3 * mhshowsbr.c -- routines to display the contents of MIME messages
5 * This code is Copyright (c) 2002, by the authors of nmh. See the
6 * COPYRIGHT file in the root directory of the nmh distribution for
7 * complete copyright information.
12 #include <h/signals.h>
20 #include <h/mhparse.h>
32 /* flags for moreproc/header display */
38 static sigjmp_buf intrenv;
42 int SOprintf (char *, ...);
48 int part_ok (CT, int);
49 int type_ok (CT, int);
50 void content_error (char *, CT, char *, ...);
51 void flush_errors (void);
54 int list_switch (CT, int, int, int, int);
55 int list_content (CT, int, int, int, int);
60 void show_all_messages (CT *);
61 int show_content_aux (CT, int, int, char *, char *);
66 static void show_single_message (CT, char *);
67 static void DisplayMsgHeader (CT, char *);
68 static int show_switch (CT, int, int);
69 static int show_content (CT, int, int);
70 static int show_content_aux2 (CT, int, int, char *, char *, int, int, int, int, int);
71 static int show_text (CT, int, int);
72 static int show_multi (CT, int, int);
73 static int show_multi_internal (CT, int, int);
74 static int show_multi_aux (CT, int, int, char *);
75 static int show_message_rfc822 (CT, int, int);
76 static int show_partial (CT, int, int);
77 static int show_external (CT, int, int);
78 static void intrser (int);
82 * Top level entry point to show/display a group of messages
86 show_all_messages (CT *cts)
91 * If form is not specified, then get default form
92 * for showing headers of MIME messages.
95 formsw = getcpy (etcpath ("mhl.headers"));
98 * If form is "mhl.null", suppress display of header.
100 if (!strcmp (formsw, "mhl.null"))
103 for (ctp = cts; *ctp; ctp++) {
106 /* if top-level type is ok, then display message */
108 show_single_message (ct, formsw);
114 * Entry point to show/display a single message
118 show_single_message (CT ct, char *form)
124 /* Allow user executable bit so that temporary directories created by
125 * the viewer (e.g., lynx) are going to be accessible */
126 umask (ct->c_umask & ~(0100));
129 * If you have a format file, then display
130 * the message headers.
133 DisplayMsgHeader(ct, form);
137 /* Show the body of the message */
138 show_switch (ct, 1, 0);
144 if (ct->c_ceclosefnx)
145 (*ct->c_ceclosefnx) (ct);
147 /* block a few signals */
149 sigaddset (&set, SIGHUP);
150 sigaddset (&set, SIGINT);
151 sigaddset (&set, SIGQUIT);
152 sigaddset (&set, SIGTERM);
153 sigprocmask (SIG_BLOCK, &set, &oset);
155 while (wait (&status) != NOTOK) {
160 /* reset the signal mask */
161 sigprocmask (SIG_SETMASK, &oset, &set);
169 * Use the mhlproc to show the header fields
173 DisplayMsgHeader (CT ct, char *form)
180 vec[vecp++] = r1bindex (mhlproc, '/');
181 vec[vecp++] = "-form";
183 vec[vecp++] = "-nobody";
184 vec[vecp++] = ct->c_file;
187 * If we've specified -(no)moreproc,
188 * then just pass that along.
191 vec[vecp++] = "-nomoreproc";
193 vec[vecp++] = "-moreproc";
194 vec[vecp++] = progsw;
200 for (i = 0; (child_id = vfork()) == NOTOK && i < 5; i++)
205 adios ("fork", "unable to");
209 execvp (mhlproc, vec);
210 fprintf (stderr, "unable to exec ");
223 * Switching routine. Call the correct routine
224 * based on content type.
228 show_switch (CT ct, int serial, int alternate)
230 switch (ct->c_type) {
232 return show_multi (ct, serial, alternate);
236 switch (ct->c_subtype) {
237 case MESSAGE_PARTIAL:
238 return show_partial (ct, serial, alternate);
241 case MESSAGE_EXTERNAL:
242 return show_external (ct, serial, alternate);
247 return show_message_rfc822 (ct, serial, alternate);
253 return show_text (ct, serial, alternate);
260 return show_content (ct, serial, alternate);
264 adios (NULL, "unknown content type %d", ct->c_type);
268 return 0; /* NOT REACHED */
273 * Generic method for displaying content
277 show_content (CT ct, int serial, int alternate)
279 char *cp, buffer[BUFSIZ];
280 CI ci = &ct->c_ctinfo;
282 /* Check for mhn-show-type/subtype */
283 snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
284 invo_name, ci->ci_type, ci->ci_subtype);
285 if ((cp = context_find (buffer)) && *cp != '\0')
286 return show_content_aux (ct, serial, alternate, cp, NULL);
288 /* Check for mhn-show-type */
289 snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
290 if ((cp = context_find (buffer)) && *cp != '\0')
291 return show_content_aux (ct, serial, alternate, cp, NULL);
293 if ((cp = ct->c_showproc))
294 return show_content_aux (ct, serial, alternate, cp, NULL);
296 /* complain if we are not a part of a multipart/alternative */
298 content_error (NULL, ct, "don't know how to display content");
305 * Parse the display string for displaying generic content
309 show_content_aux (CT ct, int serial, int alternate, char *cp, char *cracked)
311 int fd, len, buflen, quoted;
312 int xstdin, xlist, xpause, xtty;
313 char *bp, *pp, *file, buffer[BUFSIZ];
314 CI ci = &ct->c_ctinfo;
316 if (!ct->c_ceopenfnx) {
318 content_error (NULL, ct, "don't know how to decode content");
324 if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK)
326 if (ct->c_showproc && !strcmp (ct->c_showproc, "true"))
327 return (alternate ? DONE : OK);
335 strncpy (buffer, cp, sizeof(buffer));
339 /* get buffer ready to go */
341 buflen = sizeof(buffer) - 1;
342 bp[0] = bp[buflen] = '\0';
345 /* Now parse display string */
346 for ( ; *cp && buflen > 0; cp++) {
352 /* insert parameters from Content-Type field */
357 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
358 snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
368 /* insert content description */
372 s = trimcpy (ct->c_descr);
373 strncpy (bp, s, buflen);
379 /* exclusive execution */
384 /* %e, %f, and stdin is terminal not content */
390 /* insert filename containing content */
391 snprintf (bp, buflen, "'%s'", file);
392 /* since we've quoted the file argument, set things up
393 * to look past it, to avoid problems with the quoting
394 * logic below. (I know, I should figure out what's
395 * broken with the quoting logic, but..)
404 /* %l, and pause prior to displaying content */
409 /* display listing prior to displaying content */
414 /* insert subtype of content */
415 strncpy (bp, ci->ci_subtype, buflen);
419 /* insert character % */
432 /* Did we actually insert something? */
434 /* Insert single quote if not inside quotes already */
435 if (!quoted && buflen) {
437 memmove (pp + 1, pp, len);
442 /* Escape existing quotes */
443 while ((pp = strchr (pp, '\'')) && buflen > 3) {
445 memmove (pp + 3, pp, len);
452 /* If pp is still set, that means we ran out of space. */
455 if (!quoted && buflen) {
472 if (buflen <= 0 || (ct->c_termproc && buflen <= strlen(ct->c_termproc))) {
473 /* content_error would provide a more useful error message
474 * here, except that if we got overrun, it probably would
477 fprintf(stderr, "Buffer overflow constructing show command!\n");
481 /* use charset string to modify display method */
482 if (ct->c_termproc) {
485 strncpy (term, buffer, sizeof(term));
486 snprintf (buffer, sizeof(buffer), ct->c_termproc, term);
490 return show_content_aux2 (ct, serial, alternate, cracked, buffer,
491 fd, xlist, xpause, xstdin, xtty);
496 * Routine to actually display the content
500 show_content_aux2 (CT ct, int serial, int alternate, char *cracked, char *buffer,
501 int fd, int xlist, int xpause, int xstdin, int xtty)
505 char *vec[4], exec[BUFSIZ + sizeof "exec "];
507 if (debugsw || cracked) {
510 fprintf (stderr, "%s msg %s", cracked ? "storing" : "show",
513 fprintf (stderr, " part %s", ct->c_partno);
515 fprintf (stderr, " using command (cd %s; %s)\n", cracked, buffer);
517 fprintf (stderr, " using command %s\n", buffer);
520 if (xpid < 0 || (xtty && xpid)) {
523 pidcheck(pidwait (xpid, NOTOK));
530 if (ct->c_type == CT_MULTIPART)
531 list_content (ct, -1, 1, 0, 0);
533 list_switch (ct, -1, 1, 0, 0);
535 if (xpause && SOprintf ("Press <return> to show content..."))
536 printf ("Press <return> to show content...");
540 SIGNAL_HANDLER istat;
542 istat = SIGNAL (SIGINT, intrser);
543 if ((intr = sigsetjmp (intrenv, 1)) == OK) {
546 read (fileno (stdout), prompt, sizeof(prompt));
548 SIGNAL (SIGINT, istat);
549 if (intr != OK || prompt[0] == 'n') {
550 (*ct->c_ceclosefnx) (ct);
551 return (alternate ? DONE : NOTOK);
553 if (prompt[0] == 'q') done(OK);
557 snprintf (exec, sizeof(exec), "exec %s", buffer);
566 for (i = 0; (child_id = vfork ()) == NOTOK && i < 5; i++)
570 advise ("fork", "unable to");
571 (*ct->c_ceclosefnx) (ct);
580 execvp ("/bin/sh", vec);
581 fprintf (stderr, "unable to exec ");
588 ct->c_pid = child_id;
592 pidcheck (pidXwait (child_id, NULL));
596 (*ct->c_ceclosefnx) (ct);
597 return (alternate ? DONE : OK);
603 * show content of type "text"
607 show_text (CT ct, int serial, int alternate)
609 char *cp, buffer[BUFSIZ];
610 CI ci = &ct->c_ctinfo;
612 /* Check for mhn-show-type/subtype */
613 snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
614 invo_name, ci->ci_type, ci->ci_subtype);
615 if ((cp = context_find (buffer)) && *cp != '\0')
616 return show_content_aux (ct, serial, alternate, cp, NULL);
618 /* Check for mhn-show-type */
619 snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
620 if ((cp = context_find (buffer)) && *cp != '\0')
621 return show_content_aux (ct, serial, alternate, cp, NULL);
624 * Use default method if content is text/plain, or if
625 * if it is not a text part of a multipart/alternative
627 if (!alternate || ct->c_subtype == TEXT_PLAIN) {
628 snprintf (buffer, sizeof(buffer), "%%p%s '%%F'", progsw ? progsw :
629 moreproc && *moreproc ? moreproc : "more");
630 cp = (ct->c_showproc = add (buffer, NULL));
631 return show_content_aux (ct, serial, alternate, cp, NULL);
639 * show message body of type "multipart"
643 show_multi (CT ct, int serial, int alternate)
645 char *cp, buffer[BUFSIZ];
646 CI ci = &ct->c_ctinfo;
648 /* Check for mhn-show-type/subtype */
649 snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
650 invo_name, ci->ci_type, ci->ci_subtype);
651 if ((cp = context_find (buffer)) && *cp != '\0')
652 return show_multi_aux (ct, serial, alternate, cp);
654 /* Check for mhn-show-type */
655 snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
656 if ((cp = context_find (buffer)) && *cp != '\0')
657 return show_multi_aux (ct, serial, alternate, cp);
659 if ((cp = ct->c_showproc))
660 return show_multi_aux (ct, serial, alternate, cp);
663 * Use default method to display this multipart content
664 * if it is not a (nested) part of a multipart/alternative,
665 * or if it is one of the known subtypes of multipart.
667 if (!alternate || ct->c_subtype != MULTI_UNKNOWN)
668 return show_multi_internal (ct, serial, alternate);
675 * show message body of subtypes of multipart that
676 * we understand directly (mixed, alternate, etc...)
680 show_multi_internal (CT ct, int serial, int alternate)
682 int alternating, nowalternate, nowserial, result;
683 struct multipart *m = (struct multipart *) ct->c_ctparams;
689 nowalternate = alternate;
691 if (ct->c_subtype == MULTI_PARALLEL) {
692 nowserial = serialsw;
693 } else if (ct->c_subtype == MULTI_ALTERNATE) {
701 * unknown subtypes of multipart (treat as mixed per rfc2046)
706 /* block a few signals */
709 sigaddset (&set, SIGHUP);
710 sigaddset (&set, SIGINT);
711 sigaddset (&set, SIGQUIT);
712 sigaddset (&set, SIGTERM);
713 sigprocmask (SIG_BLOCK, &set, &oset);
717 * alternate -> we are a part inside an multipart/alternative
718 * alternating -> we are a multipart/alternative
721 result = alternate ? NOTOK : OK;
723 for (part = m->mp_parts; part; part = part->mp_next) {
726 if (part_ok (p, 1) && type_ok (p, 1)) {
729 inneresult = show_switch (p, nowserial, nowalternate);
730 switch (inneresult) {
732 if (alternate && !alternating) {
745 alternate = nowalternate = 0;
755 if (alternating && !part) {
757 content_error (NULL, ct, "don't know how to display any of the contents");
762 if (serial && !nowserial) {
768 for (part = m->mp_parts; part; part = part->mp_next) {
772 if (kill (p->c_pid, 0) == NOTOK)
779 while (kids > 0 && (pid = wait (&status)) != NOTOK) {
782 for (part = m->mp_parts; part; part = part->mp_next) {
787 if (p->c_pid == pid) {
798 /* reset the signal mask */
799 sigprocmask (SIG_SETMASK, &oset, &set);
807 * Parse display string for multipart content
808 * and use external program to display it.
812 show_multi_aux (CT ct, int serial, int alternate, char *cp)
814 int len, buflen, quoted;
815 int xlist, xpause, xtty;
816 char *bp, *pp, *file, buffer[BUFSIZ];
817 struct multipart *m = (struct multipart *) ct->c_ctparams;
819 CI ci = &ct->c_ctinfo;
822 for (part = m->mp_parts; part; part = part->mp_next) {
825 if (!p->c_ceopenfnx) {
827 content_error (NULL, p, "don't know how to decode content");
831 if (p->c_storage == NULL) {
833 if ((*p->c_ceopenfnx) (p, &file) == NOTOK)
836 /* I'm not sure if this is necessary? */
837 p->c_storage = add (file, NULL);
839 if (p->c_showproc && !strcmp (p->c_showproc, "true"))
840 return (alternate ? DONE : OK);
841 (*p->c_ceclosefnx) (p);
849 /* get buffer ready to go */
851 buflen = sizeof(buffer) - 1;
852 bp[0] = bp[buflen] = '\0';
855 /* Now parse display string */
856 for ( ; *cp && buflen > 0; cp++) {
861 /* insert parameters from Content-Type field */
866 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
867 snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
877 /* insert content description */
881 s = trimcpy (ct->c_descr);
882 strncpy (bp, s, buflen);
888 /* exclusive execution */
898 /* insert filename(s) containing content */
902 for (part = m->mp_parts; part; part = part->mp_next) {
905 snprintf (bp, buflen, "%s'%s'", s, p->c_storage);
911 /* set our starting pointer back to bp, to avoid
912 * requoting the filenames we just added
919 /* %l, and pause prior to displaying content */
924 /* display listing prior to displaying content */
929 /* insert subtype of content */
930 strncpy (bp, ci->ci_subtype, buflen);
934 /* insert character % */
947 /* Did we actually insert something? */
949 /* Insert single quote if not inside quotes already */
950 if (!quoted && buflen) {
952 memmove (pp + 1, pp, len);
957 /* Escape existing quotes */
958 while ((pp = strchr (pp, '\'')) && buflen > 3) {
960 memmove (pp + 3, pp, len);
967 /* If pp is still set, that means we ran out of space. */
970 if (!quoted && buflen) {
987 if (buflen <= 0 || (ct->c_termproc && buflen <= strlen(ct->c_termproc))) {
988 /* content_error would provide a more useful error message
989 * here, except that if we got overrun, it probably would
992 fprintf(stderr, "Buffer overflow constructing show command!\n");
996 /* use charset string to modify display method */
997 if (ct->c_termproc) {
1000 strncpy (term, buffer, sizeof(term));
1001 snprintf (buffer, sizeof(buffer), ct->c_termproc, term);
1004 return show_content_aux2 (ct, serial, alternate, NULL, buffer,
1005 NOTOK, xlist, xpause, 0, xtty);
1010 * show content of type "message/rfc822"
1014 show_message_rfc822 (CT ct, int serial, int alternate)
1016 char *cp, buffer[BUFSIZ];
1017 CI ci = &ct->c_ctinfo;
1019 /* Check for mhn-show-type/subtype */
1020 snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
1021 invo_name, ci->ci_type, ci->ci_subtype);
1022 if ((cp = context_find (buffer)) && *cp != '\0')
1023 return show_content_aux (ct, serial, alternate, cp, NULL);
1025 /* Check for mhn-show-type */
1026 snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
1027 if ((cp = context_find (buffer)) && *cp != '\0')
1028 return show_content_aux (ct, serial, alternate, cp, NULL);
1030 if ((cp = ct->c_showproc))
1031 return show_content_aux (ct, serial, alternate, cp, NULL);
1033 /* default method for message/rfc822 */
1034 if (ct->c_subtype == MESSAGE_RFC822) {
1035 cp = (ct->c_showproc = add ("%pshow -file '%F'", NULL));
1036 return show_content_aux (ct, serial, alternate, cp, NULL);
1039 /* complain if we are not a part of a multipart/alternative */
1041 content_error (NULL, ct, "don't know how to display content");
1048 * Show content of type "message/partial".
1052 show_partial (CT ct, int serial, int alternate)
1054 NMH_UNUSED (serial);
1055 NMH_UNUSED (alternate);
1057 content_error (NULL, ct,
1058 "in order to display this message, you must reassemble it");
1064 * Show content of type "message/external".
1066 * THE ERROR CHECKING IN THIS ONE IS NOT DONE YET.
1070 show_external (CT ct, int serial, int alternate)
1072 struct exbody *e = (struct exbody *) ct->c_ctparams;
1073 CT p = e->eb_content;
1075 if (!type_ok (p, 0))
1078 return show_switch (p, serial, alternate);
1081 content_error (NULL, p, "don't know how to display content");
1093 siglongjmp (intrenv, DONE);