1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 * RFC1734 POP3 Authentication
22 * RFC1939 POP3 protocol
23 * RFC2195 CRAM-MD5 authentication
24 * RFC2384 POP URL Scheme
25 * RFC2449 POP3 Extension Mechanism
26 * RFC2595 Using TLS with IMAP, POP3 and ACAP
27 * RFC2831 DIGEST-MD5 authentication
28 * RFC4422 Simple Authentication and Security Layer (SASL)
29 * RFC4616 PLAIN authentication
30 * RFC5034 POP3 SASL Authentication Mechanism
32 ***************************************************************************/
34 #include "curl_setup.h"
36 #ifndef CURL_DISABLE_POP3
38 #ifdef HAVE_NETINET_IN_H
39 #include <netinet/in.h>
41 #ifdef HAVE_ARPA_INET_H
42 #include <arpa/inet.h>
45 #include <sys/utsname.h>
55 #if (defined(NETWARE) && defined(__NOVELL_LIBC__))
57 #define in_addr_t unsigned long
60 #include <curl/curl.h>
68 #include "http.h" /* for HTTP proxy tunnel stuff */
72 #include "strtoofft.h"
81 #include "curl_sasl.h"
85 #define _MPRINTF_REPLACE /* use our functions only */
86 #include <curl/mprintf.h>
88 #include "curl_memory.h"
89 /* The last #include file should be: */
92 /* Local API functions */
93 static CURLcode pop3_regular_transfer(struct connectdata *conn, bool *done);
94 static CURLcode pop3_do(struct connectdata *conn, bool *done);
95 static CURLcode pop3_done(struct connectdata *conn, CURLcode status,
97 static CURLcode pop3_connect(struct connectdata *conn, bool *done);
98 static CURLcode pop3_disconnect(struct connectdata *conn, bool dead);
99 static CURLcode pop3_multi_statemach(struct connectdata *conn, bool *done);
100 static int pop3_getsock(struct connectdata *conn, curl_socket_t *socks,
102 static CURLcode pop3_doing(struct connectdata *conn, bool *dophase_done);
103 static CURLcode pop3_setup_connection(struct connectdata *conn);
104 static CURLcode pop3_parse_url_options(struct connectdata *conn);
105 static CURLcode pop3_parse_url_path(struct connectdata *conn);
106 static CURLcode pop3_parse_custom_request(struct connectdata *conn);
109 * POP3 protocol handler.
112 const struct Curl_handler Curl_handler_pop3 = {
114 pop3_setup_connection, /* setup_connection */
116 pop3_done, /* done */
117 ZERO_NULL, /* do_more */
118 pop3_connect, /* connect_it */
119 pop3_multi_statemach, /* connecting */
120 pop3_doing, /* doing */
121 pop3_getsock, /* proto_getsock */
122 pop3_getsock, /* doing_getsock */
123 ZERO_NULL, /* domore_getsock */
124 ZERO_NULL, /* perform_getsock */
125 pop3_disconnect, /* disconnect */
126 ZERO_NULL, /* readwrite */
127 PORT_POP3, /* defport */
128 CURLPROTO_POP3, /* protocol */
129 PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY /* flags */
134 * POP3S protocol handler.
137 const struct Curl_handler Curl_handler_pop3s = {
138 "POP3S", /* scheme */
139 pop3_setup_connection, /* setup_connection */
141 pop3_done, /* done */
142 ZERO_NULL, /* do_more */
143 pop3_connect, /* connect_it */
144 pop3_multi_statemach, /* connecting */
145 pop3_doing, /* doing */
146 pop3_getsock, /* proto_getsock */
147 pop3_getsock, /* doing_getsock */
148 ZERO_NULL, /* domore_getsock */
149 ZERO_NULL, /* perform_getsock */
150 pop3_disconnect, /* disconnect */
151 ZERO_NULL, /* readwrite */
152 PORT_POP3S, /* defport */
153 CURLPROTO_POP3 | CURLPROTO_POP3S, /* protocol */
154 PROTOPT_CLOSEACTION | PROTOPT_SSL
155 | PROTOPT_NOURLQUERY /* flags */
159 #ifndef CURL_DISABLE_HTTP
161 * HTTP-proxyed POP3 protocol handler.
164 static const struct Curl_handler Curl_handler_pop3_proxy = {
166 ZERO_NULL, /* setup_connection */
167 Curl_http, /* do_it */
168 Curl_http_done, /* done */
169 ZERO_NULL, /* do_more */
170 ZERO_NULL, /* connect_it */
171 ZERO_NULL, /* connecting */
172 ZERO_NULL, /* doing */
173 ZERO_NULL, /* proto_getsock */
174 ZERO_NULL, /* doing_getsock */
175 ZERO_NULL, /* domore_getsock */
176 ZERO_NULL, /* perform_getsock */
177 ZERO_NULL, /* disconnect */
178 ZERO_NULL, /* readwrite */
179 PORT_POP3, /* defport */
180 CURLPROTO_HTTP, /* protocol */
181 PROTOPT_NONE /* flags */
186 * HTTP-proxyed POP3S protocol handler.
189 static const struct Curl_handler Curl_handler_pop3s_proxy = {
190 "POP3S", /* scheme */
191 ZERO_NULL, /* setup_connection */
192 Curl_http, /* do_it */
193 Curl_http_done, /* done */
194 ZERO_NULL, /* do_more */
195 ZERO_NULL, /* connect_it */
196 ZERO_NULL, /* connecting */
197 ZERO_NULL, /* doing */
198 ZERO_NULL, /* proto_getsock */
199 ZERO_NULL, /* doing_getsock */
200 ZERO_NULL, /* domore_getsock */
201 ZERO_NULL, /* perform_getsock */
202 ZERO_NULL, /* disconnect */
203 ZERO_NULL, /* readwrite */
204 PORT_POP3S, /* defport */
205 CURLPROTO_HTTP, /* protocol */
206 PROTOPT_NONE /* flags */
212 static void pop3_to_pop3s(struct connectdata *conn)
214 conn->handler = &Curl_handler_pop3s;
217 #define pop3_to_pop3s(x) Curl_nop_stmt
220 /***********************************************************************
224 * Checks for an ending POP3 status code at the start of the given string, but
225 * also detects the APOP timestamp from the server greeting and various
226 * capabilities from the CAPA response including the supported authentication
227 * types and allowed SASL mechanisms.
229 static bool pop3_endofresp(struct connectdata *conn, char *line, size_t len,
232 struct pop3_conn *pop3c = &conn->proto.pop3c;
236 /* Do we have an error response? */
237 if(len >= 4 && !memcmp("-ERR", line, 4)) {
243 /* Are we processing servergreet responses? */
244 if(pop3c->state == POP3_SERVERGREET) {
245 /* Look for the APOP timestamp */
246 if(len >= 3 && line[len - 3] == '>') {
247 for(i = 0; i < len - 3; ++i) {
249 /* Calculate the length of the timestamp */
250 size_t timestamplen = len - 2 - i;
252 /* Allocate some memory for the timestamp */
253 pop3c->apoptimestamp = (char *)calloc(1, timestamplen + 1);
255 if(!pop3c->apoptimestamp)
258 /* Copy the timestamp */
259 memcpy(pop3c->apoptimestamp, line + i, timestamplen);
260 pop3c->apoptimestamp[timestamplen] = '\0';
266 /* Are we processing CAPA command responses? */
267 else if(pop3c->state == POP3_CAPA) {
268 /* Do we have the terminating line? */
269 if(len >= 1 && !memcmp(line, ".", 1)) {
275 /* Does the server support the STLS capability? */
276 if(len >= 4 && !memcmp(line, "STLS", 4))
277 pop3c->tls_supported = TRUE;
279 /* Does the server support clear text authentication? */
280 else if(len >= 4 && !memcmp(line, "USER", 4))
281 pop3c->authtypes |= POP3_TYPE_CLEARTEXT;
283 /* Does the server support APOP authentication? */
284 else if(len >= 4 && !memcmp(line, "APOP", 4))
285 pop3c->authtypes |= POP3_TYPE_APOP;
287 /* Does the server support SASL based authentication? */
288 else if(len >= 5 && !memcmp(line, "SASL ", 5)) {
289 pop3c->authtypes |= POP3_TYPE_SASL;
291 /* Advance past the SASL keyword */
295 /* Loop through the data line */
298 (*line == ' ' || *line == '\t' ||
299 *line == '\r' || *line == '\n')) {
308 /* Extract the word */
309 for(wordlen = 0; wordlen < len && line[wordlen] != ' ' &&
310 line[wordlen] != '\t' && line[wordlen] != '\r' &&
311 line[wordlen] != '\n';)
314 /* Test the word for a matching authentication mechanism */
315 if(wordlen == 5 && !memcmp(line, "LOGIN", 5))
316 pop3c->authmechs |= SASL_MECH_LOGIN;
317 else if(wordlen == 5 && !memcmp(line, "PLAIN", 5))
318 pop3c->authmechs |= SASL_MECH_PLAIN;
319 else if(wordlen == 8 && !memcmp(line, "CRAM-MD5", 8))
320 pop3c->authmechs |= SASL_MECH_CRAM_MD5;
321 else if(wordlen == 10 && !memcmp(line, "DIGEST-MD5", 10))
322 pop3c->authmechs |= SASL_MECH_DIGEST_MD5;
323 else if(wordlen == 6 && !memcmp(line, "GSSAPI", 6))
324 pop3c->authmechs |= SASL_MECH_GSSAPI;
325 else if(wordlen == 8 && !memcmp(line, "EXTERNAL", 8))
326 pop3c->authmechs |= SASL_MECH_EXTERNAL;
327 else if(wordlen == 4 && !memcmp(line, "NTLM", 4))
328 pop3c->authmechs |= SASL_MECH_NTLM;
338 /* Do we have a command or continuation response? */
339 if((len >= 3 && !memcmp("+OK", line, 3)) ||
340 (len >= 1 && !memcmp("+", line, 1))) {
346 return FALSE; /* Nothing for us */
349 /***********************************************************************
353 * This is the ONLY way to change POP3 state!
355 static void state(struct connectdata *conn, pop3state newstate)
357 struct pop3_conn *pop3c = &conn->proto.pop3c;
358 #if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
359 /* for debug purposes */
360 static const char * const names[] = {
371 "AUTH_DIGESTMD5_RESP",
373 "AUTH_NTLM_TYPE2MSG",
383 if(pop3c->state != newstate)
384 infof(conn->data, "POP3 %p state change from %s to %s\n",
385 pop3c, names[pop3c->state], names[newstate]);
388 pop3c->state = newstate;
391 /***********************************************************************
393 * pop3_perform_capa()
395 * Sends the CAPA command in order to obtain a list of server side supported
398 static CURLcode pop3_perform_capa(struct connectdata *conn)
400 CURLcode result = CURLE_OK;
401 struct pop3_conn *pop3c = &conn->proto.pop3c;
403 pop3c->authmechs = 0; /* No known authentication mechanisms yet */
404 pop3c->authused = 0; /* Clear the authentication mechanism used */
405 pop3c->tls_supported = FALSE; /* Clear the TLS capability */
407 /* Send the CAPA command */
408 result = Curl_pp_sendf(&pop3c->pp, "CAPA");
411 state(conn, POP3_CAPA);
416 /***********************************************************************
418 * pop3_perform_starttls()
420 * Sends the STLS command to start the upgrade to TLS.
422 static CURLcode pop3_perform_starttls(struct connectdata *conn)
424 CURLcode result = CURLE_OK;
426 /* Send the STLS command */
427 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "STLS");
430 state(conn, POP3_STARTTLS);
435 /***********************************************************************
437 * pop3_perform_upgrade_tls()
439 * Performs the upgrade to TLS.
441 static CURLcode pop3_perform_upgrade_tls(struct connectdata *conn)
443 CURLcode result = CURLE_OK;
444 struct pop3_conn *pop3c = &conn->proto.pop3c;
446 /* Start the SSL connection */
447 result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &pop3c->ssldone);
450 if(pop3c->state != POP3_UPGRADETLS)
451 state(conn, POP3_UPGRADETLS);
455 result = pop3_perform_capa(conn);
462 /***********************************************************************
464 * pop3_perform_user()
466 * Sends a clear text USER command to authenticate with.
468 static CURLcode pop3_perform_user(struct connectdata *conn)
470 CURLcode result = CURLE_OK;
472 /* Check we have a username and password to authenticate with and end the
473 connect phase if we don't */
474 if(!conn->bits.user_passwd) {
475 state(conn, POP3_STOP);
480 /* Send the USER command */
481 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "USER %s",
482 conn->user ? conn->user : "");
484 state(conn, POP3_USER);
489 #ifndef CURL_DISABLE_CRYPTO_AUTH
490 /***********************************************************************
492 * pop3_perform_apop()
494 * Sends an APOP command to authenticate with.
496 static CURLcode pop3_perform_apop(struct connectdata *conn)
498 CURLcode result = CURLE_OK;
499 struct pop3_conn *pop3c = &conn->proto.pop3c;
502 unsigned char digest[MD5_DIGEST_LEN];
503 char secret[2 * MD5_DIGEST_LEN + 1];
505 /* Check we have a username and password to authenticate with and end the
506 connect phase if we don't */
507 if(!conn->bits.user_passwd) {
508 state(conn, POP3_STOP);
513 /* Create the digest */
514 ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
516 return CURLE_OUT_OF_MEMORY;
518 Curl_MD5_update(ctxt, (const unsigned char *) pop3c->apoptimestamp,
519 curlx_uztoui(strlen(pop3c->apoptimestamp)));
521 Curl_MD5_update(ctxt, (const unsigned char *) conn->passwd,
522 curlx_uztoui(strlen(conn->passwd)));
524 /* Finalise the digest */
525 Curl_MD5_final(ctxt, digest);
527 /* Convert the calculated 16 octet digest into a 32 byte hex string */
528 for(i = 0; i < MD5_DIGEST_LEN; i++)
529 snprintf(&secret[2 * i], 3, "%02x", digest[i]);
531 result = Curl_pp_sendf(&pop3c->pp, "APOP %s %s", conn->user, secret);
534 state(conn, POP3_APOP);
540 /***********************************************************************
542 * pop3_perform_authenticate()
544 * Sends an AUTH command allowing the client to login with the appropriate
545 * SASL authentication mechanism.
547 * Additionally, the function will perform fallback to APOP and USER commands
548 * should a common mechanism not be available between the client and server.
550 static CURLcode pop3_perform_authenticate(struct connectdata *conn)
552 CURLcode result = CURLE_OK;
553 struct pop3_conn *pop3c = &conn->proto.pop3c;
554 const char *mech = NULL;
555 pop3state authstate = POP3_STOP;
557 /* Check we have a username and password to authenticate with and end the
558 connect phase if we don't */
559 if(!conn->bits.user_passwd) {
560 state(conn, POP3_STOP);
565 /* Calculate the supported authentication mechanism by decreasing order of
567 if(pop3c->authtypes & POP3_TYPE_SASL) {
568 #ifndef CURL_DISABLE_CRYPTO_AUTH
569 if((pop3c->authmechs & SASL_MECH_DIGEST_MD5) &&
570 (pop3c->prefmech & SASL_MECH_DIGEST_MD5)) {
572 authstate = POP3_AUTH_DIGESTMD5;
573 pop3c->authused = SASL_MECH_DIGEST_MD5;
575 else if((pop3c->authmechs & SASL_MECH_CRAM_MD5) &&
576 (pop3c->prefmech & SASL_MECH_CRAM_MD5)) {
578 authstate = POP3_AUTH_CRAMMD5;
579 pop3c->authused = SASL_MECH_CRAM_MD5;
584 if((pop3c->authmechs & SASL_MECH_NTLM) &&
585 (pop3c->prefmech & SASL_MECH_NTLM)) {
587 authstate = POP3_AUTH_NTLM;
588 pop3c->authused = SASL_MECH_NTLM;
592 if((pop3c->authmechs & SASL_MECH_LOGIN) &&
593 (pop3c->prefmech & SASL_MECH_LOGIN)) {
595 authstate = POP3_AUTH_LOGIN;
596 pop3c->authused = SASL_MECH_LOGIN;
598 else if((pop3c->authmechs & SASL_MECH_PLAIN) &&
599 (pop3c->prefmech & SASL_MECH_PLAIN)) {
601 authstate = POP3_AUTH_PLAIN;
602 pop3c->authused = SASL_MECH_PLAIN;
606 if(mech && (pop3c->preftype & POP3_TYPE_SASL)) {
607 /* Perform SASL based authentication */
608 result = Curl_pp_sendf(&pop3c->pp, "AUTH %s", mech);
611 state(conn, authstate);
613 #ifndef CURL_DISABLE_CRYPTO_AUTH
614 else if((pop3c->authtypes & POP3_TYPE_APOP) &&
615 (pop3c->preftype & POP3_TYPE_APOP))
616 /* Perform APOP authentication */
617 result = pop3_perform_apop(conn);
619 else if((pop3c->authtypes & POP3_TYPE_CLEARTEXT) &&
620 (pop3c->preftype & POP3_TYPE_CLEARTEXT))
621 /* Perform clear text authentication */
622 result = pop3_perform_user(conn);
624 /* Other mechanisms not supported */
625 infof(conn->data, "No known authentication mechanisms supported!\n");
626 result = CURLE_LOGIN_DENIED;
632 /***********************************************************************
634 * pop3_perform_command()
636 * Sends a POP3 based command.
638 static CURLcode pop3_perform_command(struct connectdata *conn)
640 CURLcode result = CURLE_OK;
641 struct SessionHandle *data = conn->data;
642 struct POP3 *pop3 = data->state.proto.pop3;
643 const char *command = NULL;
645 /* Calculate the default command */
646 if(pop3->id[0] == '\0' || conn->data->set.ftp_list_only) {
649 if(pop3->id[0] != '\0')
650 /* Message specific LIST so skip the BODY transfer */
651 pop3->transfer = FTPTRANSFER_INFO;
656 /* Send the command */
657 if(pop3->id[0] != '\0')
658 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s %s",
659 (pop3->custom && pop3->custom[0] != '\0' ?
660 pop3->custom : command), pop3->id);
662 result = Curl_pp_sendf(&conn->proto.pop3c.pp,
663 (pop3->custom && pop3->custom[0] != '\0' ?
664 pop3->custom : command));
667 state(conn, POP3_COMMAND);
672 /***********************************************************************
674 * pop3_perform_quit()
676 * Performs the quit action prior to sclose() be called.
678 static CURLcode pop3_perform_quit(struct connectdata *conn)
680 CURLcode result = CURLE_OK;
682 /* Send the QUIT command */
683 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "QUIT");
686 state(conn, POP3_QUIT);
691 /* For the initial server greeting */
692 static CURLcode pop3_state_servergreet_resp(struct connectdata *conn,
696 CURLcode result = CURLE_OK;
697 struct SessionHandle *data = conn->data;
699 (void)instate; /* no use for this yet */
701 if(pop3code != '+') {
702 failf(data, "Got unexpected pop3-server response");
703 result = CURLE_FTP_WEIRD_SERVER_REPLY;
706 result = pop3_perform_capa(conn);
711 /* For CAPA responses */
712 static CURLcode pop3_state_capa_resp(struct connectdata *conn, int pop3code,
715 CURLcode result = CURLE_OK;
716 struct SessionHandle *data = conn->data;
717 struct pop3_conn *pop3c = &conn->proto.pop3c;
719 (void)instate; /* no use for this yet */
722 result = pop3_perform_user(conn);
723 else if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) {
724 /* We don't have a SSL/TLS connection yet, but SSL is requested */
725 if(pop3c->tls_supported)
726 /* Switch to TLS connection now */
727 result = pop3_perform_starttls(conn);
728 else if(data->set.use_ssl == CURLUSESSL_TRY)
729 /* Fallback and carry on with authentication */
730 result = pop3_perform_authenticate(conn);
732 failf(data, "STLS not supported.");
733 result = CURLE_USE_SSL_FAILED;
737 result = pop3_perform_authenticate(conn);
742 /* For STARTTLS responses */
743 static CURLcode pop3_state_starttls_resp(struct connectdata *conn,
747 CURLcode result = CURLE_OK;
748 struct SessionHandle *data = conn->data;
750 (void)instate; /* no use for this yet */
752 if(pop3code != '+') {
753 if(data->set.use_ssl != CURLUSESSL_TRY) {
754 failf(data, "STARTTLS denied. %c", pop3code);
755 result = CURLE_USE_SSL_FAILED;
758 result = pop3_perform_authenticate(conn);
761 result = pop3_perform_upgrade_tls(conn);
766 /* For AUTH PLAIN responses */
767 static CURLcode pop3_state_auth_plain_resp(struct connectdata *conn,
771 CURLcode result = CURLE_OK;
772 struct SessionHandle *data = conn->data;
774 char *plainauth = NULL;
776 (void)instate; /* no use for this yet */
778 if(pop3code != '+') {
779 failf(data, "Access denied. %c", pop3code);
780 result = CURLE_LOGIN_DENIED;
783 /* Create the authorisation message */
784 result = Curl_sasl_create_plain_message(data, conn->user, conn->passwd,
787 /* Send the message */
790 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", plainauth);
793 state(conn, POP3_AUTH_FINAL);
796 Curl_safefree(plainauth);
803 /* For AUTH LOGIN responses */
804 static CURLcode pop3_state_auth_login_resp(struct connectdata *conn,
808 CURLcode result = CURLE_OK;
809 struct SessionHandle *data = conn->data;
811 char *authuser = NULL;
813 (void)instate; /* no use for this yet */
815 if(pop3code != '+') {
816 failf(data, "Access denied: %d", pop3code);
817 result = CURLE_LOGIN_DENIED;
820 /* Create the user message */
821 result = Curl_sasl_create_login_message(data, conn->user,
827 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", authuser);
830 state(conn, POP3_AUTH_LOGIN_PASSWD);
833 Curl_safefree(authuser);
840 /* For AUTH LOGIN user entry responses */
841 static CURLcode pop3_state_auth_login_password_resp(struct connectdata *conn,
845 CURLcode result = CURLE_OK;
846 struct SessionHandle *data = conn->data;
848 char *authpasswd = NULL;
850 (void)instate; /* no use for this yet */
852 if(pop3code != '+') {
853 failf(data, "Access denied: %d", pop3code);
854 result = CURLE_LOGIN_DENIED;
857 /* Create the password message */
858 result = Curl_sasl_create_login_message(data, conn->passwd,
861 /* Send the password */
864 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", authpasswd);
867 state(conn, POP3_AUTH_FINAL);
870 Curl_safefree(authpasswd);
877 #ifndef CURL_DISABLE_CRYPTO_AUTH
878 /* For AUTH CRAM-MD5 responses */
879 static CURLcode pop3_state_auth_cram_resp(struct connectdata *conn,
883 CURLcode result = CURLE_OK;
884 struct SessionHandle *data = conn->data;
885 char *chlg64 = data->state.buffer;
887 char *rplyb64 = NULL;
889 (void)instate; /* no use for this yet */
891 if(pop3code != '+') {
892 failf(data, "Access denied: %d", pop3code);
893 return CURLE_LOGIN_DENIED;
896 /* Get the challenge */
897 for(chlg64 += 2; *chlg64 == ' ' || *chlg64 == '\t'; chlg64++)
900 /* Terminate the challenge */
902 for(len = strlen(chlg64); len--;)
903 if(chlg64[len] != '\r' && chlg64[len] != '\n' && chlg64[len] != ' ' &&
912 /* Create the response message */
913 result = Curl_sasl_create_cram_md5_message(data, chlg64, conn->user,
914 conn->passwd, &rplyb64, &len);
916 /* Send the response */
919 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", rplyb64);
922 state(conn, POP3_AUTH_FINAL);
925 Curl_safefree(rplyb64);
931 /* For AUTH DIGEST-MD5 challenge responses */
932 static CURLcode pop3_state_auth_digest_resp(struct connectdata *conn,
936 CURLcode result = CURLE_OK;
937 struct SessionHandle *data = conn->data;
938 char *chlg64 = data->state.buffer;
940 char *rplyb64 = NULL;
942 (void)instate; /* no use for this yet */
944 if(pop3code != '+') {
945 failf(data, "Access denied: %d", pop3code);
946 return CURLE_LOGIN_DENIED;
949 /* Get the challenge */
950 for(chlg64 += 2; *chlg64 == ' ' || *chlg64 == '\t'; chlg64++)
953 /* Create the response message */
954 result = Curl_sasl_create_digest_md5_message(data, chlg64, conn->user,
958 /* Send the response */
961 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", rplyb64);
964 state(conn, POP3_AUTH_DIGESTMD5_RESP);
967 Curl_safefree(rplyb64);
973 /* For AUTH DIGEST-MD5 challenge-response responses */
974 static CURLcode pop3_state_auth_digest_resp_resp(struct connectdata *conn,
978 CURLcode result = CURLE_OK;
979 struct SessionHandle *data = conn->data;
981 (void)instate; /* no use for this yet */
983 if(pop3code != '+') {
984 failf(data, "Authentication failed: %d", pop3code);
985 result = CURLE_LOGIN_DENIED;
988 /* Send an empty response */
989 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "");
992 state(conn, POP3_AUTH_FINAL);
1000 /* For AUTH NTLM responses */
1001 static CURLcode pop3_state_auth_ntlm_resp(struct connectdata *conn,
1005 CURLcode result = CURLE_OK;
1006 struct SessionHandle *data = conn->data;
1008 char *type1msg = NULL;
1010 (void)instate; /* no use for this yet */
1012 if(pop3code != '+') {
1013 failf(data, "Access denied: %d", pop3code);
1014 result = CURLE_LOGIN_DENIED;
1017 /* Create the type-1 message */
1018 result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd,
1022 /* Send the message */
1025 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", type1msg);
1028 state(conn, POP3_AUTH_NTLM_TYPE2MSG);
1031 Curl_safefree(type1msg);
1038 /* For NTLM type-2 responses (sent in reponse to our type-1 message) */
1039 static CURLcode pop3_state_auth_ntlm_type2msg_resp(struct connectdata *conn,
1043 CURLcode result = CURLE_OK;
1044 struct SessionHandle *data = conn->data;
1046 char *type3msg = NULL;
1048 (void)instate; /* no use for this yet */
1050 if(pop3code != '+') {
1051 failf(data, "Access denied: %d", pop3code);
1052 result = CURLE_LOGIN_DENIED;
1055 /* Create the type-3 message */
1056 result = Curl_sasl_create_ntlm_type3_message(data,
1057 data->state.buffer + 2,
1058 conn->user, conn->passwd,
1062 /* Send the message */
1065 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", type3msg);
1068 state(conn, POP3_AUTH_FINAL);
1071 Curl_safefree(type3msg);
1079 /* For final responses to the AUTH sequence */
1080 static CURLcode pop3_state_auth_final_resp(struct connectdata *conn,
1084 CURLcode result = CURLE_OK;
1085 struct SessionHandle *data = conn->data;
1087 (void)instate; /* no use for this yet */
1089 if(pop3code != '+') {
1090 failf(data, "Authentication failed: %d", pop3code);
1091 result = CURLE_LOGIN_DENIED;
1094 /* End of connect phase */
1095 state(conn, POP3_STOP);
1100 #ifndef CURL_DISABLE_CRYPTO_AUTH
1101 /* For APOP responses */
1102 static CURLcode pop3_state_apop_resp(struct connectdata *conn, int pop3code,
1105 CURLcode result = CURLE_OK;
1106 struct SessionHandle *data = conn->data;
1108 (void)instate; /* no use for this yet */
1110 if(pop3code != '+') {
1111 failf(data, "Authentication failed: %d", pop3code);
1112 result = CURLE_LOGIN_DENIED;
1115 /* End of connect phase */
1116 state(conn, POP3_STOP);
1122 /* For USER responses */
1123 static CURLcode pop3_state_user_resp(struct connectdata *conn, int pop3code,
1126 CURLcode result = CURLE_OK;
1127 struct SessionHandle *data = conn->data;
1129 (void)instate; /* no use for this yet */
1131 if(pop3code != '+') {
1132 failf(data, "Access denied. %c", pop3code);
1133 result = CURLE_LOGIN_DENIED;
1136 /* Send the PASS command */
1137 result = Curl_pp_sendf(&conn->proto.pop3c.pp, "PASS %s",
1138 conn->passwd ? conn->passwd : "");
1140 state(conn, POP3_PASS);
1145 /* For PASS responses */
1146 static CURLcode pop3_state_pass_resp(struct connectdata *conn, int pop3code,
1149 CURLcode result = CURLE_OK;
1150 struct SessionHandle *data = conn->data;
1152 (void)instate; /* no use for this yet */
1154 if(pop3code != '+') {
1155 failf(data, "Access denied. %c", pop3code);
1156 result = CURLE_LOGIN_DENIED;
1159 /* End of connect phase */
1160 state(conn, POP3_STOP);
1165 /* For command responses */
1166 static CURLcode pop3_state_command_resp(struct connectdata *conn,
1170 CURLcode result = CURLE_OK;
1171 struct SessionHandle *data = conn->data;
1172 struct POP3 *pop3 = data->state.proto.pop3;
1173 struct pop3_conn *pop3c = &conn->proto.pop3c;
1174 struct pingpong *pp = &pop3c->pp;
1176 (void)instate; /* no use for this yet */
1178 if(pop3code != '+') {
1179 state(conn, POP3_STOP);
1180 return CURLE_RECV_ERROR;
1183 /* This 'OK' line ends with a CR LF pair which is the two first bytes of the
1184 EOB string so count this is two matching bytes. This is necessary to make
1185 the code detect the EOB if the only data than comes now is %2e CR LF like
1186 when there is no body to return. */
1189 /* But since this initial CR LF pair is not part of the actual body, we set
1190 the strip counter here so that these bytes won't be delivered. */
1193 if(pop3->transfer == FTPTRANSFER_BODY) {
1195 Curl_setup_transfer(conn, FIRSTSOCKET, -1, FALSE, NULL, -1, NULL);
1198 /* The header "cache" contains a bunch of data that is actually body
1199 content so send it as such. Note that there may even be additional
1200 "headers" after the body */
1202 if(!data->set.opt_no_body) {
1203 result = Curl_pop3_write(conn, pp->cache, pp->cache_size);
1208 /* Free the cache */
1209 Curl_safefree(pp->cache);
1211 /* Reset the cache size */
1216 /* End of DO phase */
1217 state(conn, POP3_STOP);
1222 static CURLcode pop3_statemach_act(struct connectdata *conn)
1224 CURLcode result = CURLE_OK;
1225 curl_socket_t sock = conn->sock[FIRSTSOCKET];
1227 struct pop3_conn *pop3c = &conn->proto.pop3c;
1228 struct pingpong *pp = &pop3c->pp;
1231 /* Busy upgrading the connection; right now all I/O is SSL/TLS, not POP3 */
1232 if(pop3c->state == POP3_UPGRADETLS)
1233 return pop3_perform_upgrade_tls(conn);
1235 /* Flush any data that needs to be sent */
1237 return Curl_pp_flushsend(pp);
1239 /* Read the response from the server */
1240 result = Curl_pp_readresp(sock, pp, &pop3code, &nread);
1245 /* We have now received a full POP3 server response */
1246 switch(pop3c->state) {
1247 case POP3_SERVERGREET:
1248 result = pop3_state_servergreet_resp(conn, pop3code, pop3c->state);
1252 result = pop3_state_capa_resp(conn, pop3code, pop3c->state);
1256 result = pop3_state_starttls_resp(conn, pop3code, pop3c->state);
1259 case POP3_AUTH_PLAIN:
1260 result = pop3_state_auth_plain_resp(conn, pop3code, pop3c->state);
1263 case POP3_AUTH_LOGIN:
1264 result = pop3_state_auth_login_resp(conn, pop3code, pop3c->state);
1267 case POP3_AUTH_LOGIN_PASSWD:
1268 result = pop3_state_auth_login_password_resp(conn, pop3code,
1272 #ifndef CURL_DISABLE_CRYPTO_AUTH
1273 case POP3_AUTH_CRAMMD5:
1274 result = pop3_state_auth_cram_resp(conn, pop3code, pop3c->state);
1277 case POP3_AUTH_DIGESTMD5:
1278 result = pop3_state_auth_digest_resp(conn, pop3code, pop3c->state);
1281 case POP3_AUTH_DIGESTMD5_RESP:
1282 result = pop3_state_auth_digest_resp_resp(conn, pop3code, pop3c->state);
1287 case POP3_AUTH_NTLM:
1288 result = pop3_state_auth_ntlm_resp(conn, pop3code, pop3c->state);
1291 case POP3_AUTH_NTLM_TYPE2MSG:
1292 result = pop3_state_auth_ntlm_type2msg_resp(conn, pop3code,
1297 case POP3_AUTH_FINAL:
1298 result = pop3_state_auth_final_resp(conn, pop3code, pop3c->state);
1301 #ifndef CURL_DISABLE_CRYPTO_AUTH
1303 result = pop3_state_apop_resp(conn, pop3code, pop3c->state);
1308 result = pop3_state_user_resp(conn, pop3code, pop3c->state);
1312 result = pop3_state_pass_resp(conn, pop3code, pop3c->state);
1316 result = pop3_state_command_resp(conn, pop3code, pop3c->state);
1320 /* fallthrough, just stop! */
1322 /* internal error */
1323 state(conn, POP3_STOP);
1331 /* Called repeatedly until done from multi.c */
1332 static CURLcode pop3_multi_statemach(struct connectdata *conn, bool *done)
1334 CURLcode result = CURLE_OK;
1335 struct pop3_conn *pop3c = &conn->proto.pop3c;
1337 if((conn->handler->flags & PROTOPT_SSL) && !pop3c->ssldone)
1338 result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &pop3c->ssldone);
1340 result = Curl_pp_statemach(&pop3c->pp, FALSE);
1342 *done = (pop3c->state == POP3_STOP) ? TRUE : FALSE;
1347 static CURLcode pop3_block_statemach(struct connectdata *conn)
1349 CURLcode result = CURLE_OK;
1350 struct pop3_conn *pop3c = &conn->proto.pop3c;
1352 while(pop3c->state != POP3_STOP && !result)
1353 result = Curl_pp_statemach(&pop3c->pp, TRUE);
1358 /* Allocate and initialize the POP3 struct for the current SessionHandle if
1360 static CURLcode pop3_init(struct connectdata *conn)
1362 CURLcode result = CURLE_OK;
1363 struct SessionHandle *data = conn->data;
1364 struct POP3 *pop3 = data->state.proto.pop3;
1367 pop3 = data->state.proto.pop3 = calloc(sizeof(struct POP3), 1);
1369 result = CURLE_OUT_OF_MEMORY;
1375 /* For the POP3 "protocol connect" and "doing" phases only */
1376 static int pop3_getsock(struct connectdata *conn, curl_socket_t *socks,
1379 return Curl_pp_getsock(&conn->proto.pop3c.pp, socks, numsocks);
1382 /***********************************************************************
1386 * This function should do everything that is to be considered a part of the
1389 * The variable 'done' points to will be TRUE if the protocol-layer connect
1390 * phase is done when this function returns, or FALSE is not. When called as
1391 * a part of the easy interface, it will always be TRUE.
1393 static CURLcode pop3_connect(struct connectdata *conn, bool *done)
1395 CURLcode result = CURLE_OK;
1396 struct pop3_conn *pop3c = &conn->proto.pop3c;
1397 struct pingpong *pp = &pop3c->pp;
1399 *done = FALSE; /* default to not done yet */
1401 /* If there already is a protocol-specific struct allocated for this
1402 sessionhandle, deal with it */
1403 Curl_reset_reqproto(conn);
1405 /* Initialise the POP3 layer */
1406 result = pop3_init(conn);
1410 /* We always support persistent connections in POP3 */
1411 conn->bits.close = FALSE;
1413 /* Set the default response time-out */
1414 pp->response_time = RESP_TIMEOUT;
1415 pp->statemach_act = pop3_statemach_act;
1416 pp->endofresp = pop3_endofresp;
1419 /* Set the default preferred authentication type and mechanism */
1420 pop3c->preftype = POP3_TYPE_ANY;
1421 pop3c->prefmech = SASL_AUTH_ANY;
1423 /* Initialise the pingpong layer */
1426 /* Parse the URL options */
1427 result = pop3_parse_url_options(conn);
1431 /* Start off waiting for the server greeting response */
1432 state(conn, POP3_SERVERGREET);
1434 result = pop3_multi_statemach(conn, done);
1439 /***********************************************************************
1443 * The DONE function. This does what needs to be done after a single DO has
1446 * Input argument is already checked for validity.
1448 static CURLcode pop3_done(struct connectdata *conn, CURLcode status,
1451 CURLcode result = CURLE_OK;
1452 struct SessionHandle *data = conn->data;
1453 struct POP3 *pop3 = data->state.proto.pop3;
1458 /* When the easy handle is removed from the multi interface while libcurl
1459 is still trying to resolve the host name, the POP3 struct is not yet
1460 initialized. However, the removal action calls Curl_done() which in
1461 turn calls this function, so we simply return success. */
1465 conn->bits.close = TRUE; /* marked for closure */
1466 result = status; /* use the already set error code */
1469 /* Cleanup our per-request based variables */
1470 Curl_safefree(pop3->id);
1471 Curl_safefree(pop3->custom);
1473 /* Clear the transfer mode for the next request */
1474 pop3->transfer = FTPTRANSFER_BODY;
1479 /***********************************************************************
1483 * This is the actual DO function for POP3. Get a message/listing according to
1484 * the options previously setup.
1486 static CURLcode pop3_perform(struct connectdata *conn, bool *connected,
1489 /* This is POP3 and no proxy */
1490 CURLcode result = CURLE_OK;
1492 DEBUGF(infof(conn->data, "DO phase starts\n"));
1494 if(conn->data->set.opt_no_body) {
1495 /* Requested no body means no transfer */
1496 struct POP3 *pop3 = conn->data->state.proto.pop3;
1497 pop3->transfer = FTPTRANSFER_INFO;
1500 *dophase_done = FALSE; /* not done yet */
1502 /* Start the first command in the DO phase */
1503 result = pop3_perform_command(conn);
1507 /* Run the state-machine */
1508 result = pop3_multi_statemach(conn, dophase_done);
1510 *connected = conn->bits.tcpconnect[FIRSTSOCKET];
1513 DEBUGF(infof(conn->data, "DO phase is complete\n"));
1518 /***********************************************************************
1522 * This function is registered as 'curl_do' function. It decodes the path
1523 * parts etc as a wrapper to the actual DO function (pop3_perform).
1525 * The input argument is already checked for validity.
1527 static CURLcode pop3_do(struct connectdata *conn, bool *done)
1529 CURLcode result = CURLE_OK;
1531 *done = FALSE; /* default to false */
1533 /* Since connections can be re-used between SessionHandles, there might be a
1534 connection already existing but on a fresh SessionHandle struct. As such
1535 we make sure we have a good POP3 struct to play with. For new connections
1536 the POP3 struct is allocated and setup in the pop3_connect() function. */
1537 Curl_reset_reqproto(conn);
1538 result = pop3_init(conn);
1542 /* Parse the URL path */
1543 result = pop3_parse_url_path(conn);
1547 /* Parse the custom request */
1548 result = pop3_parse_custom_request(conn);
1552 result = pop3_regular_transfer(conn, done);
1557 /***********************************************************************
1561 * Disconnect from an POP3 server. Cleanup protocol-specific per-connection
1562 * resources. BLOCKING.
1564 static CURLcode pop3_disconnect(struct connectdata *conn,
1565 bool dead_connection)
1567 struct pop3_conn *pop3c = &conn->proto.pop3c;
1569 /* We cannot send quit unconditionally. If this connection is stale or
1570 bad in any way, sending quit and waiting around here will make the
1571 disconnect wait in vain and cause more problems than we need to. */
1573 /* The POP3 session may or may not have been allocated/setup at this
1575 if(!dead_connection && pop3c->pp.conn)
1576 if(!pop3_perform_quit(conn))
1577 (void)pop3_block_statemach(conn); /* ignore errors on QUIT */
1579 /* Disconnect from the server */
1580 Curl_pp_disconnect(&pop3c->pp);
1582 /* Cleanup the SASL module */
1583 Curl_sasl_cleanup(conn, pop3c->authused);
1585 /* Cleanup our connection based variables */
1586 Curl_safefree(pop3c->apoptimestamp);
1591 /* Call this when the DO phase has completed */
1592 static CURLcode pop3_dophase_done(struct connectdata *conn, bool connected)
1600 /* Called from multi.c while DOing */
1601 static CURLcode pop3_doing(struct connectdata *conn, bool *dophase_done)
1603 CURLcode result = pop3_multi_statemach(conn, dophase_done);
1606 DEBUGF(infof(conn->data, "DO phase failed\n"));
1607 else if(*dophase_done) {
1608 result = pop3_dophase_done(conn, FALSE /* not connected */);
1610 DEBUGF(infof(conn->data, "DO phase is complete\n"));
1616 /***********************************************************************
1618 * pop3_regular_transfer()
1620 * The input argument is already checked for validity.
1622 * Performs all commands done before a regular transfer between a local and a
1625 static CURLcode pop3_regular_transfer(struct connectdata *conn,
1628 CURLcode result = CURLE_OK;
1629 bool connected = FALSE;
1630 struct SessionHandle *data = conn->data;
1632 /* Make sure size is unknown at this point */
1633 data->req.size = -1;
1635 /* Set the progress data */
1636 Curl_pgrsSetUploadCounter(data, 0);
1637 Curl_pgrsSetDownloadCounter(data, 0);
1638 Curl_pgrsSetUploadSize(data, 0);
1639 Curl_pgrsSetDownloadSize(data, 0);
1641 /* Carry out the perform */
1642 result = pop3_perform(conn, &connected, dophase_done);
1644 /* Perform post DO phase operations if necessary */
1645 if(!result && *dophase_done)
1646 result = pop3_dophase_done(conn, connected);
1651 static CURLcode pop3_setup_connection(struct connectdata *conn)
1653 struct SessionHandle *data = conn->data;
1655 if(conn->bits.httpproxy && !data->set.tunnel_thru_httpproxy) {
1656 /* Unless we have asked to tunnel POP3 operations through the proxy, we
1657 switch and use HTTP operations only */
1658 #ifndef CURL_DISABLE_HTTP
1659 if(conn->handler == &Curl_handler_pop3)
1660 conn->handler = &Curl_handler_pop3_proxy;
1663 conn->handler = &Curl_handler_pop3s_proxy;
1665 failf(data, "POP3S not supported!");
1666 return CURLE_UNSUPPORTED_PROTOCOL;
1670 /* We explicitly mark this connection as persistent here as we're doing
1671 POP3 over HTTP and thus we accidentally avoid setting this value
1673 conn->bits.close = FALSE;
1675 failf(data, "POP3 over http proxy requires HTTP support built-in!");
1676 return CURLE_UNSUPPORTED_PROTOCOL;
1680 data->state.path++; /* don't include the initial slash */
1685 /***********************************************************************
1687 * pop3_parse_url_options()
1689 * Parse the URL login options.
1691 static CURLcode pop3_parse_url_options(struct connectdata *conn)
1693 CURLcode result = CURLE_OK;
1694 struct pop3_conn *pop3c = &conn->proto.pop3c;
1695 const char *options = conn->options;
1696 const char *ptr = options;
1699 const char *key = ptr;
1701 while(*ptr && *ptr != '=')
1704 if(strnequal(key, "AUTH", 4)) {
1705 const char *value = ptr + 1;
1707 if(strequal(value, "*")) {
1708 pop3c->preftype = POP3_TYPE_ANY;
1709 pop3c->prefmech = SASL_AUTH_ANY;
1711 else if(strequal(value, "+APOP")) {
1712 pop3c->preftype = POP3_TYPE_APOP;
1713 pop3c->prefmech = SASL_AUTH_NONE;
1715 else if(strequal(value, "LOGIN")) {
1716 pop3c->preftype = POP3_TYPE_SASL;
1717 pop3c->prefmech = SASL_MECH_LOGIN;
1719 else if(strequal(value, "PLAIN")) {
1720 pop3c->preftype = POP3_TYPE_SASL;
1721 pop3c->prefmech = SASL_MECH_PLAIN;
1723 else if(strequal(value, "CRAM-MD5")) {
1724 pop3c->preftype = POP3_TYPE_SASL;
1725 pop3c->prefmech = SASL_MECH_CRAM_MD5;
1727 else if(strequal(value, "DIGEST-MD5")) {
1728 pop3c->preftype = POP3_TYPE_SASL;
1729 pop3c->prefmech = SASL_MECH_DIGEST_MD5;
1731 else if(strequal(value, "GSSAPI")) {
1732 pop3c->preftype = POP3_TYPE_SASL;
1733 pop3c->prefmech = SASL_MECH_GSSAPI;
1735 else if(strequal(value, "NTLM")) {
1736 pop3c->preftype = POP3_TYPE_SASL;
1737 pop3c->prefmech = SASL_MECH_NTLM;
1740 pop3c->preftype = POP3_TYPE_NONE;
1741 pop3c->prefmech = SASL_AUTH_NONE;
1745 result = CURLE_URL_MALFORMAT;
1751 /***********************************************************************
1753 * pop3_parse_url_path()
1755 * Parse the URL path into separate path components.
1757 static CURLcode pop3_parse_url_path(struct connectdata *conn)
1759 /* The POP3 struct is already initialised in pop3_connect() */
1760 struct SessionHandle *data = conn->data;
1761 struct POP3 *pop3 = data->state.proto.pop3;
1762 const char *path = data->state.path;
1764 /* URL decode the path for the message ID */
1765 return Curl_urldecode(data, path, 0, &pop3->id, NULL, TRUE);
1768 /***********************************************************************
1770 * pop3_parse_custom_request()
1772 * Parse the custom request.
1774 static CURLcode pop3_parse_custom_request(struct connectdata *conn)
1776 CURLcode result = CURLE_OK;
1777 struct SessionHandle *data = conn->data;
1778 struct POP3 *pop3 = data->state.proto.pop3;
1779 const char *custom = data->set.str[STRING_CUSTOMREQUEST];
1781 /* URL decode the custom request */
1783 result = Curl_urldecode(data, custom, 0, &pop3->custom, NULL, TRUE);
1788 /***********************************************************************
1792 * This function scans the body after the end-of-body and writes everything
1793 * until the end is found.
1795 CURLcode Curl_pop3_write(struct connectdata *conn, char *str, size_t nread)
1797 /* This code could be made into a special function in the handler struct */
1798 CURLcode result = CURLE_OK;
1799 struct SessionHandle *data = conn->data;
1800 struct SingleRequest *k = &data->req;
1802 struct pop3_conn *pop3c = &conn->proto.pop3c;
1803 bool strip_dot = FALSE;
1807 /* Search through the buffer looking for the end-of-body marker which is
1808 5 bytes (0d 0a 2e 0d 0a). Note that a line starting with a dot matches
1809 the eob so the server will have prefixed it with an extra dot which we
1810 need to strip out. Additionally the marker could of course be spread out
1811 over 5 different data chunks. */
1812 for(i = 0; i < nread; i++) {
1813 size_t prev = pop3c->eob;
1817 if(pop3c->eob == 0) {
1821 /* Write out the body part that didn't match */
1822 result = Curl_client_write(conn, CLIENTWRITE_BODY, &str[last],
1831 else if(pop3c->eob == 3)
1834 /* If the character match wasn't at position 0 or 3 then restart the
1840 if(pop3c->eob == 1 || pop3c->eob == 4)
1843 /* If the character match wasn't at position 1 or 4 then start the
1851 else if(pop3c->eob == 3) {
1852 /* We have an extra dot after the CRLF which we need to strip off */
1857 /* If the character match wasn't at position 2 then start the search
1867 /* Did we have a partial match which has subsequently failed? */
1868 if(prev && prev >= pop3c->eob) {
1869 /* Strip can only be non-zero for the very first mismatch after CRLF
1870 and then both prev and strip are equal and nothing will be output
1872 while(prev && pop3c->strip) {
1878 /* If the partial match was the CRLF and dot then only write the CRLF
1879 as the server would have inserted the dot */
1880 result = Curl_client_write(conn, CLIENTWRITE_BODY, (char*)POP3_EOB,
1881 strip_dot ? prev - 1 : prev);
1892 if(pop3c->eob == POP3_EOB_LEN) {
1893 /* We have a full match so the transfer is done, however we must transfer
1894 the CRLF at the start of the EOB as this is considered to be part of the
1895 message as per RFC-1939, sect. 3 */
1896 result = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)POP3_EOB, 2);
1898 k->keepon &= ~KEEP_RECV;
1905 /* While EOB is matching nothing should be output */
1909 result = Curl_client_write(conn, CLIENTWRITE_BODY, &str[last],
1916 #endif /* CURL_DISABLE_POP3 */