/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, 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 http://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. * * $Id$ ***************************************************************************/ #include "setup.h" #ifndef CURL_DISABLE_TFTP /* -- WIN32 approved -- */ #include <stdio.h> #include <stdarg.h> #include <stdlib.h> #include <ctype.h> #if defined(WIN32) #include <time.h> #include <io.h> #else #ifdef HAVE_SYS_SOCKET_H #include <sys/socket.h> #endif #include <netinet/in.h> #ifdef HAVE_SYS_TIME_H #include <sys/time.h> #endif #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #include <netdb.h> #ifdef HAVE_ARPA_INET_H #include <arpa/inet.h> #endif #ifdef HAVE_NET_IF_H #include <net/if.h> #endif #ifdef HAVE_SYS_IOCTL_H #include <sys/ioctl.h> #endif #ifdef HAVE_SYS_PARAM_H #include <sys/param.h> #endif #endif /* WIN32 */ #include "urldata.h" #include <curl/curl.h> #include "transfer.h" #include "sendf.h" #include "tftp.h" #include "progress.h" #include "connect.h" #include "strerror.h" #include "sockaddr.h" /* required for Curl_sockaddr_storage */ #include "multiif.h" #include "url.h" #include "rawstr.h" #define _MPRINTF_REPLACE /* use our functions only */ #include <curl/mprintf.h> #include "curl_memory.h" #include "select.h" /* The last #include file should be: */ #include "memdebug.h" /* RFC2348 allows the block size to be negotiated */ #define TFTP_BLKSIZE_DEFAULT 512 #define TFTP_BLKSIZE_MIN 8 #define TFTP_BLKSIZE_MAX 65464 #define TFTP_OPTION_BLKSIZE "blksize" #define TFTP_OPTION_TSIZE "tsize" #define TFTP_OPTION_INTERVAL "interval" typedef enum { TFTP_MODE_NETASCII=0, TFTP_MODE_OCTET } tftp_mode_t; typedef enum { TFTP_STATE_START=0, TFTP_STATE_RX, TFTP_STATE_TX, TFTP_STATE_FIN } tftp_state_t; typedef enum { TFTP_EVENT_NONE = -1, TFTP_EVENT_INIT = 0, TFTP_EVENT_RRQ = 1, TFTP_EVENT_WRQ = 2, TFTP_EVENT_DATA = 3, TFTP_EVENT_ACK = 4, TFTP_EVENT_ERROR = 5, TFTP_EVENT_OACK = 6, TFTP_EVENT_TIMEOUT } tftp_event_t; typedef enum { TFTP_ERR_UNDEF=0, TFTP_ERR_NOTFOUND, TFTP_ERR_PERM, TFTP_ERR_DISKFULL, TFTP_ERR_ILLEGAL, TFTP_ERR_UNKNOWNID, TFTP_ERR_EXISTS, TFTP_ERR_NOSUCHUSER, /* This will never be triggered by this code */ /* The remaining error codes are internal to curl */ TFTP_ERR_NONE = -100, TFTP_ERR_TIMEOUT, TFTP_ERR_NORESPONSE } tftp_error_t; typedef struct tftp_packet { unsigned char *data; } tftp_packet_t; typedef struct tftp_state_data { tftp_state_t state; tftp_mode_t mode; tftp_error_t error; tftp_event_t event; struct connectdata *conn; curl_socket_t sockfd; int retries; int retry_time; int retry_max; time_t start_time; time_t max_time; time_t rx_time; unsigned short block; struct Curl_sockaddr_storage local_addr; struct Curl_sockaddr_storage remote_addr; curl_socklen_t remote_addrlen; int rbytes; int sbytes; int blksize; int requested_blksize; tftp_packet_t rpacket; tftp_packet_t spacket; } tftp_state_data_t; /* Forward declarations */ static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event) ; static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event) ; static CURLcode tftp_connect(struct connectdata *conn, bool *done); static CURLcode tftp_disconnect(struct connectdata *conn); static CURLcode tftp_do(struct connectdata *conn, bool *done); static CURLcode tftp_done(struct connectdata *conn, CURLcode, bool premature); static CURLcode tftp_setup_connection(struct connectdata * conn); static CURLcode tftp_multi_statemach(struct connectdata *conn, bool *done); static CURLcode tftp_doing(struct connectdata *conn, bool *dophase_done); static int tftp_getsock(struct connectdata *conn, curl_socket_t *socks, int numsocks); CURLcode tftp_translate_code(tftp_error_t error); /* * TFTP protocol handler. */ const struct Curl_handler Curl_handler_tftp = { "TFTP", /* scheme */ tftp_setup_connection, /* setup_connection */ tftp_do, /* do_it */ tftp_done, /* done */ ZERO_NULL, /* do_more */ tftp_connect, /* connect_it */ tftp_multi_statemach, /* connecting */ tftp_doing, /* doing */ tftp_getsock, /* proto_getsock */ tftp_getsock, /* doing_getsock */ ZERO_NULL, /* perform_getsock */ tftp_disconnect, /* disconnect */ PORT_TFTP, /* defport */ PROT_TFTP /* protocol */ }; /********************************************************** * * tftp_set_timeouts - * * Set timeouts based on state machine state. * Use user provided connect timeouts until DATA or ACK * packet is received, then use user-provided transfer timeouts * * **********************************************************/ static CURLcode tftp_set_timeouts(tftp_state_data_t *state) { time_t maxtime, timeout; long timeout_ms; bool start = (bool)(state->state == TFTP_STATE_START); time(&state->start_time); /* Compute drop-dead time */ timeout_ms = Curl_timeleft(state->conn, NULL, start); if(timeout_ms < 0) { /* time-out, bail out, go home */ failf(state->conn->data, "Connection time-out"); return CURLE_OPERATION_TIMEDOUT; } if(start) { maxtime = (time_t)(timeout_ms + 500) / 1000; state->max_time = state->start_time+maxtime; /* Set per-block timeout to total */ timeout = maxtime ; /* Average restart after 5 seconds */ state->retry_max = (int)timeout/5; if(state->retry_max < 1) /* avoid division by zero below */ state->retry_max = 1; /* Compute the re-start interval to suit the timeout */ state->retry_time = (int)timeout/state->retry_max; if(state->retry_time<1) state->retry_time=1; } else { if(timeout_ms > 0) maxtime = (time_t)(timeout_ms + 500) / 1000; else maxtime = 3600; state->max_time = state->start_time+maxtime; /* Set per-block timeout to 10% of total */ timeout = maxtime/10 ; /* Average reposting an ACK after 15 seconds */ state->retry_max = (int)timeout/15; } /* But bound the total number */ if(state->retry_max<3) state->retry_max=3; if(state->retry_max>50) state->retry_max=50; /* Compute the re-ACK interval to suit the timeout */ state->retry_time = timeout/state->retry_max; if(state->retry_time<1) state->retry_time=1; infof(state->conn->data, "set timeouts for state %d; Total %d, retry %d maxtry %d\n", state->state, (state->max_time-state->start_time), state->retry_time, state->retry_max); /* init RX time */ time(&state->rx_time); return CURLE_OK; } /********************************************************** * * tftp_set_send_first * * Event handler for the START state * **********************************************************/ static void setpacketevent(tftp_packet_t *packet, unsigned short num) { packet->data[0] = (unsigned char)(num >> 8); packet->data[1] = (unsigned char)(num & 0xff); } static void setpacketblock(tftp_packet_t *packet, unsigned short num) { packet->data[2] = (unsigned char)(num >> 8); packet->data[3] = (unsigned char)(num & 0xff); } static unsigned short getrpacketevent(const tftp_packet_t *packet) { return (unsigned short)((packet->data[0] << 8) | packet->data[1]); } static unsigned short getrpacketblock(const tftp_packet_t *packet) { return (unsigned short)((packet->data[2] << 8) | packet->data[3]); } static size_t Curl_strnlen(const char *string, size_t maxlen) { const char *end = memchr (string, '\0', maxlen); return end ? (size_t) (end - string) : maxlen; } static const char *tftp_option_get(const char *buf, size_t len, const char **option, const char **value) { size_t loc; loc = Curl_strnlen( buf, len ); loc++; /* NULL term */ if (loc >= len) return NULL; *option = buf; loc += Curl_strnlen( buf+loc, len-loc ); loc++; /* NULL term */ if (loc > len) return NULL; *value = &buf[strlen(*option) + 1]; return &buf[loc]; } static CURLcode tftp_parse_option_ack(tftp_state_data_t *state, const char *ptr, int len) { const char *tmp = ptr; struct SessionHandle *data = state->conn->data; /* if OACK doesn't contain blksize option, the default (512) must be used */ state->blksize = TFTP_BLKSIZE_DEFAULT; while (tmp < ptr + len) { const char *option, *value; tmp = tftp_option_get(tmp, ptr + len - tmp, &option, &value); if(tmp == NULL) { failf(data, "Malformed ACK packet, rejecting"); return CURLE_TFTP_ILLEGAL; } infof(data, "got option=(%s) value=(%s)\n", option, value); if(checkprefix(option, TFTP_OPTION_BLKSIZE)) { long blksize; blksize = strtol( value, NULL, 10 ); if(!blksize) { failf(data, "invalid blocksize value in OACK packet"); return CURLE_TFTP_ILLEGAL; } else if(blksize > TFTP_BLKSIZE_MAX) { failf(data, "%s (%d)", "blksize is larger than max supported", TFTP_BLKSIZE_MAX); return CURLE_TFTP_ILLEGAL; } else if(blksize < TFTP_BLKSIZE_MIN) { failf(data, "%s (%d)", "blksize is smaller than min supported", TFTP_BLKSIZE_MIN); return CURLE_TFTP_ILLEGAL; } else if (blksize > state->requested_blksize) { /* could realloc pkt buffers here, but the spec doesn't call out * support for the server requesting a bigger blksize than the client * requests */ failf(data, "%s (%d)", "server requested blksize larger than allocated", blksize); return CURLE_TFTP_ILLEGAL; } state->blksize = (int)blksize; infof(data, "%s (%d) %s (%d)\n", "blksize parsed from OACK", state->blksize, "requested", state->requested_blksize); } else if(checkprefix(option, TFTP_OPTION_TSIZE)) { long tsize = 0; tsize = strtol( value, NULL, 10 ); if(!tsize) { failf(data, "invalid tsize value in OACK packet"); return CURLE_TFTP_ILLEGAL; } Curl_pgrsSetDownloadSize(data, tsize); infof(data, "%s (%d)\n", "tsize parsed from OACK", tsize); } } return CURLE_OK; } static size_t tftp_option_add(tftp_state_data_t *state, size_t csize, char *buf, const char *option) { if( ( strlen(option) + csize + 1 ) > (size_t)state->blksize ) return 0; strcpy(buf, option); return( strlen(option) + 1 ); } static CURLcode tftp_connect_for_tx(tftp_state_data_t *state, tftp_event_t event) { CURLcode res; #ifndef CURL_DISABLE_VERBOSE_STRINGS struct SessionHandle *data = state->conn->data; infof(data, "%s\n", "Connected for transmit"); #endif state->state = TFTP_STATE_TX; res = tftp_set_timeouts(state); if(res != CURLE_OK) return(res); return tftp_tx(state, event); } static CURLcode tftp_connect_for_rx(tftp_state_data_t *state, tftp_event_t event) { CURLcode res; #ifndef CURL_DISABLE_VERBOSE_STRINGS struct SessionHandle *data = state->conn->data; infof(data, "%s\n", "Connected for receive"); #endif state->state = TFTP_STATE_RX; res = tftp_set_timeouts(state); if(res != CURLE_OK) return(res); return tftp_rx(state, event); } static CURLcode tftp_send_first(tftp_state_data_t *state, tftp_event_t event) { size_t sbytes; ssize_t senddata; const char *mode = "octet"; char *filename; char buf[64]; struct SessionHandle *data = state->conn->data; CURLcode res = CURLE_OK; /* Set ascii mode if -B flag was used */ if(data->set.prefer_ascii) mode = "netascii"; switch(event) { case TFTP_EVENT_INIT: /* Send the first packet out */ case TFTP_EVENT_TIMEOUT: /* Resend the first packet out */ /* Increment the retry counter, quit if over the limit */ state->retries++; if(state->retries>state->retry_max) { state->error = TFTP_ERR_NORESPONSE; state->state = TFTP_STATE_FIN; return res; } if(data->set.upload) { /* If we are uploading, send an WRQ */ setpacketevent(&state->spacket, TFTP_EVENT_WRQ); state->conn->data->req.upload_fromhere = (char *)state->spacket.data+4; if(data->set.infilesize != -1) Curl_pgrsSetUploadSize(data, data->set.infilesize); } else { /* If we are downloading, send an RRQ */ setpacketevent(&state->spacket, TFTP_EVENT_RRQ); } /* As RFC3617 describes the separator slash is not actually part of the file name so we skip the always-present first letter of the path string. */ filename = curl_easy_unescape(data, &state->conn->data->state.path[1], 0, NULL); if(!filename) return CURLE_OUT_OF_MEMORY; snprintf((char *)state->spacket.data+2, state->blksize, "%s%c%s%c", filename, '\0', mode, '\0'); sbytes = 4 + strlen(filename) + strlen(mode); /* add tsize option */ if(data->set.upload && (data->set.infilesize != -1)) snprintf( buf, sizeof(buf), "%" FORMAT_OFF_T, data->set.infilesize ); else strcpy(buf, "0"); /* the destination is large enough */ sbytes += tftp_option_add(state, sbytes, (char *)state->spacket.data+sbytes, TFTP_OPTION_TSIZE); sbytes += tftp_option_add(state, sbytes, (char *)state->spacket.data+sbytes, buf); /* add blksize option */ snprintf( buf, sizeof(buf), "%d", state->requested_blksize ); sbytes += tftp_option_add(state, sbytes, (char *)state->spacket.data+sbytes, TFTP_OPTION_BLKSIZE); sbytes += tftp_option_add(state, sbytes, (char *)state->spacket.data+sbytes, buf ); /* add timeout option, this is the max time the session may live */ snprintf( buf, sizeof(buf), "%d", state->retry_time*state->retry_max ); sbytes += tftp_option_add(state, sbytes, (char *)state->spacket.data+sbytes, TFTP_OPTION_INTERVAL); sbytes += tftp_option_add(state, sbytes, (char *)state->spacket.data+sbytes, buf ); senddata = sendto(state->sockfd, (void *)state->spacket.data, sbytes, 0, state->conn->ip_addr->ai_addr, state->conn->ip_addr->ai_addrlen); if(senddata != (ssize_t)sbytes) { failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO)); } Curl_safefree(filename); break; case TFTP_EVENT_OACK: if(data->set.upload) { res = tftp_connect_for_tx(state, event); } else { res = tftp_connect_for_rx(state, event); } break; case TFTP_EVENT_ACK: /* Connected for transmit */ res = tftp_connect_for_tx(state, event); break; case TFTP_EVENT_DATA: /* Connected for receive */ res = tftp_connect_for_rx(state, event); break; case TFTP_EVENT_ERROR: state->state = TFTP_STATE_FIN; break; default: failf(state->conn->data, "tftp_send_first: internal error"); break; } return res; } /********************************************************** * * tftp_rx * * Event handler for the RX state * **********************************************************/ static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event) { ssize_t sbytes; int rblock; struct SessionHandle *data = state->conn->data; switch(event) { case TFTP_EVENT_DATA: /* Is this the block we expect? */ rblock = getrpacketblock(&state->rpacket); if((state->block+1) != rblock) { /* No, log it, up the retry count and fail if over the limit */ infof(data, "Received unexpected DATA packet block %d\n", rblock); state->retries++; if(state->retries>state->retry_max) { failf(data, "tftp_rx: giving up waiting for block %d", state->block+1); return CURLE_TFTP_ILLEGAL; } } /* This is the expected block. Reset counters and ACK it. */ state->block = (unsigned short)rblock; state->retries = 0; setpacketevent(&state->spacket, TFTP_EVENT_ACK); setpacketblock(&state->spacket, state->block); sbytes = sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG, (struct sockaddr *)&state->remote_addr, state->remote_addrlen); if(sbytes < 0) { failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO)); return CURLE_SEND_ERROR; } /* Check if completed (That is, a less than full packet is received) */ if(state->rbytes < (ssize_t)state->blksize+4){ state->state = TFTP_STATE_FIN; } else { state->state = TFTP_STATE_RX; } time(&state->rx_time); break; case TFTP_EVENT_OACK: /* ACK option acknowledgement so we can move on to data */ state->block = 0; state->retries = 0; setpacketevent(&state->spacket, TFTP_EVENT_ACK); setpacketblock(&state->spacket, state->block); sbytes = sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG, (struct sockaddr *)&state->remote_addr, state->remote_addrlen); if(sbytes < 0) { failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO)); return CURLE_SEND_ERROR; } /* we're ready to RX data */ state->state = TFTP_STATE_RX; time(&state->rx_time); break; case TFTP_EVENT_TIMEOUT: /* Increment the retry count and fail if over the limit */ state->retries++; infof(data, "Timeout waiting for block %d ACK. Retries = %d\n", state->retries); if(state->retries > state->retry_max) { state->error = TFTP_ERR_TIMEOUT; state->state = TFTP_STATE_FIN; } else { /* Resend the previous ACK */ sbytes = sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG, (struct sockaddr *)&state->remote_addr, state->remote_addrlen); /* Check all sbytes were sent */ if(sbytes<0) { failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO)); return CURLE_SEND_ERROR; } } break; case TFTP_EVENT_ERROR: setpacketevent(&state->spacket, TFTP_EVENT_ERROR); setpacketblock(&state->spacket, state->block); sbytes = sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG, (struct sockaddr *)&state->remote_addr, state->remote_addrlen); /* don't bother with the return code, but if the socket is still up we * should be a good TFTP client and let the server know we're done */ state->state = TFTP_STATE_FIN; break; default: failf(data, "%s", "tftp_rx: internal error"); return CURLE_TFTP_ILLEGAL; /* not really the perfect return code for this */ } return CURLE_OK; } /********************************************************** * * tftp_tx * * Event handler for the TX state * **********************************************************/ static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event) { struct SessionHandle *data = state->conn->data; ssize_t sbytes; int rblock; CURLcode res = CURLE_OK; struct SingleRequest *k = &data->req; switch(event) { case TFTP_EVENT_ACK: /* Ack the packet */ rblock = getrpacketblock(&state->rpacket); if(rblock != state->block) { /* This isn't the expected block. Log it and up the retry counter */ infof(data, "Received ACK for block %d, expecting %d\n", rblock, state->block); state->retries++; /* Bail out if over the maximum */ if(state->retries>state->retry_max) { failf(data, "tftp_tx: giving up waiting for block %d ack", state->block); res = CURLE_SEND_ERROR; } else { /* Re-send the data packet */ sbytes = sendto(state->sockfd, (void *)&state->spacket, 4+state->sbytes, SEND_4TH_ARG, (struct sockaddr *)&state->remote_addr, state->remote_addrlen); /* Check all sbytes were sent */ if(sbytes<0) { failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO)); res = CURLE_SEND_ERROR; } } return res; } /* This is the expected packet. Reset the counters and send the next block */ time(&state->rx_time); state->block++; state->retries = 0; setpacketevent(&state->spacket, TFTP_EVENT_DATA); setpacketblock(&state->spacket, state->block); if(state->block > 1 && state->sbytes < (int)state->blksize) { state->state = TFTP_STATE_FIN; return CURLE_OK; } res = Curl_fillreadbuffer(state->conn, (size_t)state->blksize, &state->sbytes); if(res) return res; sbytes = sendto(state->sockfd, (void *)state->spacket.data, 4+state->sbytes, SEND_4TH_ARG, (struct sockaddr *)&state->remote_addr, state->remote_addrlen); /* Check all sbytes were sent */ if(sbytes<0) { failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO)); return CURLE_SEND_ERROR; } /* Update the progress meter */ k->writebytecount += state->sbytes; Curl_pgrsSetUploadCounter(data, k->writebytecount); break; case TFTP_EVENT_TIMEOUT: /* Increment the retry counter and log the timeout */ state->retries++; infof(data, "Timeout waiting for block %d ACK. " " Retries = %d\n", state->retries); /* Decide if we've had enough */ if(state->retries > state->retry_max) { state->error = TFTP_ERR_TIMEOUT; state->state = TFTP_STATE_FIN; } else { /* Re-send the data packet */ sbytes = sendto(state->sockfd, (void *)state->spacket.data, 4+state->sbytes, SEND_4TH_ARG, (struct sockaddr *)&state->remote_addr, state->remote_addrlen); /* Check all sbytes were sent */ if(sbytes<0) { failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO)); return CURLE_SEND_ERROR; } /* since this was a re-send, we remain at the still byte position */ Curl_pgrsSetUploadCounter(data, k->writebytecount); } break; case TFTP_EVENT_ERROR: state->state = TFTP_STATE_FIN; setpacketevent(&state->spacket, TFTP_EVENT_ERROR); setpacketblock(&state->spacket, state->block); sbytes = sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG, (struct sockaddr *)&state->remote_addr, state->remote_addrlen); /* don't bother with the return code, but if the socket is still up we * should be a good TFTP client and let the server know we're done */ state->state = TFTP_STATE_FIN; break; default: failf(data, "%s", "tftp_tx: internal error"); break; } return res; } /********************************************************** * * tftp_translate_code * * Translate internal error codes to CURL error codes * **********************************************************/ CURLcode tftp_translate_code(tftp_error_t error) { CURLcode code = CURLE_OK; if(error != TFTP_ERR_NONE) { switch(error) { case TFTP_ERR_NOTFOUND: code = CURLE_TFTP_NOTFOUND; break; case TFTP_ERR_PERM: code = CURLE_TFTP_PERM; break; case TFTP_ERR_DISKFULL: code = CURLE_REMOTE_DISK_FULL; break; case TFTP_ERR_UNDEF: case TFTP_ERR_ILLEGAL: code = CURLE_TFTP_ILLEGAL; break; case TFTP_ERR_UNKNOWNID: code = CURLE_TFTP_UNKNOWNID; break; case TFTP_ERR_EXISTS: code = CURLE_REMOTE_FILE_EXISTS; break; case TFTP_ERR_NOSUCHUSER: code = CURLE_TFTP_NOSUCHUSER; break; case TFTP_ERR_TIMEOUT: code = CURLE_OPERATION_TIMEDOUT; break; case TFTP_ERR_NORESPONSE: code = CURLE_COULDNT_CONNECT; break; default: code= CURLE_ABORTED_BY_CALLBACK; break; } } else { code = CURLE_OK; } return(code); } /********************************************************** * * tftp_state_machine * * The tftp state machine event dispatcher * **********************************************************/ static CURLcode tftp_state_machine(tftp_state_data_t *state, tftp_event_t event) { CURLcode res = CURLE_OK; struct SessionHandle *data = state->conn->data; switch(state->state) { case TFTP_STATE_START: DEBUGF(infof(data, "TFTP_STATE_START\n")); res = tftp_send_first(state, event); break; case TFTP_STATE_RX: DEBUGF(infof(data, "TFTP_STATE_RX\n")); res = tftp_rx(state, event); break; case TFTP_STATE_TX: DEBUGF(infof(data, "TFTP_STATE_TX\n")); res = tftp_tx(state, event); break; case TFTP_STATE_FIN: infof(data, "%s\n", "TFTP finished"); break; default: DEBUGF(infof(data, "STATE: %d\n", state->state)); failf(data, "%s", "Internal state machine error"); res = CURLE_TFTP_ILLEGAL; break; } return res; } /********************************************************** * * tftp_disconnect * * The disconnect callback * **********************************************************/ static CURLcode tftp_disconnect(struct connectdata *conn) { tftp_state_data_t *state = conn->proto.tftpc; /* done, free dynamically allocated pkt buffers */ if(state) { Curl_safefree(state->rpacket.data); Curl_safefree(state->spacket.data); free(state); } return CURLE_OK; } /********************************************************** * * tftp_connect * * The connect callback * **********************************************************/ static CURLcode tftp_connect(struct connectdata *conn, bool *done) { CURLcode code; tftp_state_data_t *state; int blksize, rc; blksize = TFTP_BLKSIZE_DEFAULT; /* If there already is a protocol-specific struct allocated for this sessionhandle, deal with it */ Curl_reset_reqproto(conn); state = conn->proto.tftpc = calloc(1, sizeof(tftp_state_data_t)); if(!state) return CURLE_OUT_OF_MEMORY; /* alloc pkt buffers based on specified blksize */ if(conn->data->set.tftp_blksize) { blksize = (int)conn->data->set.tftp_blksize; if(blksize > TFTP_BLKSIZE_MAX || blksize < TFTP_BLKSIZE_MIN ) return CURLE_TFTP_ILLEGAL; } if(!state->rpacket.data) { state->rpacket.data = calloc(1, blksize + 2 + 2); if(!state->rpacket.data) return CURLE_OUT_OF_MEMORY; } if(!state->spacket.data) { state->spacket.data = calloc(1, blksize + 2 + 2); if(!state->spacket.data) return CURLE_OUT_OF_MEMORY; } conn->bits.close = TRUE; /* we don't keep TFTP connections up bascially because there's none or very little gain for UDP */ state->conn = conn; state->sockfd = state->conn->sock[FIRSTSOCKET]; state->state = TFTP_STATE_START; state->error = TFTP_ERR_NONE; state->blksize = TFTP_BLKSIZE_DEFAULT; state->requested_blksize = blksize; ((struct sockaddr *)&state->local_addr)->sa_family = (unsigned short)(conn->ip_addr->ai_family); tftp_set_timeouts(state); if(!conn->bits.bound) { /* If not already bound, bind to any interface, random UDP port. If it is * reused or a custom local port was desired, this has already been done! * * We once used the size of the local_addr struct as the third argument * for bind() to better work with IPv6 or whatever size the struct could * have, but we learned that at least Tru64, AIX and IRIX *requires* the * size of that argument to match the exact size of a 'sockaddr_in' struct * when running IPv4-only. * * Therefore we use the size from the address we connected to, which we * assume uses the same IP version and thus hopefully this works for both * IPv4 and IPv6... */ rc = bind(state->sockfd, (struct sockaddr *)&state->local_addr, conn->ip_addr->ai_addrlen); if(rc) { failf(conn->data, "bind() failed; %s", Curl_strerror(conn, SOCKERRNO)); return CURLE_COULDNT_CONNECT; } conn->bits.bound = TRUE; } Curl_pgrsStartNow(conn->data); *done = TRUE; code = CURLE_OK; return(code); } /********************************************************** * * tftp_done * * The done callback * **********************************************************/ static CURLcode tftp_done(struct connectdata *conn, CURLcode status, bool premature) { CURLcode code = CURLE_OK; tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc; (void)status; /* unused */ (void)premature; /* not used */ Curl_pgrsDone(conn); /* If we have encountered an error */ code = tftp_translate_code(state->error); return code; } /********************************************************** * * tftp_getsock * * The getsock callback * **********************************************************/ static int tftp_getsock(struct connectdata *conn, curl_socket_t *socks, int numsocks) { if(!numsocks) return GETSOCK_BLANK; socks[0] = conn->sock[FIRSTSOCKET]; return GETSOCK_READSOCK(0); } /********************************************************** * * tftp_receive_packet * * Called once select fires and data is ready on the socket * **********************************************************/ static CURLcode tftp_receive_packet(struct connectdata *conn) { struct Curl_sockaddr_storage fromaddr; curl_socklen_t fromlen; CURLcode result = CURLE_OK; struct SessionHandle *data = conn->data; tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc; struct SingleRequest *k = &data->req; /* Receive the packet */ fromlen = sizeof(fromaddr); state->rbytes = (int)recvfrom(state->sockfd, (void *)state->rpacket.data, state->blksize+4, 0, (struct sockaddr *)&fromaddr, &fromlen); if(state->remote_addrlen==0) { memcpy(&state->remote_addr, &fromaddr, fromlen); state->remote_addrlen = fromlen; } /* Sanity check packet length */ if(state->rbytes < 4) { failf(data, "Received too short packet"); /* Not a timeout, but how best to handle it? */ state->event = TFTP_EVENT_TIMEOUT; } else { /* The event is given by the TFTP packet time */ state->event = (tftp_event_t)getrpacketevent(&state->rpacket); switch(state->event) { case TFTP_EVENT_DATA: /* Don't pass to the client empty or retransmitted packets */ if(state->rbytes > 4 && ((state->block+1) == getrpacketblock(&state->rpacket))) { result = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)state->rpacket.data+4, state->rbytes-4); if(result) { tftp_state_machine(state, TFTP_EVENT_ERROR); return result; } k->bytecount += state->rbytes-4; Curl_pgrsSetDownloadCounter(data, (curl_off_t) k->bytecount); } break; case TFTP_EVENT_ERROR: state->error = (tftp_error_t)getrpacketblock(&state->rpacket); infof(data, "%s\n", (const char *)state->rpacket.data+4); break; case TFTP_EVENT_ACK: break; case TFTP_EVENT_OACK: result = tftp_parse_option_ack(state, (const char *)state->rpacket.data+2, state->rbytes-2); if(result) return result; break; case TFTP_EVENT_RRQ: case TFTP_EVENT_WRQ: default: failf(data, "%s", "Internal error: Unexpected packet"); break; } /* Update the progress meter */ if(Curl_pgrsUpdate(conn)) { tftp_state_machine(state, TFTP_EVENT_ERROR); return CURLE_ABORTED_BY_CALLBACK; } } return result; } /********************************************************** * * tftp_state_timeout * * Check if timeouts have been reached * **********************************************************/ static long tftp_state_timeout(struct connectdata *conn, tftp_event_t *event) { time_t current; tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc; if (event) *event = TFTP_EVENT_NONE; time(¤t); if(current > state->max_time) { DEBUGF(infof(conn->data, "timeout: %d > %d\n", current, state->max_time)); state->error = TFTP_ERR_TIMEOUT; state->state = TFTP_STATE_FIN; return(0); } else if (current > state->rx_time+state->retry_time) { if (event) *event = TFTP_EVENT_TIMEOUT; time(&state->rx_time); /* update even though we received nothing */ return(state->max_time-current); } else { return(state->max_time-current); } } /********************************************************** * * tftp_easy_statemach * * Handle easy request until completion * **********************************************************/ static CURLcode tftp_easy_statemach(struct connectdata *conn) { int rc; int check_time = 0; CURLcode result = CURLE_OK; struct SessionHandle *data = conn->data; tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc; /* Run the TFTP State Machine */ for(; (state->state != TFTP_STATE_FIN) && (result == CURLE_OK); result=tftp_state_machine(state, state->event) ) { /* Wait until ready to read or timeout occurs */ rc=Curl_socket_ready(state->sockfd, CURL_SOCKET_BAD, state->retry_time * 1000); if(rc == -1) { /* bail out */ int error = SOCKERRNO; failf(data, "%s", Curl_strerror(conn, error)); state->event = TFTP_EVENT_ERROR; } else if(rc==0) { /* A timeout occured */ state->event = TFTP_EVENT_TIMEOUT; /* Force a look at transfer timeouts */ check_time = 0; } else { result = tftp_receive_packet(conn); } /* Check for transfer timeout every 10 blocks, or after timeout */ if(check_time%10==0) { /* ignore the event here as Curl_socket_ready() handles * retransmission timeouts inside the easy state mach */ tftp_state_timeout(conn, NULL); } if(result) return(result); } /* Tell curl we're done */ result = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL); return(result); } /********************************************************** * * tftp_multi_statemach * * Handle single RX socket event and return * **********************************************************/ static CURLcode tftp_multi_statemach(struct connectdata *conn, bool *done) { int rc; tftp_event_t event; CURLcode result = CURLE_OK; struct SessionHandle *data = conn->data; tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc; long timeout_ms = tftp_state_timeout(conn, &event); *done = FALSE; if(timeout_ms <= 0) { failf(data, "TFTP response timeout"); return CURLE_OPERATION_TIMEDOUT; } else if (event != TFTP_EVENT_NONE) { result = tftp_state_machine(state, event); if(result != CURLE_OK) return(result); *done = (bool)(state->state == TFTP_STATE_FIN); if(*done) /* Tell curl we're done */ result = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL); } else { /* no timeouts to handle, check our socket */ rc = Curl_socket_ready(state->sockfd, CURL_SOCKET_BAD, 0); if(rc == -1) { /* bail out */ int error = SOCKERRNO; failf(data, "%s", Curl_strerror(conn, error)); state->event = TFTP_EVENT_ERROR; } else if(rc != 0) { result = tftp_receive_packet(conn); if(result != CURLE_OK) return(result); result = tftp_state_machine(state, state->event); if(result != CURLE_OK) return(result); *done = (bool)(state->state == TFTP_STATE_FIN); if(*done) /* Tell curl we're done */ result = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL); } /* if rc == 0, then select() timed out */ } return result; } /********************************************************** * * tftp_doing * * Called from multi.c while DOing * **********************************************************/ static CURLcode tftp_doing(struct connectdata *conn, bool *dophase_done) { CURLcode result; result = tftp_multi_statemach(conn, dophase_done); if(*dophase_done) { DEBUGF(infof(conn->data, "DO phase is complete\n")); } return result; } /********************************************************** * * tftp_peform * * Entry point for transfer from tftp_do, sarts state mach * **********************************************************/ static CURLcode tftp_perform(struct connectdata *conn, bool *dophase_done) { CURLcode result = CURLE_OK; tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc; *dophase_done = FALSE; result = tftp_state_machine(state, TFTP_EVENT_INIT); if(state->state == TFTP_STATE_FIN || result != CURLE_OK) return(result); if(conn->data->state.used_interface == Curl_if_multi) tftp_multi_statemach(conn, dophase_done); else { result = tftp_easy_statemach(conn); *dophase_done = TRUE; /* with the easy interface we are done here */ } if(*dophase_done) DEBUGF(infof(conn->data, "DO phase is complete\n")); return result; } /********************************************************** * * tftp_do * * The do callback * * This callback initiates the TFTP transfer * **********************************************************/ static CURLcode tftp_do(struct connectdata *conn, bool *done) { tftp_state_data_t *state; CURLcode code; *done = FALSE; /* Since connections can be re-used between SessionHandles, this might be a connection already existing but on a fresh SessionHandle struct so we must make sure we have a good 'struct TFTP' to play with. For new connections, the struct TFTP is allocated and setup in the tftp_connect() function. */ Curl_reset_reqproto(conn); if(!conn->proto.tftpc) { code = tftp_connect(conn, done); if(code) return code; } state = (tftp_state_data_t *)conn->proto.tftpc; code = tftp_perform(conn, done); /* If we have encountered an error */ code = tftp_translate_code(state->error); return code; } static CURLcode tftp_setup_connection(struct connectdata * conn) { struct SessionHandle *data = conn->data; char * type; char command; conn->socktype = SOCK_DGRAM; /* UDP datagram based */ /* TFTP URLs support an extension like ";mode=<typecode>" that * we'll try to get now! */ type = strstr(data->state.path, ";mode="); if(!type) type = strstr(conn->host.rawalloc, ";mode="); if(type) { *type = 0; /* it was in the middle of the hostname */ command = Curl_raw_toupper(type[6]); switch (command) { case 'A': /* ASCII mode */ case 'N': /* NETASCII mode */ data->set.prefer_ascii = TRUE; break; case 'O': /* octet mode */ case 'I': /* binary mode */ default: /* switch off ASCII */ data->set.prefer_ascii = FALSE; break; } } return CURLE_OK; } #endif