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;
  73     unsigned char *cp;
  74     static int dat[5];                  /* aux. data for format routine */
  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 (state = FLD;;) {
 135         int msg_count = sizeof tmpbuf;
 136         state = m_getfld (state, 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(state, 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 (state, 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
 180     /*
 181      * if there's a "Subject" component, strip any "Re:"s off it
 182      */
 183     cptr = fmt_findcomp ("subject");
 184     if (cptr && (cp = cptr->c_text)) {
 185         register char *sp = cp;
 186
 187         for (;;) {
 188             while (isspace(*cp))
 189                 cp++;
 190             if(uprf(cp, "re:"))
 191                 cp += 3;
 192             else
 193                 break;
 194             sp = cp;
 195         }
 196         if (sp != cptr->c_text) {
 197             cp = cptr->c_text;
 198             cptr->c_text = getcpy (sp);
 199             free (cp);
 200         }
 201     }
 202     i = format_len + char_read + 256;
 203     scanl = mh_xmalloc ((size_t) i + 2);
 204     dat[0] = 0;
 205     dat[1] = 0;
 206     dat[2] = 0;
 207     dat[3] = outputlinelen;
 208     dat[4] = 0;
 209     fmt_scan (fmt, scanl, i + 1, i, dat);
 210     fputs (scanl, out);
 211     if (badaddrs) {
 212         fputs ("\nrepl: bad addresses:\n", out);
 213         fputs ( badaddrs, out);
 214     }
 215
 216     /*
 217      * Check if we should filter the message
 218      * or add mhn directives
 219      */
 220     if (filter) {
 221         fflush(out);
 222         if (ferror (out))
 223             adios (drft, "error writing");
 224
 225         replfilter (inb, out, filter, fmtproc);
 226     } else if (mime && mp) {
 227             fprintf (out, "#forw [original message] +%s %s\n",
 228                      mp->foldpath, m_name (mp->lowsel));
 229     }
 230
 231     fflush(out);
 232     if (ferror (out))
 233         adios (drft, "error writing");
 234     fclose (out);
 235
 236     /* return dynamically allocated buffers */
 237     free (scanl);
 238     fmt_free(fmt, 1);
 239 }
 240
 241 static char *buf;               /* our current working buffer */
 242 static char *bufend;            /* end of working buffer */
 243 static char *last_dst;          /* buf ptr at end of last call */
 244 static unsigned int bufsiz=0;   /* current size of buf */
 245
 246 #define BUFINCR 512             /* how much to expand buf when if fills */
 247
 248 #define CPY(s) { cp = (s); while ((*dst++ = *cp++)) ; --dst; }
 249
 250 /*
 251  * check if there's enough room in buf for str.
 252  * add more mem if needed
 253  */
 254 #define CHECKMEM(str) \
 255             if ((len = strlen (str)) >= bufend - dst) {\
 256                 int i = dst - buf;\
 257                 int n = last_dst - buf;\
 258                 bufsiz += ((dst + len - bufend) / BUFINCR + 1) * BUFINCR;\
 259                 buf = mh_xrealloc (buf, bufsiz);\
 260                 dst = buf + i;\
 261                 last_dst = buf + n;\
 262                 bufend = buf + bufsiz;\
 263             }
 264
 265
 266 /*
 267  * fmt_scan will call this routine if the user includes the function
 268  * "(formataddr {component})" in a format string.  "orig" is the
 269  * original contents of the string register.  "str" is the address
 270  * string to be formatted and concatenated onto orig.  This routine
 271  * returns a pointer to the concatenated address string.
 272  *
 273  * We try to not do a lot of malloc/copy/free's (which is why we
 274  * don't call "getcpy") but still place no upper limit on the
 275  * length of the result string.
 276  */
 277 char *
 278 formataddr (char *orig, char *str)
 279 {
 280     register int len;
 281     char baddr[BUFSIZ], error[BUFSIZ];
 282     register int isgroup;
 283     register char *dst;
 284     register char *cp;
 285     register char *sp;
 286     register struct mailname *mp = NULL;
 287
 288     /* if we don't have a buffer yet, get one */
 289     if (bufsiz == 0) {
 290         buf = mh_xmalloc (BUFINCR);
 291         last_dst = buf;         /* XXX */
 292         bufsiz = BUFINCR - 6;  /* leave some slop */
 293         bufend = buf + bufsiz;
 294     }
 295     /*
 296      * If "orig" points to our buffer we can just pick up where we
 297      * left off.  Otherwise we have to copy orig into our buffer.
 298      */
 299     if (orig == buf)
 300         dst = last_dst;
 301     else if (!orig || !*orig) {
 302         dst = buf;
 303         *dst = '\0';
 304     } else {
 305         dst = last_dst;         /* XXX */
 306         CHECKMEM (orig);
 307         CPY (orig);
 308     }
 309
 310     /* concatenate all the new addresses onto 'buf' */
 311     for (isgroup = 0; (cp = getname (str)); ) {
 312         if ((mp = getm (cp, dfhost, dftype, AD_NAME, error)) == NULL) {
 313             snprintf (baddr, sizeof(baddr), "\t%s -- %s\n", cp, error);
 314             badaddrs = add (baddr, badaddrs);
 315             continue;
 316         }
 317         if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
 318             *dst++ = ';';
 319             isgroup = 0;
 320         }
 321         if (insert (mp)) {
 322             /* if we get here we're going to add an address */
 323             if (dst != buf) {
 324                 *dst++ = ',';
 325                 *dst++ = ' ';
 326             }
 327             if (mp->m_gname) {
 328                 CHECKMEM (mp->m_gname);
 329                 CPY (mp->m_gname);
 330                 isgroup++;
 331             }
 332             sp = adrformat (mp);
 333             CHECKMEM (sp);
 334             CPY (sp);
 335         }
 336     }
 337
 338     if (isgroup)
 339         *dst++ = ';';
 340
 341     *dst = '\0';
 342     last_dst = dst;
 343     return (buf);
 344 }
 345
 346
 347 /*
 348  * fmt_scan will call this routine if the user includes the function
 349  * "(concataddr {component})" in a format string.  This behaves exactly
 350  * like formataddr, except that it does NOT suppress duplicate addresses
 351  * between calls.
 352  *
 353  * As an implementation detail: I thought about splitting out formataddr()
 354  * into the generic part and duplicate-suppressing part, but the call to
 355  * insert() was buried deep within a couple of loops and I didn't see a
 356  * way to do it easily.  So instead we simply set a special flag to stop
 357  * the duplicate check and call formataddr().
 358  */
 359 char *
 360 concataddr(char *orig, char *str)
 361 {
 362     char *cp;
 363
 364     nodupcheck = 1;
 365     cp = formataddr(orig, str);
 366     nodupcheck = 0;
 367     return cp;
 368 }
 369
 370 static int
 371 insert (struct mailname *np)
 372 {
 373     char buffer[BUFSIZ];
 374     register struct mailname *mp;
 375
 376     if (nodupcheck)
 377         return 1;
 378
 379     if (np->m_mbox == NULL)
 380         return 0;
 381
 382     for (mp = &mq; mp->m_next; mp = mp->m_next) {
 383         if (!mh_strcasecmp (np->m_host, mp->m_next->m_host)
 384                 && !mh_strcasecmp (np->m_mbox, mp->m_next->m_mbox))
 385             return 0;
 386     }
 387     if (!ccme && ismymbox (np))
 388         return 0;
 389
 390     if (querysw) {
 391         snprintf (buffer, sizeof(buffer), "Reply to %s? ", adrformat (np));
 392         if (!gans (buffer, anoyes))
 393         return 0;
 394     }
 395     mp->m_next = np;
 396
 397     return 1;
 398 }
 399
 400
 401 /*
 402  * Call the mhlproc
 403  *
 404  * This function expects that argument out has been fflushed by the caller.
 405  */
 406
 407 static void
 408 replfilter (FILE *in, FILE *out, char *filter, int fmtproc)
 409 {
 410     int pid;
 411     char *mhl;
 412     char *errstr;
 413     char *arglist[7];
 414
 415     if (filter == NULL)
 416         return;
 417
 418     if (access (filter, R_OK) == NOTOK)
 419         adios (filter, "unable to read");
 420
 421     mhl = r1bindex (mhlproc, '/');
 422
 423     rewind (in);
 424     lseek (fileno(in), (off_t) 0, SEEK_SET);
 425
 426     switch (pid = vfork()) {
 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             arglist[0] = mhl;
 436             arglist[1] = "-form";
 437             arglist[2] = filter;
 438             arglist[3] = "-noclear";
 439
 440             switch (fmtproc) {
 441             case 1:
 442                 arglist[4] = "-fmtproc";
 443                 arglist[5] = formatproc;
 444                 arglist[6] = NULL;
 445                 break;
 446             case 0:
 447                 arglist[4] = "-nofmtproc";
 448                 arglist[5] = NULL;
 449                 break;
 450             default:
 451                 arglist[4] = NULL;
 452             }
 453
 454             execvp (mhlproc, arglist);
 455             errstr = strerror(errno);
 456             write(2, "unable to exec ", 15);
 457             write(2, mhlproc, strlen(mhlproc));
 458             write(2, ": ", 2);
 459             write(2, errstr, strlen(errstr));
 460             write(2, "\n", 1);
 461             _exit (-1);
 462
 463         default:
 464             if (pidXwait (pid, mhl))
 465                 done (1);
 466             fseek (out, 0L, SEEK_END);
 467             break;
 468     }
 469 }