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

   1 /* replsbr.c -- routines to help repl along...
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include <h/mh.h>
   9 #include <h/addrsbr.h>
  10 #include <h/fmt_scan.h>
  11 #include <h/utils.h>
  12 #include <sys/file.h>           /* L_SET */
  13
  14 extern short ccto;              /* from repl.c */
  15 extern short cccc;
  16 extern short ccme;
  17 extern short querysw;
  18
  19 static int dftype=0;
  20
  21 static char *badaddrs = NULL;
  22 static char *dfhost = NULL;
  23
  24 static struct mailname mq;
  25 static int nodupcheck = 0;              /* If set, no check for duplicates */
  26
  27 /*
  28  * Buffer size for content part of header fields.
  29  * We want this to be large enough so that we don't
  30  * do a lot of extra FLDPLUS calls on m_getfld but
  31  * small enough so that we don't snarf the entire
  32  * message body when we're not going to use any of it.
  33  */
  34 #define SBUFSIZ 256
  35
  36 static char *addrcomps[] = {
  37     "from",
  38     "sender",
  39     "reply-to",
  40     "to",
  41     "cc",
  42     "bcc",
  43     "resent-from",
  44     "resent-sender",
  45     "resent-reply-to",
  46     "resent-to",
  47     "resent-cc",
  48     "resent-bcc",
  49     NULL
  50 };
  51
  52 /*
  53  * static prototypes
  54  */
  55 static int insert (struct mailname *);
  56 static void replfilter (FILE *, FILE *, char *, int);
  57 static char *replformataddr(char *, char *);
  58 static char *replconcataddr(char *, char *);
  59 static char *fix_addresses (char *);
  60
  61
  62 void
  63 replout (FILE *inb, char *msg, char *drft, struct msgs *mp, int outputlinelen,
  64         int mime, char *form, char *filter, char *fcc, int fmtproc)
  65 {
  66     int state, i;
  67     struct comp *cptr;
  68     char tmpbuf[SBUFSIZ];
  69     struct format *fmt;
  70     char **ap;
  71     int char_read = 0, format_len, mask;
  72     char name[NAMESZ], *cp;
  73     charstring_t scanl;
  74     static int dat[5];                  /* aux. data for format routine */
  75     m_getfld_state_t gstate = 0;
  76     struct fmt_callbacks cb;
  77
  78     FILE *out;
  79     NMH_UNUSED (msg);
  80
  81     mask = umask(~m_gmprot());
  82     if ((out = fopen (drft, "w")) == NULL)
  83         adios (drft, "unable to create");
  84
  85     umask(mask);
  86
  87     /* get new format string */
  88     cp = new_fs (form, NULL, NULL);
  89     format_len = strlen (cp);
  90
  91     /* compile format string */
  92     fmt_compile (cp, &fmt, 1);
  93
  94     for (ap = addrcomps; *ap; ap++) {
  95         cptr = fmt_findcomp (*ap);
  96         if (cptr)
  97             cptr->c_type |= CT_ADDR;
  98     }
  99
 100     /*
 101      * ignore any components killed by command line switches
 102      *
 103      * This prevents the component from being found via fmt_findcomp(),
 104      * which makes sure no text gets added to it when the message is processed.
 105      */
 106     if (!ccto) {
 107         cptr = fmt_findcomp ("to");
 108         if (cptr)
 109             cptr->c_name = mh_xstrdup("");
 110     }
 111     if (!cccc) {
 112          cptr = fmt_findcomp("cc");
 113         if (cptr)
 114             cptr->c_name = mh_xstrdup("");
 115     }
 116     if (!ccme)
 117         ismymbox (NULL);
 118
 119     /*
 120      * pick any interesting stuff out of msg "inb"
 121      */
 122     for (;;) {
 123         int msg_count = sizeof tmpbuf;
 124         state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 125         switch (state) {
 126             case FLD:
 127             case FLDPLUS:
 128                 /*
 129                  * if we're interested in this component, save a pointer
 130                  * to the component text, then start using our next free
 131                  * buffer as the component temp buffer (buffer switching
 132                  * saves an extra copy of the component text).
 133                  */
 134
 135                 i = fmt_addcomptext(name, tmpbuf);
 136                 if (i != -1) {
 137                     char_read += msg_count;
 138                     while (state == FLDPLUS) {
 139                         msg_count= sizeof tmpbuf;
 140                         state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 141                         fmt_appendcomp(i, name, tmpbuf);
 142                         char_read += msg_count;
 143                     }
 144                 }
 145
 146                 while (state == FLDPLUS) {
 147                     msg_count= sizeof tmpbuf;
 148                     state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 149                 }
 150                 break;
 151
 152             case LENERR:
 153             case FMTERR:
 154             case BODY:
 155             case FILEEOF:
 156                 goto finished;
 157
 158             default:
 159                 adios (NULL, "m_getfld() returned %d", state);
 160         }
 161     }
 162
 163     /*
 164      * format and output the header lines.
 165      */
 166 finished:
 167     m_getfld_state_destroy (&gstate);
 168
 169     /* set up the "fcc" pseudo-component */
 170     cptr = fmt_findcomp ("fcc");
 171     if (cptr) {
 172         mh_xfree(cptr->c_text);
 173         if (fcc)
 174             cptr->c_text = mh_xstrdup(fcc);
 175         else
 176             cptr->c_text = NULL;
 177     }
 178     cptr = fmt_findcomp ("user");
 179     if (cptr) {
 180         mh_xfree(cptr->c_text);
 181         if ((cp = getenv("USER")))
 182             cptr->c_text = mh_xstrdup(cp);
 183         else
 184             cptr = NULL;
 185     }
 186
 187     /*
 188      * if there's a "Subject" component, strip any "Re:"s off it
 189      */
 190     cptr = fmt_findcomp ("subject");
 191     if (cptr && (cp = cptr->c_text)) {
 192         char *sp = cp;
 193
 194         for (;;) {
 195             while (isspace((unsigned char) *cp))
 196                 cp++;
 197             if(uprf(cp, "re:"))
 198                 cp += 3;
 199             else
 200                 break;
 201             sp = cp;
 202         }
 203         if (sp != cptr->c_text) {
 204             cp = cptr->c_text;
 205             cptr->c_text = mh_xstrdup(sp);
 206             free (cp);
 207         }
 208     }
 209     i = format_len + char_read + 256;
 210     scanl = charstring_create (i + 2);
 211     dat[0] = 0;
 212     dat[1] = 0;
 213     dat[2] = 0;
 214     dat[3] = outputlinelen;
 215     dat[4] = 0;
 216     memset(&cb, 0, sizeof(cb));
 217     cb.formataddr = replformataddr;
 218     cb.concataddr = replconcataddr;
 219     fmt_scan (fmt, scanl, i, dat, &cb);
 220     fputs (charstring_buffer (scanl), out);
 221     if (badaddrs) {
 222         fputs ("\nrepl: bad addresses:\n", out);
 223         fputs ( badaddrs, out);
 224     }
 225
 226     /*
 227      * Check if we should filter the message
 228      * or add mhn directives
 229      */
 230     if (filter) {
 231         fflush(out);
 232         if (ferror (out))
 233             adios (drft, "error writing");
 234
 235         replfilter (inb, out, filter, fmtproc);
 236     } else if (mime && mp) {
 237             fprintf (out, "#forw [original message] +%s %s\n",
 238                      mp->foldpath, m_name (mp->lowsel));
 239     }
 240
 241     fflush(out);
 242     if (ferror (out))
 243         adios (drft, "error writing");
 244     fclose (out);
 245
 246     /* return dynamically allocated buffers */
 247     charstring_free (scanl);
 248     fmt_free(fmt, 1);
 249 }
 250
 251 static char *buf;               /* our current working buffer */
 252 static char *bufend;            /* end of working buffer */
 253 static char *last_dst;          /* buf ptr at end of last call */
 254 static unsigned int bufsiz=0;   /* current size of buf */
 255
 256 #define BUFINCR 512             /* how much to expand buf when if fills */
 257
 258 #define CPY(s) { cp = (s); while ((*dst++ = *cp++)) ; --dst; }
 259
 260 /*
 261  * check if there's enough room in buf for str.
 262  * add more mem if needed
 263  */
 264 #define CHECKMEM(str) \
 265             if ((len = strlen (str)) >= bufend - dst) {\
 266                 int i = dst - buf;\
 267                 int n = last_dst - buf;\
 268                 bufsiz += ((dst + len - bufend) / BUFINCR + 1) * BUFINCR;\
 269                 buf = mh_xrealloc (buf, bufsiz);\
 270                 dst = buf + i;\
 271                 last_dst = buf + n;\
 272                 bufend = buf + bufsiz;\
 273             }
 274
 275
 276 /*
 277  * fmt_scan will call this routine if the user includes the function
 278  * "(formataddr {component})" in a format string.  "orig" is the
 279  * original contents of the string register.  "str" is the address
 280  * string to be formatted and concatenated onto orig.  This routine
 281  * returns a pointer to the concatenated address string.
 282  *
 283  * We try to not do a lot of malloc/copy/free's (which is why we
 284  * don't call "getcpy") but still place no upper limit on the
 285  * length of the result string.
 286  */
 287 static char *
 288 replformataddr (char *orig, char *str)
 289 {
 290     int len;
 291     char baddr[BUFSIZ], error[BUFSIZ];
 292     int isgroup;
 293     char *dst;
 294     char *cp;
 295     char *sp;
 296     struct mailname *mp = NULL;
 297     char *fixed_str = fix_addresses (str);
 298
 299     /* if we don't have a buffer yet, get one */
 300     if (bufsiz == 0) {
 301         buf = mh_xmalloc (BUFINCR);
 302         last_dst = buf;         /* XXX */
 303         bufsiz = BUFINCR - 6;  /* leave some slop */
 304         bufend = buf + bufsiz;
 305     }
 306     /*
 307      * If "orig" points to our buffer we can just pick up where we
 308      * left off.  Otherwise we have to copy orig into our buffer.
 309      */
 310     if (orig == buf)
 311         dst = last_dst;
 312     else if (!orig || !*orig) {
 313         dst = buf;
 314         *dst = '\0';
 315     } else {
 316         dst = last_dst;         /* XXX */
 317         CHECKMEM (orig);
 318         CPY (orig);
 319     }
 320
 321     /* concatenate all the new addresses onto 'buf' */
 322     for (isgroup = 0; (cp = getname (fixed_str)); ) {
 323         if ((mp = getm (cp, dfhost, dftype, error, sizeof(error))) == NULL) {
 324             snprintf (baddr, sizeof(baddr), "\t%s -- %s\n", cp, error);
 325             badaddrs = add (baddr, badaddrs);
 326             continue;
 327         }
 328         if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
 329             *dst++ = ';';
 330             isgroup = 0;
 331         }
 332         if (insert (mp)) {
 333             /* if we get here we're going to add an address */
 334             if (dst != buf) {
 335                 *dst++ = ',';
 336                 *dst++ = ' ';
 337             }
 338             if (mp->m_gname) {
 339                 CHECKMEM (mp->m_gname);
 340                 CPY (mp->m_gname);
 341                 isgroup++;
 342             }
 343             sp = adrformat (mp);
 344             CHECKMEM (sp);
 345             CPY (sp);
 346         }
 347     }
 348
 349     free (fixed_str);
 350
 351     if (isgroup)
 352         *dst++ = ';';
 353
 354     *dst = '\0';
 355     last_dst = dst;
 356     return (buf);
 357 }
 358
 359
 360 /*
 361  * fmt_scan will call this routine if the user includes the function
 362  * "(concataddr {component})" in a format string.  This behaves exactly
 363  * like formataddr, except that it does NOT suppress duplicate addresses
 364  * between calls.
 365  *
 366  * As an implementation detail: I thought about splitting out replformataddr()
 367  * into the generic part and duplicate-suppressing part, but the call to
 368  * insert() was buried deep within a couple of loops and I didn't see a
 369  * way to do it easily.  So instead we simply set a special flag to stop
 370  * the duplicate check and call replformataddr().
 371  */
 372 static char *
 373 replconcataddr(char *orig, char *str)
 374 {
 375     char *cp;
 376
 377     nodupcheck = 1;
 378     cp = replformataddr(orig, str);
 379     nodupcheck = 0;
 380     return cp;
 381 }
 382
 383 static int
 384 insert (struct mailname *np)
 385 {
 386     char buffer[BUFSIZ];
 387     struct mailname *mp;
 388
 389     if (nodupcheck)
 390         return 1;
 391
 392     if (np->m_mbox == NULL)
 393         return 0;
 394
 395     for (mp = &mq; mp->m_next; mp = mp->m_next) {
 396         if (!strcasecmp (np->m_host ? np->m_host : "",
 397                          mp->m_next->m_host ? mp->m_next->m_host : "")  &&
 398             !strcasecmp (np->m_mbox ? np->m_mbox : "",
 399                          mp->m_next->m_mbox ? mp->m_next->m_mbox : ""))
 400             return 0;
 401     }
 402     if (!ccme && ismymbox (np))
 403         return 0;
 404
 405     if (querysw) {
 406         snprintf (buffer, sizeof(buffer), "Reply to %s? ", adrformat (np));
 407         if (!read_switch (buffer, anoyes))
 408         return 0;
 409     }
 410     mp->m_next = np;
 411
 412     return 1;
 413 }
 414
 415
 416 /*
 417  * Call the mhlproc
 418  *
 419  * This function expects that argument out has been fflushed by the caller.
 420  */
 421
 422 static void
 423 replfilter (FILE *in, FILE *out, char *filter, int fmtproc)
 424 {
 425     int pid;
 426     char *mhl;
 427     char *errstr;
 428     char **arglist;
 429     int argnum;
 430
 431     if (filter == NULL)
 432         return;
 433
 434     if (access (filter, R_OK) == NOTOK)
 435         adios (filter, "unable to read");
 436
 437     rewind (in);
 438     lseek (fileno(in), (off_t) 0, SEEK_SET);
 439
 440     arglist = argsplit(mhlproc, &mhl, &argnum);
 441
 442     switch (pid = fork()) {
 443         case NOTOK:
 444             adios ("fork", "unable to");
 445
 446         case OK:
 447             dup2 (fileno (in), fileno (stdin));
 448             dup2 (fileno (out), fileno (stdout));
 449             closefds (3);
 450
 451             /*
 452              * We're not allocating the memory for the extra arguments,
 453              * because we never call arglist_free().  But if we ever change
 454              * that be sure to use getcpy() for the extra arguments.
 455              */
 456             arglist[argnum++] = "-form";
 457             arglist[argnum++] = filter;
 458             arglist[argnum++] = "-noclear";
 459
 460             switch (fmtproc) {
 461             case 1:
 462                 arglist[argnum++] = "-fmtproc";
 463                 arglist[argnum++] = formatproc;
 464                 break;
 465             case 0:
 466                 arglist[argnum++] = "-nofmtproc";
 467                 break;
 468             }
 469
 470             arglist[argnum++] = NULL;
 471
 472             execvp (mhl, arglist);
 473             errstr = strerror(errno);
 474             if (write(2, "unable to exec ", 15) < 0  ||
 475                 write(2, mhlproc, strlen(mhlproc)) < 0  ||
 476                 write(2, ": ", 2) < 0  ||
 477                 write(2, errstr, strlen(errstr)) < 0  ||
 478                 write(2, "\n", 1) < 0) {
 479                 advise ("stderr", "write");
 480             }
 481             _exit (-1);
 482
 483         default:
 484             if (pidXwait (pid, mhl))
 485                 done (1);
 486             fseek (out, 0L, SEEK_END);
 487             break;
 488     }
 489 }
 490
 491
 492 static
 493 char *
 494 fix_addresses (char *str) {
 495     char *fixed_str = NULL;
 496     int fixed_address = 0;
 497
 498     if (str) {
 499         /*
 500          * Attempt to parse each of the addresses in str.  If any fail
 501          * and can be fixed with escape_local_part(), do that.  This
 502          * is extra ugly because getm()'s state can only be reset by
 503          * call getname(), and getname() needs to be called repeatedly
 504          * until it returns NULL to reset its state.
 505          */
 506         struct adr_node {
 507             char *adr;
 508             int escape_local_part;
 509             int fixed;
 510             struct adr_node *next;
 511         } *adrs = NULL;
 512         struct adr_node *np = adrs;
 513         char *cp;
 514
 515         /*
 516          * First, put each of the addresses in a linked list.  Note
 517          * invalid addresses that might be fixed by escaping the
 518          * local part.
 519          */
 520         while ((cp = getname (str))) {
 521             struct adr_node *adr_nodep;
 522             char error[BUFSIZ];
 523             struct mailname *mp;
 524
 525             NEW(adr_nodep);
 526             adr_nodep->adr = mh_xstrdup (cp);
 527             adr_nodep->escape_local_part = 0;
 528             adr_nodep->fixed = 0;
 529             adr_nodep->next = NULL;
 530
 531             /* With AD_NAME, errors are not reported to user. */
 532             if ((mp = getm (cp, dfhost, dftype, error,
 533                             sizeof(error))) == NULL) {
 534                 const char *no_at_sign = "no at-sign after local-part";
 535
 536                 adr_nodep->escape_local_part =
 537                     has_prefix(error, no_at_sign);
 538             } else {
 539                 mnfree (mp);
 540             }
 541
 542             if (np) {
 543                 np = np->next = adr_nodep;
 544             } else {
 545                 np = adrs = adr_nodep;
 546             }
 547         }
 548
 549         /*
 550          * Walk the list and try to fix broken addresses.
 551          */
 552         for (np = adrs; np; np = np->next) {
 553             char *display_name = mh_xstrdup (np->adr);
 554             size_t len = strlen (display_name);
 555
 556             if (np->escape_local_part) {
 557                 char *local_part_end = strrchr (display_name, '<');
 558                 char *angle_addr = mh_xstrdup (local_part_end);
 559                 struct mailname *mp;
 560                 char *new_adr, *adr;
 561
 562                 *local_part_end = '\0';
 563                 /* Trim any trailing whitespace. */
 564                 while (local_part_end > display_name  &&
 565                        isspace ((unsigned char) *--local_part_end)) {
 566                     *local_part_end = '\0';
 567                 }
 568                 escape_local_part (display_name, len);
 569                 new_adr = concat (display_name, " ", angle_addr, NULL);
 570                 adr = getname (new_adr);
 571                 if (adr != NULL  &&
 572                     (mp = getm (adr, dfhost, dftype, NULL, 0)) != NULL) {
 573                     fixed_address = 1;
 574                     mnfree (mp);
 575                 }
 576                 free (angle_addr);
 577                 free (new_adr);
 578                 free (np->adr);
 579                 np->adr = mh_xstrdup (adr);
 580
 581                 /* Need to flush getname() */
 582                 while ((cp = getname (""))) continue;
 583             } /* else the np->adr is OK, so use it as-is. */
 584
 585             free (display_name);
 586         }
 587
 588         /*
 589          * If any addresses were repaired, build new address string,
 590          * replacing broken addresses.
 591          */
 592         for (np = adrs; np; ) {
 593             struct adr_node *next = np->next;
 594
 595             if (fixed_address) {
 596                 if (fixed_str) {
 597                     char *new_str = concat (fixed_str, ", ", np->adr, NULL);
 598
 599                     free (fixed_str);
 600                     fixed_str = new_str;
 601                 } else {
 602                     fixed_str = mh_xstrdup (np->adr);
 603                 }
 604             }
 605
 606             free (np->adr);
 607             free (np);
 608             np = next;
 609         }
 610     }
 611
 612     if (fixed_address) {
 613         return fixed_str;
 614     }
 615     free (fixed_str);
 616     return str  ?  mh_xstrdup (str)  :  NULL;
 617 }