2 ** slocal.c -- asynchronously filter and deliver new mail
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.
10 ** Under sendmail, users should add the line
12 ** "| /usr/local/mmh/bin/slocal"
14 ** to their $HOME/.forward file.
20 #include <h/rcvmail.h>
21 #include <h/signals.h>
27 #include <sys/ioctl.h>
30 #ifdef INITGROUPS_HEADER
31 #include INITGROUPS_HEADER
34 ** On AIX 4.1, initgroups() is defined and even documented (giving the
35 ** parameter types as char* and int), but doesn't have a prototype in any
36 ** of the system header files. AIX 4.3, SunOS 4.1.3, and ULTRIX 4.2A have
39 extern int initgroups(char*, int);
42 static struct swit switches[] = {
44 { "addr address", 0 },
50 { "sender address", 0 },
52 { "mailbox file", 0 },
54 { "home directory", -4 },
58 { "maildelivery file", 0 },
73 static int globbed = 0; /* have we built "vars" table yet? */
74 static int parsed = 0; /* have we built header field table yet */
76 static int verbose = 0;
79 static char *addr = NULL;
80 static char *user = NULL;
81 static char *info = NULL;
82 static char *file = NULL;
83 static char *sender = NULL;
84 static char *envelope = NULL; /* envelope information ("From " line) */
85 static char *mbox = NULL;
86 static char *home = NULL;
88 static struct passwd *pw; /* passwd file entry */
90 static char ddate[BUFSIZ]; /* record the delivery date */
95 /* flags for pair->p_flags */
97 #define P_ADR 0x01 /* field is address */
98 #define P_HID 0x02 /* special (fake) field */
110 ** Lookup table for matching fields and patterns
111 ** in messages. The rest of the table is added
112 ** when the message is parsed.
114 static struct pair hdrs[NVEC + 1] = {
115 { "source", NULL, P_HID },
116 { "addr", NULL, P_HID },
117 { "Return-Path", NULL, P_ADR },
118 { "Reply-To", NULL, P_ADR },
119 { "From", NULL, P_ADR },
120 { "Sender", NULL, P_ADR },
121 { "To", NULL, P_ADR },
122 { "cc", NULL, P_ADR },
123 { "Resent-Reply-To", NULL, P_ADR },
124 { "Resent-From", NULL, P_ADR },
125 { "Resent-Sender", NULL, P_ADR },
126 { "Resent-To", NULL, P_ADR },
127 { "Resent-Cc", NULL, P_ADR },
132 ** The list of builtin variables to expand in a string
133 ** before it is executed by the "pipe" or "qpipe" action.
135 static struct pair vars[] = {
136 { "sender", NULL, P_NIL },
137 { "address", NULL, P_NIL },
138 { "size", NULL, P_NIL },
139 { "reply-to", NULL, P_CHK },
140 { "info", NULL, P_NIL },
144 extern char **environ;
149 static int localmail(int, char *);
150 static int usr_delivery(int, char *, int);
151 static int split(char *, char **);
152 static int parse(int);
153 static void expand(char *, char *, int);
154 static void glob(int);
155 static struct pair *lookup(struct pair *, char *);
156 static int usr_file(int, char *);
157 static int usr_pipe(int, char *, char *, char **, int);
158 static int usr_folder(int, char *);
159 static void alrmser(int);
160 static void get_sender(char *, char **);
161 static int copy_message(int, char *, int);
162 static void verbose_printf(char *fmt, ...);
163 static void adorn(char *, char *, ...);
164 static void debug_printf(char *fmt, ...);
165 static char *trimstr(char *);
169 main(int argc, char **argv)
173 char *cp, *mdlvr = NULL, buf[BUFSIZ];
174 char mailbox[BUFSIZ], tmpfil[BUFSIZ];
175 char **argp, **arguments;
177 setlocale(LC_ALL, "");
178 invo_name = mhbasename(*argv);
180 arguments = getarguments(invo_name, argc, argv, 0);
183 /* Parse arguments */
184 while ((cp = *argp++)) {
186 switch (smatch(++cp, switches)) {
188 ambigsw(cp, switches);
191 adios(NULL, "-%s unknown", cp);
194 snprintf(buf, sizeof(buf), "%s [switches] [address info sender]", invo_name);
195 print_help(buf, switches, 0);
198 print_version(invo_name);
202 if (!(addr = *argp++)) {
203 /* allow -xyz arguments */
204 adios(NULL, "missing argument to %s",
209 if (!(info = *argp++)) {
210 /* allow -xyz arguments */
211 adios(NULL, "missing argument to %s",
216 if (!(user = *argp++)) {
217 /* allow -xyz arguments */
218 adios(NULL, "missing argument to %s",
223 if (!(file = *argp++) || *file == '-') {
224 adios(NULL, "missing argument to %s",
229 if (!(sender = *argp++)) {
230 /* allow -xyz arguments */
231 adios(NULL, "missing argument to %s",
236 if (!(mbox = *argp++) || *mbox == '-') {
237 adios(NULL, "missing argument to %s",
242 if (!(home = *argp++) || *home == '-') {
243 adios(NULL, "missing argument to %s",
249 if (!(cp = *argp++) || *cp == '-') {
250 adios(NULL, "missing argument to %s",
254 adios(NULL, "only one maildelivery file at a time!");
272 switch (argp - (argv + 1)) {
286 addr = getusername();
289 user = (cp = strchr(addr, '.')) ? ++cp : addr;
291 if (!(pw = getpwnam(user))) {
292 adios(NULL, "no such local user as %s", user);
295 if (chdir(pw->pw_dir) == -1) {
300 if (geteuid() == 0) {
302 initgroups(pw->pw_name, pw->pw_gid);
312 /* Record the delivery time */
313 if (!(now = dlocaltimenow())) {
314 adios(NULL, "unable to ascertain local time");
316 snprintf(ddate, sizeof(ddate), "Delivery-Date: %s\n", dtimenow());
319 ** Copy the message to a temporary file
324 /* getting message from file */
325 if ((tempfd = open(file, O_RDONLY)) == -1) {
326 adios(file, "unable to open");
329 debug_printf("retrieving message from file \"%s\"\n",
332 if ((fd = copy_message(tempfd, tmpfil, 1)) == -1) {
333 adios(NULL, "unable to create temporary file");
337 /* getting message from stdin */
339 debug_printf("retrieving message from stdin\n");
341 if ((fd = copy_message(fileno(stdin), tmpfil, 1)) == -1) {
342 adios(NULL, "unable to create temporary file");
347 debug_printf("temporary file=\"%s\"\n", tmpfil);
351 ** Delete the temp file now or a copy of every single message
352 ** passed through slocal will be left in the /tmp directory until
353 ** deleted manually! This unlink() used to be under an 'else'
354 ** of the 'if (debug)' above, but since some people like to
355 ** always run slocal with -debug and log the results, the /tmp
356 ** directory would get choked over time. Of course, now that
357 ** we always delete the temp file, the "temporary file=" message
358 ** above is somewhat pointless -- someone watching debug output
359 ** wouldn't have a chance to 'tail -f' or 'ln' the temp file
360 ** before it's unlinked. The best thing would be to delay this
361 ** unlink() until later if debug == 1, but I'll leave that for
362 ** someone who cares about the temp-file-accessing functionality
363 ** (they'll have to watch out for cases where we adios()).
367 if (!(fp = fdopen(fd, "r+"))) {
368 adios(NULL, "unable to access temporary file");
371 /* If no sender given, extract it from envelope information. */
373 get_sender(envelope, &sender);
376 snprintf(mailbox, sizeof(mailbox), "%s/%s",
377 mailspool, pw->pw_name);
385 debug_printf("addr=\"%s\"\n", trimstr(addr));
386 debug_printf("user=\"%s\"\n", trimstr(user));
387 debug_printf("info=\"%s\"\n", trimstr(info));
388 debug_printf("sender=\"%s\"\n", trimstr(sender));
389 debug_printf("envelope=\"%s\"\n",
390 envelope ? trimstr(envelope) : "");
391 debug_printf("mbox=\"%s\"\n", trimstr(mbox));
392 debug_printf("home=\"%s\"\n", trimstr(home));
393 debug_printf("ddate=\"%s\"\n", trimstr(ddate));
394 debug_printf("now=%02d:%02d\n\n", now->tw_hour, now->tw_min);
397 /* deliver the message */
398 status = localmail(fd, mdlvr);
400 return (status != -1 ? RCV_MOK : RCV_MBX);
405 ** Main routine for delivering message.
408 localmail(int fd, char *mdlvr)
412 /* delivery according to personal Maildelivery file */
413 if (usr_delivery(fd, mdlvr ? mdlvr : ".maildelivery", 0) != -1) {
416 /* delivery according to global Maildelivery file */
417 snprintf(buf, sizeof buf, "%s/%s", mhetcdir, "maildelivery");
418 if (usr_delivery(fd, buf, 1) != -1) {
422 verbose_printf("(delivering to standard mail spool)\n");
424 /* last resort - deliver to standard mail spool */
425 return usr_file(fd, mbox);
429 #define matches(a,b) (stringdex(b, a) >= 0)
432 ** Parse the delivery file, and process incoming message.
435 usr_delivery(int fd, char *delivery, int su)
437 int i, accept, status=1, won, vecp, next;
438 char *field, *pattern, *action, *result, *string;
439 char buffer[BUFSIZ], tmpbuf[BUFSIZ];
440 char *cp, *vec[NVEC];
445 /* open the delivery file */
446 if (!(fp = fopen(delivery, "r"))) {
449 /* check if delivery file has bad ownership or permissions */
450 if (fstat(fileno(fp), &st) == -1 ||
451 (st.st_uid != 0 && (su || st.st_uid != pw->pw_uid)) ||
452 st.st_mode & (S_IWGRP|S_IWOTH)) {
454 verbose_printf("WARNING: %s has bad ownership/modes (su=%d,uid=%d,owner=%d,mode=0%o)\n", delivery, su, (int) pw->pw_uid, (int) st.st_uid, (int) st.st_mode);
462 /* read and process delivery file */
463 while (fgets(buffer, sizeof(buffer), fp)) {
464 /* skip comments and empty lines */
465 if (*buffer == '#' || *buffer == '\n') {
468 /* zap trailing newline */
469 if ((cp = strchr(buffer, '\n'))) {
472 /* split buffer into fields */
473 vecp = split(buffer, vec);
475 /* check for too few fields */
478 debug_printf("WARNING: entry with only %d fields, skipping.\n", vecp);
483 for (i = 0; vec[i]; i++) {
484 debug_printf("vec[%d]: \"%s\"\n",
495 /* find out how to perform the action */
500 ** If previous condition failed, don't
501 ** do this - else fall through
510 ** If already delivered, skip this action.
511 ** Else consider delivered if action is
522 ** Take action, and consider delivered if
523 ** action is successful.
532 ** Take action, but don't consider delivered,
533 ** even if action is successful
539 /* check if the field matches */
547 ** "default" matches only if the message hasn't
548 ** been delivered yet.
550 if (mh_strcasecmp(field, "default")==0) {
558 /* parse message and build lookup table */
559 if (!parsed && parse(fd) == -1) {
564 ** find header field in lookup table, and
565 ** see if the pattern matches.
567 if ((p = lookup(hdrs, field)) && p->p_value &&
568 matches(p->p_value, pattern)) {
577 /* find out the action to perform */
580 /* deliver to quoted pipe */
581 if (mh_strcasecmp(action, "qpipe")) {
586 expand(tmpbuf, string, fd);
587 if (split(tmpbuf, vec) < 1) {
590 status = usr_pipe(fd, tmpbuf, vec[0], vec, 0);
594 /* deliver to pipe */
595 if (mh_strcasecmp(action, "pipe")) {
602 expand(tmpbuf, string, fd);
605 status = usr_pipe(fd, tmpbuf, "/bin/sh", vec+2, 0);
609 if (mh_strcasecmp(action, "file")==0) {
611 status = usr_file(fd, string);
614 if (mh_strcasecmp(action, "folder")!=0) {
619 /* deliver to nmh folder */
620 status = usr_folder(fd, string);
625 if (mh_strcasecmp(action, "mbox")!=0) {
631 status = usr_file(fd, string);
636 if (mh_strcasecmp(action, "destroy")!=0) {
644 next = 0; /* action failed, mark for 'N' result */
651 return (won ? 0 : -1);
656 ** Split buffer into fields (delimited by whitespace or
657 ** comma's). Return the number of fields found.
660 split(char *cp, char **vec)
667 /* split into a maximum of NVEC fields */
668 for (i = 0; i <= NVEC;) {
671 /* zap any whitespace and comma's */
672 while (isspace(*s) || *s == ',') {
675 /* end of buffer, time to leave */
679 /* get double quote text as a single field */
681 for (vec[i++] = ++s; *s && *s != '"'; s++) {
683 ** Check for escaped double quote. We need
684 ** to shift the string to remove slash.
694 /* zap trailing double quote */
700 if (*s == '\\' && *++s != '"') {
705 /* move forward to next field delimiter */
706 while (*s && !isspace(*s) && *s != ',') {
717 ** Parse the headers of a message, and build the
718 ** lookup table for matching fields and patterns.
726 char name[NAMESZ], field[BUFSIZ];
734 /* get a new FILE pointer to message */
735 if ((fd1 = dup(fd)) == -1) {
738 if (!(in = fdopen(fd1, "r"))) {
744 /* add special entries to lookup table */
745 if ((p = lookup(hdrs, "source"))) {
746 p->p_value = getcpy(sender);
748 if ((p = lookup(hdrs, "addr"))) {
749 p->p_value = getcpy(addr);
753 ** Scan the headers of the message and build a lookup table.
755 for (i = 0, state = FLD;;) {
756 switch (state = m_getfld(state, name, field, sizeof(field),
762 while (state == FLDPLUS) {
763 state = m_getfld(state, name, field,
767 for (p = hdrs; p->p_name; p++) {
768 if (mh_strcasecmp(p->p_name, name)!=0) {
769 if (!(p->p_flags & P_HID)) {
770 if ((cp = p->p_value)) {
771 if (p->p_flags & P_ADR) {
772 dp = cp + strlen(cp) - 1;
776 cp = add(",\n\t", cp);
781 p->p_value = add(lp, cp);
787 if (!p->p_name && i < NVEC) {
788 p->p_name = getcpy(name);
794 if (state != FLDEOF) {
806 advise(NULL, "format error in message");
810 advise(NULL, "internal error in m_getfld");
818 if ((p = lookup(vars, "reply-to"))) {
819 if (!(q = lookup(hdrs, "reply-to")) || !q->p_value) {
820 q = lookup(hdrs, "from");
822 p->p_value = getcpy(q ? q->p_value : "");
823 p->p_flags &= ~P_CHK;
825 debug_printf("vars[%d]: name=\"%s\" value=\"%s\"\n",
826 p - vars, p->p_name, trimstr(p->p_value));
830 for (p = hdrs; p->p_name; p++) {
831 debug_printf("hdrs[%d]: name=\"%s\" value=\"%s\"\n",
833 p->p_value ? trimstr(p->p_value) : "");
841 ** Expand any builtin variables such as $(sender),
842 ** $(address), etc., in a string.
845 expand(char *s1, char *s2, int fd)
853 while ((c = *s2++)) {
854 if (c != '$' || *s2 != '(') {
857 for (cp = ++s2; *s2 && *s2 != ')'; s2++) {
865 if ((p = lookup(vars, cp))) {
866 if (!parsed && (p->p_flags & P_CHK)) {
869 strcpy(s1, p->p_value);
879 ** Fill in the information missing from the "vars"
880 ** table, which is necessary to expand any builtin
881 ** variables in the string for a "pipe" or "qpipe"
894 if ((p = lookup(vars, "sender"))) {
895 p->p_value = getcpy(sender);
897 if ((p = lookup(vars, "address"))) {
898 p->p_value = getcpy(addr);
900 if ((p = lookup(vars, "size"))) {
901 snprintf(buffer, sizeof(buffer), "%d",
902 fstat(fd, &st) != -1 ? (int) st.st_size : 0);
903 p->p_value = getcpy(buffer);
905 if ((p = lookup(vars, "info"))) {
906 p->p_value = getcpy(info);
909 for (p = vars; p->p_name; p++) {
910 debug_printf("vars[%d]: name=\"%s\" value=\"%s\"\n",
911 p - vars, p->p_name, trimstr(p->p_value));
918 ** Find a matching name in a lookup table. If found,
919 ** return the "pairs" entry, else return NULL.
922 lookup(struct pair *pairs, char *key)
924 for (; pairs->p_name; pairs++) {
925 if (!mh_strcasecmp(pairs->p_name, key)) {
934 ** Deliver message by appending to a file, using rcvpack(1).
937 usr_file(int fd, char *mailbox)
942 verbose_printf("delivering to file \"%s\" (mbox style)",
949 return usr_pipe(fd, "rcvpack", "rcvpack", vec, 1);
954 ** Deliver message to a nmh folder, using rcvstore(1).
957 usr_folder(int fd, char *string)
959 char folder[BUFSIZ], *vec[3];
961 /* get folder name ready */
962 if (*string == '+') {
963 strncpy(folder, string, sizeof(folder));
965 snprintf(folder, sizeof(folder), "+%s", string);
968 verbose_printf("delivering to folder \"%s\"", folder + 1);
974 return usr_pipe(fd, "rcvstore", "rcvstore", vec, 1);
978 ** Deliver message to a process.
981 usr_pipe(int fd, char *cmd, char *pgm, char **vec, int suppress)
984 int bytes, seconds, status, n;
988 if (verbose && !suppress) {
989 verbose_printf("delivering to pipe \"%s\"", cmd);
991 lseek(fd, (off_t) 0, SEEK_SET);
993 switch ((child_id = fork())) {
997 adorn("fork", "unable to");
1006 freopen("/dev/null", "w", stdout);
1007 freopen("/dev/null", "w", stderr);
1011 for (n=4; n<OPEN_MAX; n++) {
1016 if ((fd = open("/dev/tty", O_RDWR)) != -1) {
1017 ioctl(fd, TIOCNOTTY, NULL);
1020 #endif /* TIOCNOTTY */
1022 /* put in own process group */
1023 setpgid((pid_t) 0, getpid());
1025 path = getenv("PATH");
1027 m_putenv("USER", pw->pw_name);
1028 m_putenv("HOME", pw->pw_dir);
1029 m_putenv("SHELL", pw->pw_shell);
1030 m_putenv("PATH", path);
1036 /* parent process */
1037 if (setjmp(myctx)) {
1039 ** Ruthlessly kill the child and anything
1040 ** else in its process group.
1042 kill(-child_id, SIGKILL);
1044 verbose_printf(", timed-out; terminated\n");
1047 SIGNAL(SIGALRM, alrmser);
1048 bytes = fstat(fd, &st) != -1 ? (int) st.st_size : 100;
1050 /* amount of time to wait depends on message size */
1052 /* give at least 5 minutes */
1054 } else if (bytes >= 90000) {
1055 /* a half hour is long enough */
1058 seconds = (bytes / 60) + 300;
1060 alarm((unsigned int) seconds);
1061 status = pidwait(child_id, 0);
1066 verbose_printf(", success.\n");
1067 } else if ((status & 0xff00) == 0xff00) {
1068 verbose_printf(", system error\n");
1070 pidstatus(status, stdout, ", failed");
1073 return (status == 0 ? 0 : -1);
1081 longjmp(myctx, DONE);
1086 ** Get the `sender' from the envelope
1087 ** information ("From " line).
1090 get_sender(char *envelope, char **sender)
1094 unsigned char buffer[BUFSIZ];
1097 *sender = getcpy("");
1101 i = strlen("From ");
1102 strncpy(buffer, envelope + i, sizeof(buffer));
1103 buffer[sizeof buffer -1] = '\0'; /* ensure termination */
1104 if ((cp = strchr(buffer, '\n'))) {
1115 for (cp = buffer + strlen(buffer) - 1; cp >= buffer; cp--)
1121 *sender = getcpy(buffer);
1126 ** Copy message into a temporary file.
1127 ** While copying, it will do some header processing
1128 ** including the extraction of the envelope information.
1131 copy_message(int qd, char *tmpfil, int fold)
1133 int i, first = 1, fd1, fd2;
1134 char buffer[BUFSIZ];
1138 tfile = m_mktemp2("/tmp/", invo_name, &fd1, NULL);
1139 if (tfile == NULL) return -1;
1141 strncpy(tmpfil, tfile, BUFSIZ);
1144 while ((i = read(qd, buffer, sizeof(buffer))) > 0) {
1145 if (write(fd1, buffer, i) != i) {
1155 lseek(fd1, (off_t) 0, SEEK_SET);
1159 /* dup the fd for incoming message */
1160 if ((fd2 = dup(qd)) == -1) {
1165 /* now create a FILE pointer for it */
1166 if (!(qfp = fdopen(fd2, "r"))) {
1172 /* dup the fd for temporary file */
1173 if ((fd2 = dup(fd1)) == -1) {
1179 /* now create a FILE pointer for it */
1180 if (!(ffp = fdopen(fd2, "r+"))) {
1188 ** copy message into temporary file
1189 ** and massage the headers. Save
1190 ** a copy of the "From " line for later.
1192 i = strlen("From ");
1193 while (fgets(buffer, sizeof(buffer), qfp)) {
1196 if (strncmp(buffer, "From ", i)==0) {
1198 ** get copy of envelope information
1201 envelope = getcpy(buffer);
1203 /* Put the delivery date in message */
1225 lseek(fd1, (off_t) 0, SEEK_SET);
1236 ** Trim strings for pretty printing of debugging output
1241 char buffer[BUFSIZ*4];
1242 unsigned char *bp, *sp;
1248 /* copy string into temp buffer */
1249 strncpy(buffer, cp, sizeof(buffer));
1252 /* skip over leading whitespace */
1253 while (isspace(*bp)) {
1256 /* start at the end and zap trailing whitespace */
1257 for (sp = bp + strlen(bp) - 1; sp >= bp; sp--) {
1265 /* replace remaining whitespace with spaces */
1266 for (sp = bp; *sp; sp++) {
1275 ** Function for printing `verbose' messages.
1278 verbose_printf(char *fmt, ...)
1283 vfprintf(stdout, fmt, ap);
1290 ** Function for printing `verbose' delivery
1294 adorn(char *what, char *fmt, ...)
1300 eindex = errno; /* save the errno */
1301 fprintf(stdout, ", ");
1304 vfprintf(stdout, fmt, ap);
1309 fprintf(stdout, " %s: ", what);
1311 if ((s = strerror(eindex))) {
1312 fprintf(stdout, "%s", s);
1314 fprintf(stdout, "Error %d", eindex);
1318 fputc('\n', stdout);
1324 ** Function for printing `debug' messages.
1327 debug_printf(char *fmt, ...)
1332 vfprintf(stderr, fmt, ap);