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00031 #define _GNU_SOURCE
00032
00033 #include <stdio.h>
00034 #include <stdlib.h>
00035 #include <syslog.h>
00036 #include <errno.h>
00037 #include <pthread.h>
00038 #include <sys/wait.h>
00039 #include <sys/types.h>
00040 #include <sys/unistd.h>
00041 #include <netinet/in.h>
00042 #include <sys/ioctl.h>
00043
00044 #ifdef __linux__
00045 #include <net/if.h>
00046 #endif
00047
00048 #include <string.h>
00049 #include <pthread.h>
00050 #include <netdb.h>
00051
00052 #include "common.h"
00053 #include "client_list.h"
00054 #include "safe.h"
00055 #include "util.h"
00056 #include "conf.h"
00057 #include "debug.h"
00058
00059 #include "../config.h"
00060
00061 static pthread_mutex_t ghbn_mutex = PTHREAD_MUTEX_INITIALIZER;
00062
00063
00064 extern time_t started_time;
00065
00066
00067 extern pthread_mutex_t client_list_mutex;
00068 extern pthread_mutex_t config_mutex;
00069
00070
00071 extern pid_t restart_orig_pid;
00072
00073
00074 static time_t last_online_time = 0;
00075 static time_t last_offline_time = 0;
00076 static time_t last_auth_online_time = 0;
00077 static time_t last_auth_offline_time = 0;
00078
00079 long served_this_session = 0;
00080
00086 int
00087 execute(char *cmd_line, int quiet)
00088 {
00089 int pid,
00090 status,
00091 rc;
00092
00093 const char *new_argv[4];
00094 new_argv[0] = "/bin/sh";
00095 new_argv[1] = "-c";
00096 new_argv[2] = cmd_line;
00097 new_argv[3] = NULL;
00098
00099 pid = safe_fork();
00100 if (pid == 0) {
00101
00102 if (quiet) close(2);
00103 if (execvp("/bin/sh", (char *const *)new_argv) < 0) {
00104 debug(LOG_ERR, "execvp(): %s", strerror(errno));
00105 exit(1);
00106 }
00107 }
00108 else {
00109 debug(LOG_DEBUG, "Waiting for PID %d to exit", pid);
00110 rc = waitpid(pid, &status, 0);
00111 debug(LOG_DEBUG, "Process PID %d exited", rc);
00112 }
00113
00114 return (WEXITSTATUS(status));
00115 }
00116
00117 struct in_addr *
00118 wd_gethostbyname(const char *name)
00119 {
00120 struct hostent *he;
00121 struct in_addr *h_addr, *in_addr_temp;
00122
00123
00124
00125 h_addr = safe_malloc(sizeof(struct in_addr));
00126
00127 LOCK_GHBN();
00128
00129 he = gethostbyname(name);
00130
00131 if (he == NULL) {
00132 free(h_addr);
00133 UNLOCK_GHBN();
00134 return NULL;
00135 }
00136
00137 mark_online();
00138
00139 in_addr_temp = (struct in_addr *)he->h_addr_list[0];
00140 h_addr->s_addr = in_addr_temp->s_addr;
00141
00142 UNLOCK_GHBN();
00143
00144 return h_addr;
00145 }
00146
00147 char *get_iface_ip(char *ifname) {
00148 #ifdef __linux__
00149 struct ifreq if_data;
00150 #endif
00151 struct in_addr in;
00152 char *ip_str;
00153 int sockd;
00154 u_int32_t ip;
00155
00156 #ifdef __linux__
00157
00158
00159 if ((sockd = socket (AF_INET, SOCK_PACKET, htons(0x8086))) < 0) {
00160 debug(LOG_ERR, "socket(): %s", strerror(errno));
00161 return NULL;
00162 }
00163
00164
00165 strcpy (if_data.ifr_name, ifname);
00166
00167
00168 if (ioctl (sockd, SIOCGIFADDR, &if_data) < 0) {
00169 debug(LOG_ERR, "ioctl(): SIOCGIFADDR %s", strerror(errno));
00170 return NULL;
00171 }
00172 memcpy ((void *) &ip, (void *) &if_data.ifr_addr.sa_data + 2, 4);
00173 in.s_addr = ip;
00174
00175 ip_str = (char *)inet_ntoa(in);
00176 return safe_strdup(ip_str);
00177 #else
00178 return safe_strdup("0.0.0.0");
00179 #endif
00180 }
00181
00182 char *get_iface_mac (char *ifname) {
00183 #ifdef __linux__
00184 int r, s;
00185 struct ifreq ifr;
00186 char *hwaddr, mac[13];
00187
00188 strcpy(ifr.ifr_name, ifname);
00189
00190 s = socket(PF_INET, SOCK_DGRAM, 0);
00191 if (-1 == s) {
00192 debug(LOG_ERR, "get_iface_mac socket: %s", strerror(errno));
00193 return NULL;
00194 }
00195
00196 r = ioctl(s, SIOCGIFHWADDR, &ifr);
00197 if (r == -1) {
00198 debug(LOG_ERR, "get_iface_mac ioctl(SIOCGIFHWADDR): %s", strerror(errno));
00199 close(s);
00200 return NULL;
00201 }
00202
00203 hwaddr = ifr.ifr_hwaddr.sa_data;
00204 snprintf(mac, 13, "%02X%02X%02X%02X%02X%02X",
00205 hwaddr[0] & 0xFF,
00206 hwaddr[1] & 0xFF,
00207 hwaddr[2] & 0xFF,
00208 hwaddr[3] & 0xFF,
00209 hwaddr[4] & 0xFF,
00210 hwaddr[5] & 0xFF
00211 );
00212
00213 close(s);
00214 return safe_strdup(mac);
00215 #else
00216 return NULL;
00217 #endif
00218 }
00219
00220 char *get_ext_iface (void) {
00221 #ifdef __linux__
00222 FILE *input;
00223 char *device, *gw;
00224 int i;
00225 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
00226 pthread_mutex_t cond_mutex = PTHREAD_MUTEX_INITIALIZER;
00227 struct timespec timeout;
00228 device = (char *)malloc(16);
00229 gw = (char *)malloc(16);
00230 debug(LOG_DEBUG, "get_ext_iface(): Autodectecting the external interface from routing table");
00231 for (i=1; i<=NUM_EXT_INTERFACE_DETECT_RETRY; i++) {
00232 input = fopen("/proc/net/route", "r");
00233 while (!feof(input)) {
00234 fscanf(input, "%s %s %*s %*s %*s %*s %*s %*s %*s %*s %*s\n", device, gw);
00235 if (strcmp(gw, "00000000") == 0) {
00236 free(gw);
00237 debug(LOG_INFO, "get_ext_iface(): Detected %s as the default interface after try %d", device, i);
00238 return device;
00239 }
00240 }
00241 fclose(input);
00242 debug(LOG_ERR, "get_ext_iface(): Failed to detect the external interface after try %d of %d (maybe the interface is not up yet?)", i, NUM_EXT_INTERFACE_DETECT_RETRY);
00243
00244 timeout.tv_sec = time(NULL) + EXT_INTERFACE_DETECT_RETRY_INTERVAL;
00245 timeout.tv_nsec = 0;
00246
00247 pthread_mutex_lock(&cond_mutex);
00248
00249 pthread_cond_timedwait(&cond, &cond_mutex, &timeout);
00250
00251 pthread_mutex_unlock(&cond_mutex);
00252 }
00253 debug(LOG_ERR, "get_ext_iface(): Failed to detect the external interface after %d tries, aborting", NUM_EXT_INTERFACE_DETECT_RETRY);
00254 exit(1);
00255 free(device);
00256 free(gw);
00257 #endif
00258 return NULL;
00259 }
00260
00261 void mark_online() {
00262 int before;
00263 int after;
00264
00265 before = is_online();
00266 time(&last_online_time);
00267 after = is_online();
00268
00269 if (before != after) {
00270 debug(LOG_INFO, "ONLINE status became %s", (after ? "ON" : "OFF"));
00271 }
00272
00273 }
00274
00275 void mark_offline() {
00276 int before;
00277 int after;
00278
00279 before = is_online();
00280 time(&last_offline_time);
00281 after = is_online();
00282
00283 if (before != after) {
00284 debug(LOG_INFO, "ONLINE status became %s", (after ? "ON" : "OFF"));
00285 }
00286
00287
00288 mark_auth_offline();
00289
00290 }
00291
00292 int is_online() {
00293 if (last_online_time == 0 || (last_offline_time - last_online_time) >= (config_get_config()->checkinterval * 2) ) {
00294
00295 return (0);
00296 }
00297 else {
00298
00299 return (1);
00300 }
00301 }
00302
00303 void mark_auth_online() {
00304 int before;
00305 int after;
00306
00307 before = is_auth_online();
00308 time(&last_auth_online_time);
00309 after = is_auth_online();
00310
00311 if (before != after) {
00312 debug(LOG_INFO, "AUTH_ONLINE status became %s", (after ? "ON" : "OFF"));
00313 }
00314
00315
00316 mark_online();
00317
00318 }
00319
00320 void mark_auth_offline() {
00321 int before;
00322 int after;
00323
00324 before = is_auth_online();
00325 time(&last_auth_offline_time);
00326 after = is_auth_online();
00327
00328 if (before != after) {
00329 debug(LOG_INFO, "AUTH_ONLINE status became %s", (after ? "ON" : "OFF"));
00330 }
00331
00332 }
00333
00334 int is_auth_online() {
00335 if (!is_online()) {
00336
00337 return (0);
00338 }
00339 else if (last_auth_online_time == 0 || (last_auth_offline_time - last_auth_online_time) >= (config_get_config()->checkinterval * 2) ) {
00340
00341 return (0);
00342 }
00343 else {
00344
00345 return (1);
00346 }
00347 }
00348
00349
00350
00351
00352 char * get_status_text() {
00353 char buffer[STATUS_BUF_SIZ];
00354 ssize_t len;
00355 s_config *config;
00356 t_auth_serv *auth_server;
00357 t_client *first;
00358 int count;
00359 unsigned long int uptime = 0;
00360 unsigned int days = 0, hours = 0, minutes = 0, seconds = 0;
00361 t_trusted_mac *p;
00362
00363 len = 0;
00364 snprintf(buffer, (sizeof(buffer) - len), "WiFiDog status\n\n");
00365 len = strlen(buffer);
00366
00367 uptime = time(NULL) - started_time;
00368 days = uptime / (24 * 60 * 60);
00369 uptime -= days * (24 * 60 * 60);
00370 hours = uptime / (60 * 60);
00371 uptime -= hours * (60 * 60);
00372 minutes = uptime / 60;
00373 uptime -= minutes * 60;
00374 seconds = uptime;
00375
00376 snprintf((buffer + len), (sizeof(buffer) - len), "Version: " VERSION "\n");
00377 len = strlen(buffer);
00378
00379 snprintf((buffer + len), (sizeof(buffer) - len), "Uptime: %ud %uh %um %us\n", days, hours, minutes, seconds);
00380 len = strlen(buffer);
00381
00382 snprintf((buffer + len), (sizeof(buffer) - len), "Has been restarted: ");
00383 len = strlen(buffer);
00384 if (restart_orig_pid) {
00385 snprintf((buffer + len), (sizeof(buffer) - len), "yes (from PID %d)\n", restart_orig_pid);
00386 len = strlen(buffer);
00387 }
00388 else {
00389 snprintf((buffer + len), (sizeof(buffer) - len), "no\n");
00390 len = strlen(buffer);
00391 }
00392
00393 snprintf((buffer + len), (sizeof(buffer) - len), "Internet Connectivity: %s\n", (is_online() ? "yes" : "no"));
00394 len = strlen(buffer);
00395
00396 snprintf((buffer + len), (sizeof(buffer) - len), "Auth server reachable: %s\n", (is_auth_online() ? "yes" : "no"));
00397 len = strlen(buffer);
00398
00399 snprintf((buffer + len), (sizeof(buffer) - len), "Clients served this session: %lu\n\n", served_this_session);
00400 len = strlen(buffer);
00401
00402 LOCK_CLIENT_LIST();
00403
00404 first = client_get_first_client();
00405
00406 if (first == NULL) {
00407 count = 0;
00408 } else {
00409 count = 1;
00410 while (first->next != NULL) {
00411 first = first->next;
00412 count++;
00413 }
00414 }
00415
00416 snprintf((buffer + len), (sizeof(buffer) - len), "%d clients "
00417 "connected.\n", count);
00418 len = strlen(buffer);
00419
00420 first = client_get_first_client();
00421
00422 count = 0;
00423 while (first != NULL) {
00424 snprintf((buffer + len), (sizeof(buffer) - len), "\nClient %d\n", count);
00425 len = strlen(buffer);
00426
00427 snprintf((buffer + len), (sizeof(buffer) - len), " IP: %s MAC: %s\n", first->ip, first->mac);
00428 len = strlen(buffer);
00429
00430 snprintf((buffer + len), (sizeof(buffer) - len), " Token: %s\n", first->token);
00431 len = strlen(buffer);
00432
00433 snprintf((buffer + len), (sizeof(buffer) - len), " Downloaded: %llu\n Uploaded: %llu\n" , first->counters.incoming, first->counters.outgoing);
00434 len = strlen(buffer);
00435
00436 count++;
00437 first = first->next;
00438 }
00439
00440 UNLOCK_CLIENT_LIST();
00441
00442 config = config_get_config();
00443
00444 if (config->trustedmaclist != NULL) {
00445 snprintf((buffer + len), (sizeof(buffer) - len), "\nTrusted MAC addresses:\n");
00446 len = strlen(buffer);
00447
00448 for (p = config->trustedmaclist; p != NULL; p = p->next) {
00449 snprintf((buffer + len), (sizeof(buffer) - len), " %s\n", p->mac);
00450 len = strlen(buffer);
00451 }
00452 }
00453
00454 snprintf((buffer + len), (sizeof(buffer) - len), "\nAuthentication servers:\n");
00455 len = strlen(buffer);
00456
00457 LOCK_CONFIG();
00458
00459 for (auth_server = config->auth_servers; auth_server != NULL; auth_server = auth_server->next) {
00460 snprintf((buffer + len), (sizeof(buffer) - len), " Host: %s (%s)\n", auth_server->authserv_hostname, auth_server->last_ip);
00461 len = strlen(buffer);
00462 }
00463
00464 UNLOCK_CONFIG();
00465
00466 return safe_strdup(buffer);
00467 }