2 * smtp.c -- nmh SMTP interface
4 * This code is Copyright (c) 2002, by the authors of nmh. See the
5 * COPYRIGHT file in the root directory of the nmh distribution for
6 * complete copyright information.
13 #include <h/signals.h>
16 #include <sasl/sasl.h>
17 #include <sasl/saslutil.h>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
23 #endif /* CYRUS_SASL */
26 #include <openssl/ssl.h>
27 #include <openssl/err.h>
28 #endif /* TLS_SUPPORT */
31 * This module implements an interface to SendMail very similar
32 * to the MMDF mm_(3) routines. The sm_() routines herein talk
33 * SMTP to a sendmail process, mapping SMTP reply codes into
38 * On older 4.2BSD machines without the POSIX function `sigaction',
39 * the alarm handing stuff for time-outs will NOT work due to the way
40 * syscalls get restarted. This is not really crucial, since SendMail
41 * is generally well-behaved in this area.
46 * It appears that some versions of Sendmail will return Code 451
47 * when they don't really want to indicate a failure.
48 * "Code 451 almost always means sendmail has deferred; we don't
49 * really want bomb out at this point since sendmail will rectify
50 * things later." So, if you define SENDMAILBUG, Code 451 is
51 * considered the same as Code 250. Yuck!
58 #define NBITS ((sizeof (int)) * 8)
61 * these codes must all be different!
63 #define SM_OPEN 300 /* Changed to 5 minutes to comply with a SHOULD in RFC 1123 */
66 #define SM_MAIL 301 /* changed to 5 minutes and a second (for uniqueness), see above */
67 #define SM_RCPT 302 /* see above */
68 #define SM_DATA 120 /* see above */
69 #define SM_TEXT 180 /* see above */
70 #define SM_DOT 600 /* see above */
75 #endif /* CYRUS_SASL */
77 static int sm_addrs = 0;
78 static int sm_alarmed = 0;
79 static int sm_child = NOTOK;
80 static int sm_debug = 0;
81 static int sm_nl = TRUE;
82 static int sm_verbose = 0;
84 static FILE *sm_rfp = NULL;
85 static FILE *sm_wfp = NULL;
89 * Some globals needed by SASL
92 static sasl_conn_t *conn = NULL; /* SASL connection state */
93 static int sasl_complete = 0; /* Has authentication succeded? */
94 static sasl_ssf_t sasl_ssf; /* Our security strength factor */
95 static char *sasl_pw_context[2]; /* Context to pass into sm_get_pass */
96 static int maxoutbuf; /* Maximum crypto output buffer */
97 static char *sasl_outbuffer; /* SASL output buffer for encryption */
98 static int sasl_outbuflen; /* Current length of data in outbuf */
99 static int sm_get_user(void *, int, const char **, unsigned *);
100 static int sm_get_pass(sasl_conn_t *, void *, int, sasl_secret_t **);
102 static sasl_callback_t callbacks[] = {
103 { SASL_CB_USER, sm_get_user, NULL },
104 #define SM_SASL_N_CB_USER 0
105 { SASL_CB_PASS, sm_get_pass, NULL },
106 #define SM_SASL_N_CB_PASS 1
107 { SASL_CB_AUTHNAME, sm_get_user, NULL },
108 #define SM_SASL_N_CB_AUTHNAME 2
109 { SASL_CB_LIST_END, NULL, NULL },
112 #else /* CYRUS_SASL */
114 #endif /* CYRUS_SASL */
117 static SSL_CTX *sslctx = NULL;
118 static SSL *ssl = NULL;
119 static BIO *sbior = NULL;
120 static BIO *sbiow = NULL;
121 static BIO *io = NULL;
122 #endif /* TLS_SUPPORT */
124 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
125 #define SASL_MAXRECVBUF 65536
126 static int sm_fgetc(FILE *);
127 static char *sasl_inbuffer; /* SASL input buffer for encryption */
128 static char *sasl_inptr; /* Pointer to current inbuf position */
129 static int sasl_inbuflen; /* Current length of data in inbuf */
131 #define sm_fgetc fgetc
134 static int tls_active = 0;
136 static char *sm_noreply = "No reply text given";
137 static char *sm_moreply = "; ";
139 struct smtp sm_reply; /* global... */
143 static int doingEHLO;
144 char *EHLOkeys[MAXEHLO + 1];
149 static int smtp_init (char *, char *, char *, int, int, int, int, int, int,
150 char *, char *, int);
151 static int sendmail_init (char *, char *, int, int, int, int, int, int,
154 static int rclient (char *, char *);
155 static int sm_ierror (char *fmt, ...);
156 static int smtalk (int time, char *fmt, ...);
157 static int sm_wrecord (char *, int);
158 static int sm_wstream (char *, int);
159 static int sm_werror (void);
160 static int smhear (void);
161 static int sm_rrecord (char *, int *);
162 static int sm_rerror (int);
163 static void alrmser (int);
164 static char *EHLOset (char *);
165 static int sm_fwrite(char *, int);
166 static int sm_fputs(char *);
167 static int sm_fputc(int);
168 static void sm_fflush(void);
169 static int sm_fgets(char *, int, FILE *);
173 * Function prototypes needed for SASL
176 static int sm_auth_sasl(char *, int, char *, char *);
177 #endif /* CYRUS_SASL */
180 sm_init (char *client, char *server, char *port, int watch, int verbose,
181 int debug, int queued, int sasl, int saslssf,
182 char *saslmech, char *user, int tls)
184 if (sm_mts == MTS_SMTP)
185 return smtp_init (client, server, port, watch, verbose,
186 debug, queued, sasl, saslssf, saslmech,
189 return sendmail_init (client, server, watch, verbose,
190 debug, queued, sasl, saslssf, saslmech,
195 smtp_init (char *client, char *server, char *port, int watch, int verbose,
196 int debug, int queued,
197 int sasl, int saslssf, char *saslmech, char *user, int tls)
199 int result, sd1, sd2;
202 #else /* CYRUS_SASL */
204 NMH_UNUSED (saslssf);
205 NMH_UNUSED (saslmech);
207 #endif /* CYRUS_SASL */
212 sm_verbose = verbose;
215 if (sm_rfp != NULL && sm_wfp != NULL)
218 if (client == NULL || *client == '\0') {
222 client = LocalName(1); /* no clientname -> LocalName */
227 * Last-ditch check just in case client still isn't set to anything
230 if (client == NULL || *client == '\0')
231 client = "localhost";
233 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
234 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
236 return sm_ierror("Unable to allocate %d bytes for read buffer",
238 #endif /* CYRUS_SASL || TLS_SUPPORT */
240 if ((sd1 = rclient (server, port)) == NOTOK)
243 if ((sd2 = dup (sd1)) == NOTOK) {
245 return sm_ierror ("unable to dup");
248 SIGNAL (SIGALRM, alrmser);
249 SIGNAL (SIGPIPE, SIG_IGN);
251 if ((sm_rfp = fdopen (sd1, "r")) == NULL
252 || (sm_wfp = fdopen (sd2, "w")) == NULL) {
255 sm_rfp = sm_wfp = NULL;
256 return sm_ierror ("unable to fdopen");
276 * Give EHLO or HELO command
280 result = smtalk (SM_HELO, "EHLO %s", client);
283 if (result >= 500 && result <= 599)
284 result = smtalk (SM_HELO, "HELO %s", client);
293 * If the user requested TLS support, then try to do the STARTTLS command
294 * as part of the initial dialog. Assuming this works, we then need to
295 * restart the EHLO dialog after TLS negotiation is complete.
301 if (! EHLOset("STARTTLS")) {
303 return sm_ierror("SMTP server does not support TLS");
306 result = smtalk(SM_HELO, "STARTTLS");
314 * Okay, the other side should be waiting for us to start TLS
315 * negotiation. Oblige them.
319 const SSL_METHOD *method;
322 SSL_load_error_strings();
324 method = TLSv1_client_method(); /* Not sure about this */
326 sslctx = SSL_CTX_new(method);
330 return sm_ierror("Unable to initialize OpenSSL context: %s",
331 ERR_error_string(ERR_get_error(), NULL));
335 ssl = SSL_new(sslctx);
339 return sm_ierror("Unable to create SSL connection: %s",
340 ERR_error_string(ERR_get_error(), NULL));
343 sbior = BIO_new_socket(fileno(sm_rfp), BIO_NOCLOSE);
344 sbiow = BIO_new_socket(fileno(sm_wfp), BIO_NOCLOSE);
346 if (sbior == NULL || sbiow == NULL) {
348 return sm_ierror("Unable to create BIO endpoints: %s",
349 ERR_error_string(ERR_get_error(), NULL));
352 SSL_set_bio(ssl, sbior, sbiow);
353 SSL_set_connect_state(ssl);
356 * Set up a BIO to handle buffering for us
359 io = BIO_new(BIO_f_buffer());
363 return sm_ierror("Unable to create a buffer BIO: %s",
364 ERR_error_string(ERR_get_error(), NULL));
367 ssl_bio = BIO_new(BIO_f_ssl());
371 return sm_ierror("Unable to create a SSL BIO: %s",
372 ERR_error_string(ERR_get_error(), NULL));
375 BIO_set_ssl(ssl_bio, ssl, BIO_CLOSE);
376 BIO_push(io, ssl_bio);
379 * Try doing the handshake now
382 if (BIO_do_handshake(io) < 1) {
384 return sm_ierror("Unable to negotiate SSL connection: %s",
385 ERR_error_string(ERR_get_error(), NULL));
389 const SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
390 printf("SSL negotiation successful: %s(%d) %s\n",
391 SSL_CIPHER_get_name(cipher),
392 SSL_CIPHER_get_bits(cipher, NULL),
393 SSL_CIPHER_get_version(cipher));
400 result = smtalk (SM_HELO, "EHLO %s", client);
408 #else /* TLS_SUPPORT */
410 #endif /* TLS_SUPPORT */
414 * If the user asked for SASL, then check to see if the SMTP server
415 * supports it. Otherwise, error out (because the SMTP server
416 * might have been spoofed; we don't want to just silently not
421 if (! (server_mechs = EHLOset("AUTH"))) {
423 return sm_ierror("SMTP server does not support SASL");
426 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
428 return sm_ierror("Requested SASL mech \"%s\" is not in the "
429 "list of supported mechanisms:\n%s",
430 saslmech, server_mechs);
433 if (sm_auth_sasl(user, saslssf, saslmech ? saslmech : server_mechs,
439 #endif /* CYRUS_SASL */
442 if (watch && EHLOset ("XVRB"))
443 smtalk (SM_HELO, "VERB on");
444 if (queued && EHLOset ("XQUE"))
445 smtalk (SM_HELO, "QUED");
451 sendmail_init (char *client, char *server, int watch, int verbose,
452 int debug, int queued,
453 int sasl, int saslssf, char *saslmech, char *user)
455 unsigned int i, result, vecp;
460 #else /* CYRUS_SASL */
463 NMH_UNUSED (saslssf);
464 NMH_UNUSED (saslmech);
466 #endif /* CYRUS_SASL */
471 sm_verbose = verbose;
473 if (sm_rfp != NULL && sm_wfp != NULL)
476 if (client == NULL || *client == '\0') {
480 client = LocalName(1); /* no clientname -> LocalName */
484 * Last-ditch check just in case client still isn't set to anything
487 if (client == NULL || *client == '\0')
488 client = "localhost";
490 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
491 sasl_inbuffer = malloc(SASL_MAXRECVBUF);
493 return sm_ierror("Unable to allocate %d bytes for read buffer",
495 #endif /* CYRUS_SASL || TLS_SUPPORT */
497 if (pipe (pdi) == NOTOK)
498 return sm_ierror ("no pipes");
499 if (pipe (pdo) == NOTOK) {
502 return sm_ierror ("no pipes");
505 for (i = 0; (sm_child = fork ()) == NOTOK && i < 5; i++)
514 return sm_ierror ("unable to fork");
517 if (pdo[0] != fileno (stdin))
518 dup2 (pdo[0], fileno (stdin));
519 if (pdi[1] != fileno (stdout))
520 dup2 (pdi[1], fileno (stdout));
521 if (pdi[1] != fileno (stderr))
522 dup2 (pdi[1], fileno (stderr));
523 for (i = fileno (stderr) + 1; i < NBITS; i++)
527 vec[vecp++] = r1bindex (sendmail, '/');
529 vec[vecp++] = watch ? "-odi" : queued ? "-odq" : "-odb";
530 vec[vecp++] = "-oem";
538 execvp (sendmail, vec);
539 fprintf (stderr, "unable to exec ");
541 _exit (-1); /* NOTREACHED */
544 SIGNAL (SIGALRM, alrmser);
545 SIGNAL (SIGPIPE, SIG_IGN);
549 if ((sm_rfp = fdopen (pdi[0], "r")) == NULL
550 || (sm_wfp = fdopen (pdo[1], "w")) == NULL) {
553 sm_rfp = sm_wfp = NULL;
554 return sm_ierror ("unable to fdopen");
570 result = smtalk (SM_HELO, "EHLO %s", client);
573 if (500 <= result && result <= 599)
574 result = smtalk (SM_HELO, "HELO %s", client);
587 * If the user asked for SASL, then check to see if the SMTP server
588 * supports it. Otherwise, error out (because the SMTP server
589 * might have been spoofed; we don't want to just silently not
594 if (! (server_mechs = EHLOset("AUTH"))) {
596 return sm_ierror("SMTP server does not support SASL");
599 if (saslmech && stringdex(saslmech, server_mechs) == -1) {
601 return sm_ierror("Requested SASL mech \"%s\" is not in the "
602 "list of supported mechanisms:\n%s",
603 saslmech, server_mechs);
606 if (sm_auth_sasl(user, saslssf, saslmech ? saslmech : server_mechs,
612 #endif /* CYRUS_SASL */
615 smtalk (SM_HELO, "VERB on");
622 rclient (char *server, char *service)
625 char response[BUFSIZ];
627 if ((sd = client (server, service, response, sizeof(response),
631 sm_ierror ("%s", response);
636 sm_winit (char *from)
638 switch (smtalk (SM_MAIL, "MAIL FROM:<%s>", from)) {
655 sm_wadr (char *mbox, char *host, char *path)
657 switch (smtalk (SM_RCPT, host && *host ? "RCPT TO:<%s%s@%s>"
659 path ? path : "", mbox, host)) {
669 #endif /* SENDMAILBUG */
694 switch (smtalk (SM_DATA, "DATA")) {
703 #endif /* SENDMAILBUG */
720 sm_wtxt (char *buffer, int len)
726 result = sm_wstream (buffer, len);
729 return (result == NOTOK ? RP_BHST : RP_OK);
736 if (sm_wstream ((char *) NULL, 0) == NOTOK)
739 switch (smtalk (SM_DOT + 3 * sm_addrs, ".")) {
747 #endif /* SENDMAILBUG */
765 if (sm_mts == MTS_SENDMAIL_SMTP) {
776 if (sm_rfp == NULL && sm_wfp == NULL)
781 smtalk (SM_QUIT, "QUIT");
785 sm_note.code = sm_reply.code;
786 sm_note.length = sm_reply.length;
787 memcpy (sm_note.text, sm_reply.text, sm_reply.length + 1);/* fall */
789 if (smtalk (SM_RSET, "RSET") == 250 && type == DONE)
791 if (sm_mts == MTS_SMTP)
792 smtalk (SM_QUIT, "QUIT");
794 kill (sm_child, SIGKILL);
799 sm_reply.code = sm_note.code;
800 sm_reply.length = sm_note.length;
801 memcpy (sm_reply.text, sm_note.text, sm_note.length + 1);
808 BIO_ssl_shutdown(io);
811 #endif /* TLS_SUPPORT */
813 if (sm_rfp != NULL) {
818 if (sm_wfp != NULL) {
824 if (sm_mts == MTS_SMTP) {
829 if (sasl_outbuffer) {
830 free(sasl_outbuffer);
835 #endif /* CYRUS_SASL */
837 status = pidwait (sm_child, OK);
841 sm_rfp = sm_wfp = NULL;
842 return (status ? RP_BHST : RP_OK);
847 * This function implements SASL authentication for SMTP. If this function
848 * completes successfully, then authentication is successful and we've
849 * (optionally) negotiated a security layer.
852 sm_auth_sasl(char *user, int saslssf, char *mechlist, char *inhost)
855 unsigned int buflen, outlen;
856 char *buf, outbuf[BUFSIZ], host[NI_MAXHOST];
857 const char *chosen_mech;
858 sasl_security_properties_t secprops;
863 * Initialize the callback contexts
867 user = getusername();
869 callbacks[SM_SASL_N_CB_USER].context = user;
870 callbacks[SM_SASL_N_CB_AUTHNAME].context = user;
873 * This is a _bit_ of a hack ... but if the hostname wasn't supplied
874 * to us on the command line, then call getpeername and do a
875 * reverse-address lookup on the IP address to get the name.
878 memset(host, 0, sizeof(host));
881 struct sockaddr_storage sin;
882 socklen_t len = sizeof(sin);
885 if (getpeername(fileno(sm_wfp), (struct sockaddr *) &sin, &len) < 0) {
886 sm_ierror("getpeername on SMTP socket failed: %s",
891 result = getnameinfo((struct sockaddr *) &sin, len, host, sizeof(host),
892 NULL, 0, NI_NAMEREQD);
894 sm_ierror("Unable to look up name of connected host: %s",
895 gai_strerror(result));
899 strncpy(host, inhost, sizeof(host) - 1);
902 sasl_pw_context[0] = host;
903 sasl_pw_context[1] = user;
905 callbacks[SM_SASL_N_CB_PASS].context = sasl_pw_context;
907 result = sasl_client_init(callbacks);
909 if (result != SASL_OK) {
910 sm_ierror("SASL library initialization failed: %s",
911 sasl_errstring(result, NULL, NULL));
915 result = sasl_client_new("smtp", host, NULL, NULL, NULL, 0, &conn);
917 if (result != SASL_OK) {
918 sm_ierror("SASL client initialization failed: %s",
919 sasl_errstring(result, NULL, NULL));
924 * Initialize the security properties. But if TLS is active, then
925 * don't negotiate encryption here.
928 memset(&secprops, 0, sizeof(secprops));
929 secprops.maxbufsize = SASL_MAXRECVBUF;
931 tls_active ? 0 : (saslssf != -1 ? (unsigned int) saslssf : UINT_MAX);
933 result = sasl_setprop(conn, SASL_SEC_PROPS, &secprops);
935 if (result != SASL_OK) {
936 sm_ierror("SASL security property initialization failed: %s",
937 sasl_errstring(result, NULL, NULL));
942 * Start the actual protocol. Feed the mech list into the library
943 * and get out a possible initial challenge
946 result = sasl_client_start(conn, mechlist, NULL, (const char **) &buf,
947 &buflen, (const char **) &chosen_mech);
949 if (result != SASL_OK && result != SASL_CONTINUE) {
950 sm_ierror("SASL client start failed: %s", sasl_errdetail(conn));
955 * If we got an initial challenge, send it as part of the AUTH
956 * command; otherwise, just send a plain AUTH command.
960 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
961 if (status != SASL_OK) {
962 sm_ierror("SASL base64 encode failed: %s",
963 sasl_errstring(status, NULL, NULL));
967 status = smtalk(SM_AUTH, "AUTH %s %s", chosen_mech, outbuf);
969 status = smtalk(SM_AUTH, "AUTH %s", chosen_mech);
972 * Now we loop until we either fail, get a SASL_OK, or a 235
973 * response code. Receive the challenges and process them until
977 while (result == SASL_CONTINUE) {
980 * If we get a 235 response, that means authentication has
981 * succeeded and we need to break out of the loop (yes, even if
982 * we still get SASL_CONTINUE from sasl_client_step()).
984 * Otherwise, if we get a message that doesn't seem to be a
985 * valid response, then abort
990 else if (status < 300 || status > 399)
994 * Special case; a zero-length response from the SMTP server
995 * is returned as a single =. If we get that, then set buflen
996 * to be zero. Otherwise, just decode the response.
999 if (strcmp("=", sm_reply.text) == 0) {
1002 result = sasl_decode64(sm_reply.text, sm_reply.length,
1003 outbuf, sizeof(outbuf), &outlen);
1005 if (result != SASL_OK) {
1006 smtalk(SM_AUTH, "*");
1007 sm_ierror("SASL base64 decode failed: %s",
1008 sasl_errstring(result, NULL, NULL));
1013 result = sasl_client_step(conn, outbuf, outlen, NULL,
1014 (const char **) &buf, &buflen);
1016 if (result != SASL_OK && result != SASL_CONTINUE) {
1017 smtalk(SM_AUTH, "*");
1018 sm_ierror("SASL client negotiation failed: %s",
1019 sasl_errstring(result, NULL, NULL));
1023 status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
1025 if (status != SASL_OK) {
1026 smtalk(SM_AUTH, "*");
1027 sm_ierror("SASL base64 encode failed: %s",
1028 sasl_errstring(status, NULL, NULL));
1032 status = smtalk(SM_AUTH, outbuf);
1036 * Make sure that we got the correct response
1039 if (status < 200 || status > 299)
1043 * We _should_ have completed the authentication successfully.
1044 * Get a few properties from the authentication exchange.
1047 result = sasl_getprop(conn, SASL_MAXOUTBUF, (const void **) &outbufmax);
1049 if (result != SASL_OK) {
1050 sm_ierror("Cannot retrieve SASL negotiated output buffer size: %s",
1051 sasl_errstring(result, NULL, NULL));
1055 maxoutbuf = *outbufmax;
1057 result = sasl_getprop(conn, SASL_SSF, (const void **) &ssf);
1061 if (result != SASL_OK) {
1062 sm_ierror("Cannot retrieve SASL negotiated security strength "
1063 "factor: %s", sasl_errstring(result, NULL, NULL));
1068 sasl_outbuffer = malloc(maxoutbuf);
1070 if (sasl_outbuffer == NULL) {
1071 sm_ierror("Unable to allocate %d bytes for SASL output "
1072 "buffer", maxoutbuf);
1077 sasl_inptr = sasl_inbuffer;
1079 sasl_outbuffer = NULL;
1080 /* Don't NULL out sasl_inbuffer because it could be used in
1090 * Our callback functions to feed data to the SASL library
1094 sm_get_user(void *context, int id, const char **result, unsigned *len)
1096 char *user = (char *) context;
1098 if (! result || ((id != SASL_CB_USER) && (id != SASL_CB_AUTHNAME)))
1099 return SASL_BADPARAM;
1103 *len = strlen(user);
1109 sm_get_pass(sasl_conn_t *conn, void *context, int id,
1110 sasl_secret_t **psecret)
1112 char **pw_context = (char **) context;
1118 if (! psecret || id != SASL_CB_PASS)
1119 return SASL_BADPARAM;
1121 ruserpass(pw_context[0], &(pw_context[1]), &pass);
1125 *psecret = (sasl_secret_t *) malloc(sizeof(sasl_secret_t) + len);
1132 (*psecret)->len = len;
1133 strcpy((char *) (*psecret)->data, pass);
1138 #endif /* CYRUS_SASL */
1141 sm_ierror (char *fmt, ...)
1146 vsnprintf (sm_reply.text, sizeof(sm_reply.text), fmt, ap);
1149 sm_reply.length = strlen (sm_reply.text);
1150 sm_reply.code = NOTOK;
1156 smtalk (int time, char *fmt, ...)
1160 char buffer[BUFSIZ];
1163 vsnprintf (buffer, sizeof(buffer), fmt, ap);
1168 printf("(sasl-encrypted) ");
1170 printf("(tls-encrypted) ");
1171 printf ("=> %s\n", buffer);
1176 alarm ((unsigned) time);
1177 if ((result = sm_wrecord (buffer, strlen (buffer))) != NOTOK)
1186 * write the buffer to the open SMTP channel
1190 sm_wrecord (char *buffer, int len)
1193 return sm_werror ();
1195 sm_fwrite (buffer, len);
1199 return (ferror (sm_wfp) ? sm_werror () : OK);
1204 sm_wstream (char *buffer, int len)
1207 static char lc = '\0';
1210 return sm_werror ();
1212 if (buffer == NULL && len == 0) {
1216 return (ferror (sm_wfp) ? sm_werror () : OK);
1219 for (bp = buffer; len > 0; bp++, len--) {
1228 sm_fputc ('.');/* FALL THROUGH */
1233 if (ferror (sm_wfp))
1234 return sm_werror ();
1239 return (ferror (sm_wfp) ? sm_werror () : OK);
1243 * Write out to the network, but do buffering for SASL (if enabled)
1247 sm_fwrite(char *buffer, int len)
1251 unsigned int outputlen;
1253 if (sasl_complete == 0 || sasl_ssf == 0) {
1254 #endif /* CYRUS_SASL */
1259 ret = BIO_write(io, buffer, len);
1262 sm_ierror("TLS error during write: %s",
1263 ERR_error_string(ERR_get_error(), NULL));
1267 #endif /* TLS_SUPPORT */
1268 fwrite(buffer, sizeof(*buffer), len, sm_wfp);
1271 while (len >= maxoutbuf - sasl_outbuflen) {
1272 memcpy(sasl_outbuffer + sasl_outbuflen, buffer,
1273 maxoutbuf - sasl_outbuflen);
1274 len -= maxoutbuf - sasl_outbuflen;
1277 if (sasl_encode(conn, sasl_outbuffer, maxoutbuf,
1278 &output, &outputlen) != SASL_OK) {
1279 sm_ierror("Unable to SASL encode connection data: %s",
1280 sasl_errdetail(conn));
1284 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1288 memcpy(sasl_outbuffer + sasl_outbuflen, buffer, len);
1289 sasl_outbuflen += len;
1292 #endif /* CYRUS_SASL */
1293 return ferror(sm_wfp) ? NOTOK : RP_OK;
1297 * Convenience functions to replace occurences of fputs() and fputc()
1301 sm_fputs(char *buffer)
1303 return sm_fwrite(buffer, strlen(buffer));
1311 return sm_fwrite(&h, 1);
1315 * Flush out any pending data on the connection
1323 unsigned int outputlen;
1326 if (sasl_complete == 1 && sasl_ssf > 0 && sasl_outbuflen > 0) {
1327 result = sasl_encode(conn, sasl_outbuffer, sasl_outbuflen,
1328 &output, &outputlen);
1329 if (result != SASL_OK) {
1330 sm_ierror("Unable to SASL encode connection data: %s",
1331 sasl_errdetail(conn));
1335 fwrite(output, sizeof(*output), outputlen, sm_wfp);
1338 #endif /* CYRUS_SASL */
1342 (void) BIO_flush(io);
1344 #endif /* TLS_SUPPORT */
1353 strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no socket opened"
1354 : sm_alarmed ? "write to socket timed out"
1355 : "error writing to socket"));
1357 return (sm_reply.code = NOTOK);
1364 int i, code, cont, bc = 0, rc, more;
1367 char **ehlo = NULL, buffer[BUFSIZ];
1370 static int at_least_once = 0;
1372 if (at_least_once) {
1375 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1389 sm_reply.length = 0;
1390 sm_reply.text[0] = 0;
1392 rc = sizeof(sm_reply.text) - 1;
1394 for (more = FALSE; sm_rrecord ((char *) (bp = (unsigned char *) buffer),
1398 printf("(sasl-decrypted) ");
1400 printf("(tls-decrypted) ");
1401 printf ("<= %s\n", buffer);
1406 && strncmp (buffer, "250", sizeof("250") - 1) == 0
1407 && (buffer[3] == '-' || doingEHLO == 2)
1409 if (doingEHLO == 2) {
1410 if ((*ehlo = malloc ((size_t) (strlen (buffer + 4) + 1)))) {
1411 strcpy (*ehlo++, buffer + 4);
1413 if (ehlo >= EHLOkeys + MAXEHLO)
1423 for (; bc > 0 && (!isascii (*bp) || !isdigit (*bp)); bp++, bc--)
1427 code = atoi ((char *) bp);
1429 for (; bc > 0 && isspace (*bp); bp++, bc--)
1431 if (bc > 0 && *bp == '-') {
1434 for (; bc > 0 && isspace (*bp); bp++, bc--)
1439 if (code != sm_reply.code || cont)
1443 sm_reply.code = code;
1446 /* can never fail to 0-terminate because of size of buffer vs fixed string */
1447 strncpy (buffer, sm_noreply, sizeof(buffer));
1448 bp = (unsigned char *) buffer;
1449 bc = strlen (sm_noreply);
1453 if ((i = min (bc, rc)) > 0) {
1457 i = strlen(sm_moreply);
1458 if (more && rc > i + 1) {
1459 memcpy (rp, sm_moreply, i); /* safe because of check in if() */
1466 if (sm_reply.code < 100) {
1468 printf ("%s\n", sm_reply.text);
1474 sm_reply.length = rp - sm_reply.text;
1475 sm_reply.text[sm_reply.length] = 0;
1476 return sm_reply.code;
1483 sm_rrecord (char *buffer, int *len)
1488 return sm_rerror(0);
1490 buffer[*len = 0] = 0;
1492 if ((retval = sm_fgets (buffer, BUFSIZ, sm_rfp)) != RP_OK)
1493 return sm_rerror (retval);
1494 *len = strlen (buffer);
1495 /* *len should be >0 except on EOF, but check for safety's sake */
1497 return sm_rerror (RP_EOF);
1498 if (buffer[*len - 1] != '\n')
1499 while ((retval = sm_fgetc (sm_rfp)) != '\n' && retval != EOF &&
1503 if ((*len > 1) && (buffer[*len - 2] == '\r'))
1512 * Our version of fgets, which calls our private fgetc function
1516 sm_fgets(char *buffer, int size, FILE *f)
1530 } while (size > 1 && c != '\n');
1538 #if defined(CYRUS_SASL) || defined(TLS_SUPPORT)
1540 * Read from the network, but do SASL or TLS encryption
1546 char tmpbuf[BUFSIZ], *retbuf;
1547 unsigned int retbufsize = 0;
1551 * If we have leftover data, return it
1554 if (sasl_inbuflen) {
1556 return (int) *sasl_inptr++;
1560 * If not, read from the network until we have some data to return
1563 while (retbufsize == 0) {
1567 cc = SSL_read(ssl, tmpbuf, sizeof(tmpbuf));
1570 result = SSL_get_error(ssl, cc);
1572 if (result != SSL_ERROR_ZERO_RETURN) {
1573 sm_ierror("TLS peer aborted connection");
1580 sm_ierror("SSL_read failed: %s",
1581 ERR_error_string(ERR_get_error(), NULL));
1585 #endif /* TLS_SUPPORT */
1587 cc = read(fileno(f), tmpbuf, sizeof(tmpbuf));
1593 sm_ierror("Unable to read from network: %s", strerror(errno));
1598 * Don't call sasl_decode unless sasl is complete and we have
1599 * encryption working
1603 if (sasl_complete == 0 || sasl_ssf == 0) {
1607 result = sasl_decode(conn, tmpbuf, cc, (const char **) &retbuf,
1610 if (result != SASL_OK) {
1611 sm_ierror("Unable to decode SASL network data: %s",
1612 sasl_errdetail(conn));
1616 #else /* ! CYRUS_SASL */
1619 #endif /* CYRUS_SASL */
1622 if (retbufsize > SASL_MAXRECVBUF) {
1623 sm_ierror("Received data (%d bytes) is larger than the buffer "
1624 "size (%d bytes)", retbufsize, SASL_MAXRECVBUF);
1628 memcpy(sasl_inbuffer, retbuf, retbufsize);
1629 sasl_inptr = sasl_inbuffer + 1;
1630 sasl_inbuflen = retbufsize - 1;
1632 return (int) sasl_inbuffer[0];
1634 #endif /* CYRUS_SASL || TLS_SUPPORT */
1639 if (sm_mts == MTS_SMTP)
1641 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no socket opened"
1642 : sm_alarmed ? "read from socket timed out"
1643 : rc == RP_EOF ? "premature end-of-file on socket"
1644 : "error reading from socket"));
1647 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no pipe opened"
1648 : sm_alarmed ? "read from pipe timed out"
1649 : rc == RP_EOF ? "premature end-of-file on pipe"
1650 : "error reading from pipe"));
1652 return (sm_reply.code = NOTOK);
1661 #ifndef RELIABLE_SIGNALS
1662 SIGNAL (SIGALRM, alrmser);
1667 printf ("timed out...\n");
1674 rp_string (int code)
1677 static char buffer[BUFSIZ];
1679 switch (sm_reply.code != NOTOK ? code : NOTOK) {
1699 snprintf (buffer, sizeof(buffer), "[%s] %s", text, sm_reply.text);
1719 snprintf (buffer, sizeof(buffer), "[%s] %3d %s",
1720 text, sm_reply.code, sm_reply.text);
1732 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1734 if (strncmp (ep, s, len) == 0) {
1735 for (ep += len; *ep == ' '; ep++)