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     if (!ccme)
 119         ismymbox (NULL);
 120
 121     /*
 122      * pick any interesting stuff out of msg "inb"
 123      */
 124     for (;;) {
 125         int msg_count = sizeof tmpbuf;
 126         state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 127         switch (state) {
 128             case FLD:
 129             case FLDPLUS:
 130                 /*
 131                  * if we're interested in this component, save a pointer
 132                  * to the component text, then start using our next free
 133                  * buffer as the component temp buffer (buffer switching
 134                  * saves an extra copy of the component text).
 135                  */
 136
 137                 i = fmt_addcomptext(name, tmpbuf);
 138                 if (i != -1) {
 139                     char_read += msg_count;
 140                     while (state == FLDPLUS) {
 141                         msg_count= sizeof tmpbuf;
 142                         state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 143                         fmt_appendcomp(i, name, tmpbuf);
 144                         char_read += msg_count;
 145                     }
 146                 }
 147
 148                 while (state == FLDPLUS) {
 149                     msg_count= sizeof tmpbuf;
 150                     state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 151                 }
 152                 break;
 153
 154             case LENERR:
 155             case FMTERR:
 156             case BODY:
 157             case FILEEOF:
 158                 goto finished;
 159
 160             default:
 161                 adios (NULL, "m_getfld() returned %d", state);
 162         }
 163     }
 164
 165     /*
 166      * format and output the header lines.
 167      */
 168 finished:
 169     m_getfld_state_destroy (&gstate);
 170
 171     /* set up the "fcc" pseudo-component */
 172     cptr = fmt_findcomp ("fcc");
 173     if (cptr) {
 174         mh_xfree(cptr->c_text);
 175         if (fcc)
 176             cptr->c_text = mh_xstrdup(fcc);
 177         else
 178             cptr->c_text = NULL;
 179     }
 180     cptr = fmt_findcomp ("user");
 181     if (cptr) {
 182         mh_xfree(cptr->c_text);
 183         if ((cp = getenv("USER")))
 184             cptr->c_text = mh_xstrdup(cp);
 185         else
 186             cptr = NULL;
 187     }
 188
 189     /*
 190      * if there's a "Subject" component, strip any "Re:"s off it
 191      */
 192     cptr = fmt_findcomp ("subject");
 193     if (cptr && (cp = cptr->c_text)) {
 194         char *sp = cp;
 195
 196         for (;;) {
 197             while (isspace((unsigned char) *cp))
 198                 cp++;
 199             if(uprf(cp, "re:"))
 200                 cp += 3;
 201             else
 202                 break;
 203             sp = cp;
 204         }
 205         if (sp != cptr->c_text) {
 206             cp = cptr->c_text;
 207             cptr->c_text = mh_xstrdup(sp);
 208             free (cp);
 209         }
 210     }
 211     i = format_len + char_read + 256;
 212     scanl = charstring_create (i + 2);
 213     dat[0] = 0;
 214     dat[1] = 0;
 215     dat[2] = 0;
 216     dat[3] = outputlinelen;
 217     dat[4] = 0;
 218     memset(&cb, 0, sizeof(cb));
 219     cb.formataddr = replformataddr;
 220     cb.concataddr = replconcataddr;
 221     fmt_scan (fmt, scanl, i, dat, &cb);
 222     fputs (charstring_buffer (scanl), out);
 223     if (badaddrs) {
 224         fputs ("\nrepl: bad addresses:\n", out);
 225         fputs ( badaddrs, out);
 226     }
 227
 228     /*
 229      * Check if we should filter the message
 230      * or add mhn directives
 231      */
 232     if (filter) {
 233         fflush(out);
 234         if (ferror (out))
 235             adios (drft, "error writing");
 236
 237         replfilter (inb, out, filter, fmtproc);
 238     } else if (mime && mp) {
 239             fprintf (out, "#forw [original message] +%s %s\n",
 240                      mp->foldpath, m_name (mp->lowsel));
 241     }
 242
 243     fflush(out);
 244     if (ferror (out))
 245         adios (drft, "error writing");
 246     fclose (out);
 247
 248     /* return dynamically allocated buffers */
 249     charstring_free (scanl);
 250     fmt_free(fmt, 1);
 251 }
 252
 253 static char *buf;               /* our current working buffer */
 254 static char *bufend;            /* end of working buffer */
 255 static char *last_dst;          /* buf ptr at end of last call */
 256 static unsigned int bufsiz=0;   /* current size of buf */
 257
 258 #define BUFINCR 512             /* how much to expand buf when if fills */
 259
 260 #define CPY(s) { cp = (s); while ((*dst++ = *cp++)) ; --dst; }
 261
 262 /*
 263  * check if there's enough room in buf for str.
 264  * add more mem if needed
 265  */
 266 #define CHECKMEM(str) \
 267             if ((len = strlen (str)) >= bufend - dst) {\
 268                 int i = dst - buf;\
 269                 int n = last_dst - buf;\
 270                 bufsiz += ((dst + len - bufend) / BUFINCR + 1) * BUFINCR;\
 271                 buf = mh_xrealloc (buf, bufsiz);\
 272                 dst = buf + i;\
 273                 last_dst = buf + n;\
 274                 bufend = buf + bufsiz;\
 275             }
 276
 277
 278 /*
 279  * fmt_scan will call this routine if the user includes the function
 280  * "(formataddr {component})" in a format string.  "orig" is the
 281  * original contents of the string register.  "str" is the address
 282  * string to be formatted and concatenated onto orig.  This routine
 283  * returns a pointer to the concatenated address string.
 284  *
 285  * We try to not do a lot of malloc/copy/free's (which is why we
 286  * don't call "getcpy") but still place no upper limit on the
 287  * length of the result string.
 288  */
 289 static char *
 290 replformataddr (char *orig, char *str)
 291 {
 292     int len;
 293     char baddr[BUFSIZ], error[BUFSIZ];
 294     int isgroup;
 295     char *dst;
 296     char *cp;
 297     char *sp;
 298     struct mailname *mp = NULL;
 299     char *fixed_str = fix_addresses (str);
 300
 301     /* if we don't have a buffer yet, get one */
 302     if (bufsiz == 0) {
 303         buf = mh_xmalloc (BUFINCR);
 304         last_dst = buf;         /* XXX */
 305         bufsiz = BUFINCR - 6;  /* leave some slop */
 306         bufend = buf + bufsiz;
 307     }
 308     /*
 309      * If "orig" points to our buffer we can just pick up where we
 310      * left off.  Otherwise we have to copy orig into our buffer.
 311      */
 312     if (orig == buf)
 313         dst = last_dst;
 314     else if (!orig || !*orig) {
 315         dst = buf;
 316         *dst = '\0';
 317     } else {
 318         dst = last_dst;         /* XXX */
 319         CHECKMEM (orig);
 320         CPY (orig);
 321     }
 322
 323     /* concatenate all the new addresses onto 'buf' */
 324     for (isgroup = 0; (cp = getname (fixed_str)); ) {
 325         if ((mp = getm (cp, dfhost, dftype, error, sizeof(error))) == NULL) {
 326             snprintf (baddr, sizeof(baddr), "\t%s -- %s\n", cp, error);
 327             badaddrs = add (baddr, badaddrs);
 328             continue;
 329         }
 330         if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
 331             *dst++ = ';';
 332             isgroup = 0;
 333         }
 334         if (insert (mp)) {
 335             /* if we get here we're going to add an address */
 336             if (dst != buf) {
 337                 *dst++ = ',';
 338                 *dst++ = ' ';
 339             }
 340             if (mp->m_gname) {
 341                 CHECKMEM (mp->m_gname);
 342                 CPY (mp->m_gname);
 343                 isgroup++;
 344             }
 345             sp = adrformat (mp);
 346             CHECKMEM (sp);
 347             CPY (sp);
 348         }
 349     }
 350
 351     free (fixed_str);
 352
 353     if (isgroup)
 354         *dst++ = ';';
 355
 356     *dst = '\0';
 357     last_dst = dst;
 358     return (buf);
 359 }
 360
 361
 362 /*
 363  * fmt_scan will call this routine if the user includes the function
 364  * "(concataddr {component})" in a format string.  This behaves exactly
 365  * like formataddr, except that it does NOT suppress duplicate addresses
 366  * between calls.
 367  *
 368  * As an implementation detail: I thought about splitting out replformataddr()
 369  * into the generic part and duplicate-suppressing part, but the call to
 370  * insert() was buried deep within a couple of loops and I didn't see a
 371  * way to do it easily.  So instead we simply set a special flag to stop
 372  * the duplicate check and call replformataddr().
 373  */
 374 static char *
 375 replconcataddr(char *orig, char *str)
 376 {
 377     char *cp;
 378
 379     nodupcheck = 1;
 380     cp = replformataddr(orig, str);
 381     nodupcheck = 0;
 382     return cp;
 383 }
 384
 385 static int
 386 insert (struct mailname *np)
 387 {
 388     char buffer[BUFSIZ];
 389     struct mailname *mp;
 390
 391     if (nodupcheck)
 392         return 1;
 393
 394     if (np->m_mbox == NULL)
 395         return 0;
 396
 397     for (mp = &mq; mp->m_next; mp = mp->m_next) {
 398         if (!strcasecmp (np->m_host ? np->m_host : "",
 399                          mp->m_next->m_host ? mp->m_next->m_host : "")  &&
 400             !strcasecmp (np->m_mbox ? np->m_mbox : "",
 401                          mp->m_next->m_mbox ? mp->m_next->m_mbox : ""))
 402             return 0;
 403     }
 404     if (!ccme && ismymbox (np))
 405         return 0;
 406
 407     if (querysw) {
 408         snprintf (buffer, sizeof(buffer), "Reply to %s? ", adrformat (np));
 409         if (!read_switch (buffer, anoyes))
 410         return 0;
 411     }
 412     mp->m_next = np;
 413
 414     return 1;
 415 }
 416
 417
 418 /*
 419  * Call the mhlproc
 420  *
 421  * This function expects that argument out has been fflushed by the caller.
 422  */
 423
 424 static void
 425 replfilter (FILE *in, FILE *out, char *filter, int fmtproc)
 426 {
 427     int pid;
 428     char *mhl;
 429     char *errstr;
 430     char **arglist;
 431     int argnum;
 432
 433     if (filter == NULL)
 434         return;
 435
 436     if (access (filter, R_OK) == NOTOK)
 437         adios (filter, "unable to read");
 438
 439     rewind (in);
 440     lseek (fileno(in), (off_t) 0, SEEK_SET);
 441
 442     arglist = argsplit(mhlproc, &mhl, &argnum);
 443
 444     switch (pid = fork()) {
 445         case NOTOK:
 446             adios ("fork", "unable to");
 447
 448         case OK:
 449             dup2 (fileno (in), fileno (stdin));
 450             dup2 (fileno (out), fileno (stdout));
 451             closefds (3);
 452
 453             /*
 454              * We're not allocating the memory for the extra arguments,
 455              * because we never call arglist_free().  But if we ever change
 456              * that be sure to use getcpy() for the extra arguments.
 457              */
 458             arglist[argnum++] = "-form";
 459             arglist[argnum++] = filter;
 460             arglist[argnum++] = "-noclear";
 461
 462             switch (fmtproc) {
 463             case 1:
 464                 arglist[argnum++] = "-fmtproc";
 465                 arglist[argnum++] = formatproc;
 466                 break;
 467             case 0:
 468                 arglist[argnum++] = "-nofmtproc";
 469                 break;
 470             }
 471
 472             arglist[argnum++] = NULL;
 473
 474             execvp (mhl, arglist);
 475             errstr = strerror(errno);
 476             if (write(2, "unable to exec ", 15) < 0  ||
 477                 write(2, mhlproc, strlen(mhlproc)) < 0  ||
 478                 write(2, ": ", 2) < 0  ||
 479                 write(2, errstr, strlen(errstr)) < 0  ||
 480                 write(2, "\n", 1) < 0) {
 481                 advise ("stderr", "write");
 482             }
 483             _exit (-1);
 484
 485         default:
 486             if (pidXwait (pid, mhl))
 487                 done (1);
 488             fseek (out, 0L, SEEK_END);
 489             break;
 490     }
 491 }
 492
 493
 494 static
 495 char *
 496 fix_addresses (char *str) {
 497     char *fixed_str = NULL;
 498     int fixed_address = 0;
 499
 500     if (str) {
 501         /*
 502          * Attempt to parse each of the addresses in str.  If any fail
 503          * and can be fixed with escape_local_part(), do that.  This
 504          * is extra ugly because getm()'s state can only be reset by
 505          * call getname(), and getname() needs to be called repeatedly
 506          * until it returns NULL to reset its state.
 507          */
 508         struct adr_node {
 509             char *adr;
 510             int escape_local_part;
 511             int fixed;
 512             struct adr_node *next;
 513         } *adrs = NULL;
 514         struct adr_node *np = adrs;
 515         char *cp;
 516
 517         /*
 518          * First, put each of the addresses in a linked list.  Note
 519          * invalid addresses that might be fixed by escaping the
 520          * local part.
 521          */
 522         while ((cp = getname (str))) {
 523             struct adr_node *adr_nodep;
 524             char error[BUFSIZ];
 525             struct mailname *mp;
 526
 527             NEW(adr_nodep);
 528             adr_nodep->adr = strdup (cp);
 529             adr_nodep->escape_local_part = 0;
 530             adr_nodep->fixed = 0;
 531             adr_nodep->next = NULL;
 532
 533             /* With AD_NAME, errors are not reported to user. */
 534             if ((mp = getm (cp, dfhost, dftype, error,
 535                             sizeof(error))) == NULL) {
 536                 const char *no_at_sign = "no at-sign after local-part";
 537
 538                 adr_nodep->escape_local_part =
 539                     has_prefix(error, no_at_sign);
 540             } else {
 541                 mnfree (mp);
 542             }
 543
 544             if (np) {
 545                 np = np->next = adr_nodep;
 546             } else {
 547                 np = adrs = adr_nodep;
 548             }
 549         }
 550
 551         /*
 552          * Walk the list and try to fix broken addresses.
 553          */
 554         for (np = adrs; np; np = np->next) {
 555             char *display_name = strdup (np->adr);
 556             size_t len = strlen (display_name);
 557
 558             if (np->escape_local_part) {
 559                 char *local_part_end = strrchr (display_name, '<');
 560                 char *angle_addr = strdup (local_part_end);
 561                 struct mailname *mp;
 562                 char *new_adr, *adr;
 563
 564                 *local_part_end = '\0';
 565                 /* Trim any trailing whitespace. */
 566                 while (local_part_end > display_name  &&
 567                        isspace ((unsigned char) *--local_part_end)) {
 568                     *local_part_end = '\0';
 569                 }
 570                 escape_local_part (display_name, len);
 571                 new_adr = concat (display_name, " ", angle_addr, NULL);
 572                 adr = getname (new_adr);
 573                 if (adr != NULL  &&
 574                     (mp = getm (adr, dfhost, dftype, NULL, 0)) != NULL) {
 575                     fixed_address = 1;
 576                     mnfree (mp);
 577                 }
 578                 free (angle_addr);
 579                 free (new_adr);
 580                 free (np->adr);
 581                 np->adr = strdup (adr);
 582
 583                 /* Need to flush getname() */
 584                 while ((cp = getname (""))) continue;
 585             } /* else the np->adr is OK, so use it as-is. */
 586
 587             free (display_name);
 588         }
 589
 590         /*
 591          * If any addresses were repaired, build new address string,
 592          * replacing broken addresses.
 593          */
 594         for (np = adrs; np; ) {
 595             struct adr_node *next = np->next;
 596
 597             if (fixed_address) {
 598                 if (fixed_str) {
 599                     char *new_str = concat (fixed_str, ", ", np->adr, NULL);
 600
 601                     free (fixed_str);
 602                     fixed_str = new_str;
 603                 } else {
 604                     fixed_str = strdup (np->adr);
 605                 }
 606             }
 607
 608             free (np->adr);
 609             free (np);
 610             np = next;
 611         }
 612     }
 613
 614     if (fixed_address) {
 615         return fixed_str;
 616     }
 617     free (fixed_str);
 618     return str  ?  strdup (str)  :  NULL;
 619 }