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 #include <errno.h>
  16
  17 extern short ccto;              /* from repl.c */
  18 extern short cccc;
  19 extern short ccme;
  20 extern short querysw;
  21
  22 static int dftype=0;
  23
  24 static char *badaddrs = NULL;
  25 static char *dfhost = NULL;
  26
  27 static struct mailname mq;
  28 static int nodupcheck = 0;              /* If set, no check for duplicates */
  29
  30 /*
  31  * Buffer size for content part of header fields.
  32  * We want this to be large enough so that we don't
  33  * do a lot of extra FLDPLUS calls on m_getfld but
  34  * small enough so that we don't snarf the entire
  35  * message body when we're not going to use any of it.
  36  */
  37 #define SBUFSIZ 256
  38
  39 static struct format *fmt;
  40
  41 static int ncomps = 0;                  /* # of interesting components */
  42 static char **compbuffers = NULL;       /* buffers for component text */
  43 static struct comp **used_buf = NULL;   /* stack for comp that use buffers */
  44
  45 static int dat[5];                      /* aux. data for format routine */
  46
  47 static char *addrcomps[] = {
  48     "from",
  49     "sender",
  50     "reply-to",
  51     "to",
  52     "cc",
  53     "bcc",
  54     "resent-from",
  55     "resent-sender",
  56     "resent-reply-to",
  57     "resent-to",
  58     "resent-cc",
  59     "resent-bcc",
  60     NULL
  61 };
  62
  63 /*
  64  * static prototypes
  65  */
  66 static int insert (struct mailname *);
  67 static void replfilter (FILE *, FILE *, char *, int);
  68
  69
  70 void
  71 replout (FILE *inb, char *msg, char *drft, struct msgs *mp, int outputlinelen,
  72         int mime, char *form, char *filter, char *fcc, int fmtproc)
  73 {
  74     register int state, i;
  75     register struct comp *cptr;
  76     register char *tmpbuf;
  77     register char **nxtbuf;
  78     register char **ap;
  79     register struct comp **savecomp;
  80     int char_read = 0, format_len, mask;
  81     char name[NAMESZ], *scanl;
  82     unsigned char *cp;
  83     FILE *out;
  84     NMH_UNUSED (msg);
  85
  86     mask = umask(~m_gmprot());
  87     if ((out = fopen (drft, "w")) == NULL)
  88         adios (drft, "unable to create");
  89
  90     umask(mask);
  91
  92     /* get new format string */
  93     cp = new_fs (form, NULL, NULL);
  94     format_len = strlen (cp);
  95
  96     /* compile format string */
  97     ncomps = fmt_compile (cp, &fmt) + 1;
  98
  99     if (!(nxtbuf = compbuffers = (char **)
 100             calloc((size_t) ncomps, sizeof(char *))))
 101         adios (NULL, "unable to allocate component buffers");
 102     if (!(savecomp = used_buf = (struct comp **)
 103             calloc((size_t) (ncomps+1), sizeof(struct comp *))))
 104         adios (NULL, "unable to allocate component buffer stack");
 105     savecomp += ncomps + 1;
 106     *--savecomp = NULL;         /* point at zero'd end minus 1 */
 107
 108     for (i = ncomps; i--; )
 109         *nxtbuf++ = mh_xmalloc(SBUFSIZ);
 110
 111     nxtbuf = compbuffers;               /* point at start */
 112     tmpbuf = *nxtbuf++;
 113
 114     for (ap = addrcomps; *ap; ap++) {
 115         FINDCOMP (cptr, *ap);
 116         if (cptr)
 117             cptr->c_type |= CT_ADDR;
 118     }
 119
 120     /*
 121      * ignore any components killed by command line switches
 122      */
 123     if (!ccto) {
 124         FINDCOMP (cptr, "to");
 125         if (cptr)
 126             cptr->c_name = "";
 127     }
 128     if (!cccc) {
 129         FINDCOMP (cptr, "cc");
 130         if (cptr)
 131             cptr->c_name = "";
 132     }
 133     /* set up the "fcc" pseudo-component */
 134     if (fcc) {
 135         FINDCOMP (cptr, "fcc");
 136         if (cptr)
 137             cptr->c_text = getcpy (fcc);
 138     }
 139     if ((cp = getenv("USER"))) {
 140         FINDCOMP (cptr, "user");
 141         if (cptr)
 142             cptr->c_text = getcpy(cp);
 143     }
 144     if (!ccme)
 145         ismymbox (NULL);
 146
 147     /*
 148      * pick any interesting stuff out of msg "inb"
 149      */
 150     for (state = FLD;;) {
 151         state = m_getfld (state, name, tmpbuf, SBUFSIZ, inb);
 152         switch (state) {
 153             case FLD:
 154             case FLDPLUS:
 155                 /*
 156                  * if we're interested in this component, save a pointer
 157                  * to the component text, then start using our next free
 158                  * buffer as the component temp buffer (buffer switching
 159                  * saves an extra copy of the component text).
 160                  */
 161                 if ((cptr = wantcomp[CHASH(name)]))
 162                     do {
 163                         if (!mh_strcasecmp(name, cptr->c_name)) {
 164                             char_read += msg_count;
 165                             if (! cptr->c_text) {
 166                                 cptr->c_text = tmpbuf;
 167                                 *--savecomp = cptr;
 168                                 tmpbuf = *nxtbuf++;
 169                             } else {
 170                                 i = strlen (cp = cptr->c_text) - 1;
 171                                 if (cp[i] == '\n') {
 172                                     if (cptr->c_type & CT_ADDR) {
 173                                         cp[i] = '\0';
 174                                         cp = add (",\n\t", cp);
 175                                     } else {
 176                                         cp = add ("\t", cp);
 177                                     }
 178                                 }
 179                                 cptr->c_text = add (tmpbuf, cp);
 180                             }
 181                             while (state == FLDPLUS) {
 182                                 state = m_getfld (state, name, tmpbuf,
 183                                                   SBUFSIZ, inb);
 184                                 cptr->c_text = add (tmpbuf, cptr->c_text);
 185                                 char_read += msg_count;
 186                             }
 187                             break;
 188                         }
 189                     } while ((cptr = cptr->c_next));
 190
 191                 while (state == FLDPLUS)
 192                     state = m_getfld (state, name, tmpbuf, SBUFSIZ, inb);
 193                 break;
 194
 195             case LENERR:
 196             case FMTERR:
 197             case BODY:
 198             case FILEEOF:
 199                 goto finished;
 200
 201             default:
 202                 adios (NULL, "m_getfld() returned %d", state);
 203         }
 204     }
 205
 206     /*
 207      * format and output the header lines.
 208      */
 209 finished:
 210
 211     /*
 212      * if there's a "Subject" component, strip any "Re:"s off it
 213      */
 214     FINDCOMP (cptr, "subject")
 215     if (cptr && (cp = cptr->c_text)) {
 216         register char *sp = cp;
 217
 218         for (;;) {
 219             while (isspace(*cp))
 220                 cp++;
 221             if(uprf(cp, "re:"))
 222                 cp += 3;
 223             else
 224                 break;
 225             sp = cp;
 226         }
 227         if (sp != cptr->c_text) {
 228             cp = cptr->c_text;
 229             cptr->c_text = getcpy (sp);
 230             free (cp);
 231         }
 232     }
 233     i = format_len + char_read + 256;
 234     scanl = mh_xmalloc ((size_t) i + 2);
 235     dat[0] = 0;
 236     dat[1] = 0;
 237     dat[2] = 0;
 238     dat[3] = outputlinelen;
 239     dat[4] = 0;
 240     fmt_scan (fmt, scanl, i + 1, i, dat);
 241     fputs (scanl, out);
 242     if (badaddrs) {
 243         fputs ("\nrepl: bad addresses:\n", out);
 244         fputs ( badaddrs, out);
 245     }
 246
 247     /*
 248      * Check if we should filter the message
 249      * or add mhn directives
 250      */
 251     if (filter) {
 252         fflush(out);
 253         if (ferror (out))
 254             adios (drft, "error writing");
 255
 256         replfilter (inb, out, filter, fmtproc);
 257     } else if (mime && mp) {
 258             fprintf (out, "#forw [original message] +%s %s\n",
 259                      mp->foldpath, m_name (mp->lowsel));
 260     }
 261
 262     fflush(out);
 263     if (ferror (out))
 264         adios (drft, "error writing");
 265     fclose (out);
 266
 267     /* return dynamically allocated buffers */
 268     free (scanl);
 269     for (nxtbuf = compbuffers, i = ncomps; (cptr = *savecomp++); nxtbuf++, i--)
 270         free (cptr->c_text);    /* if not nxtbuf, nxtbuf already freed */
 271     while ( i-- > 0)
 272         free (*nxtbuf++);       /* free unused nxtbufs */
 273     free ((char *) compbuffers);
 274     free ((char *) used_buf);
 275 }
 276
 277 static char *buf;               /* our current working buffer */
 278 static char *bufend;            /* end of working buffer */
 279 static char *last_dst;          /* buf ptr at end of last call */
 280 static unsigned int bufsiz=0;   /* current size of buf */
 281
 282 #define BUFINCR 512             /* how much to expand buf when if fills */
 283
 284 #define CPY(s) { cp = (s); while ((*dst++ = *cp++)) ; --dst; }
 285
 286 /*
 287  * check if there's enough room in buf for str.
 288  * add more mem if needed
 289  */
 290 #define CHECKMEM(str) \
 291             if ((len = strlen (str)) >= bufend - dst) {\
 292                 int i = dst - buf;\
 293                 int n = last_dst - buf;\
 294                 bufsiz += ((dst + len - bufend) / BUFINCR + 1) * BUFINCR;\
 295                 buf = mh_xrealloc (buf, bufsiz);\
 296                 dst = buf + i;\
 297                 last_dst = buf + n;\
 298                 bufend = buf + bufsiz;\
 299             }
 300
 301
 302 /*
 303  * fmt_scan will call this routine if the user includes the function
 304  * "(formataddr {component})" in a format string.  "orig" is the
 305  * original contents of the string register.  "str" is the address
 306  * string to be formatted and concatenated onto orig.  This routine
 307  * returns a pointer to the concatenated address string.
 308  *
 309  * We try to not do a lot of malloc/copy/free's (which is why we
 310  * don't call "getcpy") but still place no upper limit on the
 311  * length of the result string.
 312  */
 313 char *
 314 formataddr (char *orig, char *str)
 315 {
 316     register int len;
 317     char baddr[BUFSIZ], error[BUFSIZ];
 318     register int isgroup;
 319     register char *dst;
 320     register char *cp;
 321     register char *sp;
 322     register struct mailname *mp = NULL;
 323
 324     /* if we don't have a buffer yet, get one */
 325     if (bufsiz == 0) {
 326         buf = mh_xmalloc (BUFINCR);
 327         last_dst = buf;         /* XXX */
 328         bufsiz = BUFINCR - 6;  /* leave some slop */
 329         bufend = buf + bufsiz;
 330     }
 331     /*
 332      * If "orig" points to our buffer we can just pick up where we
 333      * left off.  Otherwise we have to copy orig into our buffer.
 334      */
 335     if (orig == buf)
 336         dst = last_dst;
 337     else if (!orig || !*orig) {
 338         dst = buf;
 339         *dst = '\0';
 340     } else {
 341         dst = last_dst;         /* XXX */
 342         CHECKMEM (orig);
 343         CPY (orig);
 344     }
 345
 346     /* concatenate all the new addresses onto 'buf' */
 347     for (isgroup = 0; (cp = getname (str)); ) {
 348         if ((mp = getm (cp, dfhost, dftype, AD_NAME, error)) == NULL) {
 349             snprintf (baddr, sizeof(baddr), "\t%s -- %s\n", cp, error);
 350             badaddrs = add (baddr, badaddrs);
 351             continue;
 352         }
 353         if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
 354             *dst++ = ';';
 355             isgroup = 0;
 356         }
 357         if (insert (mp)) {
 358             /* if we get here we're going to add an address */
 359             if (dst != buf) {
 360                 *dst++ = ',';
 361                 *dst++ = ' ';
 362             }
 363             if (mp->m_gname) {
 364                 CHECKMEM (mp->m_gname);
 365                 CPY (mp->m_gname);
 366                 isgroup++;
 367             }
 368             sp = adrformat (mp);
 369             CHECKMEM (sp);
 370             CPY (sp);
 371         }
 372     }
 373
 374     if (isgroup)
 375         *dst++ = ';';
 376
 377     *dst = '\0';
 378     last_dst = dst;
 379     return (buf);
 380 }
 381
 382
 383 /*
 384  * fmt_scan will call this routine if the user includes the function
 385  * "(concataddr {component})" in a format string.  This behaves exactly
 386  * like formataddr, except that it does NOT suppress duplicate addresses
 387  * between calls.
 388  *
 389  * As an implementation detail: I thought about splitting out formataddr()
 390  * into the generic part and duplicate-suppressing part, but the call to
 391  * insert() was buried deep within a couple of loops and I didn't see a
 392  * way to do it easily.  So instead we simply set a special flag to stop
 393  * the duplicate check and call formataddr().
 394  */
 395 char *
 396 concataddr(char *orig, char *str)
 397 {
 398     char *cp;
 399
 400     nodupcheck = 1;
 401     cp = formataddr(orig, str);
 402     nodupcheck = 0;
 403     return cp;
 404 }
 405
 406 static int
 407 insert (struct mailname *np)
 408 {
 409     char buffer[BUFSIZ];
 410     register struct mailname *mp;
 411
 412     if (nodupcheck)
 413         return 1;
 414
 415     if (np->m_mbox == NULL)
 416         return 0;
 417
 418     for (mp = &mq; mp->m_next; mp = mp->m_next) {
 419         if (!mh_strcasecmp (np->m_host, mp->m_next->m_host)
 420                 && !mh_strcasecmp (np->m_mbox, mp->m_next->m_mbox))
 421             return 0;
 422     }
 423     if (!ccme && ismymbox (np))
 424         return 0;
 425
 426     if (querysw) {
 427         snprintf (buffer, sizeof(buffer), "Reply to %s? ", adrformat (np));
 428         if (!gans (buffer, anoyes))
 429         return 0;
 430     }
 431     mp->m_next = np;
 432
 433     return 1;
 434 }
 435
 436
 437 /*
 438  * Call the mhlproc
 439  *
 440  * This function expects that argument out has been fflushed by the caller.
 441  */
 442
 443 static void
 444 replfilter (FILE *in, FILE *out, char *filter, int fmtproc)
 445 {
 446     int pid;
 447     char *mhl;
 448     char *errstr;
 449     char *arglist[7];
 450
 451     if (filter == NULL)
 452         return;
 453
 454     if (access (filter, R_OK) == NOTOK)
 455         adios (filter, "unable to read");
 456
 457     mhl = r1bindex (mhlproc, '/');
 458
 459     rewind (in);
 460     lseek (fileno(in), (off_t) 0, SEEK_SET);
 461
 462     switch (pid = vfork()) {
 463         case NOTOK:
 464             adios ("fork", "unable to");
 465
 466         case OK:
 467             dup2 (fileno (in), fileno (stdin));
 468             dup2 (fileno (out), fileno (stdout));
 469             closefds (3);
 470
 471             arglist[0] = mhl;
 472             arglist[1] = "-form";
 473             arglist[2] = filter;
 474             arglist[3] = "-noclear";
 475
 476             switch (fmtproc) {
 477             case 1:
 478                 arglist[4] = "-fmtproc";
 479                 arglist[5] = formatproc;
 480                 arglist[6] = NULL;
 481                 break;
 482             case 0:
 483                 arglist[4] = "-nofmtproc";
 484                 arglist[5] = NULL;
 485                 break;
 486             default:
 487                 arglist[4] = NULL;
 488             }
 489
 490             execvp (mhlproc, arglist);
 491             errstr = strerror(errno);
 492             write(2, "unable to exec ", 15);
 493             write(2, mhlproc, strlen(mhlproc));
 494             write(2, ": ", 2);
 495             write(2, errstr, strlen(errstr));
 496             write(2, "\n", 1);
 497             _exit (-1);
 498
 499         default:
 500             if (pidXwait (pid, mhl))
 501                 done (1);
 502             fseek (out, 0L, SEEK_END);
 503             break;
 504     }
 505 }