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