3 * smtp.c -- nmh SMTP interface
10 #include <zotnet/mts/mts.h>
17 * This module implements an interface to SendMail very similar
18 * to the MMDF mm_(3) routines. The sm_() routines herein talk
19 * SMTP to a sendmail process, mapping SMTP reply codes into
24 * On older 4.2BSD machines without the POSIX function `sigaction',
25 * the alarm handing stuff for time-outs will NOT work due to the way
26 * syscalls get restarted. This is not really crucial, since SendMail
27 * is generally well-behaved in this area.
32 * It appears that some versions of Sendmail will return Code 451
33 * when they don't really want to indicate a failure.
34 * "Code 451 almost always means sendmail has deferred; we don't
35 * really want bomb out at this point since sendmail will rectify
36 * things later." So, if you define SENDMAILBUG, Code 451 is
37 * considered the same as Code 250. Yuck!
45 * these codes must all be different!
47 #define SM_OPEN 90 /* Changed from 30 in case of nameserver flakiness */
58 static int sm_addrs = 0;
59 static int sm_alarmed = 0;
60 static int sm_debug = 0;
61 static int sm_nl = TRUE;
62 static int sm_verbose = 0;
64 static FILE *sm_rfp = NULL;
65 static FILE *sm_wfp = NULL;
68 static int sm_ispool = 0;
69 static char sm_tmpfil[BUFSIZ];
72 static char *sm_noreply = "No reply text given";
73 static char *sm_moreply = "; ";
75 struct smtp sm_reply; /* global... */
81 char *EHLOkeys[MAXEHLO + 1];
86 static int rclient (char *, char *, char *);
87 static int sm_ierror (char *fmt, ...);
88 static int smtalk (int time, char *fmt, ...);
89 static int sm_wrecord (char *, int);
90 static int sm_wstream (char *, int);
91 static int sm_werror (void);
92 static int smhear (void);
93 static int sm_rrecord (char *, int *);
94 static int sm_rerror (void);
95 static RETSIGTYPE alrmser (int);
96 static char *EHLOset (char *);
100 * smtp.c's own static copy of several nmh library subroutines
102 static char **smail_brkstring (char *, char *, char *);
103 static int smail_brkany (char, char *);
104 char **smail_copyip (char **, char **, int);
109 sm_init (char *client, char *server, int watch, int verbose,
110 int debug, int onex, int queued)
112 int result, sd1, sd2;
117 sm_verbose = verbose;
125 if (sm_rfp != NULL && sm_wfp != NULL)
128 if (client == NULL || *client == '\0')
132 client = LocalName(); /* no clientname -> LocalName */
135 if (client == NULL || *client == '\0')
136 client = "localhost";
139 if ((sd1 = rclient (server, "tcp", "smtp")) == NOTOK)
150 if ((sm_wfp = fdopen (sd1, "w")) == NULL) {
153 return sm_ierror ("unable to fdopen");
156 sm_reply.text[sm_reply.length = 0] = NULL;
157 return (sm_reply.code = RP_OK);
161 if ((sd2 = dup (sd1)) == NOTOK) {
163 return sm_ierror ("unable to dup");
166 SIGNAL (SIGALRM, alrmser);
167 SIGNAL (SIGPIPE, SIG_IGN);
169 if ((sm_rfp = fdopen (sd1, "r")) == NULL
170 || (sm_wfp = fdopen (sd2, "w")) == NULL) {
173 sm_rfp = sm_wfp = NULL;
174 return sm_ierror ("unable to fdopen");
192 * Give EHLO or HELO command
194 if (client && *client) {
196 result = smtalk (SM_HELO, "EHLO %s", client);
199 if (result >= 500 && result <= 599)
200 result = smtalk (SM_HELO, "HELO %s", client);
209 if (watch && EHLOset ("XVRB"))
210 smtalk (SM_HELO, "VERB on");
211 if (onex && EHLOset ("XONE"))
212 smtalk (SM_HELO, "ONEX");
213 if (queued && EHLOset ("XQUE"))
214 smtalk (SM_HELO, "QUED");
221 # define MAXARGS 1000
225 rclient (char *server, char *protocol, char *service)
228 char response[BUFSIZ];
233 if ((sd = client (server, protocol, service, FALSE, response, sizeof(response))) != NOTOK)
237 if (!server && servers && (cp = strchr(servers, '/'))) {
239 char *arguments[MAXARGS];
241 smail_copyip (smail_brkstring (cp = getcpy (servers), " ", "\n"), arguments, MAXARGS);
243 for (ap = arguments; *ap; ap++)
247 if ((dp = strrchr(*ap, '/')) && *++dp == NULL)
249 snprintf (sm_tmpfil, sizeof(sm_tmpfil), "%s/smtpXXXXXX", *ap);
252 if ((sd = creat (sm_tmpfil, 0600)) != NOTOK) {
264 sm_ierror ("%s", response);
270 sm_winit (int mode, char *from)
275 if (sm_ispool && !sm_wfp) {
276 strlen (strcpy (sm_reply.text, "unable to create new spool file"));
277 sm_reply.code = NOTOK;
300 switch (smtalk (SM_MAIL, "%s FROM:<%s>", smtpcom, from)) {
317 sm_wadr (char *mbox, char *host, char *path)
319 switch (smtalk (SM_RCPT, host && *host ? "RCPT TO:<%s%s@%s>"
321 path ? path : "", mbox, host)) {
331 #endif /* SENDMAILBUG */
356 switch (smtalk (SM_DATA, "DATA")) {
365 #endif /* SENDMAILBUG */
382 sm_wtxt (char *buffer, int len)
388 result = sm_wstream (buffer, len);
391 return (result == NOTOK ? RP_BHST : RP_OK);
398 if (sm_wstream ((char *) NULL, 0) == NOTOK)
401 switch (smtalk (SM_DOT + 3 * sm_addrs, ".")) {
409 #endif /* SENDMAILBUG */
427 if (sm_rfp == NULL && sm_wfp == NULL)
432 smtalk (SM_QUIT, "QUIT");
436 sm_note.code = sm_reply.code;
437 strncpy (sm_note.text, sm_reply.text, sm_note.length = sm_reply.length);/* fall */
439 if (smtalk (SM_RSET, "RSET") == 250 && type == DONE)
441 smtalk (SM_QUIT, "QUIT");
443 sm_reply.code = sm_note.code;
444 strncpy (sm_reply.text, sm_note.text, sm_reply.length = sm_note.length);
461 if (sm_rfp != NULL) {
466 if (sm_wfp != NULL) {
473 sm_rfp = sm_wfp = NULL;
474 return (status ? RP_BHST : RP_OK);
483 int cc, i, j, k, result;
485 char *dp, *bp, *cp, s;
486 char buffer[BUFSIZ], sender[BUFSIZ];
490 k = strlen (file) - sizeof(".bulk");
491 if ((fp = fopen (file, "r")) == NULL) {
494 snprintf (sm_reply.text, sizeof(sm_reply.text),
495 "unable to read %s: ", file);
499 if ((s = strerror (errno)))
500 strncpy (bp, s, sizeof(sm_reply.text) - len);
502 snprintf (bp, sizeof(sm_reply.text) - len, "Error %d", errno);
503 sm_reply.length = strlen (sm_reply.text);
504 sm_reply.code = NOTOK;
508 printf ("reading file %s\n", file);
513 while (fgets (buffer, sizeof(buffer), fp)) {
515 strncpy (sender, buffer + sizeof("MAIL FROM:") - 1, sizeof(sender));
516 if (strcmp (buffer, "DATA\r\n") == 0) {
523 printf ("no DATA...\n");
527 snprintf (buffer, sizeof(buffer), "%s.bad", file);
528 rename (file, buffer);
530 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
539 printf ("no %srecipients...\n", j < 1 ? "sender or " : "");
545 if ((cp = malloc ((size_t) (cc = (pos = ftell (fp)) + 1))) == NULL) {
546 sm_reply.length = strlen (strcpy (sm_reply.text, "out of memory"));
548 sm_reply.code = NOTOK;
552 fseek (fp, 0L, SEEK_SET);
553 for (dp = cp, i = 0; i++ < j; dp += strlen (dp))
554 if (fgets (dp, cc - (dp - cp), fp) == NULL) {
555 sm_reply.length = strlen (strcpy (sm_reply.text, "premature eof"));
562 for (dp = cp, i = cc - 1; i > 0; dp += cc, i -= cc)
563 if ((cc = write (fileno (sm_wfp), dp, i)) == NOTOK) {
566 strcpy (sm_reply.text, "error writing to server: ",
567 sizeof(sm_reply.text));
571 if ((s = strerror (errno)))
572 strncpy (bp, s, sizeof(sm_reply.text) - len);
574 snprintf (bp, sizeof(sm_reply.text) - len,
575 "unknown error %d", errno);
576 sm_reply.length = strlen (sm_reply.text);
581 printf ("wrote %d octets to server\n", cc);
585 for (dp = cp, i = 0; i++ < j; dp = strchr(dp, '\n'), dp++) {
587 if (bp = strchr(dp, '\r'))
589 printf ("=> %s\n", dp);
595 switch (smhear () + (i == 1 ? 1000 : i != j ? 2000 : 3000)) {
607 smtalk (SM_RSET, "RSET");
635 if (k <= 0 || strcmp (sender, "<>\r\n") == 0)
639 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
640 if ((gp = fopen (buffer, "w+")) == NULL)
642 fprintf (gp, "MAIL FROM:<>\r\nRCPT TO:%sDATA\r\n", sender);
645 "To: %*.*s\r\nSubject: Invalid addresses (%s)\r\n",
646 l - 4, l - 4, sender + 1, file);
647 fprintf (gp, "Date: %s\r\nFrom: Postmaster@%s\r\n\r\n",
648 dtimenow (0), LocalName ());
650 if (bp = strchr(dp, '\r'))
652 fprintf (gp, "=> %s\r\n", dp);
655 fprintf (gp, "<= %s\r\n", rp_string (result));
673 smtalk (SM_RSET, "RSET");
676 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
687 smtalk (SM_RSET, "RSET");
699 #ifdef HAVE_ST_BLKSIZE
702 if (fstat (fileno (sm_wfp), &st) == NOTOK || (cc = st.st_blksize) < BUFSIZ)
707 if ((cp = malloc ((size_t) cc)) == NULL) {
708 smtalk (SM_RSET, "RSET");
709 sm_reply.length = strlen (strcpy (sm_reply.text, "out of memory"));
714 fseek (fp, pos, SEEK_SET);
718 for (dp = cp, i = cc; i > 0; dp += j, i -= j)
719 if ((j = fread (cp, sizeof(*cp), i, fp)) == OK) {
723 snprintf (sm_reply.text, sizeof(sm_reply.text),
724 "error reading %s: ", file);
728 if ((s = strerror (errno)))
729 strncpy (bp, s, sizeof(sm_reply.text) - len);
731 snprintf (bp, sizeof(sm_reply.text) - len,
732 "unknown error %d", errno);
733 sm_reply.length = strlen (sm_reply.text);
741 for (dp = cp, i = cc; i > 0; dp += j, i -= j)
742 if ((j = write (fileno (sm_wfp), dp, i)) == NOTOK)
746 printf ("wrote %d octets to server\n", j);
773 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
784 if (k <= 0 || strcmp (sender, "<>\r\n") == 0) {
790 ftruncate (fileno (gp), 0L);
791 fseek (gp, 0L, SEEK_SET);
794 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
795 if ((gp = fopen (buffer, "w")) == NULL)
798 fprintf (gp, "MAIL FROM:<>\r\nRCPT TO:%sDATA\r\n", sender);
800 fprintf (gp, "To: %*.*s\r\nSubject: Failed mail (%s)\r\n",
801 i - 4, i - 4, sender + 1, file);
802 fprintf (gp, "Date: %s\r\nFrom: Postmaster@%s\r\n\r\n",
803 dtimenow (0), LocalName ());
808 fputs ("\r\n------- Begin Returned message\r\n\r\n", gp);
809 fseek (fp, pos, SEEK_SET);
810 while (fgets (buffer, sizeof(buffer), fp)) {
811 if (buffer[0] == '-')
813 if (strcmp (buffer, ".\r\n"))
816 fputs ("\r\n------- End Returned Message\r\n\r\n.\r\n", gp);
830 sm_ierror (char *fmt, ...)
835 vsnprintf (sm_reply.text, sizeof(sm_reply.text), fmt, ap);
838 sm_reply.length = strlen (sm_reply.text);
839 sm_reply.code = NOTOK;
846 smtalk (int time, char *fmt, ...)
853 vsnprintf (buffer, sizeof(buffer), fmt, ap);
857 printf ("=> %s\n", buffer);
865 if (strcmp (buffer, ".") == 0)
867 fprintf (sm_wfp, "%s\r\n", buffer);
873 snprintf (file, sizeof(file), "%s%c.bulk", sm_tmpfil,
874 (char) (sm_ispool + 'a' - 1));
875 if (rename (sm_tmpfil, file) == NOTOK) {
879 snprintf (sm_reply.text, sizeof(sm_reply.text),
880 "error renaming %s to %s: ", sm_tmpfil, file);
884 if ((s = strerror (errno)))
885 strncpy (bp, s, sizeof(sm_reply.text) - len);
887 snprintf (bp, sizeof(sm_reply.text) - len,
888 "unknown error %d", errno);
889 sm_reply.length = strlen (sm_reply.text);
890 sm_reply.code = NOTOK;
894 if (sm_wfp = fopen (sm_tmpfil, "w"))
895 chmod (sm_tmpfil, 0600);
906 ftruncate (fileno (sm_wfp), 0L);
907 fseek (sm_wfp, 0L, SEEK_SET);
926 printf ("<= %d\n", result);
930 sm_reply.text[sm_reply.length = 0] = NULL;
931 return (sm_reply.code = result);
936 alarm ((unsigned) time);
937 if ((result = sm_wrecord (buffer, strlen (buffer))) != NOTOK)
946 * write the buffer to the open SMTP channel
950 sm_wrecord (char *buffer, int len)
955 fwrite (buffer, sizeof(*buffer), len, sm_wfp);
956 fputs ("\r\n", sm_wfp);
959 return (ferror (sm_wfp) ? sm_werror () : OK);
964 sm_wstream (char *buffer, int len)
967 static char lc = '\0';
972 if (buffer == NULL && len == 0) {
974 fputs ("\r\n", sm_wfp);
976 return (ferror (sm_wfp) ? sm_werror () : OK);
979 for (bp = buffer; len > 0; bp++, len--) {
983 fputc ('\r', sm_wfp);
988 fputc ('.', sm_wfp);/* FALL THROUGH */
999 return (ferror (sm_wfp) ? sm_werror () : OK);
1005 * AIX by default will inline the strlen and strcpy commands by redefining
1006 * them as __strlen and __strcpy respectively. This causes compile problems
1007 * with the #ifdef MPOP in the middle. Should the #ifdef MPOP be removed,
1008 * remove these #undefs.
1018 strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no socket opened"
1019 : sm_alarmed ? "write to socket timed out"
1021 : sm_ispool ? "error writing to spool file"
1023 : "error writing to socket"));
1025 return (sm_reply.code = NOTOK);
1032 int i, code, cont, bc, rc, more;
1034 char **ehlo, buffer[BUFSIZ];
1037 static int at_least_once = 0;
1039 if (at_least_once) {
1042 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1056 sm_reply.length = 0;
1057 sm_reply.text[0] = 0;
1059 rc = sizeof(sm_reply.text) - 1;
1061 for (more = FALSE; sm_rrecord (bp = buffer, &bc) != NOTOK;) {
1063 printf ("<= %s\n", buffer);
1068 && strncmp (buffer, "250", sizeof("250") - 1) == 0
1069 && (buffer[3] == '-' || doingEHLO == 2)
1071 if (doingEHLO == 2) {
1072 if ((*ehlo = malloc ((size_t) (strlen (buffer + 4) + 1)))) {
1073 strcpy (*ehlo++, buffer + 4);
1075 if (ehlo >= EHLOkeys + MAXEHLO)
1085 for (; bc > 0 && (!isascii (*bp) || !isdigit (*bp)); bp++, bc--)
1091 for (; bc > 0 && isspace (*bp); bp++, bc--)
1093 if (bc > 0 && *bp == '-') {
1096 for (; bc > 0 && isspace (*bp); bp++, bc--)
1101 if (code != sm_reply.code || cont)
1105 sm_reply.code = code;
1108 strncpy (buffer, sm_noreply, sizeof(buffer));
1110 bc = strlen (sm_noreply);
1114 if ((i = min (bc, rc)) > 0) {
1115 strncpy (rp, bp, i);
1117 if (more && rc > strlen (sm_moreply) + 1) {
1118 strcpy (sm_reply.text + rc, sm_moreply);
1119 rc += strlen (sm_moreply);
1124 if (sm_reply.code < 100) {
1126 printf ("%s\n", sm_reply.text);
1132 sm_reply.length = rp - sm_reply.text;
1133 return sm_reply.code;
1140 sm_rrecord (char *buffer, int *len)
1143 return sm_rerror ();
1145 buffer[*len = 0] = 0;
1147 fgets (buffer, BUFSIZ, sm_rfp);
1148 *len = strlen (buffer);
1149 if (ferror (sm_rfp) || feof (sm_rfp))
1150 return sm_rerror ();
1151 if (buffer[*len - 1] != '\n')
1152 while (getc (sm_rfp) != '\n' && !ferror (sm_rfp) && !feof (sm_rfp))
1155 if (buffer[*len - 2] == '\r')
1157 buffer[*len - 1] = 0;
1167 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no socket opened"
1168 : sm_alarmed ? "read from socket timed out"
1169 : feof (sm_rfp) ? "premature end-of-file on socket"
1170 : "error reading from socket"));
1172 return (sm_reply.code = NOTOK);
1179 #ifndef RELIABLE_SIGNALS
1180 SIGNAL (SIGALRM, alrmser);
1185 printf ("timed out...\n");
1192 rp_string (int code)
1195 static char buffer[BUFSIZ];
1197 switch (sm_reply.code != NOTOK ? code : NOTOK) {
1217 snprintf (buffer, sizeof(buffer), "[%s] %s", text, sm_reply.text);
1237 snprintf (buffer, sizeof(buffer), "[%s] %3d %s",
1238 text, sm_reply.code, sm_reply.text);
1245 static char *broken[MAXARGS + 1];
1248 smail_brkstring (char *strg, char *brksep, char *brkterm)
1255 for (bi = 0; bi < MAXARGS; bi++) {
1256 while (smail_brkany (c = *sp, brksep))
1258 if (!c || smail_brkany (c, brkterm)) {
1265 while ((c = *++sp) && !smail_brkany (c, brksep) && !smail_brkany (c, brkterm))
1268 broken[MAXARGS] = 0;
1275 * returns 1 if chr in strg, 0 otherwise
1278 smail_brkany (char chr, char *strg)
1283 for (sp = strg; *sp; sp++)
1290 * copy a string array and return pointer to end
1293 smail_copyip (char **p, char **q, int len_q)
1295 while (*p && --len_q > 0)
1314 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1316 if (strncmp (ep, s, len) == 0) {
1317 for (ep += len; *ep == ' '; ep++)