| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2013, 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. |
| * |
| * RFC1870 SMTP Service Extension for Message Size |
| * RFC2195 CRAM-MD5 authentication |
| * RFC2831 DIGEST-MD5 authentication |
| * RFC3207 SMTP over TLS |
| * RFC4422 Simple Authentication and Security Layer (SASL) |
| * RFC4616 PLAIN authentication |
| * RFC4954 SMTP Authentication |
| * RFC5321 SMTP protocol |
| * Draft SMTP URL Interface |
| * |
| ***************************************************************************/ |
| |
| #include "curl_setup.h" |
| |
| #ifndef CURL_DISABLE_SMTP |
| |
| #ifdef HAVE_NETINET_IN_H |
| #include <netinet/in.h> |
| #endif |
| #ifdef HAVE_ARPA_INET_H |
| #include <arpa/inet.h> |
| #endif |
| #ifdef HAVE_UTSNAME_H |
| #include <sys/utsname.h> |
| #endif |
| #ifdef HAVE_NETDB_H |
| #include <netdb.h> |
| #endif |
| #ifdef __VMS |
| #include <in.h> |
| #include <inet.h> |
| #endif |
| |
| #if (defined(NETWARE) && defined(__NOVELL_LIBC__)) |
| #undef in_addr_t |
| #define in_addr_t unsigned long |
| #endif |
| |
| #include <curl/curl.h> |
| #include "urldata.h" |
| #include "sendf.h" |
| #include "if2ip.h" |
| #include "hostip.h" |
| #include "progress.h" |
| #include "transfer.h" |
| #include "escape.h" |
| #include "http.h" /* for HTTP proxy tunnel stuff */ |
| #include "socks.h" |
| #include "smtp.h" |
| |
| #include "strtoofft.h" |
| #include "strequal.h" |
| #include "sslgen.h" |
| #include "connect.h" |
| #include "strerror.h" |
| #include "select.h" |
| #include "multiif.h" |
| #include "url.h" |
| #include "rawstr.h" |
| #include "curl_gethostname.h" |
| #include "curl_sasl.h" |
| #include "warnless.h" |
| |
| #define _MPRINTF_REPLACE /* use our functions only */ |
| #include <curl/mprintf.h> |
| |
| #include "curl_memory.h" |
| /* The last #include file should be: */ |
| #include "memdebug.h" |
| |
| /* Local API functions */ |
| static CURLcode smtp_regular_transfer(struct connectdata *conn, bool *done); |
| static CURLcode smtp_do(struct connectdata *conn, bool *done); |
| static CURLcode smtp_done(struct connectdata *conn, CURLcode status, |
| bool premature); |
| static CURLcode smtp_connect(struct connectdata *conn, bool *done); |
| static CURLcode smtp_disconnect(struct connectdata *conn, bool dead); |
| static CURLcode smtp_multi_statemach(struct connectdata *conn, bool *done); |
| static int smtp_getsock(struct connectdata *conn, curl_socket_t *socks, |
| int numsocks); |
| static CURLcode smtp_doing(struct connectdata *conn, bool *dophase_done); |
| static CURLcode smtp_setup_connection(struct connectdata *conn); |
| static CURLcode smtp_parse_url_options(struct connectdata *conn); |
| static CURLcode smtp_parse_url_path(struct connectdata *conn); |
| |
| /* |
| * SMTP protocol handler. |
| */ |
| |
| const struct Curl_handler Curl_handler_smtp = { |
| "SMTP", /* scheme */ |
| smtp_setup_connection, /* setup_connection */ |
| smtp_do, /* do_it */ |
| smtp_done, /* done */ |
| ZERO_NULL, /* do_more */ |
| smtp_connect, /* connect_it */ |
| smtp_multi_statemach, /* connecting */ |
| smtp_doing, /* doing */ |
| smtp_getsock, /* proto_getsock */ |
| smtp_getsock, /* doing_getsock */ |
| ZERO_NULL, /* domore_getsock */ |
| ZERO_NULL, /* perform_getsock */ |
| smtp_disconnect, /* disconnect */ |
| ZERO_NULL, /* readwrite */ |
| PORT_SMTP, /* defport */ |
| CURLPROTO_SMTP, /* protocol */ |
| PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY /* flags */ |
| }; |
| |
| #ifdef USE_SSL |
| /* |
| * SMTPS protocol handler. |
| */ |
| |
| const struct Curl_handler Curl_handler_smtps = { |
| "SMTPS", /* scheme */ |
| smtp_setup_connection, /* setup_connection */ |
| smtp_do, /* do_it */ |
| smtp_done, /* done */ |
| ZERO_NULL, /* do_more */ |
| smtp_connect, /* connect_it */ |
| smtp_multi_statemach, /* connecting */ |
| smtp_doing, /* doing */ |
| smtp_getsock, /* proto_getsock */ |
| smtp_getsock, /* doing_getsock */ |
| ZERO_NULL, /* domore_getsock */ |
| ZERO_NULL, /* perform_getsock */ |
| smtp_disconnect, /* disconnect */ |
| ZERO_NULL, /* readwrite */ |
| PORT_SMTPS, /* defport */ |
| CURLPROTO_SMTP | CURLPROTO_SMTPS, /* protocol */ |
| PROTOPT_CLOSEACTION | PROTOPT_SSL |
| | PROTOPT_NOURLQUERY /* flags */ |
| }; |
| #endif |
| |
| #ifndef CURL_DISABLE_HTTP |
| /* |
| * HTTP-proxyed SMTP protocol handler. |
| */ |
| |
| static const struct Curl_handler Curl_handler_smtp_proxy = { |
| "SMTP", /* scheme */ |
| ZERO_NULL, /* setup_connection */ |
| Curl_http, /* do_it */ |
| Curl_http_done, /* done */ |
| ZERO_NULL, /* do_more */ |
| ZERO_NULL, /* connect_it */ |
| ZERO_NULL, /* connecting */ |
| ZERO_NULL, /* doing */ |
| ZERO_NULL, /* proto_getsock */ |
| ZERO_NULL, /* doing_getsock */ |
| ZERO_NULL, /* domore_getsock */ |
| ZERO_NULL, /* perform_getsock */ |
| ZERO_NULL, /* disconnect */ |
| ZERO_NULL, /* readwrite */ |
| PORT_SMTP, /* defport */ |
| CURLPROTO_HTTP, /* protocol */ |
| PROTOPT_NONE /* flags */ |
| }; |
| |
| #ifdef USE_SSL |
| /* |
| * HTTP-proxyed SMTPS protocol handler. |
| */ |
| |
| static const struct Curl_handler Curl_handler_smtps_proxy = { |
| "SMTPS", /* scheme */ |
| ZERO_NULL, /* setup_connection */ |
| Curl_http, /* do_it */ |
| Curl_http_done, /* done */ |
| ZERO_NULL, /* do_more */ |
| ZERO_NULL, /* connect_it */ |
| ZERO_NULL, /* connecting */ |
| ZERO_NULL, /* doing */ |
| ZERO_NULL, /* proto_getsock */ |
| ZERO_NULL, /* doing_getsock */ |
| ZERO_NULL, /* domore_getsock */ |
| ZERO_NULL, /* perform_getsock */ |
| ZERO_NULL, /* disconnect */ |
| ZERO_NULL, /* readwrite */ |
| PORT_SMTPS, /* defport */ |
| CURLPROTO_HTTP, /* protocol */ |
| PROTOPT_NONE /* flags */ |
| }; |
| #endif |
| #endif |
| |
| #ifdef USE_SSL |
| static void smtp_to_smtps(struct connectdata *conn) |
| { |
| conn->handler = &Curl_handler_smtps; |
| } |
| #else |
| #define smtp_to_smtps(x) Curl_nop_stmt |
| #endif |
| |
| /*********************************************************************** |
| * |
| * pop3_endofresp() |
| * |
| * Checks for an ending SMTP status code at the start of the given string, but |
| * also detects various capabilities from the EHLO response including the |
| * supported authentication mechanisms. |
| */ |
| static bool smtp_endofresp(struct connectdata *conn, char *line, size_t len, |
| int *resp) |
| { |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| bool result = FALSE; |
| size_t wordlen; |
| |
| if(len < 4 || !ISDIGIT(line[0]) || !ISDIGIT(line[1]) || !ISDIGIT(line[2])) |
| return FALSE; /* Nothing for us */ |
| |
| /* Do we have a command response? */ |
| result = (line[3] == ' ') ? TRUE : FALSE; |
| if(result) |
| *resp = curlx_sltosi(strtol(line, NULL, 10)); |
| |
| /* Are we processing EHLO command data? */ |
| if(smtpc->state == SMTP_EHLO && (!result || (result && *resp/100 == 2))) { |
| line += 4; |
| len -= 4; |
| |
| /* Does the server support the STARTTLS capability? */ |
| if(len >= 8 && !memcmp(line, "STARTTLS", 8)) |
| smtpc->tls_supported = TRUE; |
| |
| /* Does the server support the SIZE capability? */ |
| else if(len >= 4 && !memcmp(line, "SIZE", 4)) |
| smtpc->size_supported = TRUE; |
| |
| /* Do we have the authentication mechanism list? */ |
| else if(len >= 5 && !memcmp(line, "AUTH ", 5)) { |
| line += 5; |
| len -= 5; |
| |
| /* Loop through the data line */ |
| for(;;) { |
| while(len && |
| (*line == ' ' || *line == '\t' || |
| *line == '\r' || *line == '\n')) { |
| |
| line++; |
| len--; |
| } |
| |
| if(!len) |
| break; |
| |
| /* Extract the word */ |
| for(wordlen = 0; wordlen < len && line[wordlen] != ' ' && |
| line[wordlen] != '\t' && line[wordlen] != '\r' && |
| line[wordlen] != '\n';) |
| wordlen++; |
| |
| /* Test the word for a matching authentication mechanism */ |
| if(wordlen == 5 && !memcmp(line, "LOGIN", 5)) |
| smtpc->authmechs |= SASL_MECH_LOGIN; |
| else if(wordlen == 5 && !memcmp(line, "PLAIN", 5)) |
| smtpc->authmechs |= SASL_MECH_PLAIN; |
| else if(wordlen == 8 && !memcmp(line, "CRAM-MD5", 8)) |
| smtpc->authmechs |= SASL_MECH_CRAM_MD5; |
| else if(wordlen == 10 && !memcmp(line, "DIGEST-MD5", 10)) |
| smtpc->authmechs |= SASL_MECH_DIGEST_MD5; |
| else if(wordlen == 6 && !memcmp(line, "GSSAPI", 6)) |
| smtpc->authmechs |= SASL_MECH_GSSAPI; |
| else if(wordlen == 8 && !memcmp(line, "EXTERNAL", 8)) |
| smtpc->authmechs |= SASL_MECH_EXTERNAL; |
| else if(wordlen == 4 && !memcmp(line, "NTLM", 4)) |
| smtpc->authmechs |= SASL_MECH_NTLM; |
| |
| line += wordlen; |
| len -= wordlen; |
| } |
| } |
| } |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * state() |
| * |
| * This is the ONLY way to change SMTP state! |
| */ |
| static void state(struct connectdata *conn, smtpstate newstate) |
| { |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| #if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS) |
| /* for debug purposes */ |
| static const char * const names[] = { |
| "STOP", |
| "SERVERGREET", |
| "EHLO", |
| "HELO", |
| "STARTTLS", |
| "UPGRADETLS", |
| "AUTH_PLAIN", |
| "AUTH_LOGIN", |
| "AUTH_LOGIN_PASSWD", |
| "AUTH_CRAMMD5", |
| "AUTH_DIGESTMD5", |
| "AUTH_DIGESTMD5_RESP", |
| "AUTH_NTLM", |
| "AUTH_NTLM_TYPE2MSG", |
| "AUTH_FINAL", |
| "MAIL", |
| "RCPT", |
| "DATA", |
| "POSTDATA", |
| "QUIT", |
| /* LAST */ |
| }; |
| |
| if(smtpc->state != newstate) |
| infof(conn->data, "SMTP %p state change from %s to %s\n", |
| (void *)smtpc, names[smtpc->state], names[newstate]); |
| #endif |
| |
| smtpc->state = newstate; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform_ehlo() |
| * |
| * Sends the EHLO command to not only initialise communication with the ESMTP |
| * server but to also obtain a list of server side supported capabilities. |
| */ |
| static CURLcode smtp_perform_ehlo(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| |
| smtpc->authmechs = 0; /* No known authentication mechanisms yet */ |
| smtpc->authused = 0; /* Clear the authentication mechanism used |
| for esmtp connections */ |
| smtpc->tls_supported = FALSE; /* Clear the TLS capability */ |
| |
| /* Send the EHLO command */ |
| result = Curl_pp_sendf(&smtpc->pp, "EHLO %s", smtpc->domain); |
| |
| if(!result) |
| state(conn, SMTP_EHLO); |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform_helo() |
| * |
| * Sends the HELO command to initialise communication with the SMTP server. |
| */ |
| static CURLcode smtp_perform_helo(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| |
| smtpc->authused = 0; /* No authentication mechanism used in smtp |
| connections */ |
| |
| /* Send the HELO command */ |
| result = Curl_pp_sendf(&smtpc->pp, "HELO %s", smtpc->domain); |
| |
| if(!result) |
| state(conn, SMTP_HELO); |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform_starttls() |
| * |
| * Sends the STLS command to start the upgrade to TLS. |
| */ |
| static CURLcode smtp_perform_starttls(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| |
| /* Send the STARTTLS command */ |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "STARTTLS"); |
| |
| if(!result) |
| state(conn, SMTP_STARTTLS); |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform_upgrade_tls() |
| * |
| * Performs the upgrade to TLS. |
| */ |
| static CURLcode smtp_perform_upgrade_tls(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| |
| /* Start the SSL connection */ |
| result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &smtpc->ssldone); |
| |
| if(!result) { |
| if(smtpc->state != SMTP_UPGRADETLS) |
| state(conn, SMTP_UPGRADETLS); |
| |
| if(smtpc->ssldone) { |
| smtp_to_smtps(conn); |
| result = smtp_perform_ehlo(conn); |
| } |
| } |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform_authenticate() |
| * |
| * Sends an AUTH command allowing the client to login with the appropriate |
| * SASL authentication mechanism. |
| */ |
| static CURLcode smtp_perform_authenticate(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| const char *mech = NULL; |
| char *initresp = NULL; |
| size_t len = 0; |
| smtpstate state1 = SMTP_STOP; |
| smtpstate state2 = SMTP_STOP; |
| |
| /* Check we have a username and password to authenticate with and end the |
| connect phase if we don't */ |
| if(!conn->bits.user_passwd) { |
| state(conn, SMTP_STOP); |
| |
| return result; |
| } |
| |
| /* Calculate the supported authentication mechanism, by decreasing order of |
| security, as well as the initial response where appropriate */ |
| #ifndef CURL_DISABLE_CRYPTO_AUTH |
| if((smtpc->authmechs & SASL_MECH_DIGEST_MD5) && |
| (smtpc->prefmech & SASL_MECH_DIGEST_MD5)) { |
| mech = "DIGEST-MD5"; |
| state1 = SMTP_AUTH_DIGESTMD5; |
| smtpc->authused = SASL_MECH_DIGEST_MD5; |
| } |
| else if((smtpc->authmechs & SASL_MECH_CRAM_MD5) && |
| (smtpc->prefmech & SASL_MECH_CRAM_MD5)) { |
| mech = "CRAM-MD5"; |
| state1 = SMTP_AUTH_CRAMMD5; |
| smtpc->authused = SASL_MECH_CRAM_MD5; |
| } |
| else |
| #endif |
| #ifdef USE_NTLM |
| if((smtpc->authmechs & SASL_MECH_NTLM) && |
| (smtpc->prefmech & SASL_MECH_NTLM)) { |
| mech = "NTLM"; |
| state1 = SMTP_AUTH_NTLM; |
| state2 = SMTP_AUTH_NTLM_TYPE2MSG; |
| smtpc->authused = SASL_MECH_NTLM; |
| |
| if(data->set.sasl_ir) |
| result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd, |
| &conn->ntlm, |
| &initresp, &len); |
| } |
| else |
| #endif |
| if((smtpc->authmechs & SASL_MECH_LOGIN) && |
| (smtpc->prefmech & SASL_MECH_LOGIN)) { |
| mech = "LOGIN"; |
| state1 = SMTP_AUTH_LOGIN; |
| state2 = SMTP_AUTH_LOGIN_PASSWD; |
| smtpc->authused = SASL_MECH_LOGIN; |
| |
| if(data->set.sasl_ir) |
| result = Curl_sasl_create_login_message(conn->data, conn->user, |
| &initresp, &len); |
| } |
| else if((smtpc->authmechs & SASL_MECH_PLAIN) && |
| (smtpc->prefmech & SASL_MECH_PLAIN)) { |
| mech = "PLAIN"; |
| state1 = SMTP_AUTH_PLAIN; |
| state2 = SMTP_AUTH_FINAL; |
| smtpc->authused = SASL_MECH_PLAIN; |
| |
| if(data->set.sasl_ir) |
| result = Curl_sasl_create_plain_message(conn->data, conn->user, |
| conn->passwd, &initresp, &len); |
| } |
| |
| if(!result) { |
| if(mech) { |
| /* Perform SASL based authentication */ |
| if(initresp && |
| 8 + strlen(mech) + len <= 512) { /* AUTH <mech> ...<crlf> */ |
| result = Curl_pp_sendf(&smtpc->pp, "AUTH %s %s", mech, initresp); |
| |
| if(!result) |
| state(conn, state2); |
| } |
| else { |
| result = Curl_pp_sendf(&smtpc->pp, "AUTH %s", mech); |
| |
| if(!result) |
| state(conn, state1); |
| } |
| |
| Curl_safefree(initresp); |
| } |
| else { |
| /* Other mechanisms not supported */ |
| infof(conn->data, "No known authentication mechanisms supported!\n"); |
| result = CURLE_LOGIN_DENIED; |
| } |
| } |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform_mail() |
| * |
| * Sends an MAIL command to initiate the upload of a message. |
| */ |
| static CURLcode smtp_perform_mail(struct connectdata *conn) |
| { |
| char *from = NULL; |
| char *auth = NULL; |
| char *size = NULL; |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| |
| /* Calculate the FROM parameter */ |
| if(!data->set.str[STRING_MAIL_FROM]) |
| /* Null reverse-path, RFC-5321, sect. 3.6.3 */ |
| from = strdup("<>"); |
| else if(data->set.str[STRING_MAIL_FROM][0] == '<') |
| from = aprintf("%s", data->set.str[STRING_MAIL_FROM]); |
| else |
| from = aprintf("<%s>", data->set.str[STRING_MAIL_FROM]); |
| |
| if(!from) |
| return CURLE_OUT_OF_MEMORY; |
| |
| /* Calculate the optional AUTH parameter */ |
| if(data->set.str[STRING_MAIL_AUTH] && conn->proto.smtpc.authused) { |
| if(data->set.str[STRING_MAIL_AUTH][0] != '\0') |
| auth = aprintf("%s", data->set.str[STRING_MAIL_AUTH]); |
| else |
| /* Empty AUTH, RFC-2554, sect. 5 */ |
| auth = strdup("<>"); |
| |
| if(!auth) { |
| Curl_safefree(from); |
| |
| return CURLE_OUT_OF_MEMORY; |
| } |
| } |
| |
| /* Calculate the optional SIZE parameter */ |
| if(conn->proto.smtpc.size_supported && conn->data->set.infilesize > 0) { |
| size = aprintf("%" FORMAT_OFF_T, data->set.infilesize); |
| |
| if(!size) { |
| Curl_safefree(from); |
| Curl_safefree(auth); |
| |
| return CURLE_OUT_OF_MEMORY; |
| } |
| } |
| |
| /* Send the MAIL command */ |
| if(!auth && !size) |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, |
| "MAIL FROM:%s", from); |
| else if(auth && !size) |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, |
| "MAIL FROM:%s AUTH=%s", from, auth); |
| else if(auth && size) |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, |
| "MAIL FROM:%s AUTH=%s SIZE=%s", from, auth, size); |
| else |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, |
| "MAIL FROM:%s SIZE=%s", from, size); |
| |
| Curl_safefree(from); |
| Curl_safefree(auth); |
| Curl_safefree(size); |
| |
| if(!result) |
| state(conn, SMTP_MAIL); |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform_rcpt_to() |
| * |
| * Sends a RCPT TO command for a given recipient as part of the message upload |
| * process. |
| */ |
| static CURLcode smtp_perform_rcpt_to(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| struct SMTP *smtp = data->state.proto.smtp; |
| |
| /* Send the RCPT TO command */ |
| if(smtp->rcpt) { |
| if(smtp->rcpt->data[0] == '<') |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "RCPT TO:%s", |
| smtp->rcpt->data); |
| else |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "RCPT TO:<%s>", |
| smtp->rcpt->data); |
| if(!result) |
| state(conn, SMTP_RCPT); |
| } |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform_quit() |
| * |
| * Performs the quit action prior to sclose() being called. |
| */ |
| static CURLcode smtp_perform_quit(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| |
| /* Send the QUIT command */ |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "QUIT"); |
| |
| if(!result) |
| state(conn, SMTP_QUIT); |
| |
| return result; |
| } |
| |
| /* For the initial server greeting */ |
| static CURLcode smtp_state_servergreet_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode/100 != 2) { |
| failf(data, "Got unexpected smtp-server response: %d", smtpcode); |
| result = CURLE_FTP_WEIRD_SERVER_REPLY; |
| } |
| else |
| result = smtp_perform_ehlo(conn); |
| |
| return result; |
| } |
| |
| /* For STARTTLS responses */ |
| static CURLcode smtp_state_starttls_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 220) { |
| if(data->set.use_ssl != CURLUSESSL_TRY) { |
| failf(data, "STARTTLS denied. %c", smtpcode); |
| result = CURLE_USE_SSL_FAILED; |
| } |
| else |
| result = smtp_perform_authenticate(conn); |
| } |
| else |
| result = smtp_perform_upgrade_tls(conn); |
| |
| return result; |
| } |
| |
| /* For EHLO responses */ |
| static CURLcode smtp_state_ehlo_resp(struct connectdata *conn, int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode/100 != 2) { |
| if((data->set.use_ssl <= CURLUSESSL_TRY || conn->ssl[FIRSTSOCKET].use) && |
| !conn->bits.user_passwd) |
| result = smtp_perform_helo(conn); |
| else { |
| failf(data, "Remote access denied: %d", smtpcode); |
| result = CURLE_REMOTE_ACCESS_DENIED; |
| } |
| } |
| else if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) { |
| /* We don't have a SSL/TLS connection yet, but SSL is requested */ |
| if(smtpc->tls_supported) |
| /* Switch to TLS connection now */ |
| result = smtp_perform_starttls(conn); |
| else if(data->set.use_ssl == CURLUSESSL_TRY) |
| /* Fallback and carry on with authentication */ |
| result = smtp_perform_authenticate(conn); |
| else { |
| failf(data, "STARTTLS not supported."); |
| result = CURLE_USE_SSL_FAILED; |
| } |
| } |
| else |
| result = smtp_perform_authenticate(conn); |
| |
| return result; |
| } |
| |
| /* For HELO responses */ |
| static CURLcode smtp_state_helo_resp(struct connectdata *conn, int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode/100 != 2) { |
| failf(data, "Remote access denied: %d", smtpcode); |
| result = CURLE_REMOTE_ACCESS_DENIED; |
| } |
| else |
| /* End of connect phase */ |
| state(conn, SMTP_STOP); |
| |
| return result; |
| } |
| |
| /* For AUTH PLAIN (without initial response) responses */ |
| static CURLcode smtp_state_auth_plain_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| size_t len = 0; |
| char *plainauth = NULL; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 334) { |
| failf(data, "Access denied: %d", smtpcode); |
| result = CURLE_LOGIN_DENIED; |
| } |
| else { |
| /* Create the authorisation message */ |
| result = Curl_sasl_create_plain_message(conn->data, conn->user, |
| conn->passwd, &plainauth, &len); |
| |
| /* Send the message */ |
| if(!result) { |
| if(plainauth) { |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", plainauth); |
| |
| if(!result) |
| state(conn, SMTP_AUTH_FINAL); |
| } |
| |
| Curl_safefree(plainauth); |
| } |
| } |
| |
| return result; |
| } |
| |
| /* For AUTH LOGIN (without initial response) responses */ |
| static CURLcode smtp_state_auth_login_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| size_t len = 0; |
| char *authuser = NULL; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 334) { |
| failf(data, "Access denied: %d", smtpcode); |
| result = CURLE_LOGIN_DENIED; |
| } |
| else { |
| /* Create the user message */ |
| result = Curl_sasl_create_login_message(conn->data, conn->user, |
| &authuser, &len); |
| |
| /* Send the user */ |
| if(!result) { |
| if(authuser) { |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", authuser); |
| |
| if(!result) |
| state(conn, SMTP_AUTH_LOGIN_PASSWD); |
| } |
| |
| Curl_safefree(authuser); |
| } |
| } |
| |
| return result; |
| } |
| |
| /* For AUTH LOGIN user entry responses */ |
| static CURLcode smtp_state_auth_login_password_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| size_t len = 0; |
| char *authpasswd = NULL; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 334) { |
| failf(data, "Access denied: %d", smtpcode); |
| result = CURLE_LOGIN_DENIED; |
| } |
| else { |
| /* Create the password message */ |
| result = Curl_sasl_create_login_message(conn->data, conn->passwd, |
| &authpasswd, &len); |
| |
| /* Send the password */ |
| if(!result) { |
| if(authpasswd) { |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", authpasswd); |
| |
| if(!result) |
| state(conn, SMTP_AUTH_FINAL); |
| } |
| |
| Curl_safefree(authpasswd); |
| } |
| } |
| |
| return result; |
| } |
| |
| #ifndef CURL_DISABLE_CRYPTO_AUTH |
| /* For AUTH CRAM-MD5 responses */ |
| static CURLcode smtp_state_auth_cram_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| char *chlg64 = data->state.buffer; |
| size_t len = 0; |
| char *rplyb64 = NULL; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 334) { |
| failf(data, "Access denied: %d", smtpcode); |
| return CURLE_LOGIN_DENIED; |
| } |
| |
| /* Get the challenge */ |
| for(chlg64 += 4; *chlg64 == ' ' || *chlg64 == '\t'; chlg64++) |
| ; |
| |
| /* Terminate the challenge */ |
| if(*chlg64 != '=') { |
| for(len = strlen(chlg64); len--;) |
| if(chlg64[len] != '\r' && chlg64[len] != '\n' && chlg64[len] != ' ' && |
| chlg64[len] != '\t') |
| break; |
| |
| if(++len) { |
| chlg64[len] = '\0'; |
| } |
| } |
| |
| /* Create the response message */ |
| result = Curl_sasl_create_cram_md5_message(data, chlg64, conn->user, |
| conn->passwd, &rplyb64, &len); |
| |
| /* Send the response */ |
| if(!result) { |
| if(rplyb64) { |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", rplyb64); |
| |
| if(!result) |
| state(conn, SMTP_AUTH_FINAL); |
| } |
| |
| Curl_safefree(rplyb64); |
| } |
| |
| return result; |
| } |
| |
| /* For AUTH DIGEST-MD5 challenge responses */ |
| static CURLcode smtp_state_auth_digest_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| char *chlg64 = data->state.buffer; |
| size_t len = 0; |
| char *rplyb64 = NULL; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 334) { |
| failf(data, "Access denied: %d", smtpcode); |
| return CURLE_LOGIN_DENIED; |
| } |
| |
| /* Get the challenge */ |
| for(chlg64 += 4; *chlg64 == ' ' || *chlg64 == '\t'; chlg64++) |
| ; |
| |
| /* Create the response message */ |
| result = Curl_sasl_create_digest_md5_message(data, chlg64, conn->user, |
| conn->passwd, "smtp", |
| &rplyb64, &len); |
| |
| /* Send the response */ |
| if(!result) { |
| if(rplyb64) { |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", rplyb64); |
| |
| if(!result) |
| state(conn, SMTP_AUTH_DIGESTMD5_RESP); |
| } |
| |
| Curl_safefree(rplyb64); |
| } |
| |
| return result; |
| } |
| |
| /* For AUTH DIGEST-MD5 challenge-response responses */ |
| static CURLcode smtp_state_auth_digest_resp_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 334) { |
| failf(data, "Authentication failed: %d", smtpcode); |
| result = CURLE_LOGIN_DENIED; |
| } |
| else { |
| /* Send an empty response */ |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", ""); |
| |
| if(!result) |
| state(conn, SMTP_AUTH_FINAL); |
| } |
| |
| return result; |
| } |
| |
| #endif |
| |
| #ifdef USE_NTLM |
| /* For AUTH NTLM (without initial response) responses */ |
| static CURLcode smtp_state_auth_ntlm_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| char *type1msg = NULL; |
| size_t len = 0; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 334) { |
| failf(data, "Access denied: %d", smtpcode); |
| result = CURLE_LOGIN_DENIED; |
| } |
| else { |
| /* Create the type-1 message */ |
| result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd, |
| &conn->ntlm, |
| &type1msg, &len); |
| |
| /* Send the message */ |
| if(!result) { |
| if(type1msg) { |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", type1msg); |
| |
| if(!result) |
| state(conn, SMTP_AUTH_NTLM_TYPE2MSG); |
| } |
| |
| Curl_safefree(type1msg); |
| } |
| } |
| |
| return result; |
| } |
| |
| /* For NTLM type-2 responses (sent in reponse to our type-1 message) */ |
| static CURLcode smtp_state_auth_ntlm_type2msg_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| char *type3msg = NULL; |
| size_t len = 0; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 334) { |
| failf(data, "Access denied: %d", smtpcode); |
| result = CURLE_LOGIN_DENIED; |
| } |
| else { |
| /* Create the type-3 message */ |
| result = Curl_sasl_create_ntlm_type3_message(data, |
| data->state.buffer + 4, |
| conn->user, conn->passwd, |
| &conn->ntlm, |
| &type3msg, &len); |
| |
| /* Send the message */ |
| if(!result) { |
| if(type3msg) { |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", type3msg); |
| |
| if(!result) |
| state(conn, SMTP_AUTH_FINAL); |
| } |
| |
| Curl_safefree(type3msg); |
| } |
| } |
| |
| return result; |
| } |
| #endif |
| |
| /* For the final responses to the AUTH sequence */ |
| static CURLcode smtp_state_auth_final_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 235) { |
| failf(data, "Authentication failed: %d", smtpcode); |
| result = CURLE_LOGIN_DENIED; |
| } |
| else |
| /* End of connect phase */ |
| state(conn, SMTP_STOP); |
| |
| return result; |
| } |
| |
| /* For MAIL responses */ |
| static CURLcode smtp_state_mail_resp(struct connectdata *conn, int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| struct SMTP *smtp = data->state.proto.smtp; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode/100 != 2) { |
| failf(data, "MAIL failed: %d", smtpcode); |
| result = CURLE_SEND_ERROR; |
| state(conn, SMTP_STOP); |
| } |
| else { |
| smtp->rcpt = data->set.mail_rcpt; |
| |
| result = smtp_perform_rcpt_to(conn); |
| } |
| |
| return result; |
| } |
| |
| /* For RCPT responses */ |
| static CURLcode smtp_state_rcpt_resp(struct connectdata *conn, int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| struct SMTP *smtp = data->state.proto.smtp; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode/100 != 2) { |
| failf(data, "RCPT failed: %d", smtpcode); |
| result = CURLE_SEND_ERROR; |
| state(conn, SMTP_STOP); |
| } |
| else { |
| if(smtp->rcpt) { |
| smtp->rcpt = smtp->rcpt->next; |
| result = smtp_perform_rcpt_to(conn); |
| |
| /* If we failed or still are sending RCPT data then return */ |
| if(result || smtp->rcpt) |
| return result; |
| } |
| |
| /* Send the DATA command */ |
| result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "DATA"); |
| |
| if(!result) |
| state(conn, SMTP_DATA); |
| } |
| |
| return result; |
| } |
| |
| /* For DATA response */ |
| static CURLcode smtp_state_data_resp(struct connectdata *conn, int smtpcode, |
| smtpstate instate) |
| { |
| struct SessionHandle *data = conn->data; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 354) { |
| state(conn, SMTP_STOP); |
| return CURLE_SEND_ERROR; |
| } |
| |
| /* Set the progress upload size */ |
| Curl_pgrsSetUploadSize(data, data->set.infilesize); |
| |
| /* SMTP upload */ |
| Curl_setup_transfer(conn, -1, -1, FALSE, NULL, FIRSTSOCKET, NULL); |
| |
| /* End of DO phase */ |
| state(conn, SMTP_STOP); |
| |
| return CURLE_OK; |
| } |
| |
| /* For POSTDATA responses, which are received after the entire DATA |
| part has been sent to the server */ |
| static CURLcode smtp_state_postdata_resp(struct connectdata *conn, |
| int smtpcode, |
| smtpstate instate) |
| { |
| CURLcode result = CURLE_OK; |
| |
| (void)instate; /* no use for this yet */ |
| |
| if(smtpcode != 250) |
| result = CURLE_RECV_ERROR; |
| |
| /* End of DONE phase */ |
| state(conn, SMTP_STOP); |
| |
| return result; |
| } |
| |
| static CURLcode smtp_statemach_act(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| curl_socket_t sock = conn->sock[FIRSTSOCKET]; |
| struct SessionHandle *data = conn->data; |
| int smtpcode; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| struct pingpong *pp = &smtpc->pp; |
| size_t nread = 0; |
| |
| /* Busy upgrading the connection; right now all I/O is SSL/TLS, not SMTP */ |
| if(smtpc->state == SMTP_UPGRADETLS) |
| return smtp_perform_upgrade_tls(conn); |
| |
| /* Flush any data that needs to be sent */ |
| if(pp->sendleft) |
| return Curl_pp_flushsend(pp); |
| |
| /* Read the response from the server */ |
| result = Curl_pp_readresp(sock, pp, &smtpcode, &nread); |
| if(result) |
| return result; |
| |
| /* Store the latest response for later retrieval */ |
| if(smtpc->state != SMTP_QUIT) |
| data->info.httpcode = smtpcode; |
| |
| if(smtpcode) { |
| /* We have now received a full SMTP server response */ |
| switch(smtpc->state) { |
| case SMTP_SERVERGREET: |
| result = smtp_state_servergreet_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_EHLO: |
| result = smtp_state_ehlo_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_HELO: |
| result = smtp_state_helo_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_STARTTLS: |
| result = smtp_state_starttls_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_AUTH_PLAIN: |
| result = smtp_state_auth_plain_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_AUTH_LOGIN: |
| result = smtp_state_auth_login_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_AUTH_LOGIN_PASSWD: |
| result = smtp_state_auth_login_password_resp(conn, smtpcode, |
| smtpc->state); |
| break; |
| |
| #ifndef CURL_DISABLE_CRYPTO_AUTH |
| case SMTP_AUTH_CRAMMD5: |
| result = smtp_state_auth_cram_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_AUTH_DIGESTMD5: |
| result = smtp_state_auth_digest_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_AUTH_DIGESTMD5_RESP: |
| result = smtp_state_auth_digest_resp_resp(conn, smtpcode, smtpc->state); |
| break; |
| #endif |
| |
| #ifdef USE_NTLM |
| case SMTP_AUTH_NTLM: |
| result = smtp_state_auth_ntlm_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_AUTH_NTLM_TYPE2MSG: |
| result = smtp_state_auth_ntlm_type2msg_resp(conn, smtpcode, |
| smtpc->state); |
| break; |
| #endif |
| |
| case SMTP_AUTH_FINAL: |
| result = smtp_state_auth_final_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_MAIL: |
| result = smtp_state_mail_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_RCPT: |
| result = smtp_state_rcpt_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_DATA: |
| result = smtp_state_data_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_POSTDATA: |
| result = smtp_state_postdata_resp(conn, smtpcode, smtpc->state); |
| break; |
| |
| case SMTP_QUIT: |
| /* fallthrough, just stop! */ |
| default: |
| /* internal error */ |
| state(conn, SMTP_STOP); |
| break; |
| } |
| } |
| |
| return result; |
| } |
| |
| /* Called repeatedly until done from multi.c */ |
| static CURLcode smtp_multi_statemach(struct connectdata *conn, bool *done) |
| { |
| CURLcode result = CURLE_OK; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| |
| if((conn->handler->flags & PROTOPT_SSL) && !smtpc->ssldone) |
| result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &smtpc->ssldone); |
| else |
| result = Curl_pp_statemach(&smtpc->pp, FALSE); |
| |
| *done = (smtpc->state == SMTP_STOP) ? TRUE : FALSE; |
| |
| return result; |
| } |
| |
| static CURLcode smtp_block_statemach(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| |
| while(smtpc->state != SMTP_STOP && !result) |
| result = Curl_pp_statemach(&smtpc->pp, TRUE); |
| |
| return result; |
| } |
| |
| /* Allocate and initialize the SMTP struct for the current SessionHandle if |
| required */ |
| static CURLcode smtp_init(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| struct SMTP *smtp = data->state.proto.smtp; |
| |
| if(!smtp) { |
| smtp = data->state.proto.smtp = calloc(sizeof(struct SMTP), 1); |
| if(!smtp) |
| result = CURLE_OUT_OF_MEMORY; |
| } |
| |
| return result; |
| } |
| |
| /* For the SMTP "protocol connect" and "doing" phases only */ |
| static int smtp_getsock(struct connectdata *conn, curl_socket_t *socks, |
| int numsocks) |
| { |
| return Curl_pp_getsock(&conn->proto.smtpc.pp, socks, numsocks); |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_connect() |
| * |
| * This function should do everything that is to be considered a part of |
| * the connection phase. |
| * |
| * The variable pointed to by 'done' will be TRUE if the protocol-layer |
| * connect phase is done when this function returns, or FALSE if not. |
| */ |
| static CURLcode smtp_connect(struct connectdata *conn, bool *done) |
| { |
| CURLcode result = CURLE_OK; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| struct pingpong *pp = &smtpc->pp; |
| |
| *done = FALSE; /* default to not done yet */ |
| |
| /* If there already is a protocol-specific struct allocated for this |
| sessionhandle, deal with it */ |
| Curl_reset_reqproto(conn); |
| |
| /* Initialise the SMTP layer */ |
| result = smtp_init(conn); |
| if(result) |
| return result; |
| |
| /* We always support persistent connections in SMTP */ |
| conn->bits.close = FALSE; |
| |
| /* Set the default response time-out */ |
| pp->response_time = RESP_TIMEOUT; |
| pp->statemach_act = smtp_statemach_act; |
| pp->endofresp = smtp_endofresp; |
| pp->conn = conn; |
| |
| /* Set the default preferred authentication mechanism */ |
| smtpc->prefmech = SASL_AUTH_ANY; |
| |
| /* Initialise the pingpong layer */ |
| Curl_pp_init(pp); |
| |
| /* Parse the URL options */ |
| result = smtp_parse_url_options(conn); |
| if(result) |
| return result; |
| |
| /* Parse the URL path */ |
| result = smtp_parse_url_path(conn); |
| if(result) |
| return result; |
| |
| /* Start off waiting for the server greeting response */ |
| state(conn, SMTP_SERVERGREET); |
| |
| result = smtp_multi_statemach(conn, done); |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_done() |
| * |
| * The DONE function. This does what needs to be done after a single DO has |
| * performed. |
| * |
| * Input argument is already checked for validity. |
| */ |
| static CURLcode smtp_done(struct connectdata *conn, CURLcode status, |
| bool premature) |
| { |
| CURLcode result = CURLE_OK; |
| struct SessionHandle *data = conn->data; |
| struct SMTP *smtp = data->state.proto.smtp; |
| struct pingpong *pp = &conn->proto.smtpc.pp; |
| const char *eob; |
| ssize_t len; |
| ssize_t bytes_written; |
| |
| (void)premature; |
| |
| if(!smtp) |
| /* When the easy handle is removed from the multi interface while libcurl |
| is still trying to resolve the host name, the SMTP struct is not yet |
| initialized. However, the removal action calls Curl_done() which in |
| turn calls this function, so we simply return success. */ |
| return CURLE_OK; |
| |
| if(status) { |
| conn->bits.close = TRUE; /* marked for closure */ |
| result = status; /* use the already set error code */ |
| } |
| else if(!data->set.connect_only) { |
| /* Calculate the EOB taking into account any terminating CRLF from the |
| previous line of the email or the CRLF of the DATA command when there |
| is "no mail data". RFC-5321, sect. 4.1.1.4. */ |
| eob = SMTP_EOB; |
| len = SMTP_EOB_LEN; |
| if(smtp->trailing_crlf || !conn->data->set.infilesize) { |
| eob += 2; |
| len -= 2; |
| } |
| |
| /* Send the end of block data */ |
| result = Curl_write(conn, conn->writesockfd, eob, len, &bytes_written); |
| if(result) |
| return result; |
| |
| if(bytes_written != len) { |
| /* The whole chunk was not sent so keep it around and adjust the |
| pingpong structure accordingly */ |
| pp->sendthis = strdup(eob); |
| pp->sendsize = len; |
| pp->sendleft = len - bytes_written; |
| } |
| else |
| /* Successfully sent so adjust the response timeout relative to now */ |
| pp->response = Curl_tvnow(); |
| |
| state(conn, SMTP_POSTDATA); |
| |
| /* Run the state-machine |
| |
| TODO: when the multi interface is used, this _really_ should be using |
| the smtp_multi_statemach function but we have no general support for |
| non-blocking DONE operations, not in the multi state machine and with |
| Curl_done() invokes on several places in the code! |
| */ |
| result = smtp_block_statemach(conn); |
| } |
| |
| /* Clear the transfer mode for the next request */ |
| smtp->transfer = FTPTRANSFER_BODY; |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_perform() |
| * |
| * This is the actual DO function for SMTP. Send a mail according to the |
| * options previously setup. |
| */ |
| static CURLcode smtp_perform(struct connectdata *conn, bool *connected, |
| bool *dophase_done) |
| { |
| /* This is SMTP and no proxy */ |
| CURLcode result = CURLE_OK; |
| |
| DEBUGF(infof(conn->data, "DO phase starts\n")); |
| |
| if(conn->data->set.opt_no_body) { |
| /* Requested no body means no transfer */ |
| struct SMTP *smtp = conn->data->state.proto.smtp; |
| smtp->transfer = FTPTRANSFER_INFO; |
| } |
| |
| *dophase_done = FALSE; /* not done yet */ |
| |
| /* Start the first command in the DO phase */ |
| result = smtp_perform_mail(conn); |
| if(result) |
| return result; |
| |
| /* run the state-machine */ |
| result = smtp_multi_statemach(conn, dophase_done); |
| |
| *connected = conn->bits.tcpconnect[FIRSTSOCKET]; |
| |
| if(*dophase_done) |
| DEBUGF(infof(conn->data, "DO phase is complete\n")); |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_do() |
| * |
| * This function is registered as 'curl_do' function. It decodes the path |
| * parts etc as a wrapper to the actual DO function (smtp_perform). |
| * |
| * The input argument is already checked for validity. |
| */ |
| static CURLcode smtp_do(struct connectdata *conn, bool *done) |
| { |
| CURLcode result = CURLE_OK; |
| |
| *done = FALSE; /* default to false */ |
| |
| /* Since connections can be re-used between SessionHandles, there might be a |
| connection already existing but on a fresh SessionHandle struct. As such |
| we make sure we have a good SMTP struct to play with. For new connections |
| the SMTP struct is allocated and setup in the smtp_connect() function. */ |
| Curl_reset_reqproto(conn); |
| result = smtp_init(conn); |
| if(result) |
| return result; |
| |
| result = smtp_regular_transfer(conn, done); |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_disconnect() |
| * |
| * Disconnect from an SMTP server. Cleanup protocol-specific per-connection |
| * resources. BLOCKING. |
| */ |
| static CURLcode smtp_disconnect(struct connectdata *conn, |
| bool dead_connection) |
| { |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| |
| /* We cannot send quit unconditionally. If this connection is stale or |
| bad in any way, sending quit and waiting around here will make the |
| disconnect wait in vain and cause more problems than we need to. */ |
| |
| /* The SMTP session may or may not have been allocated/setup at this |
| point! */ |
| if(!dead_connection && smtpc->pp.conn) |
| if(!smtp_perform_quit(conn)) |
| (void)smtp_block_statemach(conn); /* ignore errors on QUIT */ |
| |
| /* Disconnect from the server */ |
| Curl_pp_disconnect(&smtpc->pp); |
| |
| /* Cleanup the SASL module */ |
| Curl_sasl_cleanup(conn, smtpc->authused); |
| |
| /* Cleanup our connection based variables */ |
| Curl_safefree(smtpc->domain); |
| |
| return CURLE_OK; |
| } |
| |
| /* Call this when the DO phase has completed */ |
| static CURLcode smtp_dophase_done(struct connectdata *conn, bool connected) |
| { |
| struct SMTP *smtp = conn->data->state.proto.smtp; |
| |
| (void)connected; |
| |
| if(smtp->transfer != FTPTRANSFER_BODY) |
| /* no data to transfer */ |
| Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL); |
| |
| return CURLE_OK; |
| } |
| |
| /* Called from multi.c while DOing */ |
| static CURLcode smtp_doing(struct connectdata *conn, bool *dophase_done) |
| { |
| CURLcode result = smtp_multi_statemach(conn, dophase_done); |
| |
| if(result) |
| DEBUGF(infof(conn->data, "DO phase failed\n")); |
| else if(*dophase_done) { |
| result = smtp_dophase_done(conn, FALSE /* not connected */); |
| |
| DEBUGF(infof(conn->data, "DO phase is complete\n")); |
| } |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_regular_transfer() |
| * |
| * The input argument is already checked for validity. |
| * |
| * Performs all commands done before a regular transfer between a local and a |
| * remote host. |
| */ |
| static CURLcode smtp_regular_transfer(struct connectdata *conn, |
| bool *dophase_done) |
| { |
| CURLcode result = CURLE_OK; |
| bool connected = FALSE; |
| struct SessionHandle *data = conn->data; |
| |
| /* Make sure size is unknown at this point */ |
| data->req.size = -1; |
| |
| /* Set the progress data */ |
| Curl_pgrsSetUploadCounter(data, 0); |
| Curl_pgrsSetDownloadCounter(data, 0); |
| Curl_pgrsSetUploadSize(data, 0); |
| Curl_pgrsSetDownloadSize(data, 0); |
| |
| /* Carry out the perform */ |
| result = smtp_perform(conn, &connected, dophase_done); |
| |
| /* Perform post DO phase operations if necessary */ |
| if(!result && *dophase_done) |
| result = smtp_dophase_done(conn, connected); |
| |
| return result; |
| } |
| |
| static CURLcode smtp_setup_connection(struct connectdata *conn) |
| { |
| struct SessionHandle *data = conn->data; |
| |
| if(conn->bits.httpproxy && !data->set.tunnel_thru_httpproxy) { |
| /* Unless we have asked to tunnel SMTP operations through the proxy, we |
| switch and use HTTP operations only */ |
| #ifndef CURL_DISABLE_HTTP |
| if(conn->handler == &Curl_handler_smtp) |
| conn->handler = &Curl_handler_smtp_proxy; |
| else { |
| #ifdef USE_SSL |
| conn->handler = &Curl_handler_smtps_proxy; |
| #else |
| failf(data, "SMTPS not supported!"); |
| return CURLE_UNSUPPORTED_PROTOCOL; |
| #endif |
| } |
| |
| /* We explicitly mark this connection as persistent here as we're doing |
| SMTP over HTTP and thus we accidentally avoid setting this value |
| otherwise */ |
| conn->bits.close = FALSE; |
| #else |
| failf(data, "SMTP over http proxy requires HTTP support built-in!"); |
| return CURLE_UNSUPPORTED_PROTOCOL; |
| #endif |
| } |
| |
| data->state.path++; /* don't include the initial slash */ |
| |
| return CURLE_OK; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_parse_url_options() |
| * |
| * Parse the URL login options. |
| */ |
| static CURLcode smtp_parse_url_options(struct connectdata *conn) |
| { |
| CURLcode result = CURLE_OK; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| const char *options = conn->options; |
| const char *ptr = options; |
| |
| if(options) { |
| const char *key = ptr; |
| |
| while(*ptr && *ptr != '=') |
| ptr++; |
| |
| if(strnequal(key, "AUTH", 4)) { |
| const char *value = ptr + 1; |
| |
| if(strequal(value, "*")) |
| smtpc->prefmech = SASL_AUTH_ANY; |
| else if(strequal(value, "LOGIN")) |
| smtpc->prefmech = SASL_MECH_LOGIN; |
| else if(strequal(value, "PLAIN")) |
| smtpc->prefmech = SASL_MECH_PLAIN; |
| else if(strequal(value, "CRAM-MD5")) |
| smtpc->prefmech = SASL_MECH_CRAM_MD5; |
| else if(strequal(value, "DIGEST-MD5")) |
| smtpc->prefmech = SASL_MECH_DIGEST_MD5; |
| else if(strequal(value, "GSSAPI")) |
| smtpc->prefmech = SASL_MECH_GSSAPI; |
| else if(strequal(value, "NTLM")) |
| smtpc->prefmech = SASL_MECH_NTLM; |
| else |
| smtpc->prefmech = SASL_AUTH_NONE; |
| } |
| else |
| result = CURLE_URL_MALFORMAT; |
| } |
| |
| return result; |
| } |
| |
| /*********************************************************************** |
| * |
| * smtp_parse_url_path() |
| * |
| * Parse the URL path into separate path components. |
| */ |
| static CURLcode smtp_parse_url_path(struct connectdata *conn) |
| { |
| /* The SMTP struct is already initialised in smtp_connect() */ |
| struct SessionHandle *data = conn->data; |
| struct smtp_conn *smtpc = &conn->proto.smtpc; |
| const char *path = data->state.path; |
| char localhost[HOSTNAME_MAX + 1]; |
| |
| /* Calculate the path if necessary */ |
| if(!*path) { |
| if(!Curl_gethostname(localhost, sizeof(localhost))) |
| path = localhost; |
| else |
| path = "localhost"; |
| } |
| |
| /* URL decode the path and use it as the domain in our EHLO */ |
| return Curl_urldecode(conn->data, path, 0, &smtpc->domain, NULL, TRUE); |
| } |
| |
| CURLcode Curl_smtp_escape_eob(struct connectdata *conn, ssize_t nread) |
| { |
| /* When sending a SMTP payload we must detect CRLF. sequences making sure |
| they are sent as CRLF.. instead, as a . on the beginning of a line will |
| be deleted by the server when not part of an EOB terminator and a |
| genuine CRLF.CRLF which isn't escaped will wrongly be detected as end of |
| data by the server |
| */ |
| ssize_t i; |
| ssize_t si; |
| struct SessionHandle *data = conn->data; |
| struct SMTP *smtp = data->state.proto.smtp; |
| |
| /* Do we need to allocate the scatch buffer? */ |
| if(!data->state.scratch) { |
| data->state.scratch = malloc(2 * BUFSIZE); |
| |
| if(!data->state.scratch) { |
| failf (data, "Failed to alloc scratch buffer!"); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| } |
| |
| /* This loop can be improved by some kind of Boyer-Moore style of |
| approach but that is saved for later... */ |
| for(i = 0, si = 0; i < nread; i++) { |
| if(SMTP_EOB[smtp->eob] == data->req.upload_fromhere[i]) { |
| smtp->eob++; |
| |
| /* Is the EOB potentially the terminating CRLF? */ |
| if(2 == smtp->eob || SMTP_EOB_LEN == smtp->eob) |
| smtp->trailing_crlf = TRUE; |
| else |
| smtp->trailing_crlf = FALSE; |
| } |
| else if(smtp->eob) { |
| /* A previous substring matched so output that first */ |
| memcpy(&data->state.scratch[si], SMTP_EOB, smtp->eob); |
| si += smtp->eob; |
| |
| /* Then compare the first byte */ |
| if(SMTP_EOB[0] == data->req.upload_fromhere[i]) |
| smtp->eob = 1; |
| else |
| smtp->eob = 0; |
| |
| /* Reset the trailing CRLF flag as there was more data */ |
| smtp->trailing_crlf = FALSE; |
| } |
| |
| /* Do we have a match for CRLF. as per RFC-5321, sect. 4.5.2 */ |
| if(SMTP_EOB_FIND_LEN == smtp->eob) { |
| /* Copy the replacement data to the target buffer */ |
| memcpy(&data->state.scratch[si], SMTP_EOB_REPL, SMTP_EOB_REPL_LEN); |
| si += SMTP_EOB_REPL_LEN; |
| smtp->eob = 0; |
| } |
| else if(!smtp->eob) |
| data->state.scratch[si++] = data->req.upload_fromhere[i]; |
| } |
| |
| if(smtp->eob) { |
| /* A substring matched before processing ended so output that now */ |
| memcpy(&data->state.scratch[si], SMTP_EOB, smtp->eob); |
| si += smtp->eob; |
| smtp->eob = 0; |
| } |
| |
| if(si != nread) { |
| /* Only use the new buffer if we replaced something */ |
| nread = si; |
| |
| /* Upload from the new (replaced) buffer instead */ |
| data->req.upload_fromhere = data->state.scratch; |
| |
| /* Set the new amount too */ |
| data->req.upload_present = nread; |
| } |
| |
| return CURLE_OK; |
| } |
| |
| #endif /* CURL_DISABLE_SMTP */ |
