2 ** mhbuild.c -- expand/translate MIME composition files
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 ** This code was originally part of mhn.c. I split it into
11 ** a separate program (mhbuild.c). But the code still has some of
12 ** the mhn.c code in it. This program needs additional
13 ** streamlining and removal of unneeded code.
21 #include <h/mhparse.h>
29 #ifdef HAVE_SYS_TIME_H
30 # include <sys/time.h>
34 static struct swit switches[] = {
50 ** Directory to place tmp files. This must
51 ** be set before these routines are called.
57 static char prefix[] = "----- =_aaaaaaaaaa";
65 int make_intermediates(char *);
66 void content_error(char *, CT, char *, ...);
69 void free_content(CT);
71 void free_encoding(CT, int);
76 static int init_decoded_content(CT);
77 static char *fgetstr(char *, int, FILE *);
78 static int user_content(FILE *, char *, char *, CT *);
79 static void set_id(CT, int);
80 static int compose_content(CT);
81 static int scan_content(CT);
82 static int build_headers(CT);
83 static CT build_mime(char *);
92 static char infile[BUFSIZ];
93 static int unlink_infile = 0;
95 static char outfile[BUFSIZ];
96 static int unlink_outfile = 0;
101 int output_message(CT, char *);
102 int output_message_fp(CT, FILE *, char*);
105 void set_endian(void);
108 void free_content(CT);
112 main(int argc, char **argv)
114 char *cp, buf[BUFSIZ];
115 char buffer[BUFSIZ], *compfile = NULL;
116 char **argp, **arguments;
121 if (atexit(unlink_done) != 0) {
122 adios(EX_OSERR, NULL, "atexit failed");
125 setlocale(LC_ALL, "");
126 invo_name = mhbasename(argv[0]);
128 /* read user profile/context */
131 arguments = getarguments(invo_name, argc, argv, 1);
134 while ((cp = *argp++)) {
135 if (cp[0] == '-' && cp[1] == '\0') {
137 adios(EX_USAGE, NULL, "cannot specify both standard input and a file");
140 verbosw = 0; /* turn off -verbose listings */
144 switch (smatch(++cp, switches)) {
146 ambigsw(cp, switches);
149 adios(EX_USAGE, NULL, "-%s unknown", cp);
152 snprintf(buf, sizeof(buf), "%s [switches] file", invo_name);
153 print_help(buf, switches, 1);
154 exit(argc == 2 ? EX_OK : EX_USAGE);
156 print_version(invo_name);
157 exit(argc == 2 ? EX_OK : EX_USAGE);
171 adios(EX_USAGE, NULL, "only one composition file allowed");
179 ** Check if we've specified an additional profile
181 if ((cp = getenv("MHBUILD"))) {
182 if ((fp = fopen(cp, "r"))) {
183 readconfig((struct node **) 0, fp, cp, 0);
186 admonish("", "unable to read $MHBUILD profile (%s)",
192 ** Read the standard profile setup
194 if ((fp = fopen(cp = etcpath("mhn.defaults"), "r"))) {
195 readconfig((struct node **) 0, fp, cp, 0);
200 ** Check for storage directory. If defined, we
201 ** will store temporary files there. Else we
202 ** store them in standard nmh directory.
204 if ((cp = context_find(nmhstorage)) && *cp)
205 tmp = concat(cp, "/", invo_name, NULL);
207 tmp = getcpy(toabsdir(invo_name));
209 /* Check if we have a file to process */
211 adios(EX_USAGE, NULL, "need to specify a %s composition file",
215 ** Process the composition file from standard input.
217 if (compfile[0] == '-' && compfile[1] == '\0') {
218 /* copy standard input to temporary file */
219 strncpy(infile, m_mktemp(invo_name, NULL, &fp),
221 while (fgets(buffer, BUFSIZ, stdin))
226 /* build the content structures for MIME message */
227 ct = build_mime(infile);
229 /* output MIME message to this temporary file */
230 strncpy(outfile, m_mktemp(invo_name, NULL, &fp_out),
234 /* output the message */
235 output_message_fp(ct, fp_out, outfile);
238 /* output the temp file to standard output */
239 if ((fp = fopen(outfile, "r")) == NULL)
240 adios(EX_IOERR, outfile, "unable to open");
241 while (fgets(buffer, BUFSIZ, fp))
242 fputs(buffer, stdout);
256 ** Process the composition file from a file.
259 /* build the content structures for MIME message */
260 ct = build_mime(compfile);
262 /* output MIME message to this temporary file */
263 strncpy(outfile, m_mktemp2(compfile, invo_name, NULL, &fp_out),
267 /* output the message */
268 output_message_fp(ct, fp_out, outfile);
271 /* Rename composition draft */
272 snprintf(buffer, sizeof(buffer), "%s.orig", compfile);
273 if (rename(compfile, buffer) == NOTOK) {
274 adios(EX_IOERR, buffer, "unable to rename draft %s to", compfile);
277 /* Rename output file to take its place */
278 if (rename(outfile, compfile) == NOTOK) {
279 advise(compfile, "unable to rename output %s to", outfile);
280 rename(buffer, compfile);
294 ** Check if we need to remove stray temporary files.
299 if (unlink_outfile) {
305 ** Main routine for translating composition file
306 ** into valid MIME message. It translates the draft
307 ** into a content structure (actually a tree of content
308 ** structures). This message then can be manipulated
309 ** in various ways, including being output via
313 build_mime(char *infile)
316 struct field f = {{0}};
328 /* open the composition draft */
329 if ((in = fopen(infile, "r")) == NULL) {
330 adios(EX_IOERR, infile, "unable to open for reading");
334 ** Allocate space for primary (outside) content
336 ct = (CT) mh_xcalloc(1, sizeof(*ct));
339 ** Allocate structure for handling decoded content
340 ** for this part. We don't really need this, but
341 ** allocate it to remain consistent.
343 init_decoded_content(ct);
346 ** Parse some of the header fields in the composition
347 ** draft into the linked list of header fields for
348 ** the new MIME message.
350 for (compnum = 1, state = FLD2;;) {
351 switch (state = m_getfld2(state, &f, in)) {
355 /* abort if draft has Mime-Version header field */
356 if (!mh_strcasecmp(f.name, VRSN_FIELD)) {
357 adios(EX_CONFIG, NULL, "draft shouldn't contain %s: field", VRSN_FIELD);
361 ** abort if draft has Content-Transfer-Encoding
364 if (!mh_strcasecmp(f.name, ENCODING_FIELD)) {
365 adios(EX_CONFIG, NULL, "draft shouldn't contain %s: field", ENCODING_FIELD);
368 /* ignore any Content-Type fields in the header */
369 if (!mh_strcasecmp(f.name, TYPE_FIELD)) {
373 /* add the header data to the list */
374 add_header(ct, getcpy(f.name), getcpy(f.value));
379 fseek(in, (long) (-strlen(f.value)), SEEK_CUR);
383 adios(EX_CONFIG, NULL, "draft has empty body -- no directives!");
389 adios(EX_CONFIG, NULL, "message format error in component #%d",
393 adios(EX_SOFTWARE, NULL, "getfld() returned %d", state);
399 ** Iterate through the list of headers and call the function to
400 ** MIME-ify them if required.
402 for (hp = ct->c_first_hf; hp != NULL; hp = hp->next) {
403 if (encode_rfc2047(hp->name, &hp->value, NULL)) {
404 adios(EX_DATAERR, NULL, "Unable to encode header \"%s\"", hp->name);
409 ** Now add the MIME-Version header field
410 ** to the list of header fields.
412 np = getcpy(VRSN_FIELD);
413 vp = concat(" ", VRSN_VALUE, "\n", NULL);
414 add_header(ct, np, vp);
417 ** We initally assume we will find multiple contents in the
418 ** draft. So create a multipart/mixed content to hold everything.
419 ** We can remove this later, if it is not needed.
421 if (get_ctinfo("multipart/mixed", ct, 0) == NOTOK) {
424 ct->c_type = CT_MULTIPART;
425 ct->c_subtype = MULTI_MIXED;
426 ct->c_file = getcpy(infile);
428 m = (struct multipart *) mh_xcalloc(1, sizeof(*m));
429 ct->c_ctparams = (void *) m;
433 ** read and parse the composition file
434 ** and the directives it contains.
436 while (fgetstr(buf, sizeof(buf) - 1, in)) {
440 if (user_content(in, infile, buf, &p) == DONE) {
441 admonish(NULL, "ignoring spurious #end");
447 part = (struct part *) mh_xcalloc(1, sizeof(*part));
454 ** close the composition draft since
455 ** it's not needed any longer.
459 /* check if any contents were found */
461 adios(EX_OSERR, NULL, "no content directives found");
464 ** If only one content was found, then remove and
465 ** free the outer multipart content.
467 if (!m->mp_parts->mp_next) {
470 p = m->mp_parts->mp_part;
471 m->mp_parts->mp_part = NULL;
473 /* move header fields */
474 p->c_first_hf = ct->c_first_hf;
475 p->c_last_hf = ct->c_last_hf;
476 ct->c_first_hf = NULL;
477 ct->c_last_hf = NULL;
486 ** Fill out, or expand directives. Parse and execute
487 ** commands specified by profile composition strings.
491 if ((cp = strchr(prefix, 'a')) == NULL)
492 adios(EX_SOFTWARE, NULL, "internal error(4)");
495 ** Scan the contents. Choose a transfer encoding, and
496 ** check if prefix for multipart boundary clashes with
497 ** any of the contents.
499 while (scan_content(ct) == NOTOK) {
504 adios(EX_SOFTWARE, NULL, "giving up trying to find a unique delimiter string");
510 /* Build the rest of the header field structures */
518 ** Set up structures for placing unencoded
519 ** content when building parts.
523 init_decoded_content(CT ct)
527 ce = (CE) mh_xcalloc(1, sizeof(*ce));
530 ct->c_ceopenfnx = open7Bit; /* since unencoded */
531 ct->c_ceclosefnx = close_encoding;
532 ct->c_cesizefnx = NULL; /* since unencoded */
539 fgetstr(char *s, int n, FILE *stream)
543 for (ep = (cp = s) + n; cp < ep; ) {
546 if (!fgets(cp, n, stream))
547 return (cp != s ? s : NULL);
548 if (cp == s && *cp != '#')
551 cp += (i = strlen(cp)) - 1;
552 if (i <= 1 || *cp-- != '\n' || *cp != '\\')
563 ** Parse the composition draft for text and directives.
564 ** Do initial setup of Content structure.
568 user_content(FILE *in, char *file, char *buf, CT *ctp)
576 struct str2init *s2i;
581 if (buf[0] == '\n' || strcmp(buf, "#\n") == 0) {
586 /* allocate basic Content structure */
587 ct = (CT) mh_xcalloc(1, sizeof(*ct));
590 /* allocate basic structure for handling decoded content */
591 init_decoded_content(ct);
598 ** Handle inline text. Check if line
599 ** is one of the following forms:
601 ** 1) doesn't begin with '#' (implicit directive)
602 ** 2) begins with "##" (implicit directive)
603 ** 3) begins with "#<"
605 if (buf[0] != '#' || buf[1] == '#' || buf[1] == '<') {
609 char content[BUFSIZ];
613 cp = m_mktemp2(NULL, invo_name, NULL, &out);
615 adios(EX_CANTCREAT, "mhbuild", "unable to create temporary file");
617 /* use a temp file to collect the plain text lines */
618 ce->ce_file = getcpy(cp);
621 if (buf[0] == '#' && buf[1] == '<') {
622 strncpy(content, buf + 2, sizeof(content));
629 /* the directive is implicit */
630 strncpy(content, "text/plain", sizeof(content));
632 strncpy(buffer, buf[0] != '#' ? buf : buf + 1, sizeof(buffer));
636 if (headers >= 0 && uprf(buffer, DESCR_FIELD) &&
637 buffer[i=strlen(DESCR_FIELD)] == ':') {
641 ct->c_descr = add(buffer + i + 1, ct->c_descr);
642 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
643 adios(EX_DATAERR, NULL, "end-of-file after %s: field in plaintext", DESCR_FIELD);
651 adios(EX_DATAERR, NULL, "#-directive after %s: field in plaintext", DESCR_FIELD);
659 if (headers >= 0 && uprf(buffer, DISPO_FIELD)
660 && buffer[i = strlen(DISPO_FIELD)] == ':') {
664 ct->c_dispo = add(buffer + i + 1, ct->c_dispo);
665 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
666 adios(EX_DATAERR, NULL, "end-of-file after %s: field in plaintext", DISPO_FIELD);
674 adios(EX_DATAERR, NULL, "#-directive after %s: field in plaintext", DISPO_FIELD);
682 if (headers != 1 || buffer[0] != '\n')
688 if ((cp = fgetstr(buffer, sizeof(buffer) - 1, in))
691 if (buffer[0] == '#') {
694 if (buffer[1] != '#')
696 for (cp = (bp = buffer) + 1; *cp; cp++)
704 /* parse content type */
705 if (get_ctinfo(content, ct, inlineD) == NOTOK)
708 for (s2i = str2cts; s2i->si_key; s2i++)
709 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
711 if (!s2i->si_key && !uprf(ci->ci_type, "X-"))
715 ** check type specified (possibly implicitly)
717 switch (ct->c_type = s2i->si_val) {
719 if (!mh_strcasecmp(ci->ci_subtype, "rfc822")) {
720 ct->c_encoding = CE_7BIT;
725 adios(EX_DATAERR, NULL, "it doesn't make sense to define an in-line %s content",
726 ct->c_type == CT_MESSAGE ? "message" :
732 if ((ct->c_ctinitfnx = s2i->si_init))
733 (*ct->c_ctinitfnx) (ct);
738 fseek(in, pos, SEEK_SET);
743 ** If we've reached this point, the next line
744 ** must be some type of explicit directive.
748 adios(EX_DATAERR, NULL, "The #@ directive i.e. message/external-body "
749 "is not supported anymore.");
752 /* parse directive */
753 if (get_ctinfo(buf+1, ct, 1) == NOTOK)
756 /* check directive against the list of MIME types */
757 for (s2i = str2cts; s2i->si_key; s2i++)
758 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
762 ** Check if the directive specified a valid type.
763 ** This will happen if it was one of the following forms:
769 adios(EX_DATAERR, NULL, "missing subtype in \"#%s\"", ci->ci_type);
771 switch (ct->c_type = s2i->si_val) {
773 adios(EX_DATAERR, NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
777 if (!mh_strcasecmp(ci->ci_subtype, "partial") ||
778 !mh_strcasecmp(ci->ci_subtype,
780 adios(EX_DATAERR, NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype);
783 admonish(NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
787 if ((ct->c_ctinitfnx = s2i->si_init))
788 (*ct->c_ctinitfnx) (ct);
792 /* Handle [file] argument */
794 /* check if specifies command to execute */
795 if (*ci->ci_magic == '|' || *ci->ci_magic == '!') {
796 for (cp = ci->ci_magic + 1; isspace(*cp); cp++)
799 adios(EX_DATAERR, NULL, "empty pipe command for #%s directive", ci->ci_type);
804 /* record filename of decoded contents */
805 ce->ce_file = ci->ci_magic;
806 if (access(ce->ce_file, R_OK) == NOTOK)
807 adios(EX_IOERR, "reading", "unable to access %s for", ce->ce_file);
814 ** No [file] argument, so check profile for
815 ** method to compose content.
817 snprintf(buffer, sizeof(buffer), "%s-compose-%s/%s",
818 invo_name, ci->ci_type, ci->ci_subtype);
819 if ((cp = context_find(buffer)) == NULL || *cp == '\0') {
820 snprintf(buffer, sizeof(buffer), "%s-compose-%s",
821 invo_name, ci->ci_type);
822 if ((cp = context_find(buffer)) == NULL ||
824 content_error(NULL, ct, "don't know how to compose content");
828 ci->ci_magic = getcpy(cp);
834 ** #forw [+folder] [msgs]
836 if (!mh_strcasecmp(ci->ci_type, "forw")) {
838 char *folder, *arguments[MAXARGS];
844 ap = brkstring(ci->ci_magic, " ", "\n");
845 for (i=0; ap[i] && i<MAXARGS-1; i++) {
846 arguments[i] = ap[i];
851 arguments[0] = seq_cur;
856 /* search the arguments for a folder name */
857 for (ap = arguments; *ap; ap++) {
859 if (*cp == '+' || *cp == '@') {
861 adios(EX_USAGE, NULL, "only one folder per #forw directive");
863 folder = getcpy(expandfol(cp));
867 /* else, use the current folder */
869 folder = getcpy(getcurfol());
871 if (!(mp = folder_read(folder)))
872 adios(EX_IOERR, NULL, "unable to read folder %s", folder);
873 for (ap = arguments; *ap; ap++) {
875 if (*cp != '+' && *cp != '@')
876 if (!m_convert(mp, cp))
883 ** If there is more than one message to include, make this
884 ** a content of type "multipart/digest" and insert each message
885 ** as a subpart. If there is only one message, then make this
886 ** a content of type "message/rfc822".
888 if (mp->numsel > 1) {
889 /* we are forwarding multiple messages */
890 if (get_ctinfo("multipart/digest", ct, 0) == NOTOK)
892 ct->c_type = CT_MULTIPART;
893 ct->c_subtype = MULTI_DIGEST;
895 m = (struct multipart *) mh_xcalloc(1, sizeof(*m));
896 ct->c_ctparams = (void *) m;
899 for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
900 if (is_selected(mp, msgnum)) {
905 p = (CT) mh_xcalloc(1, sizeof(*p));
906 init_decoded_content(p);
908 if (get_ctinfo("message/rfc822", p, 0)
911 p->c_type = CT_MESSAGE;
912 p->c_subtype = MESSAGE_RFC822;
914 snprintf(buffer, sizeof(buffer),
915 "%s/%d", mp->foldpath,
917 pe->ce_file = getcpy(buffer);
919 part = (struct part *) mh_xcalloc(1, sizeof(*part));
926 /* we are forwarding one message */
927 if (get_ctinfo("message/rfc822", ct, 0) == NOTOK)
929 ct->c_type = CT_MESSAGE;
930 ct->c_subtype = MESSAGE_RFC822;
933 snprintf(buffer, sizeof(buffer), "%s/%d",
934 mp->foldpath, msgnum);
935 ce->ce_file = getcpy(buffer);
938 folder_free(mp); /* free folder/message structure */
945 if (!mh_strcasecmp(ci->ci_type, "end")) {
952 ** #begin [ alternative | parallel ]
954 if (!mh_strcasecmp(ci->ci_type, "begin")) {
957 cp = SubMultiPart[vrsn - 1].kv_key;
958 } else if (!mh_strcasecmp(ci->ci_magic, "alternative")) {
959 vrsn = MULTI_ALTERNATE;
960 cp = SubMultiPart[vrsn - 1].kv_key;
961 } else if (!mh_strcasecmp(ci->ci_magic, "parallel")) {
962 vrsn = MULTI_PARALLEL;
963 cp = SubMultiPart[vrsn - 1].kv_key;
964 } else if (uprf(ci->ci_magic, "digest")) {
967 vrsn = MULTI_UNKNOWN;
972 snprintf(buffer, sizeof(buffer), "multipart/%s", cp);
973 if (get_ctinfo(buffer, ct, 0) == NOTOK)
975 ct->c_type = CT_MULTIPART;
976 ct->c_subtype = vrsn;
978 m = (struct multipart *) mh_xcalloc(1, sizeof(*m));
979 ct->c_ctparams = (void *) m;
982 while (fgetstr(buffer, sizeof(buffer) - 1, in)) {
986 if (user_content(in, file, buffer, &p) == DONE) {
988 adios(EX_DATAERR, NULL, "empty \"#begin ... #end\" sequence");
994 part = (struct part *) mh_xcalloc(1, sizeof(*part));
999 admonish(NULL, "premature end-of-file, missing #end");
1004 ** Unknown directive
1006 adios(EX_DATAERR, NULL, "unknown directive \"#%s\"", ci->ci_type);
1007 return NOTOK; /* NOT REACHED */
1012 set_id(CT ct, int top)
1016 static time_t clock = 0;
1017 static char *msgfmt;
1021 snprintf(msgid, sizeof(msgid), "<%d.%ld.%%d@%s>\n",
1022 (int) getpid(), (long) clock, LocalName());
1024 msgfmt = getcpy(msgid);
1026 snprintf(msgid, sizeof(msgid), msgfmt, top ? 0 : ++partno);
1027 ct->c_id = getcpy(msgid);
1032 ** Fill out, or expand the various contents in the composition
1033 ** draft. Read-in any necessary files. Parse and execute any
1034 ** commands specified by profile composition strings.
1038 compose_content(CT ct)
1040 CE ce = ct->c_cefile;
1042 switch (ct->c_type) {
1047 char partnam[BUFSIZ];
1048 struct multipart *m = (struct multipart *) ct->c_ctparams;
1052 snprintf(partnam, sizeof(partnam), "%s.",
1054 pp = partnam + strlen(partnam);
1059 /* first, we call compose_content on all the subparts */
1060 for (part = m->mp_parts, partnum = 1; part;
1061 part = part->mp_next, partnum++) {
1062 CT p = part->mp_part;
1064 sprintf(pp, "%d", partnum);
1065 p->c_partno = getcpy(partnam);
1066 if (compose_content(p) == NOTOK)
1073 /* Nothing to do for type message */
1077 ** Discrete types (text/application/audio/image/video)
1082 int xstdout, len, buflen;
1083 char *bp, **ap, *cp;
1084 char *vec[4], buffer[BUFSIZ];
1086 CI ci = &ct->c_ctinfo;
1089 if (!(cp = ci->ci_magic))
1090 adios(EX_SOFTWARE, NULL, "internal error(5)");
1092 tfile = m_mktemp2(NULL, invo_name, NULL, NULL);
1093 if (tfile == NULL) {
1094 adios(EX_CANTCREAT, "mhbuild", "unable to create temporary file");
1096 ce->ce_file = getcpy(tfile);
1101 /* Get buffer ready to go */
1104 buflen = sizeof(buffer);
1107 ** Parse composition string into buffer
1109 for ( ; *cp; cp++) {
1115 ** insert parameters from
1121 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1122 snprintf(bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
1132 /* %f, and stdout is not-redirected */
1138 ** insert temporary filename
1139 ** where content should be
1142 snprintf(bp, buflen, "%s", ce->ce_file);
1146 /* insert content subtype */
1147 strncpy(bp, ci->ci_subtype, buflen);
1151 /* insert character % */
1172 printf("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer);
1174 fflush(stdout); /* not sure if need for -noverbose */
1181 if ((out = fopen(ce->ce_file, "w")) == NULL)
1182 adios(EX_IOERR, ce->ce_file, "unable to open for writing");
1184 switch (child_id = fork()) {
1186 adios(EX_OSERR, "fork", "unable to fork");
1191 dup2(fileno(out), 1);
1193 execvp("/bin/sh", vec);
1194 fprintf(stderr, "unable to exec ");
1201 if (pidXwait(child_id, NULL))
1214 ** Scan the content.
1216 ** 1) choose a transfer encoding.
1217 ** 2) check for clashes with multipart boundary string.
1218 ** 3) for text content, figure out which character set is being used.
1220 ** If there is a clash with one of the contents and the multipart boundary,
1221 ** this function will exit with NOTOK. This will cause the scanning process
1222 ** to be repeated with a different multipart boundary. It is possible
1223 ** (although highly unlikely) that this scan will be repeated multiple times.
1230 int check8bit = 0, contains8bit = 0;
1231 int checklinelen = 0, linelen = 0;
1232 int checkboundary = 0, boundaryclash = 0;
1233 int checklinespace = 0, linespace = 0; /* trailing whitespace */
1234 unsigned char *cp = NULL, buffer[BUFSIZ];
1235 struct text *t = NULL;
1237 CE ce = ct->c_cefile;
1240 ** handle multipart by scanning all subparts
1241 ** and then checking their encoding.
1243 if (ct->c_type == CT_MULTIPART) {
1244 struct multipart *m = (struct multipart *) ct->c_ctparams;
1247 /* initially mark the domain of enclosing multipart as 7bit */
1248 ct->c_encoding = CE_7BIT;
1250 for (part = m->mp_parts; part; part = part->mp_next) {
1251 CT p = part->mp_part;
1253 if (scan_content(p) == NOTOK) {
1254 /* choose encoding for subpart */
1259 ** if necessary, enlarge encoding for enclosing
1262 if (p->c_encoding == CE_BINARY)
1263 ct->c_encoding = CE_BINARY;
1264 if (p->c_encoding == CE_8BIT &&
1265 ct->c_encoding != CE_BINARY)
1266 ct->c_encoding = CE_8BIT;
1273 ** Decide what to check while scanning this content.
1275 switch (ct->c_type) {
1279 if (ct->c_subtype == TEXT_PLAIN) {
1295 case CT_APPLICATION:
1307 ** Scan the unencoded content
1309 if (check8bit || checklinelen || checklinespace || checkboundary) {
1310 if ((in = fopen(ce->ce_file, "r")) == NULL)
1311 adios(EX_IOERR, ce->ce_file, "unable to open for reading");
1312 len = strlen(prefix);
1314 while (fgets(buffer, sizeof(buffer) - 1, in)) {
1316 for (cp = buffer; *cp; cp++) {
1317 if (!isascii(*cp)) {
1319 /* no need to keep checking */
1325 if (checklinelen && (strlen(buffer) > CPERLIN + 1)) {
1327 checklinelen = 0; /* no need to keep checking */
1330 if (checklinespace &&
1331 (cp = buffer + strlen(buffer) - 2) >
1332 buffer && isspace(*cp)) {
1334 /* no need to keep checking */
1339 ** Check if content contains a line that clashes
1340 ** with our standard boundary for multipart messages.
1342 if (checkboundary && buffer[0] == '-' &&
1344 for (cp = buffer + strlen(buffer) - 1;
1349 if (strncmp(buffer + 2, prefix, len)==0 &&
1350 isdigit(buffer[2 + len])) {
1352 /* no need to keep checking */
1361 ** Decide which transfer encoding to use.
1363 switch (ct->c_type) {
1366 ** If the text content didn't specify a character
1367 ** set, we need to figure out which one was used.
1369 t = (struct text *) ct->c_ctparams;
1370 if (t->tx_charset == CHARSET_UNSPECIFIED) {
1371 CI ci = &ct->c_ctinfo;
1374 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++)
1378 t->tx_charset = CHARSET_UNKNOWN;
1379 *ap = concat("charset=", write_charset_8bit(),
1382 t->tx_charset = CHARSET_USASCII;
1383 *ap = getcpy("charset=us-ascii");
1386 cp = strchr(*ap++, '=');
1392 if (contains8bit || linelen || linespace)
1393 ct->c_encoding = CE_QUOTED;
1395 ct->c_encoding = CE_7BIT;
1399 ct->c_encoding = CE_7BIT;
1402 case CT_APPLICATION:
1407 ** Forcing use of base64, because these types likely
1408 ** contain binary data and NUL bytes. Don't care about
1409 ** files that would be clean.
1411 ct->c_encoding = CE_BASE64;
1415 return (boundaryclash ? NOTOK : OK);
1420 ** Scan the content structures, and build header
1421 ** fields that will need to be output into the
1426 build_headers(CT ct)
1430 char *np, *vp, buffer[BUFSIZ];
1431 CI ci = &ct->c_ctinfo;
1434 ** If message is type multipart, then add the multipart
1435 ** boundary to the list of attribute/value pairs.
1437 if (ct->c_type == CT_MULTIPART) {
1439 static int level = 0; /* store nesting level */
1443 snprintf(buffer, sizeof(buffer), "boundary=%s%d",
1445 cp = strchr(*ap++ = getcpy(buffer), '=');
1452 ** output the content type and subtype
1454 np = getcpy(TYPE_FIELD);
1455 vp = concat(" ", ci->ci_type, "/", ci->ci_subtype, NULL);
1457 /* keep track of length of line */
1458 len = strlen(TYPE_FIELD) + strlen(ci->ci_type) +
1459 strlen(ci->ci_subtype) + 3;
1462 ** Append the attribute/value pairs to
1463 ** the end of the Content-Type line.
1465 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1469 snprintf(buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep);
1470 if (len + 1 + (cc = strlen(buffer)) >= CPERLIN) {
1471 vp = add("\n\t", vp);
1477 vp = add(buffer, vp);
1482 ** Append any RFC-822 comment to the end of
1483 ** the Content-Type line.
1485 if (ci->ci_comment) {
1486 snprintf(buffer, sizeof(buffer), "(%s)", ci->ci_comment);
1487 if (len + 1 + (cc = 2 + strlen(ci->ci_comment)) >= CPERLIN) {
1488 vp = add("\n\t", vp);
1494 vp = add(buffer, vp);
1498 add_header(ct, np, vp);
1501 ** output the Content-ID
1504 np = getcpy(ID_FIELD);
1505 vp = concat(" ", ct->c_id, NULL);
1506 add_header(ct, np, vp);
1510 ** output the Content-Description
1513 np = getcpy(DESCR_FIELD);
1514 vp = concat(" ", ct->c_descr, NULL);
1515 if (encode_rfc2047(DESCR_FIELD, &vp, NULL)) {
1516 adios(EX_DATAERR, NULL, "Unable to encode %s header", DESCR_FIELD);
1518 add_header(ct, np, vp);
1522 ** output the Content-Disposition
1525 np = getcpy(DISPO_FIELD);
1526 vp = concat(" ", ct->c_dispo, NULL);
1527 add_header(ct, np, vp);
1531 ** output the Content-Transfer-Encoding
1533 switch (ct->c_encoding) {
1535 /* Nothing to output */
1539 if (ct->c_type == CT_MESSAGE)
1540 adios(EX_DATAERR, NULL, "internal error, invalid encoding");
1542 np = getcpy(ENCODING_FIELD);
1543 vp = concat(" ", "8bit", "\n", NULL);
1544 add_header(ct, np, vp);
1548 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1549 adios(EX_DATAERR, NULL, "internal error, invalid encoding");
1551 np = getcpy(ENCODING_FIELD);
1552 vp = concat(" ", "quoted-printable", "\n", NULL);
1553 add_header(ct, np, vp);
1557 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1558 adios(EX_DATAERR, NULL, "internal error, invalid encoding");
1560 np = getcpy(ENCODING_FIELD);
1561 vp = concat(" ", "base64", "\n", NULL);
1562 add_header(ct, np, vp);
1566 if (ct->c_type == CT_MESSAGE)
1567 adios(EX_DATAERR, NULL, "internal error, invalid encoding");
1569 np = getcpy(ENCODING_FIELD);
1570 vp = concat(" ", "binary", "\n", NULL);
1571 add_header(ct, np, vp);
1575 adios(EX_DATAERR, NULL, "unknown transfer encoding in content");
1580 ** Additional content specific header processing
1582 switch (ct->c_type) {
1585 struct multipart *m;
1588 m = (struct multipart *) ct->c_ctparams;
1589 for (part = m->mp_parts; part; part = part->mp_next) {