endif - if(data->set.ftp_use_port) { - result = AllowServerConnect(conn); - if( result ) - return result; - } + /* shut down the socket to inform the server we're done */ - if(conn->ssl[SECONDARYSOCKET].use) { - /* since we only have a plaintext TCP connection here, we must now - do the TLS stuff */ - infof(data, "Doing the SSL/TLS handshake on the data stream\n"); - result = Curl_SSLConnect(conn, SECONDARYSOCKET); - if(result) - return result; - } +#ifdef _WIN32_WCE + shutdown(conn->sock[SECONDARYSOCKET],2); /* SD_BOTH */ +#endif - if(size > conn->maxdownload && conn->maxdownload > 0) - size = conn->size = conn->maxdownload; + sclose(conn->sock[SECONDARYSOCKET]); - infof(data, "Getting file with size: %" FORMAT_OFF_T "\n", size); + conn->sock[SECONDARYSOCKET] = CURL_SOCKET_BAD; - /* FTP download: */ - result=Curl_Transfer(conn, SECONDARYSOCKET, size, FALSE, - bytecountp, - -1, NULL); /* no upload here */ - if(result) - return result; + if(!ftp->no_transfer && !status) { + /* Let's see what the server says about the transfer we just performed, + * but lower the timeout as sometimes this connection has died while the + * data has been transfered. This happens when doing through NATs etc that + * abandon old silent connections. + */ + ftp->response_time = 60; /* give it only a minute for now */ + + result = Curl_GetFTPResponse(&nread, conn, &ftpcode); + + ftp->response_time = 3600; /* set this back to one hour waits */ + + if(!nread && (CURLE_OPERATION_TIMEDOUT == result)) { + failf(data, "control connection looks dead"); + return result; } - else { - if(dirlist && (ftpcode == 450)) { - /* simply no matching files */ - ftp->no_transfer = TRUE; /* don't think we should download anything */ - } - else { - failf(data, "RETR failed: %03d", ftpcode); - return CURLE_FTP_COULDNT_RETR_FILE; + + if(result) + return result; + + if(!ftp->dont_check) { + /* 226 Transfer complete, 250 Requested file action okay, completed. */ + if((ftpcode != 226) && (ftpcode != 250)) { + failf(data, "server did not report OK, got %d", ftpcode); + return CURLE_FTP_WRITE_ERROR; } } + } + /* clear these for next connection */ + ftp->no_transfer = FALSE; + ftp->dont_check = FALSE; + + if (!result && conn->sec_conn) { /* 3rd party transfer */ + /* "done" with the secondary connection */ + result = Curl_ftp_done(conn->sec_conn, status); } - /* end of transfer */ - return CURLE_OK; + /* Send any post-transfer QUOTE strings? */ + if(!status && !result && data->set.postquote) + result = ftp_sendquote(conn, data->set.postquote); + + return result; } /*********************************************************************** * - * ftp_perform() + * ftp_sendquote() * - * This is the actual DO function for FTP. Get a file/directory according to - * the options previously setup. + * Where a 'quote' means a list of custom commands to send to the server. + * The quote list is passed as an argument. */ static -CURLcode ftp_perform(struct connectdata *conn, - bool *connected) /* for the TCP connect status after - PASV / PORT */ +CURLcode ftp_sendquote(struct connectdata *conn, struct curl_slist *quote) { - /* this is FTP and no proxy */ - CURLcode result=CURLE_OK; - struct SessionHandle *data=conn->data; - char *buf = data->state.buffer; /* this is our buffer */ + struct curl_slist *item; + ssize_t nread; + int ftpcode; + CURLcode result; - /* the ftp struct is already inited in Curl_ftp_connect() */ - struct FTP *ftp = conn->proto.ftp; + item = quote; + while (item) { + if (item->data) { + FTPSENDF(conn, "%s", item->data); - /* Send any QUOTE strings? */ - if(data->set.quote) { - if ((result = ftp_sendquote(conn, data->set.quote)) != CURLE_OK) - return result; + result = Curl_GetFTPResponse(&nread, conn, &ftpcode); + if (result) + return result; + + if (ftpcode >= 400) { + failf(conn->data, "QUOT string not accepted: %s", item->data); + return CURLE_FTP_QUOTE_ERROR; + } + } + + item = item->next; } - result = ftp_cwd_and_create_path(conn); - if (result) + return CURLE_OK; +} + +/*********************************************************************** + * + * ftp_transfertype() + * + * Set transfer type. We only deal with ASCII or BINARY so this function + * sets one of them. + */ +static CURLcode ftp_transfertype(struct connectdata *conn, + bool ascii) +{ + struct SessionHandle *data = conn->data; + int ftpcode; + ssize_t nread; + CURLcode result; + + FTPSENDF(conn, "TYPE %s", ascii?"A":"I"); + + result = Curl_GetFTPResponse(&nread, conn, &ftpcode); + if(result) return result; - /* Requested time of file or time-depended transfer? */ - if((data->set.get_filetime || data->set.timecondition) && - ftp->file) { - result = ftp_getfiletime(conn, ftp->file); - switch( result ) - { - case CURLE_FTP_COULDNT_RETR_FILE: - case CURLE_OK: - if(data->set.timecondition) { - if((data->info.filetime > 0) && (data->set.timevalue > 0)) { - switch(data->set.timecondition) { - case CURL_TIMECOND_IFMODSINCE: - default: - if(data->info.filetime < data->set.timevalue) { - infof(data, "The requested document is not new enough\n"); - ftp->no_transfer = TRUE; /* mark this to not transfer data */ - return CURLE_OK; - } - break; - case CURL_TIMECOND_IFUNMODSINCE: - if(data->info.filetime > data->set.timevalue) { - infof(data, "The requested document is not old enough\n"); - ftp->no_transfer = TRUE; /* mark this to not transfer data */ - return CURLE_OK; - } - break; - } /* switch */ - } - else { - infof(data, "Skipping time comparison\n"); - } - } - break; - default: - return result; - } /* switch */ + if(ftpcode != 200) { + failf(data, "Couldn't set %s mode", + ascii?"ASCII":"binary"); + return ascii? CURLE_FTP_COULDNT_SET_ASCII:CURLE_FTP_COULDNT_SET_BINARY; } - /* If we have selected NOBODY and HEADER, it means that we only want file - information. Which in FTP can't be much more than the file size and - date. */ - if(conn->bits.no_body && data->set.include_header && ftp->file) { - /* The SIZE command is _not_ RFC 959 specified, and therefor many servers - may not support it! It is however the only way we have to get a file's - size! */ - curl_off_t filesize; - ssize_t nread; - int ftpcode; + return CURLE_OK; +} - ftp->no_transfer = TRUE; /* this means no actual transfer is made */ +/*************************************************************************** + * + * ftp_pasv_verbose() + * + * This function only outputs some informationals about this second connection + * when we've issued a PASV command before and thus we have connected to a + * possibly new IP address. + * + */ +static void +ftp_pasv_verbose(struct connectdata *conn, + Curl_addrinfo *ai, + char *newhost, /* ascii version */ + int port) +{ + char buf[256]; + Curl_printable_address(ai, buf, sizeof(buf)); + infof(conn->data, "Connecting to %s (%s) port %d\n", newhost, buf, port); +} - /* Some servers return different sizes for different modes, and thus we - must set the proper type before we check the size */ - result = ftp_transfertype(conn, data->set.ftp_ascii); - if(result) - return result; +/* + Check if this is a range download, and if so, set the internal variables + properly. + */ - /* failing to get size is not a serious error */ - result = ftp_getsize(conn, ftp->file, &filesize); +static CURLcode ftp_range(struct connectdata *conn) +{ + curl_off_t from, to; + curl_off_t totalsize=-1; + char *ptr; + char *ptr2; + struct SessionHandle *data = conn->data; + struct FTP *ftp = conn->proto.ftp; - if(CURLE_OK == result) { - snprintf(buf, sizeof(data->state.buffer), - "Content-Length: %" FORMAT_OFF_T "\r\n", filesize); - result = Curl_client_write(data, CLIENTWRITE_BOTH, buf, 0); - if(result) - return result; + if(conn->bits.use_range && conn->range) { + from=curlx_strtoofft(conn->range, &ptr, 0); + while(ptr && *ptr && (isspace((int)*ptr) || (*ptr=='-'))) + ptr++; + to=curlx_strtoofft(ptr, &ptr2, 0); + if(ptr == ptr2) { + /* we didn't get any digit */ + to=-1; + } + if((-1 == to) && (from>=0)) { + /* X - */ + conn->resume_from = from; + infof(data, "FTP RANGE %" FORMAT_OFF_T " to end of file\n", from); + } + else if(from < 0) { + /* -Y */ + totalsize = -from; + conn->maxdownload = -from; + conn->resume_from = from; + infof(data, "FTP RANGE the last %" FORMAT_OFF_T " bytes\n", totalsize); } + else { + /* X-Y */ + totalsize = to-from; + conn->maxdownload = totalsize+1; /* include the last mentioned byte */ + conn->resume_from = from; + infof(data, "FTP RANGE from %" FORMAT_OFF_T + " getting %" FORMAT_OFF_T " bytes\n", from, conn->maxdownload); + } + infof(data, "range-download from %" FORMAT_OFF_T + " to %" FORMAT_OFF_T ", totally %" FORMAT_OFF_T " bytes\n", + from, to, conn->maxdownload); + ftp->dont_check = TRUE; /* dont check for successful transfer */ + } + return CURLE_OK; +} - /* Determine if server can respond to REST command and therefore - whether it can do a range */ - FTPSENDF(conn, "REST 0", NULL); - result = Curl_GetFTPResponse(&nread, conn, &ftpcode); - if ((CURLE_OK == result) && (ftpcode == 350)) { - result = Curl_client_write(data, CLIENTWRITE_BOTH, - (char *)"Accept-ranges: bytes\r\n", 0); - if(result) - return result; - } +/* + * Curl_ftp_nextconnect() + * + * This function shall be called when the second FTP (data) connection is + * connected. + */ - /* If we asked for a time of the file and we actually got one as - well, we "emulate" a HTTP-style header in our output. */ +CURLcode Curl_ftp_nextconnect(struct connectdata *conn) +{ + struct SessionHandle *data=conn->data; + CURLcode result = CURLE_OK; -#ifdef HAVE_STRFTIME - if(data->set.get_filetime && (data->info.filetime>=0) ) { - struct tm *tm; - time_t clock = (time_t)data->info.filetime; -#ifdef HAVE_GMTIME_R - struct tm buffer; - tm = (struct tm *)gmtime_r(&clock, &buffer); -#else - tm = gmtime(&clock); -#endif - /* format: "Tue, 15 Nov 1994 12:45:26" */ - strftime(buf, BUFSIZE-1, "Last-Modified: %a, %d %b %Y %H:%M:%S GMT\r\n", - tm); - result = Curl_client_write(data, CLIENTWRITE_BOTH, buf, 0); - if(result) - return result; - } -#endif + /* the ftp struct is inited in Curl_ftp_connect() */ + struct FTP *ftp = conn->proto.ftp; - return CURLE_OK; - } + infof(data, "DO-MORE phase starts\n"); - if(conn->bits.no_body) - /* doesn't really transfer any data */ - ftp->no_transfer = TRUE; - /* Get us a second connection up and connected */ - else if(data->set.ftp_use_port) { - /* We have chosen to use the PORT command */ - result = ftp_use_port(conn); - if(CURLE_OK == result) { - /* we have the data connection ready */ - infof(data, "Ordered connect of the data stream with PORT!\n"); - *connected = TRUE; /* mark us "still connected" */ + if(!ftp->no_transfer && !conn->bits.no_body) { + /* a transfer is about to take place */ + + if(data->set.upload) { + NBFTPSENDF(conn, "TYPE %c", data->set.ftp_ascii?'A':'I'); + state(conn, FTP_STOR_TYPE); } + else { + /* download */ + ftp->downloadsize = -1; /* unknown as of yet */ + + result = ftp_range(conn); + if(result) + ; + else if((data->set.ftp_list_only) || !ftp->file) { + /* The specified path ends with a slash, and therefore we think this + is a directory that is requested, use LIST. But before that we + need to set ASCII transfer mode. */ + NBFTPSENDF(conn, "TYPE A", NULL); + state(conn, FTP_LIST_TYPE); + } + else { + NBFTPSENDF(conn, "TYPE %c", data->set.ftp_ascii?'A':'I'); + state(conn, FTP_RETR_TYPE); + } + } + result = ftp_easy_statemach(conn); } + + if(ftp->no_transfer) + /* no data to transfer. FIX: it feels like a kludge to have this here + too! */ + result=Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL); + + /* end of transfer */ + infof(data, "DO-MORE phase ends\n"); + + return result; +} + + + +/*********************************************************************** + * + * ftp_perform() + * + * This is the actual DO function for FTP. Get a file/directory according to + * the options previously setup. + */ + +static +CURLcode ftp_perform(struct connectdata *conn, + bool *connected, /* connect status after PASV / PORT */ + bool *dophase_done) +{ + /* this is FTP and no proxy */ + CURLcode result=CURLE_OK; + struct SessionHandle *data=conn->data; + + infof(data, "DO phase starts\n"); + + *dophase_done = FALSE; /* not done yet */ + + /* start the first command in the DO phase */ + result = ftp_state_quote(conn, TRUE, FTP_QUOTE); + if(result) + return result; + + /* run the state-machine */ + if(conn->data->state.used_interface == Curl_if_multi) + result = Curl_ftp_multi_statemach(conn, dophase_done); else { - /* We have chosen (this is default) to use the PASV command */ - result = ftp_use_pasv(conn, connected); - if(CURLE_OK == result && *connected) - infof(data, "Connected the data stream with PASV!\n"); + result = ftp_easy_statemach(conn); + *dophase_done = TRUE; /* with the easy interface we are done here */ } + *connected = conn->bits.tcpconnect; + + if(*dophase_done) + infof(data, "DO phase is comlete\n"); return result; } @@ -2335,31 +3153,89 @@ CURLcode ftp_perform(struct connectdata *conn, * * The input argument is already checked for validity. */ -CURLcode Curl_ftp(struct connectdata *conn) +CURLcode Curl_ftp(struct connectdata *conn, bool *done) { CURLcode retcode = CURLE_OK; + *done = FALSE; /* default to false */ + retcode = ftp_parse_url_path(conn); if (retcode) return retcode; - if (conn->sec_conn) /* 3rd party transfer */ + if (conn->sec_conn) { + /* 3rd party transfer */ + *done = TRUE; /* BLOCKING */ retcode = ftp_3rdparty(conn); + } else - retcode = ftp_regular_transfer(conn); + retcode = ftp_regular_transfer(conn, done); return retcode; } /*********************************************************************** * - * Curl_ftpsendf() + * Curl_(nb)ftpsendf() * * Sends the formated string as a ftp command to a ftp server * * NOTE: we build the command in a fixed-length buffer, which sets length * restrictions on the command! + * + * The "nb" version is made to Never Block. */ +CURLcode Curl_nbftpsendf(struct connectdata *conn, + const char *fmt, ...) +{ + ssize_t bytes_written; + char s[256]; + size_t write_len; + char *sptr=s; + CURLcode res = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + struct SessionHandle *data = conn->data; + + va_list ap; + va_start(ap, fmt); + vsnprintf(s, 250, fmt, ap); + va_end(ap); + + strcat(s, "\r\n"); /* append a trailing CRLF */ + + bytes_written=0; + write_len = strlen(s); + + res = Curl_write(conn, conn->sock[FIRSTSOCKET], sptr, write_len, + &bytes_written); + + if(CURLE_OK != res) + return res; + + if(conn->data->set.verbose) + Curl_debug(conn->data, CURLINFO_HEADER_OUT, sptr, bytes_written, + conn); + + if(bytes_written != (ssize_t)write_len) { + /* the whole chunk was not sent, store the rest of the data */ + write_len -= bytes_written; + sptr += bytes_written; + ftp->sendthis = malloc(write_len); + if(ftp->sendthis) { + memcpy(ftp->sendthis, sptr, write_len); + ftp->sendsize=ftp->sendleft=write_len; + } + else { + failf(data, "out of memory"); + res = CURLE_OUT_OF_MEMORY; + } + } + else + ftp->response = Curl_tvnow(); + + return res; +} + CURLcode Curl_ftpsendf(struct connectdata *conn, const char *fmt, ...) { @@ -2412,17 +3288,16 @@ CURLcode Curl_ftpsendf(struct connectdata *conn, */ static CURLcode ftp_quit(struct connectdata *conn) { - ssize_t nread; - int ftpcode; - CURLcode ret = CURLE_OK; + CURLcode result = CURLE_OK; if(conn->proto.ftp->ctl_valid) { - ret = Curl_ftpsendf(conn, "%s", "QUIT"); - if(CURLE_OK == ret) - ret = Curl_GetFTPResponse(&nread, conn, &ftpcode); + NBFTPSENDF(conn, "QUIT", NULL); + state(conn, FTP_QUIT); + + result = ftp_easy_statemach(conn); } - return ret; + return result; } /*********************************************************************** @@ -2430,7 +3305,7 @@ static CURLcode ftp_quit(struct connectdata *conn) * Curl_ftp_disconnect() * * Disconnect from an FTP server. Cleanup protocol-specific per-connection - * resources + * resources. BLOCKING. */ CURLcode Curl_ftp_disconnect(struct connectdata *conn) { @@ -2881,21 +3756,66 @@ CURLcode ftp_cwd_and_create_path(struct connectdata *conn) return result; } +/* call this when the DO phase has completed */ +static CURLcode ftp_dophase_done(struct connectdata *conn, + bool connected) +{ + CURLcode result = CURLE_OK; + struct FTP *ftp = conn->proto.ftp; + + if(connected) + result = Curl_ftp_nextconnect(conn); + + if(result && (conn->sock[SECONDARYSOCKET] != CURL_SOCKET_BAD)) { + /* Failure detected, close the second socket if it was created already */ + sclose(conn->sock[SECONDARYSOCKET]); + conn->sock[SECONDARYSOCKET] = CURL_SOCKET_BAD; + } + + if(ftp->no_transfer) + /* no data to transfer */ + result=Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL); + else if(!connected) + /* since we didn't connect now, we want do_more to get called */ + conn->bits.do_more = TRUE; + + ftp->ctl_valid = TRUE; /* seems good */ + + return result; +} + +/* called from multi.c while DOing */ +CURLcode Curl_ftp_doing(struct connectdata *conn, + bool *dophase_done) +{ + CURLcode result; + result = Curl_ftp_multi_statemach(conn, dophase_done); + + if(*dophase_done) { + result = ftp_dophase_done(conn, FALSE /* not connected */); + + infof(conn->data, "DO phase is comlete\n"); + } + return result; +} /*********************************************************************** * * ftp_regular_transfer() * * The input argument is already checked for validity. - * Performs a regular transfer between local and remote hosts. + * + * Performs all commands done before a regular transfer between a local and a + * remote host. * * ftp->ctl_valid starts out as FALSE, and gets set to TRUE if we reach the * Curl_ftp_done() function without finding any major problem. */ static -CURLcode ftp_regular_transfer(struct connectdata *conn) +CURLcode ftp_regular_transfer(struct connectdata *conn, + bool *dophase_done) { - CURLcode retcode=CURLE_OK; + CURLcode result=CURLE_OK; bool connected=0; struct SessionHandle *data = conn->data; struct FTP *ftp; @@ -2909,31 +3829,26 @@ CURLcode ftp_regular_transfer(struct connectdata *conn) Curl_pgrsSetUploadSize(data, 0); Curl_pgrsSetDownloadSize(data, 0); - retcode = ftp_perform(conn, &connected); + ftp->ctl_valid = TRUE; /* starts good */ - if(CURLE_OK == retcode) { - if(connected) - retcode = Curl_ftp_nextconnect(conn); + result = ftp_perform(conn, + &connected, /* have we connected after PASV/PORT */ + dophase_done); /* all commands in the DO-phase done? */ - if(retcode && (conn->sock[SECONDARYSOCKET] != CURL_SOCKET_BAD)) { - /* Failure detected, close the second socket if it was created already */ - sclose(conn->sock[SECONDARYSOCKET]); - conn->sock[SECONDARYSOCKET] = CURL_SOCKET_BAD; - } + if(CURLE_OK == result) { - if(ftp->no_transfer) - /* no data to transfer */ - retcode=Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL); - else if(!connected) - /* since we didn't connect now, we want do_more to get called */ - conn->bits.do_more = TRUE; + if(!*dophase_done) + /* the DO phase has not completed yet */ + return CURLE_OK; + + result = ftp_dophase_done(conn, connected); + if(result) + return result; } else freedirs(ftp); - ftp->ctl_valid = TRUE; /* seems good */ - - return retcode; + return result; } @@ -2947,16 +3862,16 @@ CURLcode ftp_regular_transfer(struct connectdata *conn) */ static CURLcode ftp_3rdparty(struct connectdata *conn) { - CURLcode retcode = CURLE_OK; + CURLcode result = CURLE_OK; conn->proto.ftp->ctl_valid = conn->sec_conn->proto.ftp->ctl_valid = TRUE; conn->size = conn->sec_conn->size = -1; - retcode = ftp_3rdparty_pretransfer(conn); - if (!retcode) - retcode = ftp_3rdparty_transfer(conn); + result = ftp_3rdparty_pretransfer(conn); + if (!result) + result = ftp_3rdparty_transfer(conn); - return retcode; + return result; } #endif /* CURL_DISABLE_FTP */ |