radrealms plugin from Ben McKeegan

[ppp.git] / pppd / plugins / radius / radrealms.c

diff --git a/pppd/plugins/radius/radrealms.c b/pppd/plugins/radius/radrealms.c
new file mode 100644 (file)
index 0000000..1690042
--- /dev/null
+++ b/pppd/plugins/radius/radrealms.c
@@ -0,0 +1,146 @@
+/*
+*
+* radrealms.c
+*
+* A pppd plugin which is stacked on top of radius.so.  This plugin
+* allows selection of alternate set of servers based on the user's realm.
+*
+* Author: Ben McKeegan  ben@netservers.co.uk
+*
+* Copyright (C) 2002 Netservers
+*
+* This plugin may be distributed according to the terms of the GNU
+* General Public License, version 2 or (at your option) any later version.
+*
+*/
+
+static char const RCSID[] =
+    "$Id: radrealms.c,v 1.1 2002/10/05 04:35:24 fcusack Exp $";
+
+#include "pppd.h"
+#include "radiusclient.h"
+#include <stdio.h>
+#include <string.h>
+
+char pppd_version[] = VERSION;
+
+char radrealms_config[MAXPATHLEN] = "/etc/radiusclient/realms";
+
+static option_t Options[] = {
+    { "realms-config-file", o_string, &radrealms_config },
+    { NULL }
+};
+
+extern void (*radius_pre_auth_hook)(char const *user,
+                                   SERVER **authserver,
+                                   SERVER **acctserver);
+
+static void
+lookup_realm(char const *user,
+            SERVER **authserver,
+            SERVER **acctserver)
+{
+    char *realm;
+    FILE *fd;
+    SERVER *accts, *auths, *s;
+    char buffer[512], *p;
+    int line, pos;
+    
+    auths = (SERVER *) malloc(sizeof(SERVER));
+    auths->max = 0;
+    accts = (SERVER *) malloc(sizeof(SERVER));
+    accts->max = 0;
+    
+    realm = strrchr(user, '@');
+    
+    if (realm) {
+       info("Looking up servers for realm '%s'", realm);
+    } else {
+       info("Looking up servers for DEFAULT realm");
+    }
+    if (realm) {
+       if (*(++realm) == '\0') {
+           realm = NULL;
+       }
+    }
+    
+    if ((fd = fopen(radrealms_config, "r")) == NULL) {
+       option_error("cannot open %s", radrealms_config);
+       return;
+    } 
+    info("Reading %s", radrealms_config);
+    
+    while ((fgets(buffer, sizeof(buffer), fd) != NULL)) {
+       line++;
+
+       if ((*buffer == '\n') || (*buffer == '#') || (*buffer == '\0'))
+           continue;
+
+       buffer[strlen(buffer)-1] = '\0';
+
+       p = strtok(buffer, "\t ");
+
+       if (p == NULL || (strcmp(p, "authserver") !=0
+           && strcmp(p, "acctserver"))) {
+           fclose(fd);
+           option_error("%s: invalid line %d: %s", radrealms_config,
+                        line, buffer);
+           return;
+       }
+       info("Parsing '%s' entry:", p);
+       s = auths;
+       if (p[1] == 'c') {
+           s = accts;
+       }
+       if (s->max >= SERVER_MAX)
+           continue;
+
+       if ((p = strtok(NULL, "\t ")) == NULL) {
+           fclose(fd);
+           option_error("%s: realm name missing on line %d: %s",
+                        radrealms_config, line, buffer);
+           return;
+       }
+
+       if ((realm != NULL && strcmp(p, realm) == 0) ||
+           (realm == NULL && strcmp(p, "DEFAULT") == 0) ) {
+           info(" - Matched realm %s", p);
+           if ((p = strtok(NULL, ":")) == NULL) {
+               fclose(fd);
+               option_error("%s: server address missing on line %d: %s",
+                            radrealms_config, line, buffer);
+               return;
+           }
+           s->name[s->max] = strdup(p);
+           info(" - Address is '%s'",p);
+           if ((p = strtok(NULL, "\t ")) == NULL) {
+               fclose(fd);
+               option_error("%s: server port missing on line %d:  %s",
+                            radrealms_config, line, buffer);
+               return;
+           }
+           s->port[s->max] = atoi(p);
+           info(" - Port is '%d'", s->port[s->max]);
+           s->max++;
+       } else 
+           info(" - Skipping realm '%s'", p);
+    }
+    fclose(fd);
+
+    if (accts->max)
+       *acctserver = accts;
+
+    if (auths->max)
+       *authserver = auths;
+
+    return;
+}
+
+void
+plugin_init(void)
+{
+    radius_pre_auth_hook = lookup_realm;
+
+    add_options(Options);
+    info("RADIUS Realms plugin initialized.");
+}