diplodocus.org Git - nmh/blob - uip/replsbr.c

   1
   2 /*
   3  * replsbr.c -- routines to help repl along...
   4  *
   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.
   8  */
   9
  10 #include <h/mh.h>
  11 #include <h/addrsbr.h>
  12 #include <h/fmt_scan.h>
  13 #include <h/utils.h>
  14 #include <sys/file.h>           /* L_SET */
  15
  16 extern short ccto;              /* from repl.c */
  17 extern short cccc;
  18 extern short ccme;
  19 extern short querysw;
  20
  21 static int dftype=0;
  22
  23 static char *badaddrs = NULL;
  24 static char *dfhost = NULL;
  25
  26 static struct mailname mq;
  27 static int nodupcheck = 0;              /* If set, no check for duplicates */
  28
  29 /*
  30  * Buffer size for content part of header fields.
  31  * We want this to be large enough so that we don't
  32  * do a lot of extra FLDPLUS calls on m_getfld but
  33  * small enough so that we don't snarf the entire
  34  * message body when we're not going to use any of it.
  35  */
  36 #define SBUFSIZ 256
  37
  38 static char *addrcomps[] = {
  39     "from",
  40     "sender",
  41     "reply-to",
  42     "to",
  43     "cc",
  44     "bcc",
  45     "resent-from",
  46     "resent-sender",
  47     "resent-reply-to",
  48     "resent-to",
  49     "resent-cc",
  50     "resent-bcc",
  51     NULL
  52 };
  53
  54 /*
  55  * static prototypes
  56  */
  57 static int insert (struct mailname *);
  58 static void replfilter (FILE *, FILE *, char *, int);
  59 static char *replformataddr(char *, char *);
  60 static char *replconcataddr(char *, char *);
  61 static char *fix_addresses (char *);
  62
  63
  64 void
  65 replout (FILE *inb, char *msg, char *drft, struct msgs *mp, int outputlinelen,
  66         int mime, char *form, char *filter, char *fcc, int fmtproc)
  67 {
  68     int state, i;
  69     struct comp *cptr;
  70     char tmpbuf[SBUFSIZ];
  71     struct format *fmt;
  72     char **ap;
  73     int char_read = 0, format_len, mask;
  74     char name[NAMESZ], *cp;
  75     charstring_t scanl;
  76     static int dat[5];                  /* aux. data for format routine */
  77     m_getfld_state_t gstate = 0;
  78     struct fmt_callbacks cb;
  79
  80     FILE *out;
  81     NMH_UNUSED (msg);
  82
  83     mask = umask(~m_gmprot());
  84     if ((out = fopen (drft, "w")) == NULL)
  85         adios (drft, "unable to create");
  86
  87     umask(mask);
  88
  89     /* get new format string */
  90     cp = new_fs (form, NULL, NULL);
  91     format_len = strlen (cp);
  92
  93     /* compile format string */
  94     fmt_compile (cp, &fmt, 1);
  95
  96     for (ap = addrcomps; *ap; ap++) {
  97         cptr = fmt_findcomp (*ap);
  98         if (cptr)
  99             cptr->c_type |= CT_ADDR;
 100     }
 101
 102     /*
 103      * ignore any components killed by command line switches
 104      *
 105      * This prevents the component from being found via fmt_findcomp(),
 106      * which makes sure no text gets added to it when the message is processed.
 107      */
 108     if (!ccto) {
 109         cptr = fmt_findcomp ("to");
 110         if (cptr)
 111             cptr->c_name = mh_xstrdup("");
 112     }
 113     if (!cccc) {
 114          cptr = fmt_findcomp("cc");
 115         if (cptr)
 116             cptr->c_name = mh_xstrdup("");
 117     }
 118     /* set up the "fcc" pseudo-component */
 119     if (fcc) {
 120         cptr = fmt_findcomp ("fcc");
 121         if (cptr)
 122             cptr->c_text = mh_xstrdup(fcc);
 123     }
 124     if ((cp = getenv("USER"))) {
 125         cptr = fmt_findcomp ("user");
 126         if (cptr)
 127             cptr->c_text = mh_xstrdup(cp);
 128     }
 129     if (!ccme)
 130         ismymbox (NULL);
 131
 132     /*
 133      * pick any interesting stuff out of msg "inb"
 134      */
 135     for (;;) {
 136         int msg_count = sizeof tmpbuf;
 137         state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 138         switch (state) {
 139             case FLD:
 140             case FLDPLUS:
 141                 /*
 142                  * if we're interested in this component, save a pointer
 143                  * to the component text, then start using our next free
 144                  * buffer as the component temp buffer (buffer switching
 145                  * saves an extra copy of the component text).
 146                  */
 147
 148                 i = fmt_addcomptext(name, tmpbuf);
 149                 if (i != -1) {
 150                     char_read += msg_count;
 151                     while (state == FLDPLUS) {
 152                         msg_count= sizeof tmpbuf;
 153                         state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 154                         fmt_appendcomp(i, name, tmpbuf);
 155                         char_read += msg_count;
 156                     }
 157                 }
 158
 159                 while (state == FLDPLUS) {
 160                     msg_count= sizeof tmpbuf;
 161                     state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 162                 }
 163                 break;
 164
 165             case LENERR:
 166             case FMTERR:
 167             case BODY:
 168             case FILEEOF:
 169                 goto finished;
 170
 171             default:
 172                 adios (NULL, "m_getfld() returned %d", state);
 173         }
 174     }
 175
 176     /*
 177      * format and output the header lines.
 178      */
 179 finished:
 180     m_getfld_state_destroy (&gstate);
 181
 182     /*
 183      * if there's a "Subject" component, strip any "Re:"s off it
 184      */
 185     cptr = fmt_findcomp ("subject");
 186     if (cptr && (cp = cptr->c_text)) {
 187         char *sp = cp;
 188
 189         for (;;) {
 190             while (isspace((unsigned char) *cp))
 191                 cp++;
 192             if(uprf(cp, "re:"))
 193                 cp += 3;
 194             else
 195                 break;
 196             sp = cp;
 197         }
 198         if (sp != cptr->c_text) {
 199             cp = cptr->c_text;
 200             cptr->c_text = mh_xstrdup(sp);
 201             free (cp);
 202         }
 203     }
 204     i = format_len + char_read + 256;
 205     scanl = charstring_create (i + 2);
 206     dat[0] = 0;
 207     dat[1] = 0;
 208     dat[2] = 0;
 209     dat[3] = outputlinelen;
 210     dat[4] = 0;
 211     memset(&cb, 0, sizeof(cb));
 212     cb.formataddr = replformataddr;
 213     cb.concataddr = replconcataddr;
 214     fmt_scan (fmt, scanl, i, dat, &cb);
 215     fputs (charstring_buffer (scanl), out);
 216     if (badaddrs) {
 217         fputs ("\nrepl: bad addresses:\n", out);
 218         fputs ( badaddrs, out);
 219     }
 220
 221     /*
 222      * Check if we should filter the message
 223      * or add mhn directives
 224      */
 225     if (filter) {
 226         fflush(out);
 227         if (ferror (out))
 228             adios (drft, "error writing");
 229
 230         replfilter (inb, out, filter, fmtproc);
 231     } else if (mime && mp) {
 232             fprintf (out, "#forw [original message] +%s %s\n",
 233                      mp->foldpath, m_name (mp->lowsel));
 234     }
 235
 236     fflush(out);
 237     if (ferror (out))
 238         adios (drft, "error writing");
 239     fclose (out);
 240
 241     /* return dynamically allocated buffers */
 242     charstring_free (scanl);
 243     fmt_free(fmt, 1);
 244 }
 245
 246 static char *buf;               /* our current working buffer */
 247 static char *bufend;            /* end of working buffer */
 248 static char *last_dst;          /* buf ptr at end of last call */
 249 static unsigned int bufsiz=0;   /* current size of buf */
 250
 251 #define BUFINCR 512             /* how much to expand buf when if fills */
 252
 253 #define CPY(s) { cp = (s); while ((*dst++ = *cp++)) ; --dst; }
 254
 255 /*
 256  * check if there's enough room in buf for str.
 257  * add more mem if needed
 258  */
 259 #define CHECKMEM(str) \
 260             if ((len = strlen (str)) >= bufend - dst) {\
 261                 int i = dst - buf;\
 262                 int n = last_dst - buf;\
 263                 bufsiz += ((dst + len - bufend) / BUFINCR + 1) * BUFINCR;\
 264                 buf = mh_xrealloc (buf, bufsiz);\
 265                 dst = buf + i;\
 266                 last_dst = buf + n;\
 267                 bufend = buf + bufsiz;\
 268             }
 269
 270
 271 /*
 272  * fmt_scan will call this routine if the user includes the function
 273  * "(formataddr {component})" in a format string.  "orig" is the
 274  * original contents of the string register.  "str" is the address
 275  * string to be formatted and concatenated onto orig.  This routine
 276  * returns a pointer to the concatenated address string.
 277  *
 278  * We try to not do a lot of malloc/copy/free's (which is why we
 279  * don't call "getcpy") but still place no upper limit on the
 280  * length of the result string.
 281  */
 282 static char *
 283 replformataddr (char *orig, char *str)
 284 {
 285     int len;
 286     char baddr[BUFSIZ], error[BUFSIZ];
 287     int isgroup;
 288     char *dst;
 289     char *cp;
 290     char *sp;
 291     struct mailname *mp = NULL;
 292     char *fixed_str = fix_addresses (str);
 293
 294     /* if we don't have a buffer yet, get one */
 295     if (bufsiz == 0) {
 296         buf = mh_xmalloc (BUFINCR);
 297         last_dst = buf;         /* XXX */
 298         bufsiz = BUFINCR - 6;  /* leave some slop */
 299         bufend = buf + bufsiz;
 300     }
 301     /*
 302      * If "orig" points to our buffer we can just pick up where we
 303      * left off.  Otherwise we have to copy orig into our buffer.
 304      */
 305     if (orig == buf)
 306         dst = last_dst;
 307     else if (!orig || !*orig) {
 308         dst = buf;
 309         *dst = '\0';
 310     } else {
 311         dst = last_dst;         /* XXX */
 312         CHECKMEM (orig);
 313         CPY (orig);
 314     }
 315
 316     /* concatenate all the new addresses onto 'buf' */
 317     for (isgroup = 0; (cp = getname (fixed_str)); ) {
 318         if ((mp = getm (cp, dfhost, dftype, error, sizeof(error))) == NULL) {
 319             snprintf (baddr, sizeof(baddr), "\t%s -- %s\n", cp, error);
 320             badaddrs = add (baddr, badaddrs);
 321             continue;
 322         }
 323         if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
 324             *dst++ = ';';
 325             isgroup = 0;
 326         }
 327         if (insert (mp)) {
 328             /* if we get here we're going to add an address */
 329             if (dst != buf) {
 330                 *dst++ = ',';
 331                 *dst++ = ' ';
 332             }
 333             if (mp->m_gname) {
 334                 CHECKMEM (mp->m_gname);
 335                 CPY (mp->m_gname);
 336                 isgroup++;
 337             }
 338             sp = adrformat (mp);
 339             CHECKMEM (sp);
 340             CPY (sp);
 341         }
 342     }
 343
 344     free (fixed_str);
 345
 346     if (isgroup)
 347         *dst++ = ';';
 348
 349     *dst = '\0';
 350     last_dst = dst;
 351     return (buf);
 352 }
 353
 354
 355 /*
 356  * fmt_scan will call this routine if the user includes the function
 357  * "(concataddr {component})" in a format string.  This behaves exactly
 358  * like formataddr, except that it does NOT suppress duplicate addresses
 359  * between calls.
 360  *
 361  * As an implementation detail: I thought about splitting out replformataddr()
 362  * into the generic part and duplicate-suppressing part, but the call to
 363  * insert() was buried deep within a couple of loops and I didn't see a
 364  * way to do it easily.  So instead we simply set a special flag to stop
 365  * the duplicate check and call replformataddr().
 366  */
 367 static char *
 368 replconcataddr(char *orig, char *str)
 369 {
 370     char *cp;
 371
 372     nodupcheck = 1;
 373     cp = replformataddr(orig, str);
 374     nodupcheck = 0;
 375     return cp;
 376 }
 377
 378 static int
 379 insert (struct mailname *np)
 380 {
 381     char buffer[BUFSIZ];
 382     struct mailname *mp;
 383
 384     if (nodupcheck)
 385         return 1;
 386
 387     if (np->m_mbox == NULL)
 388         return 0;
 389
 390     for (mp = &mq; mp->m_next; mp = mp->m_next) {
 391         if (!strcasecmp (np->m_host ? np->m_host : "",
 392                          mp->m_next->m_host ? mp->m_next->m_host : "")  &&
 393             !strcasecmp (np->m_mbox ? np->m_mbox : "",
 394                          mp->m_next->m_mbox ? mp->m_next->m_mbox : ""))
 395             return 0;
 396     }
 397     if (!ccme && ismymbox (np))
 398         return 0;
 399
 400     if (querysw) {
 401         snprintf (buffer, sizeof(buffer), "Reply to %s? ", adrformat (np));
 402         if (!read_switch (buffer, anoyes))
 403         return 0;
 404     }
 405     mp->m_next = np;
 406
 407     return 1;
 408 }
 409
 410
 411 /*
 412  * Call the mhlproc
 413  *
 414  * This function expects that argument out has been fflushed by the caller.
 415  */
 416
 417 static void
 418 replfilter (FILE *in, FILE *out, char *filter, int fmtproc)
 419 {
 420     int pid;
 421     char *mhl;
 422     char *errstr;
 423     char **arglist;
 424     int argnum;
 425
 426     if (filter == NULL)
 427         return;
 428
 429     if (access (filter, R_OK) == NOTOK)
 430         adios (filter, "unable to read");
 431
 432     rewind (in);
 433     lseek (fileno(in), (off_t) 0, SEEK_SET);
 434
 435     arglist = argsplit(mhlproc, &mhl, &argnum);
 436
 437     switch (pid = fork()) {
 438         case NOTOK:
 439             adios ("fork", "unable to");
 440
 441         case OK:
 442             dup2 (fileno (in), fileno (stdin));
 443             dup2 (fileno (out), fileno (stdout));
 444             closefds (3);
 445
 446             /*
 447              * We're not allocating the memory for the extra arguments,
 448              * because we never call arglist_free().  But if we ever change
 449              * that be sure to use getcpy() for the extra arguments.
 450              */
 451             arglist[argnum++] = "-form";
 452             arglist[argnum++] = filter;
 453             arglist[argnum++] = "-noclear";
 454
 455             switch (fmtproc) {
 456             case 1:
 457                 arglist[argnum++] = "-fmtproc";
 458                 arglist[argnum++] = formatproc;
 459                 break;
 460             case 0:
 461                 arglist[argnum++] = "-nofmtproc";
 462                 break;
 463             }
 464
 465             arglist[argnum++] = NULL;
 466
 467             execvp (mhl, arglist);
 468             errstr = strerror(errno);
 469             if (write(2, "unable to exec ", 15) < 0  ||
 470                 write(2, mhlproc, strlen(mhlproc)) < 0  ||
 471                 write(2, ": ", 2) < 0  ||
 472                 write(2, errstr, strlen(errstr)) < 0  ||
 473                 write(2, "\n", 1) < 0) {
 474                 advise ("stderr", "write");
 475             }
 476             _exit (-1);
 477
 478         default:
 479             if (pidXwait (pid, mhl))
 480                 done (1);
 481             fseek (out, 0L, SEEK_END);
 482             break;
 483     }
 484 }
 485
 486
 487 static
 488 char *
 489 fix_addresses (char *str) {
 490     char *fixed_str = NULL;
 491     int fixed_address = 0;
 492
 493     if (str) {
 494         /*
 495          * Attempt to parse each of the addresses in str.  If any fail
 496          * and can be fixed with escape_local_part(), do that.  This
 497          * is extra ugly because getm()'s state can only be reset by
 498          * call getname(), and getname() needs to be called repeatedly
 499          * until it returns NULL to reset its state.
 500          */
 501         struct adr_node {
 502             char *adr;
 503             int escape_local_part;
 504             int fixed;
 505             struct adr_node *next;
 506         } *adrs = NULL;
 507         struct adr_node *np = adrs;
 508         char *cp;
 509
 510         /*
 511          * First, put each of the addresses in a linked list.  Note
 512          * invalid addresses that might be fixed by escaping the
 513          * local part.
 514          */
 515         while ((cp = getname (str))) {
 516             struct adr_node *adr_nodep;
 517             char error[BUFSIZ];
 518             struct mailname *mp;
 519
 520             NEW(adr_nodep);
 521             adr_nodep->adr = strdup (cp);
 522             adr_nodep->escape_local_part = 0;
 523             adr_nodep->fixed = 0;
 524             adr_nodep->next = NULL;
 525
 526             /* With AD_NAME, errors are not reported to user. */
 527             if ((mp = getm (cp, dfhost, dftype, error,
 528                             sizeof(error))) == NULL) {
 529                 const char *no_at_sign = "no at-sign after local-part";
 530
 531                 adr_nodep->escape_local_part =
 532                     has_prefix(error, no_at_sign);
 533             } else {
 534                 mnfree (mp);
 535             }
 536
 537             if (np) {
 538                 np = np->next = adr_nodep;
 539             } else {
 540                 np = adrs = adr_nodep;
 541             }
 542         }
 543
 544         /*
 545          * Walk the list and try to fix broken addresses.
 546          */
 547         for (np = adrs; np; np = np->next) {
 548             char *display_name = strdup (np->adr);
 549             size_t len = strlen (display_name);
 550
 551             if (np->escape_local_part) {
 552                 char *local_part_end = strrchr (display_name, '<');
 553                 char *angle_addr = strdup (local_part_end);
 554                 struct mailname *mp;
 555                 char *new_adr, *adr;
 556
 557                 *local_part_end = '\0';
 558                 /* Trim any trailing whitespace. */
 559                 while (local_part_end > display_name  &&
 560                        isspace ((unsigned char) *--local_part_end)) {
 561                     *local_part_end = '\0';
 562                 }
 563                 escape_local_part (display_name, len);
 564                 new_adr = concat (display_name, " ", angle_addr, NULL);
 565                 adr = getname (new_adr);
 566                 if (adr != NULL  &&
 567                     (mp = getm (adr, dfhost, dftype, NULL, 0)) != NULL) {
 568                     fixed_address = 1;
 569                     mnfree (mp);
 570                 }
 571                 free (angle_addr);
 572                 free (new_adr);
 573                 free (np->adr);
 574                 np->adr = strdup (adr);
 575
 576                 /* Need to flush getname() */
 577                 while ((cp = getname (""))) continue;
 578             } /* else the np->adr is OK, so use it as-is. */
 579
 580             free (display_name);
 581         }
 582
 583         /*
 584          * If any addresses were repaired, build new address string,
 585          * replacing broken addresses.
 586          */
 587         for (np = adrs; np; ) {
 588             struct adr_node *next = np->next;
 589
 590             if (fixed_address) {
 591                 if (fixed_str) {
 592                     char *new_str = concat (fixed_str, ", ", np->adr, NULL);
 593
 594                     free (fixed_str);
 595                     fixed_str = new_str;
 596                 } else {
 597                     fixed_str = strdup (np->adr);
 598                 }
 599             }
 600
 601             free (np->adr);
 602             free (np);
 603             np = next;
 604         }
 605     }
 606
 607     if (fixed_address) {
 608         return fixed_str;
 609     }
 610     free (fixed_str);
 611     return str  ?  strdup (str)  :  NULL;
 612 }