/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2019, Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ #include "curl_setup.h" #include "urldata.h" #include "urlapi-int.h" #include "strcase.h" #include "dotdot.h" #include "url.h" #include "escape.h" #include "curl_ctype.h" /* The last 3 #include files should be in this order */ #include "curl_printf.h" #include "curl_memory.h" #include "memdebug.h" /* MSDOS/Windows style drive prefix, eg c: in c:foo */ #define STARTS_WITH_DRIVE_PREFIX(str) \ ((('a' <= str[0] && str[0] <= 'z') || \ ('A' <= str[0] && str[0] <= 'Z')) && \ (str[1] == ':')) /* MSDOS/Windows style drive prefix, optionally with * a '|' instead of ':', followed by a slash or NUL */ #define STARTS_WITH_URL_DRIVE_PREFIX(str) \ ((('a' <= (str)[0] && (str)[0] <= 'z') || \ ('A' <= (str)[0] && (str)[0] <= 'Z')) && \ ((str)[1] == ':' || (str)[1] == '|') && \ ((str)[2] == '/' || (str)[2] == '\\' || (str)[2] == 0)) /* Internal representation of CURLU. Point to URL-encoded strings. */ struct Curl_URL { char *scheme; char *user; char *password; char *options; /* IMAP only? */ char *host; char *port; char *path; char *query; char *fragment; char *scratch; /* temporary scratch area */ long portnum; /* the numerical version */ }; #define DEFAULT_SCHEME "https" static void free_urlhandle(struct Curl_URL *u) { free(u->scheme); free(u->user); free(u->password); free(u->options); free(u->host); free(u->port); free(u->path); free(u->query); free(u->fragment); free(u->scratch); } /* move the full contents of one handle onto another and free the original */ static void mv_urlhandle(struct Curl_URL *from, struct Curl_URL *to) { free_urlhandle(to); *to = *from; free(from); } /* * Find the separator at the end of the host name, or the '?' in cases like * http://www.url.com?id=2380 */ static const char *find_host_sep(const char *url) { const char *sep; const char *query; /* Find the start of the hostname */ sep = strstr(url, "//"); if(!sep) sep = url; else sep += 2; query = strchr(sep, '?'); sep = strchr(sep, '/'); if(!sep) sep = url + strlen(url); if(!query) query = url + strlen(url); return sep < query ? sep : query; } /* * Decide in an encoding-independent manner whether a character in an * URL must be escaped. The same criterion must be used in strlen_url() * and strcpy_url(). */ static bool urlchar_needs_escaping(int c) { return !(ISCNTRL(c) || ISSPACE(c) || ISGRAPH(c)); } /* * strlen_url() returns the length of the given URL if the spaces within the * URL were properly URL encoded. * URL encoding should be skipped for host names, otherwise IDN resolution * will fail. */ static size_t strlen_url(const char *url, bool relative) { const unsigned char *ptr; size_t newlen = 0; bool left = TRUE; /* left side of the ? */ const unsigned char *host_sep = (const unsigned char *) url; if(!relative) host_sep = (const unsigned char *) find_host_sep(url); for(ptr = (unsigned char *)url; *ptr; ptr++) { if(ptr < host_sep) { ++newlen; continue; } switch(*ptr) { case '?': left = FALSE; /* FALLTHROUGH */ default: if(urlchar_needs_escaping(*ptr)) newlen += 2; newlen++; break; case ' ': if(left) newlen += 3; else newlen++; break; } } return newlen; } /* strcpy_url() copies a url to a output buffer and URL-encodes the spaces in * the source URL accordingly. * URL encoding should be skipped for host names, otherwise IDN resolution * will fail. */ static void strcpy_url(char *output, const char *url, bool relative) { /* we must add this with whitespace-replacing */ bool left = TRUE; const unsigned char *iptr; char *optr = output; const unsigned char *host_sep = (const unsigned char *) url; if(!relative) host_sep = (const unsigned char *) find_host_sep(url); for(iptr = (unsigned char *)url; /* read from here */ *iptr; /* until zero byte */ iptr++) { if(iptr < host_sep) { *optr++ = *iptr; continue; } switch(*iptr) { case '?': left = FALSE; /* FALLTHROUGH */ default: if(urlchar_needs_escaping(*iptr)) { msnprintf(optr, 4, "%%%02x", *iptr); optr += 3; } else *optr++=*iptr; break; case ' ': if(left) { *optr++='%'; /* add a '%' */ *optr++='2'; /* add a '2' */ *optr++='0'; /* add a '0' */ } else *optr++='+'; /* add a '+' here */ break; } } *optr = 0; /* zero terminate output buffer */ } /* * Returns true if the given URL is absolute (as opposed to relative) within * the buffer size. Returns the scheme in the buffer if TRUE and 'buf' is * non-NULL. */ bool Curl_is_absolute_url(const char *url, char *buf, size_t buflen) { size_t i; #ifdef WIN32 if(STARTS_WITH_DRIVE_PREFIX(url)) return FALSE; #endif for(i = 0; i < buflen && url[i]; ++i) { char s = url[i]; if((s == ':') && (url[i + 1] == '/')) { if(buf) buf[i] = 0; return TRUE; } /* RFC 3986 3.1 explains: scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) */ else if(ISALNUM(s) || (s == '+') || (s == '-') || (s == '.') ) { if(buf) buf[i] = (char)TOLOWER(s); } else break; } return FALSE; } /* * Concatenate a relative URL to a base URL making it absolute. * URL-encodes any spaces. * The returned pointer must be freed by the caller unless NULL * (returns NULL on out of memory). */ static char *concat_url(const char *base, const char *relurl) { /*** TRY to append this new path to the old URL to the right of the host part. Oh crap, this is doomed to cause problems in the future... */ char *newest; char *protsep; char *pathsep; size_t newlen; bool host_changed = FALSE; const char *useurl = relurl; size_t urllen; /* we must make our own copy of the URL to play with, as it may point to read-only data */ char *url_clone = strdup(base); if(!url_clone) return NULL; /* skip out of this NOW */ /* protsep points to the start of the host name */ protsep = strstr(url_clone, "//"); if(!protsep) protsep = url_clone; else protsep += 2; /* pass the slashes */ if('/' != relurl[0]) { int level = 0; /* First we need to find out if there's a ?-letter in the URL, and cut it and the right-side of that off */ pathsep = strchr(protsep, '?'); if(pathsep) *pathsep = 0; /* we have a relative path to append to the last slash if there's one available, or if the new URL is just a query string (starts with a '?') we append the new one at the end of the entire currently worked out URL */ if(useurl[0] != '?') { pathsep = strrchr(protsep, '/'); if(pathsep) *pathsep = 0; } /* Check if there's any slash after the host name, and if so, remember that position instead */ pathsep = strchr(protsep, '/'); if(pathsep) protsep = pathsep + 1; else protsep = NULL; /* now deal with one "./" or any amount of "../" in the newurl and act accordingly */ if((useurl[0] == '.') && (useurl[1] == '/')) useurl += 2; /* just skip the "./" */ while((useurl[0] == '.') && (useurl[1] == '.') && (useurl[2] == '/')) { level++; useurl += 3; /* pass the "../" */ } if(protsep) { while(level--) { /* cut off one more level from the right of the original URL */ pathsep = strrchr(protsep, '/'); if(pathsep) *pathsep = 0; else { *protsep = 0; break; } } } } else { /* We got a new absolute path for this server */ if((relurl[0] == '/') && (relurl[1] == '/')) { /* the new URL starts with //, just keep the protocol part from the original one */ *protsep = 0; useurl = &relurl[2]; /* we keep the slashes from the original, so we skip the new ones */ host_changed = TRUE; } else { /* cut off the original URL from the first slash, or deal with URLs without slash */ pathsep = strchr(protsep, '/'); if(pathsep) { /* When people use badly formatted URLs, such as "http://www.url.com?dir=/home/daniel" we must not use the first slash, if there's a ?-letter before it! */ char *sep = strchr(protsep, '?'); if(sep && (sep < pathsep)) pathsep = sep; *pathsep = 0; } else { /* There was no slash. Now, since we might be operating on a badly formatted URL, such as "http://www.url.com?id=2380" which doesn't use a slash separator as it is supposed to, we need to check for a ?-letter as well! */ pathsep = strchr(protsep, '?'); if(pathsep) *pathsep = 0; } } } /* If the new part contains a space, this is a mighty stupid redirect but we still make an effort to do "right". To the left of a '?' letter we replace each space with %20 while it is replaced with '+' on the right side of the '?' letter. */ newlen = strlen_url(useurl, !host_changed); urllen = strlen(url_clone); newest = malloc(urllen + 1 + /* possible slash */ newlen + 1 /* zero byte */); if(!newest) { free(url_clone); /* don't leak this */ return NULL; } /* copy over the root url part */ memcpy(newest, url_clone, urllen); /* check if we need to append a slash */ if(('/' == useurl[0]) || (protsep && !*protsep) || ('?' == useurl[0])) ; else newest[urllen++]='/'; /* then append the new piece on the right side */ strcpy_url(&newest[urllen], useurl, !host_changed); free(url_clone); return newest; } /* * parse_hostname_login() * * Parse the login details (user name, password and options) from the URL and * strip them out of the host name * */ static CURLUcode parse_hostname_login(struct Curl_URL *u, const struct Curl_handler *h, char **hostname, unsigned int flags) { CURLUcode result = CURLUE_OK; CURLcode ccode; char *userp = NULL; char *passwdp = NULL; char *optionsp = NULL; /* At this point, we're hoping all the other special cases have * been taken care of, so conn->host.name is at most * [user[:password][;options]]@]hostname * * We need somewhere to put the embedded details, so do that first. */ char *ptr = strchr(*hostname, '@'); char *login = *hostname; if(!ptr) goto out; /* We will now try to extract the * possible login information in a string like: * ftp://user:password@ftp.my.site:8021/README */ *hostname = ++ptr; /* We could use the login information in the URL so extract it. Only parse options if the handler says we should. Note that 'h' might be NULL! */ ccode = Curl_parse_login_details(login, ptr - login - 1, &userp, &passwdp, (h && (h->flags & PROTOPT_URLOPTIONS)) ? &optionsp:NULL); if(ccode) { result = CURLUE_MALFORMED_INPUT; goto out; } if(userp) { if(flags & CURLU_DISALLOW_USER) { /* Option DISALLOW_USER is set and url contains username. */ result = CURLUE_USER_NOT_ALLOWED; goto out; } u->user = userp; } if(passwdp) u->password = passwdp; if(optionsp) u->options = optionsp; return CURLUE_OK; out: free(userp); free(passwdp); free(optionsp); return result; } UNITTEST CURLUcode Curl_parse_port(struct Curl_URL *u, char *hostname) { char *portptr = NULL; char endbracket; int len; /* * Find the end of an IPv6 address, either on the ']' ending bracket or * a percent-encoded zone index. */ if(1 == sscanf(hostname, "[%*45[0123456789abcdefABCDEF:.]%c%n", &endbracket, &len)) { if(']' == endbracket) portptr = &hostname[len]; else if('%' == endbracket) { int zonelen = len; if(1 == sscanf(hostname + zonelen, "25%*[^]]%c%n", &endbracket, &len)) { if(']' != endbracket) return CURLUE_MALFORMED_INPUT; portptr = &hostname[--zonelen + len + 1]; } else return CURLUE_MALFORMED_INPUT; } else return CURLUE_MALFORMED_INPUT; /* this is a RFC2732-style specified IP-address */ if(portptr && *portptr) { if(*portptr != ':') return CURLUE_MALFORMED_INPUT; } else portptr = NULL; } else portptr = strchr(hostname, ':'); if(portptr) { char *rest; long port; char portbuf[7]; /* Browser behavior adaptation. If there's a colon with no digits after, just cut off the name there which makes us ignore the colon and just use the default port. Firefox, Chrome and Safari all do that. */ if(!portptr[1]) { *portptr = '\0'; return CURLUE_OK; } if(!ISDIGIT(portptr[1])) return CURLUE_BAD_PORT_NUMBER; port = strtol(portptr + 1, &rest, 10); /* Port number must be decimal */ if((port <= 0) || (port > 0xffff)) /* Single unix standard says port numbers are 16 bits long, but we don't treat port zero as OK. */ return CURLUE_BAD_PORT_NUMBER; if(rest[0]) return CURLUE_BAD_PORT_NUMBER; *portptr++ = '\0'; /* cut off the name there */ *rest = 0; /* generate a new port number string to get rid of leading zeroes etc */ msnprintf(portbuf, sizeof(portbuf), "%ld", port); u->portnum = port; u->port = strdup(portbuf); if(!u->port) return CURLUE_OUT_OF_MEMORY; } return CURLUE_OK; } /* scan for byte values < 31 or 127 */ static CURLUcode junkscan(char *part) { if(part) { static const char badbytes[]={ /* */ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x7f, 0x00 /* zero terminate */ }; size_t n = strlen(part); size_t nfine = strcspn(part, badbytes); if(nfine != n) /* since we don't know which part is scanned, return a generic error code */ return CURLUE_MALFORMED_INPUT; } return CURLUE_OK; } static CURLUcode hostname_check(char *hostname, unsigned int flags) { const char *l = NULL; /* accepted characters */ size_t len; size_t hlen = strlen(hostname); (void)flags; if(hostname[0] == '[') { hostname++; l = "0123456789abcdefABCDEF::.%"; hlen -= 2; } if(l) { /* only valid letters are ok */ len = strspn(hostname, l); if(hlen != len) /* hostname with bad content */ return CURLUE_MALFORMED_INPUT; } else { /* letters from the second string is not ok */ len = strcspn(hostname, " "); if(hlen != len) /* hostname with bad content */ return CURLUE_MALFORMED_INPUT; } return CURLUE_OK; } #define HOSTNAME_END(x) (((x) == '/') || ((x) == '?') || ((x) == '#')) static CURLUcode seturl(const char *url, CURLU *u, unsigned int flags) { char *path; bool path_alloced = FALSE; char *hostname; char *query = NULL; char *fragment = NULL; CURLUcode result; bool url_has_scheme = FALSE; char schemebuf[MAX_SCHEME_LEN]; char *schemep = NULL; size_t schemelen = 0; size_t urllen; const struct Curl_handler *h = NULL; if(!url) return CURLUE_MALFORMED_INPUT; /************************************************************* * Parse the URL. ************************************************************/ /* allocate scratch area */ urllen = strlen(url); if(urllen > CURL_MAX_INPUT_LENGTH) /* excessive input length */ return CURLUE_MALFORMED_INPUT; path = u->scratch = malloc(urllen * 2 + 2); if(!path) return CURLUE_OUT_OF_MEMORY; hostname = &path[urllen + 1]; hostname[0] = 0; if(Curl_is_absolute_url(url, schemebuf, sizeof(schemebuf))) { url_has_scheme = TRUE; schemelen = strlen(schemebuf); } /* handle the file: scheme */ if(url_has_scheme && strcasecompare(schemebuf, "file")) { /* path has been allocated large enough to hold this */ strcpy(path, &url[5]); hostname = NULL; /* no host for file: URLs */ u->scheme = strdup("file"); if(!u->scheme) return CURLUE_OUT_OF_MEMORY; /* Extra handling URLs with an authority component (i.e. that start with * "file://") * * We allow omitted hostname (e.g. file:/) -- valid according to * RFC 8089, but not the (current) WHAT-WG URL spec. */ if(path[0] == '/' && path[1] == '/') { /* swallow the two slashes */ char *ptr = &path[2]; /* * According to RFC 8089, a file: URL can be reliably dereferenced if: * * o it has no/blank hostname, or * * o the hostname matches "localhost" (case-insensitively), or * * o the hostname is a FQDN that resolves to this machine. * * For brevity, we only consider URLs with empty, "localhost", or * "127.0.0.1" hostnames as local. * * Additionally, there is an exception for URLs with a Windows drive * letter in the authority (which was accidentally omitted from RFC 8089 * Appendix E, but believe me, it was meant to be there. --MK) */ if(ptr[0] != '/' && !STARTS_WITH_URL_DRIVE_PREFIX(ptr)) { /* the URL includes a host name, it must match "localhost" or "127.0.0.1" to be valid */ if(!checkprefix("localhost/", ptr) && !checkprefix("127.0.0.1/", ptr)) { /* Invalid file://hostname/, expected localhost or 127.0.0.1 or none */ return CURLUE_MALFORMED_INPUT; } ptr += 9; /* now points to the slash after the host */ } path = ptr; } #if !defined(MSDOS) && !defined(WIN32) && !defined(__CYGWIN__) /* Don't allow Windows drive letters when not in Windows. * This catches both "file:/c:" and "file:c:" */ if(('/' == path[0] && STARTS_WITH_URL_DRIVE_PREFIX(&path[1])) || STARTS_WITH_URL_DRIVE_PREFIX(path)) { /* File drive letters are only accepted in MSDOS/Windows */ return CURLUE_MALFORMED_INPUT; } #else /* If the path starts with a slash and a drive letter, ditch the slash */ if('/' == path[0] && STARTS_WITH_URL_DRIVE_PREFIX(&path[1])) { /* This cannot be done with strcpy, as the memory chunks overlap! */ memmove(path, &path[1], strlen(&path[1]) + 1); } #endif } else { /* clear path */ const char *p; const char *hostp; size_t len; path[0] = 0; if(url_has_scheme) { int i = 0; p = &url[schemelen + 1]; while(p && (*p == '/') && (i < 4)) { p++; i++; } if((i < 1) || (i>3)) /* less than one or more than three slashes */ return CURLUE_MALFORMED_INPUT; schemep = schemebuf; if(!Curl_builtin_scheme(schemep) && !(flags & CURLU_NON_SUPPORT_SCHEME)) return CURLUE_UNSUPPORTED_SCHEME; if(junkscan(schemep)) return CURLUE_MALFORMED_INPUT; } else { /* no scheme! */ if(!(flags & (CURLU_DEFAULT_SCHEME|CURLU_GUESS_SCHEME))) return CURLUE_MALFORMED_INPUT; if(flags & CURLU_DEFAULT_SCHEME) schemep = (char *) DEFAULT_SCHEME; /* * The URL was badly formatted, let's try without scheme specified. */ p = url; } hostp = p; /* host name starts here */ while(*p && !HOSTNAME_END(*p)) /* find end of host name */ p++; len = p - hostp; if(!len) return CURLUE_MALFORMED_INPUT; memcpy(hostname, hostp, len); hostname[len] = 0; if((flags & CURLU_GUESS_SCHEME) && !schemep) { /* legacy curl-style guess based on host name */ if(checkprefix("ftp.", hostname)) schemep = (char *)"ftp"; else if(checkprefix("dict.", hostname)) schemep = (char *)"dict"; else if(checkprefix("ldap.", hostname)) schemep = (char *)"ldap"; else if(checkprefix("imap.", hostname)) schemep = (char *)"imap"; else if(checkprefix("smtp.", hostname)) schemep = (char *)"smtp"; else if(checkprefix("pop3.", hostname)) schemep = (char *)"pop3"; else schemep = (char *)"http"; } len = strlen(p); memcpy(path, p, len); path[len] = 0; u->scheme = strdup(schemep); if(!u->scheme) return CURLUE_OUT_OF_MEMORY; } /* if this is a known scheme, get some details */ h = Curl_builtin_scheme(u->scheme); if(junkscan(path)) return CURLUE_MALFORMED_INPUT; query = strchr(path, '?'); if(query) *query++ = 0; fragment = strchr(query?query:path, '#'); if(fragment) *fragment++ = 0; if(!path[0]) /* if there's no path set, unset */ path = NULL; else if(!(flags & CURLU_PATH_AS_IS)) { /* sanitise paths and remove ../ and ./ sequences according to RFC3986 */ char *newp = Curl_dedotdotify(path); if(!newp) return CURLUE_OUT_OF_MEMORY; if(strcmp(newp, path)) { /* if we got a new version */ path = newp; path_alloced = TRUE; } else free(newp); } if(path) { u->path = path_alloced?path:strdup(path); if(!u->path) return CURLUE_OUT_OF_MEMORY; } if(hostname) { /* * Parse the login details and strip them out of the host name. */ if(junkscan(hostname)) return CURLUE_MALFORMED_INPUT; result = parse_hostname_login(u, h, &hostname, flags); if(result) return result; result = Curl_parse_port(u, hostname); if(result) return result; result = hostname_check(hostname, flags); if(result) return result; u->host = strdup(hostname); if(!u->host) return CURLUE_OUT_OF_MEMORY; } if(query) { u->query = strdup(query); if(!u->query) return CURLUE_OUT_OF_MEMORY; } if(fragment && fragment[0]) { u->fragment = strdup(fragment); if(!u->fragment) return CURLUE_OUT_OF_MEMORY; } free(u->scratch); u->scratch = NULL; return CURLUE_OK; } /* * Parse the URL and set the relevant members of the Curl_URL struct. */ static CURLUcode parseurl(const char *url, CURLU *u, unsigned int flags) { CURLUcode result = seturl(url, u, flags); if(result) { free_urlhandle(u); memset(u, 0, sizeof(struct Curl_URL)); } return result; } /* */ CURLU *curl_url(void) { return calloc(sizeof(struct Curl_URL), 1); } void curl_url_cleanup(CURLU *u) { if(u) { free_urlhandle(u); free(u); } } #define DUP(dest, src, name) \ if(src->name) { \ dest->name = strdup(src->name); \ if(!dest->name) \ goto fail; \ } CURLU *curl_url_dup(CURLU *in) { struct Curl_URL *u = calloc(sizeof(struct Curl_URL), 1); if(u) { DUP(u, in, scheme); DUP(u, in, user); DUP(u, in, password); DUP(u, in, options); DUP(u, in, host); DUP(u, in, port); DUP(u, in, path); DUP(u, in, query); DUP(u, in, fragment); u->portnum = in->portnum; } return u; fail: curl_url_cleanup(u); return NULL; } CURLUcode curl_url_get(CURLU *u, CURLUPart what, char **part, unsigned int flags) { char *ptr; CURLUcode ifmissing = CURLUE_UNKNOWN_PART; char portbuf[7]; bool urldecode = (flags & CURLU_URLDECODE)?1:0; bool plusdecode = FALSE; (void)flags; if(!u) return CURLUE_BAD_HANDLE; if(!part) return CURLUE_BAD_PARTPOINTER; *part = NULL; switch(what) { case CURLUPART_SCHEME: ptr = u->scheme; ifmissing = CURLUE_NO_SCHEME; urldecode = FALSE; /* never for schemes */ break; case CURLUPART_USER: ptr = u->user; ifmissing = CURLUE_NO_USER; break; case CURLUPART_PASSWORD: ptr = u->password; ifmissing = CURLUE_NO_PASSWORD; break; case CURLUPART_OPTIONS: ptr = u->options; ifmissing = CURLUE_NO_OPTIONS; break; case CURLUPART_HOST: ptr = u->host; ifmissing = CURLUE_NO_HOST; break; case CURLUPART_PORT: ptr = u->port; ifmissing = CURLUE_NO_PORT; urldecode = FALSE; /* never for port */ if(!ptr && (flags & CURLU_DEFAULT_PORT) && u->scheme) { /* there's no stored port number, but asked to deliver a default one for the scheme */ const struct Curl_handler *h = Curl_builtin_scheme(u->scheme); if(h) { msnprintf(portbuf, sizeof(portbuf), "%ld", h->defport); ptr = portbuf; } } else if(ptr && u->scheme) { /* there is a stored port number, but ask to inhibit if it matches the default one for the scheme */ const struct Curl_handler *h = Curl_builtin_scheme(u->scheme); if(h && (h->defport == u->portnum) && (flags & CURLU_NO_DEFAULT_PORT)) ptr = NULL; } break; case CURLUPART_PATH: ptr = u->path; if(!ptr) { ptr = u->path = strdup("/"); if(!u->path) return CURLUE_OUT_OF_MEMORY; } break; case CURLUPART_QUERY: ptr = u->query; ifmissing = CURLUE_NO_QUERY; plusdecode = urldecode; break; case CURLUPART_FRAGMENT: ptr = u->fragment; ifmissing = CURLUE_NO_FRAGMENT; break; case CURLUPART_URL: { char *url; char *scheme; char *options = u->options; char *port = u->port; if(u->scheme && strcasecompare("file", u->scheme)) { url = aprintf("file://%s%s%s", u->path, u->fragment? "#": "", u->fragment? u->fragment : ""); } else if(!u->host) return CURLUE_NO_HOST; else { const struct Curl_handler *h = NULL; if(u->scheme) scheme = u->scheme; else if(flags & CURLU_DEFAULT_SCHEME) scheme = (char *) DEFAULT_SCHEME; else return CURLUE_NO_SCHEME; if(scheme) { h = Curl_builtin_scheme(scheme); if(!port && (flags & CURLU_DEFAULT_PORT)) { /* there's no stored port number, but asked to deliver a default one for the scheme */ if(h) { msnprintf(portbuf, sizeof(portbuf), "%ld", h->defport); port = portbuf; } } else if(port) { /* there is a stored port number, but asked to inhibit if it matches the default one for the scheme */ if(h && (h->defport == u->portnum) && (flags & CURLU_NO_DEFAULT_PORT)) port = NULL; } } if(h && !(h->flags & PROTOPT_URLOPTIONS)) options = NULL; url = aprintf("%s://%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", scheme, u->user ? u->user : "", u->password ? ":": "", u->password ? u->password : "", options ? ";" : "", options ? options : "", (u->user || u->password || options) ? "@": "", u->host, port ? ":": "", port ? port : "", (u->path && (u->path[0] != '/')) ? "/": "", u->path ? u->path : "/", (u->query && u->query[0]) ? "?": "", (u->query && u->query[0]) ? u->query : "", u->fragment? "#": "", u->fragment? u->fragment : ""); } if(!url) return CURLUE_OUT_OF_MEMORY; *part = url; return CURLUE_OK; } default: ptr = NULL; break; } if(ptr) { *part = strdup(ptr); if(!*part) return CURLUE_OUT_OF_MEMORY; if(plusdecode) { /* convert + to space */ char *plus; for(plus = *part; *plus; ++plus) { if(*plus == '+') *plus = ' '; } } if(urldecode) { char *decoded; size_t dlen; CURLcode res = Curl_urldecode(NULL, *part, 0, &decoded, &dlen, TRUE); free(*part); if(res) { *part = NULL; return CURLUE_URLDECODE; } *part = decoded; } return CURLUE_OK; } else return ifmissing; } CURLUcode curl_url_set(CURLU *u, CURLUPart what, const char *part, unsigned int flags) { char **storep = NULL; long port = 0; bool urlencode = (flags & CURLU_URLENCODE)? 1 : 0; bool plusencode = FALSE; bool urlskipslash = FALSE; bool appendquery = FALSE; bool equalsencode = FALSE; if(!u) return CURLUE_BAD_HANDLE; if(!part) { /* setting a part to NULL clears it */ switch(what) { case CURLUPART_URL: break; case CURLUPART_SCHEME: storep = &u->scheme; break; case CURLUPART_USER: storep = &u->user; break; case CURLUPART_PASSWORD: storep = &u->password; break; case CURLUPART_OPTIONS: storep = &u->options; break; case CURLUPART_HOST: storep = &u->host; break; case CURLUPART_PORT: u->portnum = 0; storep = &u->port; break; case CURLUPART_PATH: storep = &u->path; break; case CURLUPART_QUERY: storep = &u->query; break; case CURLUPART_FRAGMENT: storep = &u->fragment; break; default: return CURLUE_UNKNOWN_PART; } if(storep && *storep) { free(*storep); *storep = NULL; } return CURLUE_OK; } switch(what) { case CURLUPART_SCHEME: if(!(flags & CURLU_NON_SUPPORT_SCHEME) && /* verify that it is a fine scheme */ !Curl_builtin_scheme(part)) return CURLUE_UNSUPPORTED_SCHEME; storep = &u->scheme; urlencode = FALSE; /* never */ break; case CURLUPART_USER: storep = &u->user; break; case CURLUPART_PASSWORD: storep = &u->password; break; case CURLUPART_OPTIONS: storep = &u->options; break; case CURLUPART_HOST: storep = &u->host; break; case CURLUPART_PORT: { char *endp; urlencode = FALSE; /* never */ port = strtol(part, &endp, 10); /* Port number must be decimal */ if((port <= 0) || (port > 0xffff)) return CURLUE_BAD_PORT_NUMBER; if(*endp) /* weirdly provided number, not good! */ return CURLUE_MALFORMED_INPUT; storep = &u->port; } break; case CURLUPART_PATH: urlskipslash = TRUE; storep = &u->path; break; case CURLUPART_QUERY: plusencode = urlencode; appendquery = (flags & CURLU_APPENDQUERY)?1:0; equalsencode = appendquery; storep = &u->query; break; case CURLUPART_FRAGMENT: storep = &u->fragment; break; case CURLUPART_URL: { /* * Allow a new URL to replace the existing (if any) contents. * * If the existing contents is enough for a URL, allow a relative URL to * replace it. */ CURLUcode result; char *oldurl; char *redired_url; CURLU *handle2; if(Curl_is_absolute_url(part, NULL, MAX_SCHEME_LEN)) { handle2 = curl_url(); if(!handle2) return CURLUE_OUT_OF_MEMORY; result = parseurl(part, handle2, flags); if(!result) mv_urlhandle(handle2, u); else curl_url_cleanup(handle2); return result; } /* extract the full "old" URL to do the redirect on */ result = curl_url_get(u, CURLUPART_URL, &oldurl, flags); if(result) { /* couldn't get the old URL, just use the new! */ handle2 = curl_url(); if(!handle2) return CURLUE_OUT_OF_MEMORY; result = parseurl(part, handle2, flags); if(!result) mv_urlhandle(handle2, u); else curl_url_cleanup(handle2); return result; } /* apply the relative part to create a new URL */ redired_url = concat_url(oldurl, part); free(oldurl); if(!redired_url) return CURLUE_OUT_OF_MEMORY; /* now parse the new URL */ handle2 = curl_url(); if(!handle2) { free(redired_url); return CURLUE_OUT_OF_MEMORY; } result = parseurl(redired_url, handle2, flags); free(redired_url); if(!result) mv_urlhandle(handle2, u); else curl_url_cleanup(handle2); return result; } default: return CURLUE_UNKNOWN_PART; } if(storep) { const char *newp = part; size_t nalloc = strlen(part); if(nalloc > CURL_MAX_INPUT_LENGTH) /* excessive input length */ return CURLUE_MALFORMED_INPUT; if(urlencode) { const unsigned char *i; char *o; bool free_part = FALSE; char *enc = malloc(nalloc * 3 + 1); /* for worst case! */ if(!enc) return CURLUE_OUT_OF_MEMORY; if(plusencode) { /* space to plus */ i = (const unsigned char *)part; for(o = enc; *i; ++o, ++i) *o = (*i == ' ') ? '+' : *i; *o = 0; /* zero terminate */ part = strdup(enc); if(!part) { free(enc); return CURLUE_OUT_OF_MEMORY; } free_part = TRUE; } for(i = (const unsigned char *)part, o = enc; *i; i++) { if(Curl_isunreserved(*i) || ((*i == '/') && urlskipslash) || ((*i == '=') && equalsencode) || ((*i == '+') && plusencode)) { if((*i == '=') && equalsencode) /* only skip the first equals sign */ equalsencode = FALSE; *o = *i; o++; } else { msnprintf(o, 4, "%%%02x", *i); o += 3; } } *o = 0; /* zero terminate */ newp = enc; if(free_part) free((char *)part); } else { char *p; newp = strdup(part); if(!newp) return CURLUE_OUT_OF_MEMORY; p = (char *)newp; while(*p) { /* make sure percent encoded are lower case */ if((*p == '%') && ISXDIGIT(p[1]) && ISXDIGIT(p[2]) && (ISUPPER(p[1]) || ISUPPER(p[2]))) { p[1] = (char)TOLOWER(p[1]); p[2] = (char)TOLOWER(p[2]); p += 3; } else p++; } } if(appendquery) { /* Append the string onto the old query. Add a '&' separator if none is present at the end of the exsting query already */ size_t querylen = u->query ? strlen(u->query) : 0; bool addamperand = querylen && (u->query[querylen -1] != '&'); if(querylen) { size_t newplen = strlen(newp); char *p = malloc(querylen + addamperand + newplen + 1); if(!p) { free((char *)newp); return CURLUE_OUT_OF_MEMORY; } strcpy(p, u->query); /* original query */ if(addamperand) p[querylen] = '&'; /* ampersand */ strcpy(&p[querylen + addamperand], newp); /* new suffix */ free((char *)newp); free(*storep); *storep = p; return CURLUE_OK; } } free(*storep); *storep = (char *)newp; } /* set after the string, to make it not assigned if the allocation above fails */ if(port) u->portnum = port; return CURLUE_OK; }