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      1 /*
      2 *
      3 * radrealms.c
      4 *
      5 * A pppd plugin which is stacked on top of radius.so.  This plugin
      6 * allows selection of alternate set of servers based on the user's realm.
      7 *
      8 * Author: Ben McKeegan  ben (at) netservers.co.uk
      9 *
     10 * Copyright (C) 2002 Netservers
     11 *
     12 * This plugin may be distributed according to the terms of the GNU
     13 * General Public License, version 2 or (at your option) any later version.
     14 *
     15 */
     16 
     17 static char const RCSID[] =
     18     "$Id: radrealms.c,v 1.2 2004/11/14 07:26:26 paulus Exp $";
     19 
     20 #include "pppd.h"
     21 #include "radiusclient.h"
     22 #include <stdio.h>
     23 #include <string.h>
     24 #include <stdlib.h>
     25 
     26 char pppd_version[] = VERSION;
     27 
     28 char radrealms_config[MAXPATHLEN] = "/etc/radiusclient/realms";
     29 
     30 static option_t Options[] = {
     31     { "realms-config-file", o_string, &radrealms_config },
     32     { NULL }
     33 };
     34 
     35 extern void (*radius_pre_auth_hook)(char const *user,
     36 				    SERVER **authserver,
     37 				    SERVER **acctserver);
     38 
     39 static void
     40 lookup_realm(char const *user,
     41 	     SERVER **authserver,
     42 	     SERVER **acctserver)
     43 {
     44     char *realm;
     45     FILE *fd;
     46     SERVER *accts, *auths, *s;
     47     char buffer[512], *p;
     48     int line = 0;
     49 
     50     auths = (SERVER *) malloc(sizeof(SERVER));
     51     auths->max = 0;
     52     accts = (SERVER *) malloc(sizeof(SERVER));
     53     accts->max = 0;
     54 
     55     realm = strrchr(user, '@');
     56 
     57     if (realm) {
     58 	info("Looking up servers for realm '%s'", realm);
     59     } else {
     60 	info("Looking up servers for DEFAULT realm");
     61     }
     62     if (realm) {
     63 	if (*(++realm) == '\0') {
     64 	    realm = NULL;
     65 	}
     66     }
     67 
     68     if ((fd = fopen(radrealms_config, "r")) == NULL) {
     69 	option_error("cannot open %s", radrealms_config);
     70 	return;
     71     }
     72     info("Reading %s", radrealms_config);
     73 
     74     while ((fgets(buffer, sizeof(buffer), fd) != NULL)) {
     75 	line++;
     76 
     77 	if ((*buffer == '\n') || (*buffer == '#') || (*buffer == '\0'))
     78 	    continue;
     79 
     80 	buffer[strlen(buffer)-1] = '\0';
     81 
     82 	p = strtok(buffer, "\t ");
     83 
     84 	if (p == NULL || (strcmp(p, "authserver") !=0
     85 	    && strcmp(p, "acctserver"))) {
     86 	    fclose(fd);
     87 	    option_error("%s: invalid line %d: %s", radrealms_config,
     88 			 line, buffer);
     89 	    return;
     90 	}
     91 	info("Parsing '%s' entry:", p);
     92 	s = auths;
     93 	if (p[1] == 'c') {
     94 	    s = accts;
     95 	}
     96 	if (s->max >= SERVER_MAX)
     97 	    continue;
     98 
     99 	if ((p = strtok(NULL, "\t ")) == NULL) {
    100 	    fclose(fd);
    101 	    option_error("%s: realm name missing on line %d: %s",
    102 			 radrealms_config, line, buffer);
    103 	    return;
    104 	}
    105 
    106 	if ((realm != NULL && strcmp(p, realm) == 0) ||
    107 	    (realm == NULL && strcmp(p, "DEFAULT") == 0) ) {
    108 	    info(" - Matched realm %s", p);
    109 	    if ((p = strtok(NULL, ":")) == NULL) {
    110 		fclose(fd);
    111 		option_error("%s: server address missing on line %d: %s",
    112 			     radrealms_config, line, buffer);
    113 		return;
    114 	    }
    115 	    s->name[s->max] = strdup(p);
    116 	    info(" - Address is '%s'",p);
    117 	    if ((p = strtok(NULL, "\t ")) == NULL) {
    118 		fclose(fd);
    119 		option_error("%s: server port missing on line %d:  %s",
    120 			     radrealms_config, line, buffer);
    121 		return;
    122 	    }
    123 	    s->port[s->max] = atoi(p);
    124 	    info(" - Port is '%d'", s->port[s->max]);
    125 	    s->max++;
    126 	} else
    127 	    info(" - Skipping realm '%s'", p);
    128     }
    129     fclose(fd);
    130 
    131     if (accts->max)
    132 	*acctserver = accts;
    133 
    134     if (auths->max)
    135 	*authserver = auths;
    136 
    137     return;
    138 }
    139 
    140 void
    141 plugin_init(void)
    142 {
    143     radius_pre_auth_hook = lookup_realm;
    144 
    145     add_options(Options);
    146     info("RADIUS Realms plugin initialized.");
    147 }
    148