2 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 2001 Werner Koch (dd9jn)
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 #include "procheader.h"
44 #include "prefs_common.h"
45 #include "passphrase.h"
46 #include "select-keys.h"
47 #include "sigstatus.h"
50 #define DIM(v) (sizeof(v)/sizeof((v)[0]))
52 static char *content_names[] = {
54 "Content-Disposition",
55 "Content-Transfer-Encoding",
59 static char *mime_version_name[] = {
65 struct passphrase_cb_info_s {
70 static char *create_boundary (void);
72 static void dump_mimeinfo (const char *text, MimeInfo *x)
74 g_message ("** MimeInfo[%s] %p level=%d",
75 text, x, x? x->level:0 );
79 g_message ("** enc=`%s' enc_type=%d mime_type=%d",
80 x->encoding, x->encoding_type, x->mime_type );
81 g_message ("** cont_type=`%s' cs=`%s' name=`%s' bnd=`%s'",
82 x->content_type, x->charset, x->name, x->boundary );
83 g_message ("** cont_disp=`%s' fname=`%s' fpos=%ld size=%u, lvl=%d",
84 x->content_disposition, x->filename, x->fpos, x->size,
86 dump_mimeinfo (".main", x->main );
87 dump_mimeinfo (".sub", x->sub );
88 dump_mimeinfo (".next", x->next );
89 g_message ("** MimeInfo[.parent] %p", x );
90 dump_mimeinfo (".children", x->children );
91 dump_mimeinfo (".plaintext", x->plaintext );
94 static void dump_part ( MimeInfo *mimeinfo, FILE *fp )
96 unsigned int size = mimeinfo->size;
99 if (fseek (fp, mimeinfo->fpos, SEEK_SET)) {
100 g_warning ("dump_part: fseek error");
104 g_message ("** --- begin dump_part ----");
105 while (size-- && (c = getc (fp)) != EOF)
108 g_warning ("dump_part: read error");
109 g_message ("** --- end dump_part ----");
113 rfc2015_disable_all (void)
115 /* FIXME: set a flag, so that we don't bother the user with failed
121 rfc2015_secure_remove (const char *fname)
125 /* fixme: overwrite the file first */
131 sig_status_to_string (GpgmeSigStat status)
136 case GPGME_SIG_STAT_NONE:
137 result = _("Oops: Signature not verified");
139 case GPGME_SIG_STAT_NOSIG:
140 result = _("No signature found");
142 case GPGME_SIG_STAT_GOOD:
143 result = _("Good signature");
145 case GPGME_SIG_STAT_BAD:
146 result = _("BAD signature");
148 case GPGME_SIG_STAT_NOKEY:
149 result = _("No public key to verify the signature");
151 case GPGME_SIG_STAT_ERROR:
152 result = _("Error verifying the signature");
154 case GPGME_SIG_STAT_DIFF:
155 result = _("Different results for signatures");
158 result = _("Error: Unknown status");
166 sig_status_with_name (GpgmeSigStat status)
171 case GPGME_SIG_STAT_NONE:
172 result = _("Oops: Signature not verified");
174 case GPGME_SIG_STAT_NOSIG:
175 result = _("No signature found");
177 case GPGME_SIG_STAT_GOOD:
178 result = _("Good signature from \"%s\"");
180 case GPGME_SIG_STAT_BAD:
181 result = _("BAD signature from \"%s\"");
183 case GPGME_SIG_STAT_NOKEY:
184 result = _("No public key to verify the signature");
186 case GPGME_SIG_STAT_ERROR:
187 result = _("Error verifying the signature");
189 case GPGME_SIG_STAT_DIFF:
190 result = _("Different results for signatures");
193 result = _("Error: Unknown status");
201 sig_status_for_key(GString *str, GpgmeCtx ctx, GpgmeSigStat status,
202 GpgmeKey key, const gchar *fpr)
207 uid = gpgme_key_get_string_attr (key, GPGME_ATTR_USERID, NULL, idx);
209 g_string_sprintfa (str, "%s\n",
210 sig_status_to_string (status));
211 if ((fpr != NULL) && (*fpr != '\0'))
212 g_string_sprintfa (str, "Key fingerprint: %s\n", fpr);
213 g_string_append (str, _("Cannot find user ID for this key."));
216 g_string_sprintfa (str, sig_status_with_name (status), uid);
217 g_string_append (str, "\n");
220 uid = gpgme_key_get_string_attr (key, GPGME_ATTR_USERID,
224 g_string_sprintfa (str, _(" aka \"%s\"\n"),
230 sig_status_full (GpgmeCtx ctx)
239 struct tm *ctime_val;
243 str = g_string_new ("");
245 fpr = gpgme_get_sig_status (ctx, sig_idx, &status, &created);
246 while (fpr != NULL) {
248 ctime_val = localtime (&created);
249 strftime (ctime_str, sizeof (ctime_str), "%c",
251 g_string_sprintfa (str,
252 _("Signature made %s\n"),
255 err = gpgme_get_sig_key (ctx, sig_idx, &key);
257 g_string_sprintfa (str, "%s\n",
258 sig_status_to_string (status));
259 if ((fpr != NULL) && (*fpr != '\0'))
260 g_string_sprintfa (str,
261 _("Key fingerprint: %s\n"),
264 sig_status_for_key (str, ctx, status, key, fpr);
265 gpgme_key_unref (key);
267 g_string_append (str, "\n\n");
269 fpr = gpgme_get_sig_status (ctx, ++sig_idx, &status, &created);
273 g_string_free (str, FALSE);
277 static void check_signature (MimeInfo *mimeinfo, MimeInfo *partinfo, FILE *fp)
281 GpgmeData sig = NULL, text = NULL;
282 GpgmeSigStat status = GPGME_SIG_STAT_NONE;
283 GpgmegtkSigStatus statuswindow = NULL;
284 const char *result = NULL;
286 if (prefs_common.gpg_signature_popup)
287 statuswindow = gpgmegtk_sig_status_create ();
289 err = gpgme_new (&ctx);
291 g_warning ("gpgme_new failed: %s", gpgme_strerror (err));
295 /* don't include the last character (LF). It does not belong to the
297 err = gpgme_data_new_from_filepart (&text, NULL, fp,
298 mimeinfo->children->fpos,
299 mimeinfo->children->size ?
300 (mimeinfo->children->size - 1) : 0 );
302 err = gpgme_data_new_from_filepart (&sig, NULL, fp,
303 partinfo->fpos, partinfo->size);
305 g_message ("gpgme_data_new_from_filepart failed: %s",
306 gpgme_strerror (err));
310 err = gpgme_op_verify (ctx, sig, text, &status);
312 g_message ("gpgme_op_verify failed: %s", gpgme_strerror (err));
314 /* FIXME: check what the heck this sig_status_full stuff is.
315 * it should better go into sigstatus.c */
316 g_free (partinfo->sigstatus_full);
317 partinfo->sigstatus_full = sig_status_full (ctx);
320 result = gpgmegtk_sig_status_to_string(status);
321 debug_print("verification status: %s\n", result);
322 if (prefs_common.gpg_signature_popup)
323 gpgmegtk_sig_status_update (statuswindow,ctx);
325 g_assert (!err); /* FIXME: Hey: this may indeed happen */
326 g_free (partinfo->sigstatus);
327 partinfo->sigstatus = g_strdup (result);
329 gpgme_data_release (sig);
330 gpgme_data_release (text);
332 if (prefs_common.gpg_signature_popup)
333 gpgmegtk_sig_status_destroy (statuswindow);
337 passphrase_cb (void *opaque, const char *desc, void *r_hd)
339 struct passphrase_cb_info_s *info = opaque;
340 GpgmeCtx ctx = info ? info->c : NULL;
344 /* FIXME: cleanup by looking at *r_hd */
348 gpgmegtk_set_passphrase_grab (prefs_common.passphrase_grab);
349 g_message ("%% requesting passphrase for `%s': ", desc );
350 pass = gpgmegtk_passphrase_mbox (desc);
352 g_message ("%% cancel passphrase entry");
356 g_message ("%% sending passphrase");
362 * Copy a gpgme data object to a temporary file and
363 * return this filename
366 copy_gpgmedata_to_temp (GpgmeData data, guint *length)
375 tmp = g_strdup_printf("%s%cgpgtmp.%08x",
376 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id );
378 if ((fp = fopen(tmp, "w")) == NULL) {
379 FILE_OP_ERROR(tmp, "fopen");
384 err = gpgme_data_rewind ( data );
386 g_message ("** gpgme_data_rewind failed: %s", gpgme_strerror (err));
388 while (!(err = gpgme_data_read (data, buf, 100, &nread))) {
389 fwrite ( buf, nread, 1, fp );
392 if (err != GPGME_EOF)
393 g_warning ("** gpgme_data_read failed: %s", gpgme_strerror (err));
402 pgp_decrypt (MimeInfo *partinfo, FILE *fp)
406 GpgmeData cipher = NULL, plain = NULL;
407 struct passphrase_cb_info_s info;
409 memset (&info, 0, sizeof info);
411 err = gpgme_new (&ctx);
413 g_message ("gpgme_new failed: %s", gpgme_strerror (err));
417 err = gpgme_data_new_from_filepart (&cipher, NULL, fp,
418 partinfo->fpos, partinfo->size);
420 g_message ("gpgme_data_new_from_filepart failed: %s",
421 gpgme_strerror (err));
425 err = gpgme_data_new (&plain);
427 g_message ("gpgme_new failed: %s", gpgme_strerror (err));
431 if (!getenv("GPG_AGENT_INFO")) {
433 gpgme_set_passphrase_cb (ctx, passphrase_cb, &info);
436 err = gpgme_op_decrypt (ctx, cipher, plain);
439 gpgme_data_release (cipher);
441 g_warning ("** decryption failed: %s", gpgme_strerror (err));
442 gpgme_data_release (plain);
446 g_message ("** decryption succeeded");
452 MimeInfo * rfc2015_find_signature (MimeInfo *mimeinfo)
459 if (g_strcasecmp (mimeinfo->content_type, "multipart/signed"))
462 g_message ("** multipart/signed encountered");
464 /* check that we have at least 2 parts of the correct type */
465 for (partinfo = mimeinfo->children;
466 partinfo != NULL; partinfo = partinfo->next) {
467 if (++n > 1 && !g_strcasecmp (partinfo->content_type,
468 "application/pgp-signature"))
475 gboolean rfc2015_has_signature (MimeInfo *mimeinfo)
477 return rfc2015_find_signature (mimeinfo) != NULL;
480 void rfc2015_check_signature (MimeInfo *mimeinfo, FILE *fp)
484 partinfo = rfc2015_find_signature (mimeinfo);
489 g_message ("** yep, it is a pgp signature");
490 dump_mimeinfo ("gpg-signature", partinfo );
491 dump_part (partinfo, fp );
492 dump_mimeinfo ("signed text", mimeinfo->children );
493 dump_part (mimeinfo->children, fp);
496 check_signature (mimeinfo, partinfo, fp);
499 int rfc2015_is_encrypted (MimeInfo *mimeinfo)
503 if (strcasecmp (mimeinfo->content_type, "multipart/encrypted"))
505 /* fixme: we should schek the protocol parameter */
510 name_cmp(const char *a, const char *b)
512 for( ; *a && *b; a++, b++) {
514 && toupper(*(unsigned char *)a) != toupper(*(unsigned char *)b))
522 headerp(char *p, char **names)
531 if(p2[-1] == ' ' || p2[-1] == '\t') {
540 for(i = 0 ; names[i] != NULL; i++) {
541 if(!name_cmp (names[i], p))
546 return names[i] != NULL;
550 void rfc2015_decrypt_message (MsgInfo *msginfo, MimeInfo *mimeinfo, FILE *fp)
563 g_return_if_fail (mimeinfo->mime_type == MIME_MULTIPART);
565 g_message ("** multipart/encrypted encountered");
568 if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0)
570 while (fgets(buf, sizeof(buf), fp) != NULL)
571 if (buf[0] == '\r' || buf[0] == '\n') break;
573 procmime_scan_multipart_message(mimeinfo, fp);
575 /* check that we have the 2 parts */
577 for (partinfo = mimeinfo->children; partinfo; partinfo = partinfo->next) {
578 if (++n == 1 && !strcmp (partinfo->content_type,
579 "application/pgp-encrypted")) {
580 /* Fixme: check that the version is 1 */
583 else if (n == 2 && !strcmp (partinfo->content_type,
584 "application/octet-stream")) {
586 g_warning ("** oops: pgp_encrypted with more than 2 parts");
591 if (!ver_okay || !partinfo) {
592 msginfo->decryption_failed = 1;
593 /* fixme: remove the stuff, that the above procmime_scan_multiparts()
594 * has appended to mimeino */
598 g_message ("** yep, it is pgp encrypted");
600 plain = pgp_decrypt (partinfo, fp);
602 msginfo->decryption_failed = 1;
606 fname = g_strdup_printf("%s%cplaintext.%08x",
607 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
609 if ((dstfp = fopen(fname, "w")) == NULL) {
610 FILE_OP_ERROR(fname, "fopen");
612 msginfo->decryption_failed = 1;
616 /* write the orginal header to the new file */
617 if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0)
620 while (fgets(buf, sizeof(buf), fp)) {
621 if (headerp (buf, content_names))
623 if (buf[0] == '\r' || buf[0] == '\n')
628 err = gpgme_data_rewind (plain);
630 g_message ("** gpgme_data_rewind failed: %s", gpgme_strerror (err));
632 while (!(err = gpgme_data_read (plain, buf, sizeof(buf), &nread))) {
633 fwrite (buf, nread, 1, dstfp);
636 if (err != GPGME_EOF) {
637 g_warning ("** gpgme_data_read failed: %s", gpgme_strerror (err));
642 msginfo->plaintext_file = fname;
643 msginfo->decryption_failed = 0;
648 * plain contains an entire mime object.
649 * Encrypt it and return an GpgmeData object with the encrypted version of
650 * the file or NULL in case of error.
653 pgp_encrypt ( GpgmeData plain, GpgmeRecipients rset )
657 GpgmeData cipher = NULL;
659 err = gpgme_new (&ctx);
661 err = gpgme_data_new (&cipher);
663 gpgme_set_armor (ctx, 1);
664 err = gpgme_op_encrypt (ctx, rset, plain, cipher);
668 g_warning ("** encryption failed: %s", gpgme_strerror (err));
669 gpgme_data_release (cipher);
673 g_message ("** encryption succeeded");
682 * Encrypt the file by extracting all recipients and finding the
683 * encryption keys for all of them. The file content is then replaced
684 * by the encrypted one. */
686 rfc2015_encrypt (const char *file, GSList *recp_list)
690 int i, clineidx, saved_last;
691 char *clines[3] = {NULL};
693 GpgmeData header = NULL;
694 GpgmeData plain = NULL;
695 GpgmeData cipher = NULL;
696 GpgmeRecipients rset = NULL;
698 int mime_version_seen = 0;
699 char *boundary = create_boundary ();
701 /* Create the list of recipients */
702 rset = gpgmegtk_recipient_selection (recp_list);
704 g_warning ("error creating recipient list" );
708 /* Open the source file */
709 if ((fp = fopen(file, "rb")) == NULL) {
710 FILE_OP_ERROR(file, "fopen");
714 err = gpgme_data_new (&header);
716 err = gpgme_data_new (&plain);
718 g_message ("gpgme_data_new failed: %s", gpgme_strerror (err));
722 /* get the content header lines from the source */
725 while (!err && fgets(buf, sizeof(buf), fp)) {
726 /* fixme: check for overlong lines */
727 if (headerp (buf, content_names)) {
728 if (clineidx >= DIM (clines)) {
729 g_message ("rfc2015_encrypt: too many content lines");
732 clines[clineidx++] = g_strdup (buf);
738 if (*buf == ' ' || *buf == '\t') {
739 char *last = clines[clineidx-1];
740 clines[clineidx-1] = g_strconcat (last, buf, NULL);
746 if (headerp (buf, mime_version_name))
747 mime_version_seen = 1;
749 if (buf[0] == '\r' || buf[0] == '\n')
751 err = gpgme_data_write (header, buf, strlen (buf));
754 FILE_OP_ERROR (file, "fgets");
758 /* write them to the temp data and add the rest of the message */
759 for (i = 0; !err && i < clineidx; i++) {
760 g_message ("%% %s:%d: cline=`%s'", __FILE__ ,__LINE__, clines[i]);
761 err = gpgme_data_write (plain, clines[i], strlen (clines[i]));
764 err = gpgme_data_write (plain, "\r\n", 2);
765 while (!err && fgets(buf, sizeof(buf), fp)) {
766 err = gpgme_data_write (plain, buf, strlen (buf));
769 FILE_OP_ERROR (file, "fgets");
773 g_warning ("** gpgme_data_write failed: %s", gpgme_strerror (err));
777 cipher = pgp_encrypt (plain, rset);
778 gpgme_data_release (plain); plain = NULL;
779 gpgme_recipients_release (rset); rset = NULL;
783 /* we have the encrypted message available in cipher and now we
784 * are going to rewrite the source file. To be sure that file has
785 * been truncated we use an approach which should work everywhere:
786 * close the file and then reopen it for writing. It is important
787 * that this works, otherwise it may happen that parts of the
788 * plaintext are still in the file (The encrypted stuff is, due to
789 * compression, usually shorter than the plaintext).
791 * Yes, there is a race condition here, but everyone, who is so
792 * stupid to store the temp file with the plaintext in a public
793 * directory has to live with this anyway. */
795 FILE_OP_ERROR(file, "fclose");
798 if ((fp = fopen(file, "wb")) == NULL) {
799 FILE_OP_ERROR(file, "fopen");
803 /* Write the header, append new content lines, part 1 and part 2 header */
804 err = gpgme_data_rewind (header);
806 g_message ("gpgme_data_rewind failed: %s", gpgme_strerror (err));
809 while (!(err = gpgme_data_read (header, buf, BUFFSIZE, &nread))) {
810 fwrite (buf, nread, 1, fp);
812 if (err != GPGME_EOF) {
813 g_warning ("** gpgme_data_read failed: %s", gpgme_strerror (err));
817 FILE_OP_ERROR (file, "fwrite");
820 gpgme_data_release (header); header = NULL;
822 if (!mime_version_seen)
823 fputs ("MIME-Version: 1\r\n", fp);
826 "Content-Type: multipart/encrypted;"
827 " protocol=\"application/pgp-encrypted\";\r\n"
828 " boundary=\"%s\"\r\n"
831 "Content-Type: application/pgp-encrypted\r\n"
836 "Content-Type: application/octet-stream\r\n"
838 boundary, boundary, boundary);
840 /* append the encrypted stuff */
841 err = gpgme_data_rewind (cipher);
843 g_warning ("** gpgme_data_rewind on cipher failed: %s",
844 gpgme_strerror (err));
848 while (!(err = gpgme_data_read (cipher, buf, BUFFSIZE, &nread))) {
849 fwrite (buf, nread, 1, fp);
851 if (err != GPGME_EOF) {
852 g_warning ("** gpgme_data_read failed: %s", gpgme_strerror (err));
856 /* and the final boundary */
864 FILE_OP_ERROR (file, "fwrite");
868 gpgme_data_release (cipher);
874 gpgme_data_release (header);
875 gpgme_data_release (plain);
876 gpgme_data_release (cipher);
877 gpgme_recipients_release (rset);
879 return -1; /* error */
883 set_signers (GpgmeCtx ctx, PrefsAccount *ac)
885 GSList *key_list = NULL;
886 GpgmeCtx list_ctx = NULL;
887 const char *keyid = NULL;
895 switch (ac->sign_key) {
896 case SIGN_KEY_DEFAULT:
897 return 0; /* nothing to do */
899 case SIGN_KEY_BY_FROM:
903 case SIGN_KEY_CUSTOM:
904 keyid = ac->sign_key_id;
908 g_assert_not_reached ();
911 err = gpgme_new (&list_ctx);
914 err = gpgme_op_keylist_start (list_ctx, keyid, 1);
917 while ( !(err = gpgme_op_keylist_next (list_ctx, &key)) ) {
918 key_list = g_slist_append (key_list, key);
920 if (err != GPGME_EOF)
922 if (key_list == NULL) {
923 g_warning ("no keys found for keyid \"%s\"", keyid);
925 gpgme_signers_clear (ctx);
926 for (p = key_list; p != NULL; p = p->next) {
927 err = gpgme_signers_add (ctx, (GpgmeKey) p->data);
934 g_message ("** set_signers failed: %s", gpgme_strerror (err));
935 for (p = key_list; p != NULL; p = p->next)
936 gpgme_key_unref ((GpgmeKey) p->data);
937 g_slist_free (key_list);
939 gpgme_release (list_ctx);
944 * plain contains an entire mime object. Sign it and return an
945 * GpgmeData object with the signature of it or NULL in case of error.
948 pgp_sign (GpgmeData plain, PrefsAccount *ac)
952 GpgmeData sig = NULL;
953 struct passphrase_cb_info_s info;
955 memset (&info, 0, sizeof info);
957 err = gpgme_new (&ctx);
960 err = gpgme_data_new (&sig);
964 if (!getenv("GPG_AGENT_INFO")) {
966 gpgme_set_passphrase_cb (ctx, passphrase_cb, &info);
968 gpgme_set_textmode (ctx, 1);
969 gpgme_set_armor (ctx, 1);
970 err = set_signers (ctx, ac);
973 err = gpgme_op_sign (ctx, plain, sig, GPGME_SIG_MODE_DETACH);
977 g_message ("** signing failed: %s", gpgme_strerror (err));
978 gpgme_data_release (sig);
982 g_message ("** signing succeeded");
990 * Sign the file and replace its content with the signed one.
993 rfc2015_sign (const char *file, PrefsAccount *ac)
997 int i, clineidx, saved_last;
998 char *clines[3] = {NULL};
1000 GpgmeData header = NULL;
1001 GpgmeData plain = NULL;
1002 GpgmeData sigdata = NULL;
1004 int mime_version_seen = 0;
1005 char *boundary = create_boundary ();
1007 /* Open the source file */
1008 if ((fp = fopen(file, "rb")) == NULL) {
1009 FILE_OP_ERROR(file, "fopen");
1013 err = gpgme_data_new (&header);
1015 err = gpgme_data_new (&plain);
1017 g_message ("gpgme_data_new failed: %s", gpgme_strerror (err));
1021 /* get the content header lines from the source */
1024 while (!err && fgets(buf, sizeof(buf), fp)) {
1025 /* fixme: check for overlong lines */
1026 if (headerp (buf, content_names)) {
1027 if (clineidx >= DIM (clines)) {
1028 g_message ("rfc2015_sign: too many content lines");
1031 clines[clineidx++] = g_strdup (buf);
1037 if (*buf == ' ' || *buf == '\t') {
1038 char *last = clines[clineidx - 1];
1039 clines[clineidx - 1] = g_strconcat (last, buf, NULL);
1045 if (headerp (buf, mime_version_name))
1046 mime_version_seen = 1;
1048 if (buf[0] == '\r' || buf[0] == '\n')
1050 err = gpgme_data_write (header, buf, strlen (buf));
1053 FILE_OP_ERROR (file, "fgets");
1057 /* write them to the temp data and add the rest of the message */
1058 for (i = 0; !err && i < clineidx; i++) {
1059 err = gpgme_data_write (plain, clines[i], strlen (clines[i]));
1062 err = gpgme_data_write (plain, "\r\n", 2 );
1063 while (!err && fgets(buf, sizeof(buf), fp)) {
1064 err = gpgme_data_write (plain, buf, strlen (buf));
1067 FILE_OP_ERROR (file, "fgets");
1071 g_message ("** gpgme_data_write failed: %s", gpgme_strerror (err));
1075 sigdata = pgp_sign (plain, ac);
1079 /* we have the signed message available in sigdata and now we are
1080 * going to rewrite the original file. To be sure that file has
1081 * been truncated we use an approach which should work everywhere:
1082 * close the file and then reopen it for writing. */
1084 FILE_OP_ERROR(file, "fclose");
1087 if ((fp = fopen(file, "wb")) == NULL) {
1088 FILE_OP_ERROR(file, "fopen");
1092 /* Write the rfc822 header and add new content lines */
1093 err = gpgme_data_rewind (header);
1095 g_message ("** gpgme_data_rewind failed: %s", gpgme_strerror (err));
1096 while (!(err = gpgme_data_read (header, buf, BUFFSIZE, &nread))) {
1097 fwrite (buf, nread, 1, fp);
1099 if (err != GPGME_EOF) {
1100 g_message ("** gpgme_data_read failed: %s", gpgme_strerror (err));
1104 FILE_OP_ERROR (file, "fwrite");
1107 gpgme_data_release (header);
1110 if (!mime_version_seen)
1111 fputs ("MIME-Version: 1\r\n", fp);
1112 fprintf (fp, "Content-Type: multipart/signed; "
1113 "protocol=\"application/pgp-signature\";\r\n"
1114 " boundary=\"%s\"\r\n", boundary );
1116 /* Part 1: signed material */
1117 fprintf (fp, "\r\n--%s\r\n", boundary);
1118 err = gpgme_data_rewind (plain);
1120 g_message ("** gpgme_data_rewind on plain failed: %s",
1121 gpgme_strerror (err));
1124 while (!(err = gpgme_data_read (plain, buf, BUFFSIZE, &nread))) {
1125 fwrite (buf, nread, 1, fp);
1127 if (err != GPGME_EOF) {
1128 g_message ("** gpgme_data_read failed: %s", gpgme_strerror (err));
1132 /* Part 2: signature */
1133 fprintf (fp, "\r\n--%s\r\n", boundary);
1134 fputs ("Content-Type: application/pgp-signature\r\n"
1137 err = gpgme_data_rewind (sigdata);
1139 g_message ("** gpgme_data_rewind on sigdata failed: %s",
1140 gpgme_strerror (err));
1144 while (!(err = gpgme_data_read (sigdata, buf, BUFFSIZE, &nread))) {
1145 fwrite (buf, nread, 1, fp);
1147 if (err != GPGME_EOF) {
1148 g_message ("** gpgme_data_read failed: %s", gpgme_strerror (err));
1152 /* Final boundary */
1153 fprintf (fp, "\r\n--%s--\r\n\r\n", boundary);
1156 FILE_OP_ERROR (file, "fwrite");
1160 gpgme_data_release (header);
1161 gpgme_data_release (plain);
1162 gpgme_data_release (sigdata);
1169 gpgme_data_release (header);
1170 gpgme_data_release (plain);
1171 gpgme_data_release (sigdata);
1173 return -1; /* error */
1178 * Create a new boundary in a way that it is very unlikely that this
1179 * will occur in the following text. It would be easy to ensure
1180 * uniqueness if everything is either quoted-printable or base64
1181 * encoded (note that conversion is allowed), but because MIME bodies
1182 * may be nested, it may happen that the same boundary has already
1183 * been used. We avoid scanning the message for conflicts and hope the
1186 * boundary := 0*69<bchars> bcharsnospace
1187 * bchars := bcharsnospace / " "
1188 * bcharsnospace := DIGIT / ALPHA / "'" / "(" / ")" /
1189 * "+" / "_" / "," / "-" / "." /
1190 * "/" / ":" / "=" / "?"
1194 create_boundary (void)
1196 static char tbl[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1197 "abcdefghijklmnopqrstuvwxyz"
1198 "1234567890'()+_,./:=?";
1205 /* We make the boundary depend on the pid, so that all running
1206 * processed generate different values even when they have been
1207 * started within the same second and srand48(time(NULL)) has been
1208 * used. I can't see whether this is really an advantage but it
1209 * doesn't do any harm.
1212 for(i = 0; i < sizeof(buf) - 1; i++) {
1213 buf[i] = tbl[(lrand48() ^ pid) % (sizeof(tbl) - 1)]; /* fill with random */
1214 if(buf[i] == '=' && equal == -1)
1219 /* now make sure that we do have the sequence "=." in it which cannot
1220 * be matched by quoted-printable or base64 encoding */
1221 if(equal != -1 && (equal+1) < i)
1228 return g_strdup(buf);
1231 #endif /* USE_GPGME */