3 * smtp.c -- nmh SMTP interface
10 #include <zotnet/mts/mts.h>
12 #include <h/signals.h>
20 * This module implements an interface to SendMail very similar
21 * to the MMDF mm_(3) routines. The sm_() routines herein talk
22 * SMTP to a sendmail process, mapping SMTP reply codes into
27 * On older 4.2BSD machines without the POSIX function `sigaction',
28 * the alarm handing stuff for time-outs will NOT work due to the way
29 * syscalls get restarted. This is not really crucial, since SendMail
30 * is generally well-behaved in this area.
35 * It appears that some versions of Sendmail will return Code 451
36 * when they don't really want to indicate a failure.
37 * "Code 451 almost always means sendmail has deferred; we don't
38 * really want bomb out at this point since sendmail will rectify
39 * things later." So, if you define SENDMAILBUG, Code 451 is
40 * considered the same as Code 250. Yuck!
48 * these codes must all be different!
50 #define SM_OPEN 90 /* Changed from 30 in case of nameserver flakiness */
61 static int sm_addrs = 0;
62 static int sm_alarmed = 0;
63 static int sm_debug = 0;
64 static int sm_nl = TRUE;
65 static int sm_verbose = 0;
67 static FILE *sm_rfp = NULL;
68 static FILE *sm_wfp = NULL;
71 static int sm_ispool = 0;
72 static char sm_tmpfil[BUFSIZ];
75 static char *sm_noreply = "No reply text given";
76 static char *sm_moreply = "; ";
78 struct smtp sm_reply; /* global... */
84 char *EHLOkeys[MAXEHLO + 1];
89 static int rclient (char *, char *, char *);
90 static int sm_ierror (char *fmt, ...);
91 static int smtalk (int time, char *fmt, ...);
92 static int sm_wrecord (char *, int);
93 static int sm_wstream (char *, int);
94 static int sm_werror (void);
95 static int smhear (void);
96 static int sm_rrecord (char *, int *);
97 static int sm_rerror (void);
98 static RETSIGTYPE alrmser (int);
99 static char *EHLOset (char *);
103 * smtp.c's own static copy of several nmh library subroutines
105 static char **smail_brkstring (char *, char *, char *);
106 static int smail_brkany (char, char *);
107 char **smail_copyip (char **, char **, int);
110 /* from zotnet/mts/client.c */
111 int client (char *, char *, char *, int, char *, int);
114 sm_init (char *client, char *server, int watch, int verbose,
115 int debug, int onex, int queued)
117 int result, sd1, sd2;
122 sm_verbose = verbose;
130 if (sm_rfp != NULL && sm_wfp != NULL)
133 if (client == NULL || *client == '\0') {
137 client = LocalName(); /* no clientname -> LocalName */
142 if (client == NULL || *client == '\0')
143 client = "localhost";
146 if ((sd1 = rclient (server, "tcp", "smtp")) == NOTOK)
157 if ((sm_wfp = fdopen (sd1, "w")) == NULL) {
160 return sm_ierror ("unable to fdopen");
163 sm_reply.text[sm_reply.length = 0] = NULL;
164 return (sm_reply.code = RP_OK);
168 if ((sd2 = dup (sd1)) == NOTOK) {
170 return sm_ierror ("unable to dup");
173 SIGNAL (SIGALRM, alrmser);
174 SIGNAL (SIGPIPE, SIG_IGN);
176 if ((sm_rfp = fdopen (sd1, "r")) == NULL
177 || (sm_wfp = fdopen (sd2, "w")) == NULL) {
180 sm_rfp = sm_wfp = NULL;
181 return sm_ierror ("unable to fdopen");
199 * Give EHLO or HELO command
201 if (client && *client) {
203 result = smtalk (SM_HELO, "EHLO %s", client);
206 if (result >= 500 && result <= 599)
207 result = smtalk (SM_HELO, "HELO %s", client);
216 if (watch && EHLOset ("XVRB"))
217 smtalk (SM_HELO, "VERB on");
218 if (onex && EHLOset ("XONE"))
219 smtalk (SM_HELO, "ONEX");
220 if (queued && EHLOset ("XQUE"))
221 smtalk (SM_HELO, "QUED");
228 # define MAXARGS 1000
232 rclient (char *server, char *protocol, char *service)
235 char response[BUFSIZ];
240 if ((sd = client (server, protocol, service, FALSE, response, sizeof(response))) != NOTOK)
244 if (!server && servers && (cp = strchr(servers, '/'))) {
246 char *arguments[MAXARGS];
248 smail_copyip (smail_brkstring (cp = getcpy (servers), " ", "\n"), arguments, MAXARGS);
250 for (ap = arguments; *ap; ap++)
254 if ((dp = strrchr(*ap, '/')) && *++dp == NULL)
256 snprintf (sm_tmpfil, sizeof(sm_tmpfil), "%s/smtpXXXXXX", *ap);
258 sd = mkstemp (sm_tmpfil);
262 if ((sd = creat (sm_tmpfil, 0600)) != NOTOK) {
275 sm_ierror ("%s", response);
281 sm_winit (int mode, char *from)
286 if (sm_ispool && !sm_wfp) {
287 strlen (strcpy (sm_reply.text, "unable to create new spool file"));
288 sm_reply.code = NOTOK;
311 switch (smtalk (SM_MAIL, "%s FROM:<%s>", smtpcom, from)) {
328 sm_wadr (char *mbox, char *host, char *path)
330 switch (smtalk (SM_RCPT, host && *host ? "RCPT TO:<%s%s@%s>"
332 path ? path : "", mbox, host)) {
342 #endif /* SENDMAILBUG */
367 switch (smtalk (SM_DATA, "DATA")) {
376 #endif /* SENDMAILBUG */
393 sm_wtxt (char *buffer, int len)
399 result = sm_wstream (buffer, len);
402 return (result == NOTOK ? RP_BHST : RP_OK);
409 if (sm_wstream ((char *) NULL, 0) == NOTOK)
412 switch (smtalk (SM_DOT + 3 * sm_addrs, ".")) {
420 #endif /* SENDMAILBUG */
438 if (sm_rfp == NULL && sm_wfp == NULL)
443 smtalk (SM_QUIT, "QUIT");
447 sm_note.code = sm_reply.code;
448 strncpy (sm_note.text, sm_reply.text, sm_note.length = sm_reply.length);/* fall */
450 if (smtalk (SM_RSET, "RSET") == 250 && type == DONE)
452 smtalk (SM_QUIT, "QUIT");
454 sm_reply.code = sm_note.code;
455 strncpy (sm_reply.text, sm_note.text, sm_reply.length = sm_note.length);
472 if (sm_rfp != NULL) {
477 if (sm_wfp != NULL) {
484 sm_rfp = sm_wfp = NULL;
485 return (status ? RP_BHST : RP_OK);
494 int cc, i, j, k, result;
496 char *dp, *bp, *cp, s;
497 char buffer[BUFSIZ], sender[BUFSIZ];
501 k = strlen (file) - sizeof(".bulk");
502 if ((fp = fopen (file, "r")) == NULL) {
505 snprintf (sm_reply.text, sizeof(sm_reply.text),
506 "unable to read %s: ", file);
510 if ((s = strerror (errno)))
511 strncpy (bp, s, sizeof(sm_reply.text) - len);
513 snprintf (bp, sizeof(sm_reply.text) - len, "Error %d", errno);
514 sm_reply.length = strlen (sm_reply.text);
515 sm_reply.code = NOTOK;
519 printf ("reading file %s\n", file);
524 while (fgets (buffer, sizeof(buffer), fp)) {
526 strncpy (sender, buffer + sizeof("MAIL FROM:") - 1, sizeof(sender));
527 if (strcmp (buffer, "DATA\r\n") == 0) {
534 printf ("no DATA...\n");
538 snprintf (buffer, sizeof(buffer), "%s.bad", file);
539 rename (file, buffer);
541 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
550 printf ("no %srecipients...\n", j < 1 ? "sender or " : "");
556 if ((cp = malloc ((size_t) (cc = (pos = ftell (fp)) + 1))) == NULL) {
557 sm_reply.length = strlen (strcpy (sm_reply.text, "out of memory"));
559 sm_reply.code = NOTOK;
563 fseek (fp, 0L, SEEK_SET);
564 for (dp = cp, i = 0; i++ < j; dp += strlen (dp))
565 if (fgets (dp, cc - (dp - cp), fp) == NULL) {
566 sm_reply.length = strlen (strcpy (sm_reply.text, "premature eof"));
573 for (dp = cp, i = cc - 1; i > 0; dp += cc, i -= cc)
574 if ((cc = write (fileno (sm_wfp), dp, i)) == NOTOK) {
577 strcpy (sm_reply.text, "error writing to server: ",
578 sizeof(sm_reply.text));
582 if ((s = strerror (errno)))
583 strncpy (bp, s, sizeof(sm_reply.text) - len);
585 snprintf (bp, sizeof(sm_reply.text) - len,
586 "unknown error %d", errno);
587 sm_reply.length = strlen (sm_reply.text);
592 printf ("wrote %d octets to server\n", cc);
596 for (dp = cp, i = 0; i++ < j; dp = strchr(dp, '\n'), dp++) {
598 if (bp = strchr(dp, '\r'))
600 printf ("=> %s\n", dp);
606 switch (smhear () + (i == 1 ? 1000 : i != j ? 2000 : 3000)) {
618 smtalk (SM_RSET, "RSET");
646 if (k <= 0 || strcmp (sender, "<>\r\n") == 0)
650 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
651 if ((gp = fopen (buffer, "w+")) == NULL)
653 fprintf (gp, "MAIL FROM:<>\r\nRCPT TO:%sDATA\r\n", sender);
656 "To: %*.*s\r\nSubject: Invalid addresses (%s)\r\n",
657 l - 4, l - 4, sender + 1, file);
658 fprintf (gp, "Date: %s\r\nFrom: Postmaster@%s\r\n\r\n",
659 dtimenow (0), LocalName ());
661 if (bp = strchr(dp, '\r'))
663 fprintf (gp, "=> %s\r\n", dp);
666 fprintf (gp, "<= %s\r\n", rp_string (result));
684 smtalk (SM_RSET, "RSET");
687 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
698 smtalk (SM_RSET, "RSET");
710 #ifdef HAVE_ST_BLKSIZE
713 if (fstat (fileno (sm_wfp), &st) == NOTOK || (cc = st.st_blksize) < BUFSIZ)
718 if ((cp = malloc ((size_t) cc)) == NULL) {
719 smtalk (SM_RSET, "RSET");
720 sm_reply.length = strlen (strcpy (sm_reply.text, "out of memory"));
725 fseek (fp, pos, SEEK_SET);
729 for (dp = cp, i = cc; i > 0; dp += j, i -= j)
730 if ((j = fread (cp, sizeof(*cp), i, fp)) == OK) {
734 snprintf (sm_reply.text, sizeof(sm_reply.text),
735 "error reading %s: ", file);
739 if ((s = strerror (errno)))
740 strncpy (bp, s, sizeof(sm_reply.text) - len);
742 snprintf (bp, sizeof(sm_reply.text) - len,
743 "unknown error %d", errno);
744 sm_reply.length = strlen (sm_reply.text);
752 for (dp = cp, i = cc; i > 0; dp += j, i -= j)
753 if ((j = write (fileno (sm_wfp), dp, i)) == NOTOK)
757 printf ("wrote %d octets to server\n", j);
784 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
795 if (k <= 0 || strcmp (sender, "<>\r\n") == 0) {
801 ftruncate (fileno (gp), 0L);
802 fseek (gp, 0L, SEEK_SET);
805 snprintf (buffer, sizeof(buffer), "%*.*sA.bulk", k, k, file);
806 if ((gp = fopen (buffer, "w")) == NULL)
809 fprintf (gp, "MAIL FROM:<>\r\nRCPT TO:%sDATA\r\n", sender);
811 fprintf (gp, "To: %*.*s\r\nSubject: Failed mail (%s)\r\n",
812 i - 4, i - 4, sender + 1, file);
813 fprintf (gp, "Date: %s\r\nFrom: Postmaster@%s\r\n\r\n",
814 dtimenow (0), LocalName ());
819 fputs ("\r\n------- Begin Returned message\r\n\r\n", gp);
820 fseek (fp, pos, SEEK_SET);
821 while (fgets (buffer, sizeof(buffer), fp)) {
822 if (buffer[0] == '-')
824 if (strcmp (buffer, ".\r\n"))
827 fputs ("\r\n------- End Returned Message\r\n\r\n.\r\n", gp);
841 sm_ierror (char *fmt, ...)
846 vsnprintf (sm_reply.text, sizeof(sm_reply.text), fmt, ap);
849 sm_reply.length = strlen (sm_reply.text);
850 sm_reply.code = NOTOK;
857 smtalk (int time, char *fmt, ...)
864 vsnprintf (buffer, sizeof(buffer), fmt, ap);
868 printf ("=> %s\n", buffer);
876 if (strcmp (buffer, ".") == 0)
878 fprintf (sm_wfp, "%s\r\n", buffer);
884 snprintf (file, sizeof(file), "%s%c.bulk", sm_tmpfil,
885 (char) (sm_ispool + 'a' - 1));
886 if (rename (sm_tmpfil, file) == NOTOK) {
890 snprintf (sm_reply.text, sizeof(sm_reply.text),
891 "error renaming %s to %s: ", sm_tmpfil, file);
895 if ((s = strerror (errno)))
896 strncpy (bp, s, sizeof(sm_reply.text) - len);
898 snprintf (bp, sizeof(sm_reply.text) - len,
899 "unknown error %d", errno);
900 sm_reply.length = strlen (sm_reply.text);
901 sm_reply.code = NOTOK;
905 if (sm_wfp = fopen (sm_tmpfil, "w"))
906 chmod (sm_tmpfil, 0600);
917 ftruncate (fileno (sm_wfp), 0L);
918 fseek (sm_wfp, 0L, SEEK_SET);
937 printf ("<= %d\n", result);
941 sm_reply.text[sm_reply.length = 0] = NULL;
942 return (sm_reply.code = result);
947 alarm ((unsigned) time);
948 if ((result = sm_wrecord (buffer, strlen (buffer))) != NOTOK)
957 * write the buffer to the open SMTP channel
961 sm_wrecord (char *buffer, int len)
966 fwrite (buffer, sizeof(*buffer), len, sm_wfp);
967 fputs ("\r\n", sm_wfp);
970 return (ferror (sm_wfp) ? sm_werror () : OK);
975 sm_wstream (char *buffer, int len)
978 static char lc = '\0';
983 if (buffer == NULL && len == 0) {
985 fputs ("\r\n", sm_wfp);
987 return (ferror (sm_wfp) ? sm_werror () : OK);
990 for (bp = buffer; len > 0; bp++, len--) {
994 fputc ('\r', sm_wfp);
999 fputc ('.', sm_wfp);/* FALL THROUGH */
1003 fputc (*bp, sm_wfp);
1004 if (ferror (sm_wfp))
1005 return sm_werror ();
1010 return (ferror (sm_wfp) ? sm_werror () : OK);
1015 * On some systems, strlen and strcpy are defined as preprocessor macros. This
1016 * causes compile problems with the #ifdef MPOP in the middle. Should the
1017 * #ifdef MPOP be removed, remove these #undefs.
1030 strlen (strcpy (sm_reply.text, sm_wfp == NULL ? "no socket opened"
1031 : sm_alarmed ? "write to socket timed out"
1033 : sm_ispool ? "error writing to spool file"
1035 : "error writing to socket"));
1037 return (sm_reply.code = NOTOK);
1044 int i, code, cont, bc, rc, more;
1046 char **ehlo, buffer[BUFSIZ];
1049 static int at_least_once = 0;
1051 if (at_least_once) {
1054 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1068 sm_reply.length = 0;
1069 sm_reply.text[0] = 0;
1071 rc = sizeof(sm_reply.text) - 1;
1073 for (more = FALSE; sm_rrecord (bp = buffer, &bc) != NOTOK;) {
1075 printf ("<= %s\n", buffer);
1080 && strncmp (buffer, "250", sizeof("250") - 1) == 0
1081 && (buffer[3] == '-' || doingEHLO == 2)
1083 if (doingEHLO == 2) {
1084 if ((*ehlo = malloc ((size_t) (strlen (buffer + 4) + 1)))) {
1085 strcpy (*ehlo++, buffer + 4);
1087 if (ehlo >= EHLOkeys + MAXEHLO)
1097 for (; bc > 0 && (!isascii (*bp) || !isdigit (*bp)); bp++, bc--)
1103 for (; bc > 0 && isspace (*bp); bp++, bc--)
1105 if (bc > 0 && *bp == '-') {
1108 for (; bc > 0 && isspace (*bp); bp++, bc--)
1113 if (code != sm_reply.code || cont)
1117 sm_reply.code = code;
1120 strncpy (buffer, sm_noreply, sizeof(buffer));
1122 bc = strlen (sm_noreply);
1126 if ((i = min (bc, rc)) > 0) {
1127 strncpy (rp, bp, i);
1129 if (more && rc > strlen (sm_moreply) + 1) {
1130 strcpy (sm_reply.text + rc, sm_moreply);
1131 rc += strlen (sm_moreply);
1136 if (sm_reply.code < 100) {
1138 printf ("%s\n", sm_reply.text);
1144 sm_reply.length = rp - sm_reply.text;
1145 return sm_reply.code;
1152 sm_rrecord (char *buffer, int *len)
1155 return sm_rerror ();
1157 buffer[*len = 0] = 0;
1159 fgets (buffer, BUFSIZ, sm_rfp);
1160 *len = strlen (buffer);
1161 if (ferror (sm_rfp) || feof (sm_rfp))
1162 return sm_rerror ();
1163 if (buffer[*len - 1] != '\n')
1164 while (getc (sm_rfp) != '\n' && !ferror (sm_rfp) && !feof (sm_rfp))
1167 if (buffer[*len - 2] == '\r')
1169 buffer[*len - 1] = 0;
1179 strlen (strcpy (sm_reply.text, sm_rfp == NULL ? "no socket opened"
1180 : sm_alarmed ? "read from socket timed out"
1181 : feof (sm_rfp) ? "premature end-of-file on socket"
1182 : "error reading from socket"));
1184 return (sm_reply.code = NOTOK);
1191 #ifndef RELIABLE_SIGNALS
1192 SIGNAL (SIGALRM, alrmser);
1197 printf ("timed out...\n");
1204 rp_string (int code)
1207 static char buffer[BUFSIZ];
1209 switch (sm_reply.code != NOTOK ? code : NOTOK) {
1229 snprintf (buffer, sizeof(buffer), "[%s] %s", text, sm_reply.text);
1249 snprintf (buffer, sizeof(buffer), "[%s] %3d %s",
1250 text, sm_reply.code, sm_reply.text);
1257 static char *broken[MAXARGS + 1];
1260 smail_brkstring (char *strg, char *brksep, char *brkterm)
1267 for (bi = 0; bi < MAXARGS; bi++) {
1268 while (smail_brkany (c = *sp, brksep))
1270 if (!c || smail_brkany (c, brkterm)) {
1277 while ((c = *++sp) && !smail_brkany (c, brksep) && !smail_brkany (c, brkterm))
1280 broken[MAXARGS] = 0;
1287 * returns 1 if chr in strg, 0 otherwise
1290 smail_brkany (char chr, char *strg)
1295 for (sp = strg; *sp; sp++)
1302 * copy a string array and return pointer to end
1305 smail_copyip (char **p, char **q, int len_q)
1307 while (*p && --len_q > 0)
1326 for (ehlo = EHLOkeys; *ehlo; ehlo++) {
1328 if (strncmp (ep, s, len) == 0) {
1329 for (ep += len; *ep == ' '; ep++)