src/util.c

/********************************************************************\
 * This program is free software; you can redistribute it and/or    *
 * modify it under the terms of the GNU General Public License as   *
 * published by the Free Software Foundation; either version 2 of   *
 * the License, or (at your option) any later version.              *
 *                                                                  *
 * This program is distributed in the hope that it will be useful,  *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of   *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    *
 * GNU General Public License for more details.                     *
 *                                                                  *
 * You should have received a copy of the GNU General Public License*
 * along with this program; if not, contact:                        *
 *                                                                  *
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 * 59 Temple Place - Suite 330        Fax:    +1-617-542-2652       *
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 \********************************************************************/

/*
 * $Header: /cvsroot/wifidog/wifidog/src/util.c,v 1.19 2005/03/12 02:02:01 minaguib Exp $
 */
#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <errno.h>
#include <pthread.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/unistd.h>
#include <netinet/in.h>
#include <sys/ioctl.h>

#ifdef __linux__
#include <net/if.h>
#endif

#include <string.h>
#include <pthread.h>
#include <netdb.h>

#include "common.h"
#include "client_list.h"
#include "safe.h"
#include "util.h"
#include "conf.h"
#include "debug.h"

static pthread_mutex_t ghbn_mutex = PTHREAD_MUTEX_INITIALIZER;

/* Defined in ping_thread.c */
extern time_t started_time;

/* Defined in clientlist.c */
extern  pthread_mutex_t client_list_mutex;
extern  pthread_mutex_t config_mutex;

/* XXX Do these need to be locked ? */
static time_t last_online_time = 0;
static time_t last_offline_time = 0;
static time_t last_auth_online_time = 0;
static time_t last_auth_offline_time = 0;

int
execute(char *cmd_line, int quiet)
{
    int pid,
        status,
        rc;

    const char *new_argv[4];
    new_argv[0] = "/bin/sh";
    new_argv[1] = "-c";
    new_argv[2] = cmd_line;
    new_argv[3] = NULL;

    if ((pid = fork()) < 0) {    /* fork a child process           */
        debug(LOG_ERR, "fork(): %s", strerror(errno));
        exit(1);
    } else if (pid == 0) {    /* for the child process:         */
        /* We don't want to see any errors if quiet flag is on */
        if (quiet) close(2);
        if (execvp("/bin/sh", (char *const *)new_argv) < 0) {    /* execute the command  */
            debug(LOG_ERR, "execvp(): %s", strerror(errno));
            exit(1);
        }
    } else {        /* for the parent:      */
        do {
            rc = wait(&status);
        } while (rc != pid && rc != -1);    /* wait for completion  */
    }

    return (WEXITSTATUS(status));
}

struct in_addr *
wd_gethostbyname(const char *name)
{
        struct hostent *he;
        struct in_addr *h_addr, *in_addr_temp;

        /* XXX Calling function is reponsible for free() */

        h_addr = safe_malloc(sizeof(struct in_addr));
        
        LOCK_GHBN();

        he = gethostbyname(name);

        if (he == NULL) {
                free(h_addr);
                UNLOCK_GHBN();
                return NULL;
        }

        mark_online();

        in_addr_temp = (struct in_addr *)he->h_addr_list[0];
        h_addr->s_addr = in_addr_temp->s_addr;
        
        UNLOCK_GHBN();

        return h_addr;
}

char *get_iface_ip(char *ifname) {
#ifdef __linux__
    struct ifreq if_data;
#endif
    struct in_addr in;
    char *ip_str;
    int sockd;
    u_int32_t ip;

#ifdef __linux__
    
    /* Create a socket */
    if ((sockd = socket (AF_INET, SOCK_PACKET, htons(0x8086))) < 0) {
        debug(LOG_ERR, "socket(): %s", strerror(errno));
        return NULL;
    }

    /* Get IP of internal interface */
    strcpy (if_data.ifr_name, ifname);

    /* Get the IP address */
    if (ioctl (sockd, SIOCGIFADDR, &if_data) < 0) {
        debug(LOG_ERR, "ioctl(): SIOCGIFADDR %s", strerror(errno));
        return NULL;
    }
    memcpy ((void *) &ip, (void *) &if_data.ifr_addr.sa_data + 2, 4);
    in.s_addr = ip;

    ip_str = (char *)inet_ntoa(in);
    return safe_strdup(ip_str);
#else
    return safe_strdup("0.0.0.0");
#endif
}

void mark_online() {
        int before;
        int after;

        before = is_online();
        time(&last_online_time);
        after = is_online();

        if (before != after) {
                debug(LOG_INFO, "ONLINE status became %s", (after ? "ON" : "OFF"));
        }

}

void mark_offline() {
        int before;
        int after;

        before = is_online();
        time(&last_offline_time);
        after = is_online();

        if (before != after) {
                debug(LOG_INFO, "ONLINE status became %s", (after ? "ON" : "OFF"));
        }

        /* If we're offline it definately means the auth server is offline */
        mark_auth_offline();

}

int is_online() {
        if (last_online_time == 0 || (last_offline_time - last_online_time) >= (config_get_config()->checkinterval * 2) ) {
                /* We're probably offline */
                return (0);
        }
        else {
                /* We're probably online */
                return (1);
        }
}

void mark_auth_online() {
        int before;
        int after;

        before = is_auth_online();
        time(&last_auth_online_time);
        after = is_auth_online();

        if (before != after) {
                debug(LOG_INFO, "AUTH_ONLINE status became %s", (after ? "ON" : "OFF"));
        }

        /* If auth server is online it means we're definately online */
        mark_online();

}

void mark_auth_offline() {
        int before;
        int after;

        before = is_auth_online();
        time(&last_auth_offline_time);
        after = is_auth_online();

        if (before != after) {
                debug(LOG_INFO, "AUTH_ONLINE status became %s", (after ? "ON" : "OFF"));
        }

}

int is_auth_online() {
        if (!is_online()) {
                /* If we're not online auth is definately not online :) */
                return (0);
        }
        else if (last_auth_online_time == 0 || (last_auth_offline_time - last_auth_online_time) >= (config_get_config()->checkinterval * 2) ) {
                /* Auth is  probably offline */
                return (0);
        }
        else {
                /* Auth is probably online */
                return (1);
        }
}

/*
 * @return A string containing human-readable status text. MUST BE free()d by caller
 */
char * get_status_text() {
        char buffer[STATUS_BUF_SIZ];
        ssize_t len;
        s_config *config;
        t_auth_serv *auth_server;
        t_client        *first;
        int             count;
        unsigned long int uptime = 0;
        unsigned int days = 0, hours = 0, minutes = 0, seconds = 0;
        
        len = 0;
        snprintf(buffer, (sizeof(buffer) - len), "WiFiDog status\n\n");
        len = strlen(buffer);

        uptime = time(NULL) - started_time;
        days    = uptime / (24 * 60 * 60);
        uptime -= days * (24 * 60 * 60);
        hours   = uptime / (60 * 60);
        uptime -= hours * (60 * 60);
        minutes = uptime / 60;
        uptime -= minutes * 60;
        seconds = uptime;

        snprintf((buffer + len), (sizeof(buffer) - len), "Uptime: %ud %uh %um %us\n", days, hours, minutes, seconds);
        len = strlen(buffer);
        
        snprintf((buffer + len), (sizeof(buffer) - len), "is_online: %s\n", (is_online() ? "yes" : "no"));
        len = strlen(buffer);
        
        snprintf((buffer + len), (sizeof(buffer) - len), "is_auth_online: %s\n\n", (is_auth_online() ? "yes" : "no"));
        len = strlen(buffer);

        LOCK_CLIENT_LIST();
        
        first = client_get_first_client();
        
        if (first == NULL) {
                count = 0;
        } else {
                count = 1;
                while (first->next != NULL) {
                        first = first->next;
                        count++;
                }
        }
        
        snprintf((buffer + len), (sizeof(buffer) - len), "%d clients "
                        "connected.\n", count);
        len = strlen(buffer);

        first = client_get_first_client();

        count = 0;
        while (first != NULL) {
                snprintf((buffer + len), (sizeof(buffer) - len), "Client %d\t"
                                "Ip: %s\tMac: %s\tToken: %s\n", count, 
                                first->ip, first->mac, first->token);
                len = strlen(buffer);

                snprintf((buffer + len), (sizeof(buffer) - len), "\tIn: %llu\t"
                                "Out: %llu\n" , first->counters.incoming,
                                first->counters.outgoing);
                len = strlen(buffer);

                count++;
                first = first->next;
        }
        
        UNLOCK_CLIENT_LIST();
    
        snprintf((buffer + len), (sizeof(buffer) - len), "\nAuthentication servers:\n");
        len = strlen(buffer);

        LOCK_CONFIG();

        config = config_get_config();
        for (auth_server = config->auth_servers; auth_server != NULL; auth_server = auth_server->next) {
                snprintf((buffer + len), (sizeof(buffer) - len), "  Host: %s (%s)\n", auth_server->authserv_hostname, auth_server->last_ip);
                len = strlen(buffer);
        }

        UNLOCK_CONFIG();

        return safe_strdup(buffer);
}

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