attachments.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Handling of attachments.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2013 Steffen "Daode" Nurpmeso <sdaoden@users.sf.net>.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 #include "nail.h"
  41
  42 /* We use calloc() for struct attachment */
  43 CTA(AC_DEFAULT == 0);
  44
  45 /* Fill in some attachment fields; don't be interactive if number==0n */
  46 static struct attachment *      _fill_in(struct attachment *ap,
  47                                         char const *file, ui_it number);
  48
  49 /* Ask the user to edit file names and other data for the given attachment */
  50 static struct attachment *      _read_attachment_data(struct attachment *ap,
  51                                         ui_it number);
  52
  53 /* Try to create temporary charset converted version */
  54 #ifdef HAVE_ICONV
  55 static int                      _attach_iconv(struct attachment *ap);
  56 #endif
  57
  58 static struct attachment *
  59 _fill_in(struct attachment *ap, char const *file, ui_it number)
  60 {
  61         /*
  62          * XXX The "attachment-ask-content-*" variables are left undocumented
  63          * since they are for RFC connoisseurs only.
  64          */
  65         char prefix[80 * 2];
  66
  67         ap->a_name = file;
  68         if ((file = strrchr(file, '/')) != NULL)
  69                 ++file;
  70         else
  71                 file = ap->a_name;
  72
  73         ap->a_content_type = mime_classify_content_type_by_fileext(file);
  74         if (number > 0 && value("attachment-ask-content-type")) {
  75                 snprintf(prefix, sizeof prefix, "#%u\tContent-Type: ", number);
  76                 ap->a_content_type = readstr_input(prefix, ap->a_content_type);
  77         }
  78
  79         if (number > 0 && value("attachment-ask-content-disposition")) {
  80                 snprintf(prefix, sizeof prefix,
  81                         "#%u\tContent-Disposition: ", number);
  82                 ap->a_content_disposition = readstr_input(prefix,
  83                                 ap->a_content_disposition);
  84         }
  85         if (ap->a_content_disposition == NULL)
  86                 ap->a_content_disposition = "attachment";
  87
  88         if (number > 0 && value("attachment-ask-content-id")) {
  89                 snprintf(prefix, sizeof prefix, "#%u\tContent-ID: ", number);
  90                 ap->a_content_id = readstr_input(prefix, ap->a_content_id);
  91         }
  92
  93         if (number > 0 && value("attachment-ask-content-description")) {
  94                 snprintf(prefix, sizeof prefix,
  95                         "#%u\tContent-Description: ", number);
  96                 ap->a_content_description = readstr_input(prefix,
  97                                 ap->a_content_description);
  98         }
  99         return ap;
 100 }
 101
 102 static struct attachment *
 103 _read_attachment_data(struct attachment *ap, ui_it number)
 104 {
 105         char prefix[80 * 2];
 106         char const *cslc = NULL/*cc uninit?*/, *cp, *defcs;
 107
 108         if (ap == NULL)
 109                 ap = csalloc(1, sizeof *ap);
 110         else if (ap->a_msgno) {
 111                 char *ecp = salloc(16);
 112                 snprintf(ecp, 16, "#%u", (ui_it)ap->a_msgno);
 113                 ap->a_msgno = 0;
 114                 ap->a_name = ecp;
 115         } else if (ap->a_conv == AC_TMPFILE) {
 116                 Fclose(ap->a_tmpf);
 117                 ap->a_conv = AC_DEFAULT;
 118         }
 119
 120         snprintf(prefix, sizeof prefix, tr(50, "#%u\tfilename: "), number);
 121         for (;;) {
 122                 if ((ap->a_name = readstr_input(prefix, ap->a_name)) == NULL) {
 123                         ap = NULL;
 124                         goto jleave;
 125                 }
 126                 /* May be a message number */
 127                 if (ap->a_name[0] == '#') {
 128                         char *ecp;
 129                         int msgno = (int)strtol(ap->a_name + 1, &ecp, 10);
 130                         if (msgno > 0 && msgno <= msgCount && *ecp == '\0') {
 131                                 ap->a_msgno = msgno;
 132                                 ap->a_content_description =
 133                                         tr(513, "Attached message content");
 134                                 if (options & OPT_INTERACTIVE)
 135                                         printf(tr(2, "~@: added message #%u\n"),
 136                                                 (ui_it)msgno);
 137                                 goto jleave;
 138                         }
 139                 }
 140                 if ((cp = file_expand(ap->a_name)) != NULL &&
 141                                 access(cp, R_OK) == 0) {
 142                         ap->a_name = cp;
 143                         break;
 144                 }
 145                 perror(cp);
 146         }
 147
 148         ap = _fill_in(ap, cp, number);
 149
 150         /*
 151          * Character set of attachments: enum attach_conv
 152          */
 153         cslc = charset_get_lc();
 154 #ifdef HAVE_ICONV
 155         if (! (options & OPT_INTERACTIVE))
 156                 goto jcs;
 157         if ((cp = ap->a_content_type) != NULL &&
 158                         ascncasecmp(cp, "text/", 5) != 0 &&
 159                         ! yorn(tr(162, "Filename doesn't indicate text "
 160                         "content - want to edit charsets? "))) {
 161                 ap->a_conv = AC_DEFAULT;
 162                 goto jleave;
 163         }
 164
 165         charset_iter_reset(NULL);
 166 jcs:
 167 #endif
 168         snprintf(prefix, sizeof prefix, tr(160, "#%u\tinput charset: "),
 169                 number);
 170         if ((defcs = ap->a_input_charset) == NULL)
 171                 defcs = cslc;
 172         cp = ap->a_input_charset = readstr_input(prefix, defcs);
 173 #ifdef HAVE_ICONV
 174         if (! (options & OPT_INTERACTIVE)) {
 175 #endif
 176                 ap->a_conv = (cp != NULL) ? AC_FIX_INCS : AC_DEFAULT;
 177 #ifdef HAVE_ICONV
 178                 goto jleave;
 179         }
 180
 181         snprintf(prefix, sizeof prefix, tr(161, "#%u\toutput (send) charset: "),
 182                 number);
 183         if ((defcs = ap->a_charset) == NULL)
 184                 defcs = charset_iter_next();
 185         defcs = ap->a_charset = readstr_input(prefix, defcs);
 186
 187         if (cp != NULL && defcs == NULL) {
 188                 ap->a_conv = AC_FIX_INCS;
 189                 goto jdone;
 190         }
 191         if (cp == NULL && defcs == NULL) {
 192                 ap->a_conv = AC_DEFAULT;
 193                 ap->a_input_charset = cslc;
 194                 ap->a_charset = charset_iter_current();
 195         } else if (cp == NULL && defcs != NULL) {
 196                 ap->a_conv = AC_FIX_OUTCS;
 197                 ap->a_input_charset = cslc;
 198         } else
 199                 ap->a_conv = AC_TMPFILE;
 200
 201         printf(tr(197, "Trying conversion from %s to %s\n"),
 202                 ap->a_input_charset, ap->a_charset);
 203         if (_attach_iconv(ap))
 204                 ap->a_conv = AC_TMPFILE;
 205         else {
 206                 ap->a_input_charset = cp;
 207                 ap->a_charset = defcs;
 208                 goto jcs;
 209         }
 210 jdone:
 211 #endif
 212         if (options & OPT_INTERACTIVE)
 213                 printf(tr(19, "~@: added attachment \"%s\"\n"), ap->a_name);
 214 jleave:
 215         return ap;
 216 }
 217
 218 #ifdef HAVE_ICONV
 219 static int
 220 _attach_iconv(struct attachment *ap)
 221 {
 222         struct str oul = {NULL, 0}, inl = {NULL, 0};
 223         FILE *fo = NULL, *fi = NULL;
 224         size_t cnt, lbsize;
 225         iconv_t icp;
 226
 227         if ((icp = n_iconv_open(ap->a_charset, ap->a_input_charset))
 228                         == (iconv_t)-1) {
 229                 if (errno == EINVAL)
 230                         goto jeconv;
 231                 else
 232                         perror("iconv_open");
 233                 goto jerr;
 234         }
 235
 236         if ((fi = Fopen(ap->a_name, "r")) == NULL) {
 237                 perror(ap->a_name);
 238                 goto jerr;
 239         }
 240         cnt = fsize(fi);
 241
 242         inl.s = NULL;
 243         if ((fo = Ftemp(&inl.s, "aiconv", "w+", 0600, 1)) == NULL) {
 244                 perror(tr(51, "temporary mail file"));
 245                 inl.s = NULL;
 246                 goto jerr;
 247         }
 248         unlink(inl.s);
 249         Ftfree(&inl.s);
 250
 251         for (inl.s = NULL, lbsize = 0;;) {
 252                 if (fgetline(&inl.s, &lbsize, &cnt, &inl.l, fi, 0) == NULL) {
 253                         if (! cnt)
 254                                 break;
 255                         perror(tr(195, "I/O read error occurred"));
 256                         goto jerr;
 257                 }
 258
 259                 if (n_iconv_str(icp, &oul, &inl, NULL, FAL0) != 0)
 260                         goto jeconv;
 261                 if ((inl.l=fwrite(oul.s, sizeof *oul.s, oul.l, fo)) != oul.l) {
 262                         perror(tr(196, "I/O write error occurred"));
 263                         goto jerr;
 264                 }
 265         }
 266         fflush_rewind(fo);
 267
 268         ap->a_tmpf = fo;
 269 jleave:
 270         if (inl.s != NULL)
 271                 free(inl.s);
 272         if (oul.s != NULL)
 273                 free(oul.s);
 274         if (fi != NULL)
 275                 Fclose(fi);
 276         if (icp != (iconv_t)-1)
 277                 n_iconv_close(icp);
 278         return (fo != NULL);
 279 jeconv:
 280         fprintf(stderr, tr(179, "Cannot convert from %s to %s\n"),
 281                 ap->a_input_charset, ap->a_charset);
 282 jerr:
 283         if (fo != NULL)
 284                 Fclose(fo);
 285         fo = NULL;
 286         goto jleave;
 287 }
 288 #endif /* HAVE_ICONV */
 289
 290 struct attachment *
 291 add_attachment(struct attachment *aphead, char *file, struct attachment **newap)
 292 {
 293         struct attachment *nap = NULL, *ap;
 294
 295         if ((file = file_expand(file)) == NULL)
 296                 goto jleave;
 297         if (access(file, R_OK) != 0)
 298                 goto jleave;
 299
 300         nap = _fill_in(csalloc(1, sizeof *nap), file, 0);
 301         if (newap != NULL)
 302                 *newap = nap;
 303         if (aphead != NULL) {
 304                 for (ap = aphead; ap->a_flink != NULL; ap = ap->a_flink)
 305                         ;
 306                 ap->a_flink = nap;
 307                 nap->a_blink = ap;
 308         } else {
 309                 nap->a_blink = NULL;
 310                 aphead = nap;
 311         }
 312         nap = aphead;
 313 jleave:
 314         return nap;
 315 }
 316
 317 struct attachment *
 318 append_attachments(struct attachment *aphead, char *names)
 319 {
 320         char *cp;
 321         struct attachment *xaph, *nap;
 322
 323         while ((cp = strcomma(&names, 1)) != NULL) {
 324                 if ((xaph = add_attachment(aphead, cp, &nap)) != NULL) {
 325                         aphead = xaph;
 326                         if (options & OPT_INTERACTIVE)
 327                                 printf(tr(19, "~@: added attachment \"%s\"\n"),
 328                                         nap->a_name);
 329                 } else
 330                         perror(cp);
 331         }
 332         return aphead;
 333 }
 334
 335 struct attachment *
 336 edit_attachments(struct attachment *aphead)
 337 {
 338         struct attachment *ap, *nap;
 339         ui_it attno = 1;
 340
 341         /* Modify already present ones? */
 342         for (ap = aphead; ap != NULL; ap = ap->a_flink) {
 343                 if (_read_attachment_data(ap, attno) != NULL) {
 344                         ++attno;
 345                         continue;
 346                 }
 347                 nap = ap->a_flink;
 348                 if (ap->a_blink != NULL)
 349                         ap->a_blink->a_flink = nap;
 350                 else
 351                         aphead = nap;
 352                 if (nap != NULL)
 353                         nap->a_blink = ap->a_blink;
 354                 else
 355                         goto jleave;
 356         }
 357
 358         /* Add some more? */
 359         while ((nap = _read_attachment_data(NULL, attno)) != NULL) {
 360                 if ((ap = aphead) != NULL) {
 361                         while (ap->a_flink != NULL)
 362                                 ap = ap->a_flink;
 363                         ap->a_flink = nap;
 364                 }
 365                 nap->a_blink = ap;
 366                 nap->a_flink = NULL;
 367                 if (aphead == NULL)
 368                         aphead = nap;
 369                 ++attno;
 370         }
 371 jleave:
 372         return aphead;
 373 }