3 * mhshowsbr.c -- routines to display the contents of MIME messages
10 #include <h/signals.h>
15 #include <zotnet/mts/mts.h>
18 #include <h/mhparse.h>
20 #ifdef HAVE_SYS_WAIT_H
21 # include <sys/wait.h>
25 * Just use sigjmp/longjmp on older machines that
26 * don't have sigsetjmp/siglongjmp.
28 #ifndef HAVE_SIGSETJMP
29 # define sigjmp_buf jmp_buf
30 # define sigsetjmp(env,mask) setjmp(env)
31 # define siglongjmp(env,val) longjmp(env,val)
43 /* flags for moreproc/header display */
49 static sigjmp_buf intrenv;
53 int SOprintf (char *, ...);
59 int part_ok (CT, int);
60 int type_ok (CT, int);
61 void content_error (char *, CT, char *, ...);
62 void flush_errors (void);
65 int list_switch (CT, int, int, int, int);
66 int list_content (CT, int, int, int, int);
71 void show_all_messages (CT *);
72 int show_content_aux (CT, int, int, char *, char *);
77 static void show_single_message (CT, char *);
78 static void DisplayMsgHeader (CT, char *);
79 static int show_switch (CT, int, int);
80 static int show_content (CT, int, int);
81 static int show_content_aux2 (CT, int, int, char *, char *, int, int, int, int, int);
82 static int show_text (CT, int, int);
83 static int show_multi (CT, int, int);
84 static int show_multi_internal (CT, int, int);
85 static int show_multi_aux (CT, int, int, char *);
86 static int show_message_rfc822 (CT, int, int);
87 static int show_partial (CT, int, int);
88 static int show_external (CT, int, int);
89 static RETSIGTYPE intrser (int);
93 * Top level entry point to show/display a group of messages
97 show_all_messages (CT *cts)
102 * If form is not specified, then get default form
103 * for showing headers of MIME messages.
106 formsw = getcpy (etcpath ("mhl.headers"));
109 * If form is "mhl.null", suppress display of header.
111 if (!strcmp (formsw, "mhl.null"))
114 for (ctp = cts; *ctp; ctp++) {
117 /* if top-level type is ok, then display message */
119 show_single_message (ct, formsw);
125 * Entry point to show/display a single message
129 show_single_message (CT ct, char *form)
142 * If you have a format file, then display
143 * the message headers.
146 DisplayMsgHeader(ct, form);
150 /* Show the body of the message */
151 show_switch (ct, 1, 0);
157 if (ct->c_ceclosefnx)
158 (*ct->c_ceclosefnx) (ct);
160 /* block a few signals */
162 sigaddset (&set, SIGHUP);
163 sigaddset (&set, SIGINT);
164 sigaddset (&set, SIGQUIT);
165 sigaddset (&set, SIGTERM);
166 SIGPROCMASK (SIG_BLOCK, &set, &oset);
168 while (wait (&status) != NOTOK) {
172 pidcheck (status.w_status);
177 /* reset the signal mask */
178 SIGPROCMASK (SIG_SETMASK, &oset, &set);
186 * Use the mhlproc to show the header fields
190 DisplayMsgHeader (CT ct, char *form)
197 vec[vecp++] = r1bindex (mhlproc, '/');
198 vec[vecp++] = "-form";
200 vec[vecp++] = "-nobody";
201 vec[vecp++] = ct->c_file;
204 * If we've specified -(no)moreproc,
205 * then just pass that along.
208 vec[vecp++] = "-nomoreproc";
210 vec[vecp++] = "-moreproc";
211 vec[vecp++] = progsw;
217 for (i = 0; (child_id = vfork()) == NOTOK && i < 5; i++)
222 adios ("fork", "unable to");
226 execvp (mhlproc, vec);
227 fprintf (stderr, "unable to exec ");
240 * Switching routine. Call the correct routine
241 * based on content type.
245 show_switch (CT ct, int serial, int alternate)
247 switch (ct->c_type) {
249 return show_multi (ct, serial, alternate);
253 switch (ct->c_subtype) {
254 case MESSAGE_PARTIAL:
255 return show_partial (ct, serial, alternate);
258 case MESSAGE_EXTERNAL:
259 return show_external (ct, serial, alternate);
264 return show_message_rfc822 (ct, serial, alternate);
270 return show_text (ct, serial, alternate);
277 return show_content (ct, serial, alternate);
281 adios (NULL, "unknown content type %d", ct->c_type);
285 return 0; /* NOT REACHED */
290 * Generic method for displaying content
294 show_content (CT ct, int serial, int alternate)
296 char *cp, buffer[BUFSIZ];
297 CI ci = &ct->c_ctinfo;
299 /* Check for mhn-show-type/subtype */
300 snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
301 invo_name, ci->ci_type, ci->ci_subtype);
302 if ((cp = context_find (buffer)) && *cp != '\0')
303 return show_content_aux (ct, serial, alternate, cp, NULL);
305 /* Check for mhn-show-type */
306 snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
307 if ((cp = context_find (buffer)) && *cp != '\0')
308 return show_content_aux (ct, serial, alternate, cp, NULL);
310 if ((cp = ct->c_showproc))
311 return show_content_aux (ct, serial, alternate, cp, NULL);
313 /* complain if we are not a part of a multipart/alternative */
315 content_error (NULL, ct, "don't know how to display content");
322 * Parse the display string for displaying generic content
326 show_content_aux (CT ct, int serial, int alternate, char *cp, char *cracked)
328 int fd, len, buflen, quoted;
329 int xstdin, xlist, xpause, xtty;
330 char *bp, *pp, *file, buffer[BUFSIZ];
331 CI ci = &ct->c_ctinfo;
333 if (!ct->c_ceopenfnx) {
335 content_error (NULL, ct, "don't know how to decode content");
341 if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK)
343 if (ct->c_showproc && !strcmp (ct->c_showproc, "true"))
344 return (alternate ? DONE : OK);
352 strncpy (buffer, cp, sizeof(buffer));
356 /* get buffer ready to go */
358 buflen = sizeof(buffer) - 1;
359 bp[0] = bp[buflen] = '\0';
362 /* Now parse display string */
363 for ( ; *cp && buflen > 0; cp++) {
369 /* insert parameters from Content-Type field */
374 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
375 snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
385 /* insert content description */
389 s = trimcpy (ct->c_descr);
390 strncpy (bp, s, buflen);
396 /* exclusive execution */
401 /* %e, %f, and stdin is terminal not content */
407 /* insert filename containing content */
408 snprintf (bp, buflen, "'%s'", file);
409 /* since we've quoted the file argument, set things up
410 * to look past it, to avoid problems with the quoting
411 * logic below. (I know, I should figure out what's
412 * broken with the quoting logic, but..)
421 /* %l, and pause prior to displaying content */
426 /* display listing prior to displaying content */
431 /* insert subtype of content */
432 strncpy (bp, ci->ci_subtype, buflen);
436 /* insert character % */
449 /* Did we actually insert something? */
451 /* Insert single quote if not inside quotes already */
452 if (!quoted && buflen) {
454 memmove (pp + 1, pp, len);
459 /* Escape existing quotes */
460 while ((pp = strchr (pp, '\'')) && buflen > 3) {
462 memmove (pp + 3, pp, len);
469 /* If pp is still set, that means we ran out of space. */
472 if (!quoted && buflen) {
489 if (buflen <= 0 || (ct->c_termproc && buflen <= strlen(ct->c_termproc))) {
490 /* content_error would provide a more useful error message
491 * here, except that if we got overrun, it probably would
494 fprintf(stderr, "Buffer overflow constructing show command!\n");
498 /* use charset string to modify display method */
499 if (ct->c_termproc) {
502 strncpy (term, buffer, sizeof(term));
503 snprintf (buffer, sizeof(buffer), ct->c_termproc, term);
507 return show_content_aux2 (ct, serial, alternate, cracked, buffer,
508 fd, xlist, xpause, xstdin, xtty);
513 * Routine to actually display the content
517 show_content_aux2 (CT ct, int serial, int alternate, char *cracked, char *buffer,
518 int fd, int xlist, int xpause, int xstdin, int xtty)
522 char *vec[4], exec[BUFSIZ + sizeof "exec "];
524 if (debugsw || cracked) {
527 fprintf (stderr, "%s msg %s", cracked ? "storing" : "show",
530 fprintf (stderr, " part %s", ct->c_partno);
532 fprintf (stderr, " using command (cd %s; %s)\n", cracked, buffer);
534 fprintf (stderr, " using command %s\n", buffer);
537 if (xpid < 0 || (xtty && xpid)) {
540 pidcheck(pidwait (xpid, NOTOK));
547 if (ct->c_type == CT_MULTIPART)
548 list_content (ct, -1, 1, 0, 0);
550 list_switch (ct, -1, 1, 0, 0);
552 if (xpause && SOprintf ("Press <return> to show content..."))
553 printf ("Press <return> to show content...");
557 SIGNAL_HANDLER istat;
559 istat = SIGNAL (SIGINT, intrser);
560 if ((intr = sigsetjmp (intrenv, 1)) == OK) {
563 read (fileno (stdout), prompt, sizeof(prompt));
565 SIGNAL (SIGINT, istat);
566 if (intr != OK || prompt[0] == 'n') {
567 (*ct->c_ceclosefnx) (ct);
568 return (alternate ? DONE : NOTOK);
570 if (prompt[0] == 'q') done(OK);
574 snprintf (exec, sizeof(exec), "exec %s", buffer);
583 for (i = 0; (child_id = vfork ()) == NOTOK && i < 5; i++)
587 advise ("fork", "unable to");
588 (*ct->c_ceclosefnx) (ct);
597 execvp ("/bin/sh", vec);
598 fprintf (stderr, "unable to exec ");
605 ct->c_pid = child_id;
609 pidcheck (pidXwait (child_id, NULL));
613 (*ct->c_ceclosefnx) (ct);
614 return (alternate ? DONE : OK);
620 * show content of type "text"
624 show_text (CT ct, int serial, int alternate)
626 char *cp, buffer[BUFSIZ];
627 CI ci = &ct->c_ctinfo;
629 /* Check for mhn-show-type/subtype */
630 snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
631 invo_name, ci->ci_type, ci->ci_subtype);
632 if ((cp = context_find (buffer)) && *cp != '\0')
633 return show_content_aux (ct, serial, alternate, cp, NULL);
635 /* Check for mhn-show-type */
636 snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
637 if ((cp = context_find (buffer)) && *cp != '\0')
638 return show_content_aux (ct, serial, alternate, cp, NULL);
641 * Use default method if content is text/plain, or if
642 * if it is not a text part of a multipart/alternative
644 if (!alternate || ct->c_subtype == TEXT_PLAIN) {
645 snprintf (buffer, sizeof(buffer), "%%p%s '%%F'", progsw ? progsw :
646 moreproc && *moreproc ? moreproc : "more");
647 cp = (ct->c_showproc = add (buffer, NULL));
648 return show_content_aux (ct, serial, alternate, cp, NULL);
656 * show message body of type "multipart"
660 show_multi (CT ct, int serial, int alternate)
662 char *cp, buffer[BUFSIZ];
663 CI ci = &ct->c_ctinfo;
665 /* Check for mhn-show-type/subtype */
666 snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
667 invo_name, ci->ci_type, ci->ci_subtype);
668 if ((cp = context_find (buffer)) && *cp != '\0')
669 return show_multi_aux (ct, serial, alternate, cp);
671 /* Check for mhn-show-type */
672 snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
673 if ((cp = context_find (buffer)) && *cp != '\0')
674 return show_multi_aux (ct, serial, alternate, cp);
676 if ((cp = ct->c_showproc))
677 return show_multi_aux (ct, serial, alternate, cp);
680 * Use default method to display this multipart content
681 * if it is not a (nested) part of a multipart/alternative,
682 * or if it is one of the known subtypes of multipart.
684 if (!alternate || ct->c_subtype != MULTI_UNKNOWN)
685 return show_multi_internal (ct, serial, alternate);
692 * show message body of subtypes of multipart that
693 * we understand directly (mixed, alternate, etc...)
697 show_multi_internal (CT ct, int serial, int alternate)
699 int alternating, nowalternate, nowserial, result;
700 struct multipart *m = (struct multipart *) ct->c_ctparams;
706 nowalternate = alternate;
708 if (ct->c_subtype == MULTI_PARALLEL) {
709 nowserial = serialsw;
710 } else if (ct->c_subtype == MULTI_ALTERNATE) {
718 * unknown subtypes of multipart (treat as mixed per rfc2046)
723 /* block a few signals */
726 sigaddset (&set, SIGHUP);
727 sigaddset (&set, SIGINT);
728 sigaddset (&set, SIGQUIT);
729 sigaddset (&set, SIGTERM);
730 SIGPROCMASK (SIG_BLOCK, &set, &oset);
734 * alternate -> we are a part inside an multipart/alternative
735 * alternating -> we are a multipart/alternative
738 result = alternate ? NOTOK : OK;
740 for (part = m->mp_parts; part; part = part->mp_next) {
743 if (part_ok (p, 0) && type_ok (p, 0)) {
746 inneresult = show_switch (p, nowserial, nowalternate);
747 switch (inneresult) {
749 if (alternate && !alternating) {
762 alternate = nowalternate = 0;
772 if (alternating && !part) {
774 content_error (NULL, ct, "don't know how to display any of the contents");
779 if (serial && !nowserial) {
789 for (part = m->mp_parts; part; part = part->mp_next) {
793 if (kill (p->c_pid, 0) == NOTOK)
800 while (kids > 0 && (pid = wait (&status)) != NOTOK) {
804 pidcheck (status.w_status);
807 for (part = m->mp_parts; part; part = part->mp_next) {
812 if (p->c_pid == pid) {
823 /* reset the signal mask */
824 SIGPROCMASK (SIG_SETMASK, &oset, &set);
832 * Parse display string for multipart content
833 * and use external program to display it.
837 show_multi_aux (CT ct, int serial, int alternate, char *cp)
839 int len, buflen, quoted;
840 int xlist, xpause, xtty;
841 char *bp, *pp, *file, buffer[BUFSIZ];
842 struct multipart *m = (struct multipart *) ct->c_ctparams;
844 CI ci = &ct->c_ctinfo;
847 for (part = m->mp_parts; part; part = part->mp_next) {
850 if (!p->c_ceopenfnx) {
852 content_error (NULL, p, "don't know how to decode content");
856 if (p->c_storage == NULL) {
858 if ((*p->c_ceopenfnx) (p, &file) == NOTOK)
861 /* I'm not sure if this is necessary? */
862 p->c_storage = add (file, NULL);
864 if (p->c_showproc && !strcmp (p->c_showproc, "true"))
865 return (alternate ? DONE : OK);
866 (*p->c_ceclosefnx) (p);
874 /* get buffer ready to go */
876 buflen = sizeof(buffer) - 1;
877 bp[0] = bp[buflen] = '\0';
880 /* Now parse display string */
881 for ( ; *cp && buflen > 0; cp++) {
886 /* insert parameters from Content-Type field */
891 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
892 snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
902 /* insert content description */
906 s = trimcpy (ct->c_descr);
907 strncpy (bp, s, buflen);
913 /* exclusive execution */
923 /* insert filename(s) containing content */
927 for (part = m->mp_parts; part; part = part->mp_next) {
930 snprintf (bp, buflen, "%s'%s'", s, p->c_storage);
936 /* set our starting pointer back to bp, to avoid
937 * requoting the filenames we just added
944 /* %l, and pause prior to displaying content */
949 /* display listing prior to displaying content */
954 /* insert subtype of content */
955 strncpy (bp, ci->ci_subtype, buflen);
959 /* insert character % */
972 /* Did we actually insert something? */
974 /* Insert single quote if not inside quotes already */
975 if (!quoted && buflen) {
977 memmove (pp + 1, pp, len);
982 /* Escape existing quotes */
983 while ((pp = strchr (pp, '\'')) && buflen > 3) {
985 memmove (pp + 3, pp, len);
992 /* If pp is still set, that means we ran out of space. */
995 if (!quoted && buflen) {
1012 if (buflen <= 0 || (ct->c_termproc && buflen <= strlen(ct->c_termproc))) {
1013 /* content_error would provide a more useful error message
1014 * here, except that if we got overrun, it probably would
1017 fprintf(stderr, "Buffer overflow constructing show command!\n");
1021 /* use charset string to modify display method */
1022 if (ct->c_termproc) {
1025 strncpy (term, buffer, sizeof(term));
1026 snprintf (buffer, sizeof(buffer), ct->c_termproc, term);
1029 return show_content_aux2 (ct, serial, alternate, NULL, buffer,
1030 NOTOK, xlist, xpause, 0, xtty);
1035 * show content of type "message/rfc822"
1039 show_message_rfc822 (CT ct, int serial, int alternate)
1041 char *cp, buffer[BUFSIZ];
1042 CI ci = &ct->c_ctinfo;
1044 /* Check for mhn-show-type/subtype */
1045 snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
1046 invo_name, ci->ci_type, ci->ci_subtype);
1047 if ((cp = context_find (buffer)) && *cp != '\0')
1048 return show_content_aux (ct, serial, alternate, cp, NULL);
1050 /* Check for mhn-show-type */
1051 snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
1052 if ((cp = context_find (buffer)) && *cp != '\0')
1053 return show_content_aux (ct, serial, alternate, cp, NULL);
1055 if ((cp = ct->c_showproc))
1056 return show_content_aux (ct, serial, alternate, cp, NULL);
1058 /* default method for message/rfc822 */
1059 if (ct->c_subtype == MESSAGE_RFC822) {
1060 cp = (ct->c_showproc = add ("%pshow -file '%F'", NULL));
1061 return show_content_aux (ct, serial, alternate, cp, NULL);
1064 /* complain if we are not a part of a multipart/alternative */
1066 content_error (NULL, ct, "don't know how to display content");
1073 * Show content of type "message/partial".
1077 show_partial (CT ct, int serial, int alternate)
1079 content_error (NULL, ct,
1080 "in order to display this message, you must reassemble it");
1086 * Show content of type "message/external".
1088 * THE ERROR CHECKING IN THIS ONE IS NOT DONE YET.
1092 show_external (CT ct, int serial, int alternate)
1094 struct exbody *e = (struct exbody *) ct->c_ctparams;
1095 CT p = e->eb_content;
1097 if (!type_ok (p, 0))
1100 return show_switch (p, serial, alternate);
1103 content_error (NULL, p, "don't know how to display content");
1112 #ifndef RELIABLE_SIGNALS
1113 SIGNAL (SIGINT, intrser);
1117 siglongjmp (intrenv, DONE);