diplodocus.org Git - nmh/blob - sbr/mts.c

   1
   2 /*
   3  * mts.c -- definitions for the mail transport system
   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>   /* for snprintf() */
  11 #include <h/nmh.h>
  12 #include <h/utils.h>
  13
  14 #define nmhetcdir(file) NMHETCDIR#file
  15
  16 #include <ctype.h>
  17 #include <stdio.h>
  18 #include <h/mts.h>
  19 #include <pwd.h>
  20 #include <sys/socket.h>
  21 #include <netdb.h>
  22
  23 /*
  24  * static prototypes
  25  */
  26 static char *tailor_value (char *);
  27 static void getuserinfo (void);
  28 static const char *get_mtsconf_pathname(void);
  29 static const char *get_mtsuserconf_pathname(void);
  30 static void mts_read_conf_file (FILE *fp);
  31
  32 /*
  33  * *mmdfldir and *uucpldir are the maildrop directories.  If maildrops
  34  * are kept in the user's home directory, then these should be empty
  35  * strings.  In this case, the appropriate ...lfil array should contain
  36  * the name of the file in the user's home directory.  Usually, this is
  37  * something like ".mail".
  38  */
  39
  40 /*
  41  * nmh mail transport interface customization file
  42  */
  43 static char *mtsconf = nmhetcdir(/mts.conf);
  44
  45 static char *localname   = "";
  46 static char *localdomain = "";
  47 static char *systemname  = "";
  48
  49 char *mmdfldir = MAILSPOOL;
  50 char *mmdflfil = "";
  51 char *uucpldir = "/usr/spool/mail";
  52 char *uucplfil = "";
  53
  54 char *mmdlm1 = "\001\001\001\001\n";
  55 char *mmdlm2 = "\001\001\001\001\n";
  56
  57 /* Cache the username, fullname, and mailbox of the user */
  58 static char username[BUFSIZ];
  59 static char fullname[BUFSIZ];
  60 static char localmbox[BUFSIZ];
  61
  62 /*
  63  * MTS specific variables
  64  */
  65 static char *mts_method = "smtp";
  66 int  sm_mts    = MTS_SENDMAIL_SMTP;
  67 char *sendmail = SENDMAILPATH;
  68
  69 /*
  70  * SMTP/POP stuff
  71  */
  72 char *clientname = NULL;
  73 char *servers    = "localhost";
  74 char *pophost    = "";
  75
  76 /*
  77  * Global MailDelivery file
  78  */
  79 char *maildelivery = nmhetcdir(/maildelivery);
  80
  81
  82 /*
  83  * Aliasing Facility (doesn't belong here)
  84  */
  85 int Everyone = NOTOK;
  86 static char *everyone = "-1";
  87 char *NoShell = "";
  88
  89 /*
  90  * Customize the MTS settings for nmh by adjusting
  91  * the file mts.conf in the nmh etc directory.
  92  */
  93
  94 struct bind {
  95     char *keyword;
  96     char **value;
  97 };
  98
  99 static struct bind binds[] = {
 100     { "localname", &localname },
 101     { "localdomain", &localdomain },
 102     { "systemname", &systemname },
 103     { "mmdfldir", &mmdfldir },
 104     { "mmdflfil", &mmdflfil },
 105     { "uucpldir", &uucpldir },
 106     { "uucplfil", &uucplfil },
 107     { "mmdelim1", &mmdlm1 },
 108     { "mmdelim2", &mmdlm2 },
 109     { "mts",      &mts_method },
 110     { "sendmail", &sendmail  },
 111     { "clientname",  &clientname },
 112     { "servers", &servers },
 113     { "pophost", &pophost },
 114
 115     { "maildelivery", &maildelivery },
 116     { "everyone", &everyone },
 117     { "noshell", &NoShell },
 118     { NULL, NULL }
 119 };
 120
 121
 122 /* Convert name of mts method to integer value and store it. */
 123 void
 124 save_mts_method (const char *value) {
 125     if (! mh_strcasecmp (value, "smtp")) {
 126         mts_method = "smtp";
 127         sm_mts = MTS_SMTP;
 128     } else if (! mh_strcasecmp (value, "sendmail/smtp")  ||
 129                ! mh_strcasecmp (value, "sendmail")) {
 130         mts_method = "sendmail/smtp";
 131         sm_mts = MTS_SENDMAIL_SMTP;
 132     } else if (! mh_strcasecmp (value, "sendmail/pipe")) {
 133         mts_method = "sendmail/pipe";
 134         sm_mts = MTS_SENDMAIL_PIPE;
 135     } else {
 136         adios (NULL, "unsupported mts selection \"%s\"", value);
 137     }
 138 }
 139
 140
 141 /*
 142  * Read the configuration file for the nmh interface
 143  * to the mail transport system (MTS).
 144  */
 145
 146 void
 147 mts_init (char *name)
 148 {
 149     const char *cp;
 150     FILE *fp;
 151     static int inited = 0;
 152     NMH_UNUSED (name);
 153
 154     if (inited++ || (fp = fopen (get_mtsconf_pathname(), "r")) == NULL)
 155         return;
 156     mts_read_conf_file(fp);
 157     fclose (fp);
 158
 159     cp = get_mtsuserconf_pathname();
 160     if (cp != NULL &&
 161             ((fp = fopen (get_mtsuserconf_pathname(), "r")) != NULL)) {
 162         mts_read_conf_file(fp);
 163         fclose (fp);
 164     }
 165
 166     Everyone = atoi (everyone);
 167
 168     save_mts_method (mts_method);
 169 }
 170
 171
 172 #define QUOTE   '\\'
 173
 174 /*
 175  * Convert escaped values, malloc some new space,
 176  * and copy string to malloc'ed memory.
 177  */
 178
 179 static char *
 180 tailor_value (char *s)
 181 {
 182     int i, r;
 183     char *bp;
 184     char buffer[BUFSIZ];
 185     size_t len;
 186
 187     for (bp = buffer; *s; bp++, s++) {
 188         if (*s != QUOTE) {
 189             *bp = *s;
 190         } else {
 191             switch (*++s) {
 192                 case 'b': *bp = '\b'; break;
 193                 case 'f': *bp = '\f'; break;
 194                 case 'n': *bp = '\n'; break;
 195                 case 't': *bp = '\t'; break;
 196
 197                 case 0: s--;
 198                 case QUOTE:
 199                     *bp = QUOTE;
 200                     break;
 201
 202                 default:
 203                     if (!isdigit ((unsigned char) *s)) {
 204                         *bp++ = QUOTE;
 205                         *bp = *s;
 206                     }
 207                     r = ((unsigned char) *s) != '0' ? 10 : 8;
 208                     for (i = 0; isdigit ((unsigned char) *s); s++)
 209                         i = i * r + ((unsigned char) *s) - '0';
 210                     s--;
 211                     *bp = toascii (i);
 212                     break;
 213             }
 214         }
 215     }
 216     *bp = 0;
 217
 218     len = strlen (buffer) + 1;
 219     bp = mh_xmalloc (len);
 220     memcpy (bp, buffer, len);
 221
 222     return bp;
 223 }
 224
 225 /*
 226  * Get the fully qualified name of the local host.
 227  *
 228  * If flag is 0, then use anything out of mts.conf (like localname).
 229  * If flag is 1, then only use the "proper" local hostname.
 230  */
 231
 232 char *
 233 LocalName (int flag)
 234 {
 235     static char buffer0[BUFSIZ] = "";
 236     static char buffer1[BUFSIZ] = "";
 237     static char *buffer[] = { buffer0, buffer1 };
 238     char *buf;
 239     struct addrinfo hints, *res;
 240
 241     if (flag < 0 || flag > 1)
 242         return NULL;
 243
 244     buf = buffer[flag];
 245
 246     /* check if we have cached the local name */
 247     if (buf[0])
 248         return buf;
 249
 250     mts_init ("mts");
 251
 252     /* check if the mts.conf file specifies a "localname" */
 253     if (*localname && flag == 0) {
 254         strncpy (buf, localname, sizeof(buffer0));
 255     } else {
 256         memset(buf, 0, sizeof(buffer0));
 257         /* first get our local name */
 258         gethostname (buf, sizeof(buffer0) - 1);
 259         /* now fully qualify our name */
 260
 261         memset(&hints, 0, sizeof(hints));
 262         hints.ai_flags = AI_CANONNAME;
 263         hints.ai_family = PF_UNSPEC;
 264         if (getaddrinfo(buf, NULL, &hints, &res) == 0) {
 265             strncpy(buf, res->ai_canonname, sizeof(buffer0) - 1);
 266             freeaddrinfo(res);
 267         }
 268     }
 269
 270     /*
 271      * If the mts.conf file specifies a "localdomain",
 272      * we append that now.  This should rarely be needed.
 273      */
 274     if (*localdomain) {
 275         strcat (buf, ".");
 276         strcat (buf, localdomain);
 277     }
 278
 279     return buf;
 280 }
 281
 282
 283 /*
 284  * This is only for UUCP mail.  It gets the hostname
 285  * as part of the UUCP "domain".
 286  */
 287
 288 char *
 289 SystemName (void)
 290 {
 291     static char buffer[BUFSIZ] = "";
 292
 293     /* check if we have cached the system name */
 294     if (buffer[0])
 295         return buffer;
 296
 297     mts_init ("mts");
 298
 299     /* check if mts.conf file specifies a "systemname" */
 300     if (*systemname) {
 301         strncpy (buffer, systemname, sizeof(buffer));
 302         return buffer;
 303     }
 304
 305     gethostname (buffer, sizeof(buffer));
 306
 307     return buffer;
 308 }
 309
 310
 311 /*
 312  * Get the username of current user
 313  */
 314
 315 char *
 316 getusername (void)
 317 {
 318     if (username[0] == '\0')
 319         getuserinfo();
 320
 321     return username;
 322 }
 323
 324
 325 /*
 326  * Get full name of current user (typically from GECOS
 327  * field of password file).
 328  */
 329
 330 char *
 331 getfullname (void)
 332 {
 333     if (username[0] == '\0')
 334         getuserinfo();
 335
 336     return fullname;
 337 }
 338
 339
 340 /*
 341  * Get the full local mailbox name.  This is in the form:
 342  *
 343  * User Name <user@name.com>
 344  */
 345
 346 char *
 347 getlocalmbox (void)
 348 {
 349     if (username[0] == '\0')
 350         getuserinfo();
 351
 352     return localmbox;
 353 }
 354
 355 /*
 356  * Find the user's username and full name, and cache them.
 357  */
 358
 359 static void
 360 getuserinfo (void)
 361 {
 362     char *cp, *np;
 363     struct passwd *pw;
 364
 365     if ((pw = getpwuid (getuid ())) == NULL
 366             || pw->pw_name == NULL
 367             || *pw->pw_name == '\0') {
 368         strncpy (username, "unknown", sizeof(username));
 369         snprintf (fullname, sizeof(fullname), "The Unknown User-ID (%d)",
 370                 (int) getuid ());
 371         return;
 372     }
 373
 374
 375     /* username */
 376     /* If there's a Local-Mailbox profile component, try to extract
 377        the username from it.  But don't try very hard, this assumes
 378        the very simple User Name <user@name.com> form.
 379        Note that post(8) and whom(1) use context_foil (), so they
 380        won't see the profile component. */
 381     if ((np = context_find("Local-Mailbox")) != NULL) {
 382         char *left_angle_bracket = strchr (np, '<');
 383         char *at_sign = strchr (np, '@');
 384         char *right_angle_bracket = strchr (np, '>');
 385
 386         strncpy(localmbox, np, sizeof(localmbox));
 387
 388         if (left_angle_bracket  &&  at_sign  &&  right_angle_bracket) {
 389             if (at_sign > left_angle_bracket  &&
 390                 at_sign - left_angle_bracket < BUFSIZ) {
 391                 strncpy(username, left_angle_bracket + 1,
 392                         at_sign - left_angle_bracket - 1);
 393             }
 394         }
 395     }
 396
 397     if (username[0] == '\0') {
 398         strncpy (username, pw->pw_name, sizeof(username));
 399     }
 400
 401     username[sizeof(username) - 1] = '\0';
 402
 403     escape_local_part(username, sizeof(username));
 404
 405
 406     /* fullname */
 407     np = pw->pw_gecos;
 408
 409     /* Get the user's real name from the GECOS field.  Stop once we hit a ',',
 410        which some OSes use to separate other 'finger' information in the GECOS
 411        field, like phone number. */
 412     for (cp = fullname; *np != '\0' && *np != ','; *cp++ = *np++)
 413         continue;
 414     *cp = '\0';
 415
 416     /* The $SIGNATURE environment variable overrides the GECOS field's idea of
 417        your real name. If SIGNATURE isn't set, use the Signature profile
 418        setting if it exists.
 419        Note that post(8) and whom(1) use context_foil (), so they
 420        won't see the profile component. */
 421     if ((cp = getenv ("SIGNATURE")) && *cp)
 422         strncpy (fullname, cp, sizeof(fullname));
 423     else if ((cp = context_find("Signature")))
 424         strncpy (fullname, cp, sizeof(fullname));
 425
 426     fullname[sizeof(fullname) - 1] = '\0';
 427
 428     escape_display_name(fullname, sizeof(fullname));
 429
 430
 431     /* localmbox, if not using Local-Mailbox */
 432     if (localmbox[0] == '\0') {
 433         snprintf(localmbox, sizeof(localmbox), "%s <%s@%s>", fullname,
 434                  username, LocalName(0));
 435     }
 436
 437     localmbox[sizeof(localmbox) - 1] = '\0';
 438 }
 439
 440 static const char*
 441 get_mtsconf_pathname (void)
 442 {
 443     const char *cp = getenv ( "MHMTSCONF" );
 444     if (cp != NULL && *cp != '\0') {
 445         return cp;
 446     }
 447     return mtsconf;
 448 }
 449
 450 static const char*
 451 get_mtsuserconf_pathname (void)
 452 {
 453     const char *cp = getenv ( "MHMTSUSERCONF" );
 454     if (cp != NULL && *cp != '\0') {
 455         return cp;
 456     }
 457     return NULL;
 458 }
 459
 460 static void
 461 mts_read_conf_file (FILE *fp)
 462 {
 463     char *bp, *cp, buffer[BUFSIZ];
 464     struct bind *b;
 465
 466     while (fgets (buffer, sizeof(buffer), fp)) {
 467         if (!(cp = strchr(buffer, '\n')))
 468             break;
 469         *cp = 0;
 470         if (*buffer == '#' || *buffer == '\0')
 471             continue;
 472         if (!(bp = strchr(buffer, ':')))
 473             break;
 474         *bp++ = 0;
 475         while (isspace ((unsigned char) *bp))
 476             *bp++ = 0;
 477
 478         for (b = binds; b->keyword; b++)
 479             if (!strcmp (buffer, b->keyword))
 480                 break;
 481         if (b->keyword && (cp = tailor_value (bp)))
 482             *b->value = cp;
 483     }
 484 }