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