wdctl_thread.c

00001 /********************************************************************\
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00003  * modify it under the terms of the GNU General Public License as   *
00004  * published by the Free Software Foundation; either version 2 of   *
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00010  * GNU General Public License for more details.                     *
00011  *                                                                  *
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00020 
00021 /* $Id: wdctl_thread.c 969 2006-02-23 17:09:32Z papril $ */
00027 #define _GNU_SOURCE
00028 
00029 #include <stdio.h>
00030 #include <stdlib.h>
00031 #include <pthread.h>
00032 #include <string.h>
00033 #include <stdarg.h>
00034 #include <sys/types.h>
00035 #include <sys/socket.h>
00036 #include <sys/un.h>
00037 #include <unistd.h>
00038 #include <syslog.h>
00039 #include <signal.h>
00040 #include <errno.h>
00041 
00042 #include "common.h"
00043 #include "httpd.h"
00044 #include "util.h"
00045 #include "conf.h"
00046 #include "debug.h"
00047 #include "auth.h"
00048 #include "centralserver.h"
00049 #include "fw_iptables.h"
00050 #include "firewall.h"
00051 #include "client_list.h"
00052 #include "wdctl_thread.h"
00053 
00054 /* Defined in clientlist.c */
00055 extern  pthread_mutex_t client_list_mutex;
00056 extern  pthread_mutex_t config_mutex;
00057 
00058 /* From commandline.c: */
00059 extern char ** restartargv;
00060 static void *thread_wdctl_handler(void *);
00061 static void wdctl_status(int);
00062 static void wdctl_stop(int);
00063 static void wdctl_reset(int, char *);
00064 static void wdctl_restart(int);
00065 
00070 void
00071 thread_wdctl(void *arg)
00072 {
00073         int     sock,
00074                 fd;
00075         char    *sock_name;
00076         struct  sockaddr_un     sa_un;
00077         int result;
00078         pthread_t       tid;
00079     socklen_t len;
00080 
00081         debug(LOG_DEBUG, "Starting wdctl.");
00082 
00083         memset(&sa_un, 0, sizeof(sa_un));
00084         sock_name = (char *)arg;
00085         debug(LOG_DEBUG, "Socket name: %s", sock_name);
00086 
00087         if (strlen(sock_name) > (sizeof(sa_un.sun_path) - 1)) {
00088                 /* TODO: Die handler with logging.... */
00089                 debug(LOG_ERR, "WDCTL socket name too long");
00090                 exit(1);
00091         }
00092         
00093 
00094         debug(LOG_DEBUG, "Creating socket");
00095         sock = socket(PF_UNIX, SOCK_STREAM, 0);
00096 
00097         debug(LOG_DEBUG, "Got server socket %d", sock);
00098 
00099         /* If it exists, delete... Not the cleanest way to deal. */
00100         unlink(sock_name);
00101 
00102         debug(LOG_DEBUG, "Filling sockaddr_un");
00103         strcpy(sa_un.sun_path, sock_name); /* XXX No size check because we
00104                                             * check a few lines before. */
00105         sa_un.sun_family = AF_UNIX;
00106         
00107         debug(LOG_DEBUG, "Binding socket (%s) (%d)", sa_un.sun_path,
00108                         strlen(sock_name));
00109         
00110         /* Which to use, AF_UNIX, PF_UNIX, AF_LOCAL, PF_LOCAL? */
00111         if (bind(sock, (struct sockaddr *)&sa_un, strlen(sock_name) 
00112                                 + sizeof(sa_un.sun_family))) {
00113                 debug(LOG_ERR, "Could not bind control socket: %s",
00114                                 strerror(errno));
00115                 pthread_exit(NULL);
00116         }
00117 
00118         if (listen(sock, 5)) {
00119                 debug(LOG_ERR, "Could not listen on control socket: %s",
00120                                 strerror(errno));
00121                 pthread_exit(NULL);
00122         }
00123 
00124         while (1) {
00125                 memset(&sa_un, 0, sizeof(sa_un));
00126                 if ((fd = accept(sock, (struct sockaddr *)&sa_un, &len)) == -1){
00127                         debug(LOG_ERR, "Accept failed on control socket: %s",
00128                                         strerror(errno));
00129                 } else {
00130                         debug(LOG_DEBUG, "Accepted connection on wdctl socket %d (%s)", fd, sa_un.sun_path);
00131                         result = pthread_create(&tid, NULL, &thread_wdctl_handler, (void *)fd);
00132                         if (result != 0) {
00133                                 debug(LOG_ERR, "FATAL: Failed to create a new thread (wdctl handler) - exiting");
00134                                 termination_handler(0);
00135                         }
00136                         pthread_detach(tid);
00137                 }
00138         }
00139 }
00140 
00141 
00142 static void *
00143 thread_wdctl_handler(void *arg)
00144 {
00145         int     fd,
00146                 done,
00147                 i;
00148         char    request[MAX_BUF];
00149         ssize_t read_bytes,
00150                 len;
00151 
00152         debug(LOG_DEBUG, "Entering thread_wdctl_handler....");
00153 
00154         fd = (int)arg;
00155         
00156         debug(LOG_DEBUG, "Read bytes and stuff from %d", fd);
00157 
00158         /* Init variables */
00159         read_bytes = 0;
00160         done = 0;
00161         memset(request, 0, sizeof(request));
00162         
00163         /* Read.... */
00164         while (!done && read_bytes < (sizeof(request) - 1)) {
00165                 len = read(fd, request + read_bytes,
00166                                 sizeof(request) - read_bytes);
00167 
00168                 /* Have we gotten a command yet? */
00169                 for (i = read_bytes; i < (read_bytes + len); i++) {
00170                         if (request[i] == '\r' || request[i] == '\n') {
00171                                 request[i] = '\0';
00172                                 done = 1;
00173                         }
00174                 }
00175                 
00176                 /* Increment position */
00177                 read_bytes += len;
00178         }
00179 
00180         if (strncmp(request, "status", 6) == 0) {
00181                 wdctl_status(fd);
00182         } else if (strncmp(request, "stop", 4) == 0) {
00183                 wdctl_stop(fd);
00184         } else if (strncmp(request, "reset", 5) == 0) {
00185                 wdctl_reset(fd, (request + 6));
00186         } else if (strncmp(request, "restart", 7) == 0) {
00187                 wdctl_restart(fd);
00188         }
00189 
00190         if (!done) {
00191                 debug(LOG_ERR, "Invalid wdctl request.");
00192                 shutdown(fd, 2);
00193                 close(fd);
00194                 pthread_exit(NULL);
00195         }
00196 
00197         debug(LOG_DEBUG, "Request received: [%s]", request);
00198         
00199         shutdown(fd, 2);
00200         close(fd);
00201         debug(LOG_DEBUG, "Exiting thread_wdctl_handler....");
00202 
00203         return NULL;
00204 }
00205 
00206 static void
00207 wdctl_status(int fd)
00208 {
00209         char * status = NULL;
00210         int len = 0;
00211 
00212         status = get_status_text();
00213         len = strlen(status);
00214 
00215         write(fd, status, len);
00216 
00217         free(status);
00218 }
00219 
00221 static void
00222 wdctl_stop(int fd)
00223 {
00224         pid_t   pid;
00225 
00226         pid = getpid();
00227         kill(pid, SIGINT);
00228 }
00229 
00230 static void
00231 wdctl_restart(int afd)
00232 {
00233         int     sock,
00234                 fd;
00235         char    *sock_name;
00236         struct  sockaddr_un     sa_un;
00237         int result;
00238         s_config * conf = NULL;
00239         t_client * client = NULL;
00240         char * tempstring = NULL;
00241         pid_t pid;
00242         ssize_t written;
00243         socklen_t len;
00244 
00245         conf = config_get_config();
00246 
00247         debug(LOG_NOTICE, "Will restart myself");
00248 
00249         /*
00250          * First, prepare the internal socket
00251          */
00252         memset(&sa_un, 0, sizeof(sa_un));
00253         sock_name = conf->internal_sock;
00254         debug(LOG_DEBUG, "Socket name: %s", sock_name);
00255 
00256         if (strlen(sock_name) > (sizeof(sa_un.sun_path) - 1)) {
00257                 /* TODO: Die handler with logging.... */
00258                 debug(LOG_ERR, "INTERNAL socket name too long");
00259                 return;
00260         }
00261 
00262         debug(LOG_DEBUG, "Creating socket");
00263         sock = socket(PF_UNIX, SOCK_STREAM, 0);
00264 
00265         debug(LOG_DEBUG, "Got internal socket %d", sock);
00266 
00267         /* If it exists, delete... Not the cleanest way to deal. */
00268         unlink(sock_name);
00269 
00270         debug(LOG_DEBUG, "Filling sockaddr_un");
00271         strcpy(sa_un.sun_path, sock_name); /* XXX No size check because we check a few lines before. */
00272         sa_un.sun_family = AF_UNIX;
00273         
00274         debug(LOG_DEBUG, "Binding socket (%s) (%d)", sa_un.sun_path, strlen(sock_name));
00275         
00276         /* Which to use, AF_UNIX, PF_UNIX, AF_LOCAL, PF_LOCAL? */
00277         if (bind(sock, (struct sockaddr *)&sa_un, strlen(sock_name) + sizeof(sa_un.sun_family))) {
00278                 debug(LOG_ERR, "Could not bind internal socket: %s", strerror(errno));
00279                 return;
00280         }
00281 
00282         if (listen(sock, 5)) {
00283                 debug(LOG_ERR, "Could not listen on internal socket: %s", strerror(errno));
00284                 return;
00285         }
00286         
00287         /*
00288          * The internal socket is ready, fork and exec ourselves
00289          */
00290         debug(LOG_DEBUG, "Forking in preparation for exec()...");
00291         pid = safe_fork();
00292         if (pid > 0) {
00293                 /* Parent */
00294 
00295                 /* Wait for the child to connect to our socket :*/
00296                 debug(LOG_DEBUG, "Waiting for child to connect on internal socket");
00297                 if ((fd = accept(sock, (struct sockaddr *)&sa_un, &len)) == -1){
00298                         debug(LOG_ERR, "Accept failed on internal socket: %s", strerror(errno));
00299                         close(sock);
00300                         return;
00301                 }
00302 
00303                 close(sock);
00304 
00305                 debug(LOG_DEBUG, "Received connection from child.  Sending them all existing clients");
00306 
00307                 /* The child is connected. Send them over the socket the existing clients */
00308                 LOCK_CLIENT_LIST();
00309                 client = client_get_first_client();
00310                 while (client) {
00311                         /* Send this client */
00312                         safe_asprintf(&tempstring, "CLIENT|ip=%s|mac=%s|token=%s|fw_connection_state=%u|fd=%d|counters_incoming=%llu|counters_outgoing=%llu|counters_last_updated=%lu\n", client->ip, client->mac, client->token, client->fw_connection_state, client->fd, client->counters.incoming, client->counters.outgoing, client->counters.last_updated);
00313                         debug(LOG_DEBUG, "Sending to child client data: %s", tempstring);
00314                         len = 0;
00315                         while (len != strlen(tempstring)) {
00316                                 written = write(fd, (tempstring + len), strlen(tempstring) - len);
00317                                 if (written == -1) {
00318                                         debug(LOG_ERR, "Failed to write client data to child: %s", strerror(errno));
00319                                         free(tempstring);
00320                                         break;
00321                                 }
00322                                 else {
00323                                         len += written;
00324                                 }
00325                         }
00326                         free(tempstring);
00327                         client = client->next;
00328                 }
00329                 UNLOCK_CLIENT_LIST();
00330 
00331                 close(fd);
00332 
00333                 debug(LOG_INFO, "Sent all existing clients to child.  Committing suicide!");
00334 
00335                 shutdown(afd, 2);
00336                 close(afd);
00337 
00338                 /* Our job in life is done. Commit suicide! */
00339                 wdctl_stop(afd);
00340         }
00341         else {
00342                 /* Child */
00343                 close(sock);
00344                 shutdown(afd, 2);
00345                 close(afd);
00346                 debug(LOG_NOTICE, "Re-executing myself (%s)", restartargv[0]);
00347                 setsid();
00348                 execvp(restartargv[0], restartargv);
00349                 /* If we've reached here the exec() failed - die quickly and silently */
00350                 debug(LOG_ERR, "I failed to re-execute myself: %s", strerror(errno));
00351                 debug(LOG_ERR, "Exiting without cleanup");
00352                 exit(1);
00353         }
00354 
00355 }
00356 
00357 static void
00358 wdctl_reset(int fd, char *arg)
00359 {
00360         t_client        *node;
00361 
00362         debug(LOG_DEBUG, "Entering wdctl_reset...");
00363         
00364         LOCK_CLIENT_LIST();
00365         debug(LOG_DEBUG, "Argument: %s (@%x)", arg, arg);
00366         
00367         /* We get the node or return... */
00368         if ((node = client_list_find_by_ip(arg)) != NULL);
00369         else if ((node = client_list_find_by_mac(arg)) != NULL);
00370         else {
00371                 debug(LOG_DEBUG, "Client not found.");
00372                 UNLOCK_CLIENT_LIST();
00373                 write(fd, "No", 2);
00374                 return;
00375         }
00376 
00377         debug(LOG_DEBUG, "Got node %x.", node);
00378         
00379         /* deny.... */
00380         /* TODO: maybe just deleting the connection is not best... But this
00381          * is a manual command, I don't anticipate it'll be that useful. */
00382         fw_deny(node->ip, node->mac, node->fw_connection_state);
00383         client_list_delete(node);
00384         
00385         UNLOCK_CLIENT_LIST();
00386         
00387         write(fd, "Yes", 3);
00388         
00389         debug(LOG_DEBUG, "Exiting wdctl_reset...");
00390 }

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