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 char *addrcomps[] = {
  40     "from",
  41     "sender",
  42     "reply-to",
  43     "to",
  44     "cc",
  45     "bcc",
  46     "resent-from",
  47     "resent-sender",
  48     "resent-reply-to",
  49     "resent-to",
  50     "resent-cc",
  51     "resent-bcc",
  52     NULL
  53 };
  54
  55 /*
  56  * static prototypes
  57  */
  58 static int insert (struct mailname *);
  59 static void replfilter (FILE *, FILE *, char *, int);
  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     register int state, i;
  67     register struct comp *cptr;
  68     char tmpbuf[SBUFSIZ];
  69     struct format *fmt;
  70     register char **ap;
  71     int char_read = 0, format_len, mask;
  72     char name[NAMESZ], *scanl, *cp;
  73     static int dat[5];                  /* aux. data for format routine */
  74     m_getfld_state_t gstate = 0;
  75
  76     FILE *out;
  77     NMH_UNUSED (msg);
  78
  79     mask = umask(~m_gmprot());
  80     if ((out = fopen (drft, "w")) == NULL)
  81         adios (drft, "unable to create");
  82
  83     umask(mask);
  84
  85     /* get new format string */
  86     cp = new_fs (form, NULL, NULL);
  87     format_len = strlen (cp);
  88
  89     /* compile format string */
  90     fmt_compile (cp, &fmt, 1);
  91
  92     for (ap = addrcomps; *ap; ap++) {
  93         cptr = fmt_findcomp (*ap);
  94         if (cptr)
  95             cptr->c_type |= CT_ADDR;
  96     }
  97
  98     /*
  99      * ignore any components killed by command line switches
 100      *
 101      * This prevents the component from being found via fmt_findcomp(),
 102      * which makes sure no text gets added to it when the message is processed.
 103      *
 104      * getcpy(NULL) returns a malloc'd zero-length string, so it can safely
 105      * be free()'d later.
 106      */
 107     if (!ccto) {
 108         cptr = fmt_findcomp ("to");
 109         if (cptr)
 110             cptr->c_name = getcpy(NULL);
 111     }
 112     if (!cccc) {
 113          cptr = fmt_findcomp("cc");
 114         if (cptr)
 115             cptr->c_name = getcpy(NULL);
 116     }
 117     /* set up the "fcc" pseudo-component */
 118     if (fcc) {
 119         cptr = fmt_findcomp ("fcc");
 120         if (cptr)
 121             cptr->c_text = getcpy (fcc);
 122     }
 123     if ((cp = getenv("USER"))) {
 124         cptr = fmt_findcomp ("user");
 125         if (cptr)
 126             cptr->c_text = getcpy(cp);
 127     }
 128     if (!ccme)
 129         ismymbox (NULL);
 130
 131     /*
 132      * pick any interesting stuff out of msg "inb"
 133      */
 134     for (;;) {
 135         int msg_count = sizeof tmpbuf;
 136         state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 137         switch (state) {
 138             case FLD:
 139             case FLDPLUS:
 140                 /*
 141                  * if we're interested in this component, save a pointer
 142                  * to the component text, then start using our next free
 143                  * buffer as the component temp buffer (buffer switching
 144                  * saves an extra copy of the component text).
 145                  */
 146
 147                 i = fmt_addcomptext(name, tmpbuf);
 148                 if (i != -1) {
 149                     char_read += msg_count;
 150                     while (state == FLDPLUS) {
 151                         msg_count= sizeof tmpbuf;
 152                         state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 153                         fmt_appendcomp(i, name, tmpbuf);
 154                         char_read += msg_count;
 155                     }
 156                 }
 157
 158                 while (state == FLDPLUS) {
 159                     msg_count= sizeof tmpbuf;
 160                     state = m_getfld (&gstate, name, tmpbuf, &msg_count, inb);
 161                 }
 162                 break;
 163
 164             case LENERR:
 165             case FMTERR:
 166             case BODY:
 167             case FILEEOF:
 168                 goto finished;
 169
 170             default:
 171                 adios (NULL, "m_getfld() returned %d", state);
 172         }
 173     }
 174
 175     /*
 176      * format and output the header lines.
 177      */
 178 finished:
 179     m_getfld_state_destroy (&gstate);
 180
 181     /*
 182      * if there's a "Subject" component, strip any "Re:"s off it
 183      */
 184     cptr = fmt_findcomp ("subject");
 185     if (cptr && (cp = cptr->c_text)) {
 186         register char *sp = cp;
 187
 188         for (;;) {
 189             while (isspace((unsigned char) *cp))
 190                 cp++;
 191             if(uprf(cp, "re:"))
 192                 cp += 3;
 193             else
 194                 break;
 195             sp = cp;
 196         }
 197         if (sp != cptr->c_text) {
 198             cp = cptr->c_text;
 199             cptr->c_text = getcpy (sp);
 200             free (cp);
 201         }
 202     }
 203     i = format_len + char_read + 256;
 204     scanl = mh_xmalloc ((size_t) i + 2);
 205     dat[0] = 0;
 206     dat[1] = 0;
 207     dat[2] = 0;
 208     dat[3] = outputlinelen;
 209     dat[4] = 0;
 210     fmt_scan (fmt, scanl, i + 1, i, dat);
 211     fputs (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     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 char *
 279 formataddr (char *orig, char *str)
 280 {
 281     register int len;
 282     char baddr[BUFSIZ], error[BUFSIZ];
 283     register int isgroup;
 284     register char *dst;
 285     register char *cp;
 286     register char *sp;
 287     register struct mailname *mp = NULL;
 288
 289     /* if we don't have a buffer yet, get one */
 290     if (bufsiz == 0) {
 291         buf = mh_xmalloc (BUFINCR);
 292         last_dst = buf;         /* XXX */
 293         bufsiz = BUFINCR - 6;  /* leave some slop */
 294         bufend = buf + bufsiz;
 295     }
 296     /*
 297      * If "orig" points to our buffer we can just pick up where we
 298      * left off.  Otherwise we have to copy orig into our buffer.
 299      */
 300     if (orig == buf)
 301         dst = last_dst;
 302     else if (!orig || !*orig) {
 303         dst = buf;
 304         *dst = '\0';
 305     } else {
 306         dst = last_dst;         /* XXX */
 307         CHECKMEM (orig);
 308         CPY (orig);
 309     }
 310
 311     /* concatenate all the new addresses onto 'buf' */
 312     for (isgroup = 0; (cp = getname (str)); ) {
 313         if ((mp = getm (cp, dfhost, dftype, AD_NAME, error)) == NULL) {
 314             snprintf (baddr, sizeof(baddr), "\t%s -- %s\n", cp, error);
 315             badaddrs = add (baddr, badaddrs);
 316             continue;
 317         }
 318         if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
 319             *dst++ = ';';
 320             isgroup = 0;
 321         }
 322         if (insert (mp)) {
 323             /* if we get here we're going to add an address */
 324             if (dst != buf) {
 325                 *dst++ = ',';
 326                 *dst++ = ' ';
 327             }
 328             if (mp->m_gname) {
 329                 CHECKMEM (mp->m_gname);
 330                 CPY (mp->m_gname);
 331                 isgroup++;
 332             }
 333             sp = adrformat (mp);
 334             CHECKMEM (sp);
 335             CPY (sp);
 336         }
 337     }
 338
 339     if (isgroup)
 340         *dst++ = ';';
 341
 342     *dst = '\0';
 343     last_dst = dst;
 344     return (buf);
 345 }
 346
 347
 348 /*
 349  * fmt_scan will call this routine if the user includes the function
 350  * "(concataddr {component})" in a format string.  This behaves exactly
 351  * like formataddr, except that it does NOT suppress duplicate addresses
 352  * between calls.
 353  *
 354  * As an implementation detail: I thought about splitting out formataddr()
 355  * into the generic part and duplicate-suppressing part, but the call to
 356  * insert() was buried deep within a couple of loops and I didn't see a
 357  * way to do it easily.  So instead we simply set a special flag to stop
 358  * the duplicate check and call formataddr().
 359  */
 360 char *
 361 concataddr(char *orig, char *str)
 362 {
 363     char *cp;
 364
 365     nodupcheck = 1;
 366     cp = formataddr(orig, str);
 367     nodupcheck = 0;
 368     return cp;
 369 }
 370
 371 static int
 372 insert (struct mailname *np)
 373 {
 374     char buffer[BUFSIZ];
 375     register struct mailname *mp;
 376
 377     if (nodupcheck)
 378         return 1;
 379
 380     if (np->m_mbox == NULL)
 381         return 0;
 382
 383     for (mp = &mq; mp->m_next; mp = mp->m_next) {
 384         if (!mh_strcasecmp (np->m_host, mp->m_next->m_host)
 385                 && !mh_strcasecmp (np->m_mbox, mp->m_next->m_mbox))
 386             return 0;
 387     }
 388     if (!ccme && ismymbox (np))
 389         return 0;
 390
 391     if (querysw) {
 392         snprintf (buffer, sizeof(buffer), "Reply to %s? ", adrformat (np));
 393         if (!gans (buffer, anoyes))
 394         return 0;
 395     }
 396     mp->m_next = np;
 397
 398     return 1;
 399 }
 400
 401
 402 /*
 403  * Call the mhlproc
 404  *
 405  * This function expects that argument out has been fflushed by the caller.
 406  */
 407
 408 static void
 409 replfilter (FILE *in, FILE *out, char *filter, int fmtproc)
 410 {
 411     int pid;
 412     char *mhl;
 413     char *errstr;
 414     char **arglist;
 415     int argnum;
 416
 417     if (filter == NULL)
 418         return;
 419
 420     if (access (filter, R_OK) == NOTOK)
 421         adios (filter, "unable to read");
 422
 423     rewind (in);
 424     lseek (fileno(in), (off_t) 0, SEEK_SET);
 425
 426     switch (pid = fork()) {
 427         case NOTOK:
 428             adios ("fork", "unable to");
 429
 430         case OK:
 431             dup2 (fileno (in), fileno (stdin));
 432             dup2 (fileno (out), fileno (stdout));
 433             closefds (3);
 434
 435             /*
 436              * We're not allocating the memory for the extra arguments,
 437              * because we never call arglist_free().  But if we ever change
 438              * that be sure to use getcpy() for the extra arguments.
 439              */
 440             arglist = argsplit(mhlproc, &mhl, &argnum);
 441             arglist[argnum++] = "-form";
 442             arglist[argnum++] = filter;
 443             arglist[argnum++] = "-noclear";
 444
 445             switch (fmtproc) {
 446             case 1:
 447                 arglist[argnum++] = "-fmtproc";
 448                 arglist[argnum++] = formatproc;
 449                 break;
 450             case 0:
 451                 arglist[argnum++] = "-nofmtproc";
 452                 break;
 453             }
 454
 455             arglist[argnum++] = NULL;
 456
 457             execvp (mhl, arglist);
 458             errstr = strerror(errno);
 459             write(2, "unable to exec ", 15);
 460             write(2, mhlproc, strlen(mhlproc));
 461             write(2, ": ", 2);
 462             write(2, errstr, strlen(errstr));
 463             write(2, "\n", 1);
 464             _exit (-1);
 465
 466         default:
 467             if (pidXwait (pid, mhl))
 468                 done (1);
 469             fseek (out, 0L, SEEK_END);
 470             break;
 471     }
 472 }