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tcp.c

/*
 * Copyright (C) 2008-2009 Stig Venaas <venaas@uninett.no>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 */

#include <signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#ifdef SYS_SOLARIS9
#include <fcntl.h>
#endif
#include <sys/time.h>
#include <sys/types.h>
#include <sys/select.h>
#include <ctype.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <regex.h>
#include <pthread.h>
#include "list.h"
#include "hostport.h"
#include "radsecproxy.h"

#ifdef RADPROT_TCP
#include "debug.h"
#include "util.h"
static void setprotoopts(struct commonprotoopts *opts);
static char **getlistenerargs();
void *tcplistener(void *arg);
int tcpconnect(struct server *server, struct timeval *when, int timeout, char * text);
void *tcpclientrd(void *arg);
int clientradputtcp(struct server *server, unsigned char *rad);
void tcpsetsrcres();

static const struct protodefs protodefs = {
    "tcp",
    NULL, /* secretdefault */
    SOCK_STREAM, /* socktype */
    "1812", /* portdefault */
    0, /* retrycountdefault */
    0, /* retrycountmax */
    REQUEST_RETRY_INTERVAL * REQUEST_RETRY_COUNT, /* retryintervaldefault */
    60, /* retryintervalmax */
    DUPLICATE_INTERVAL, /* duplicateintervaldefault */
    setprotoopts, /* setprotoopts */
    getlistenerargs, /* getlistenerargs */
    tcplistener, /* listener */
    tcpconnect, /* connecter */
    tcpclientrd, /* clientconnreader */
    clientradputtcp, /* clientradput */
    NULL, /* addclient */
    NULL, /* addserverextra */
    tcpsetsrcres, /* setsrcres */
    NULL /* initextra */
};

static struct addrinfo *srcres = NULL;
static uint8_t handle;
static struct commonprotoopts *protoopts = NULL;
const struct protodefs *tcpinit(uint8_t h) {
    handle = h;
    return &protodefs;
}

static void setprotoopts(struct commonprotoopts *opts) {
    protoopts = opts;
}

static char **getlistenerargs() {
    return protoopts ? protoopts->listenargs : NULL;
}

void tcpsetsrcres() {
    if (!srcres)
      srcres = resolvepassiveaddrinfo(protoopts ? protoopts->sourcearg : NULL, NULL, protodefs.socktype);
}

int tcpconnect(struct server *server, struct timeval *when, int timeout, char *text) {
    struct timeval now;
    time_t elapsed;

    debug(DBG_DBG, "tcpconnect: called from %s", text);
    pthread_mutex_lock(&server->lock);
    if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) {
      /* already reconnected, nothing to do */
      debug(DBG_DBG, "tcpconnect(%s): seems already reconnected", text);
      pthread_mutex_unlock(&server->lock);
      return 1;
    }

    for (;;) {
      gettimeofday(&now, NULL);
      elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
      if (timeout && server->lastconnecttry.tv_sec && elapsed > timeout) {
          debug(DBG_DBG, "tcpconnect: timeout");
          if (server->sock >= 0)
            close(server->sock);
          pthread_mutex_unlock(&server->lock);
          return 0;
      }
      if (server->connectionok) {
          server->connectionok = 0;
          sleep(2);
      } else if (elapsed < 1)
          sleep(2);
      else if (elapsed < 60) {
          debug(DBG_INFO, "tcpconnect: sleeping %lds", elapsed);
          sleep(elapsed);
      } else if (elapsed < 100000) {
          debug(DBG_INFO, "tcpconnect: sleeping %ds", 60);
          sleep(60);
      } else
          server->lastconnecttry.tv_sec = now.tv_sec;  /* no sleep at startup */

      if (server->sock >= 0)
          close(server->sock);
      if ((server->sock = connecttcphostlist(server->conf->hostports, srcres)) >= 0)
          break;
    }
    server->connectionok = 1;
    gettimeofday(&server->lastconnecttry, NULL);
    pthread_mutex_unlock(&server->lock);
    return 1;
}

/* timeout in seconds, 0 means no timeout (blocking), returns when num bytes have been read, or timeout */
/* returns 0 on timeout, -1 on error and num if ok */
int tcpreadtimeout(int s, unsigned char *buf, int num, int timeout) {
    int ndesc, cnt, len;
    fd_set readfds, writefds;
    struct timeval timer;

    if (s < 0)
      return -1;
    /* make socket non-blocking? */
    for (len = 0; len < num; len += cnt) {
      FD_ZERO(&readfds);
      FD_SET(s, &readfds);
      writefds = readfds;
      if (timeout) {
          timer.tv_sec = timeout;
          timer.tv_usec = 0;
      }
      ndesc = select(s + 1, &readfds, &writefds, NULL, timeout ? &timer : NULL);
      if (ndesc < 1)
          return ndesc;

      cnt = read(s, buf + len, num - len);
      if (cnt <= 0)
          return -1;
    }
    return num;
}

/* timeout in seconds, 0 means no timeout (blocking) */
unsigned char *radtcpget(int s, int timeout) {
    int cnt, len;
    unsigned char buf[4], *rad;

    for (;;) {
      cnt = tcpreadtimeout(s, buf, 4, timeout);
      if (cnt < 1) {
          debug(DBG_DBG, cnt ? "radtcpget: connection lost" : "radtcpget: timeout");
          return NULL;
      }

      len = RADLEN(buf);
      rad = malloc(len);
      if (!rad) {
          debug(DBG_ERR, "radtcpget: malloc failed");
          continue;
      }
      memcpy(rad, buf, 4);

      cnt = tcpreadtimeout(s, rad + 4, len - 4, timeout);
      if (cnt < 1) {
          debug(DBG_DBG, cnt ? "radtcpget: connection lost" : "radtcpget: timeout");
          free(rad);
          return NULL;
      }

      if (len >= 20)
          break;

      free(rad);
      debug(DBG_WARN, "radtcpget: packet smaller than minimum radius size");
    }

    debug(DBG_DBG, "radtcpget: got %d bytes", len);
    return rad;
}

int clientradputtcp(struct server *server, unsigned char *rad) {
    int cnt;
    size_t len;
    struct clsrvconf *conf = server->conf;

    if (!server->connectionok)
      return 0;
    len = RADLEN(rad);
    if ((cnt = write(server->sock, rad, len)) <= 0) {
      debug(DBG_ERR, "clientradputtcp: write error");
      return 0;
    }
    debug(DBG_DBG, "clientradputtcp: Sent %d bytes, Radius packet of length %d to TCP peer %s", cnt, len, conf->name);
    return 1;
}

void *tcpclientrd(void *arg) {
    struct server *server = (struct server *)arg;
    unsigned char *buf;
    struct timeval lastconnecttry;

    for (;;) {
      /* yes, lastconnecttry is really necessary */
      lastconnecttry = server->lastconnecttry;
      buf = radtcpget(server->sock, 0);
      if (!buf) {
          tcpconnect(server, &lastconnecttry, 0, "tcpclientrd");
          continue;
      }

      replyh(server, buf);
    }
    server->clientrdgone = 1;
    return NULL;
}

void *tcpserverwr(void *arg) {
    int cnt;
    struct client *client = (struct client *)arg;
    struct gqueue *replyq;
    struct request *reply;

    debug(DBG_DBG, "tcpserverwr: starting for %s", addr2string(client->addr));
    replyq = client->replyq;
    for (;;) {
      pthread_mutex_lock(&replyq->mutex);
      while (!list_first(replyq->entries)) {
          if (client->sock >= 0) {
            debug(DBG_DBG, "tcpserverwr: waiting for signal");
            pthread_cond_wait(&replyq->cond, &replyq->mutex);
            debug(DBG_DBG, "tcpserverwr: got signal");
          }
          if (client->sock < 0) {
            /* s might have changed while waiting */
            pthread_mutex_unlock(&replyq->mutex);
            debug(DBG_DBG, "tcpserverwr: exiting as requested");
            pthread_exit(NULL);
          }
      }
      reply = (struct request *)list_shift(replyq->entries);
      pthread_mutex_unlock(&replyq->mutex);
      cnt = write(client->sock, reply->replybuf, RADLEN(reply->replybuf));
      if (cnt > 0)
          debug(DBG_DBG, "tcpserverwr: sent %d bytes, Radius packet of length %d to %s",
              cnt, RADLEN(reply->replybuf), addr2string(client->addr));
      else
          debug(DBG_ERR, "tcpserverwr: write error for %s", addr2string(client->addr));
      freerq(reply);
    }
}

void tcpserverrd(struct client *client) {
    struct request *rq;
    uint8_t *buf;
    pthread_t tcpserverwrth;

    debug(DBG_DBG, "tcpserverrd: starting for %s", addr2string(client->addr));

    if (pthread_create(&tcpserverwrth, NULL, tcpserverwr, (void *)client)) {
      debug(DBG_ERR, "tcpserverrd: pthread_create failed");
      return;
    }

    for (;;) {
      buf = radtcpget(client->sock, 0);
      if (!buf) {
          debug(DBG_ERR, "tcpserverrd: connection from %s lost", addr2string(client->addr));
          break;
      }
      debug(DBG_DBG, "tcpserverrd: got Radius message from %s", addr2string(client->addr));
      rq = newrequest();
      if (!rq) {
          free(buf);
          continue;
      }
      rq->buf = buf;
      rq->from = client;
      if (!radsrv(rq)) {
          debug(DBG_ERR, "tcpserverrd: message authentication/validation failed, closing connection from %s", addr2string(client->addr));
          break;
      }
    }

    /* stop writer by setting s to -1 and give signal in case waiting for data */
    client->sock = -1;
    pthread_mutex_lock(&client->replyq->mutex);
    pthread_cond_signal(&client->replyq->cond);
    pthread_mutex_unlock(&client->replyq->mutex);
    debug(DBG_DBG, "tcpserverrd: waiting for writer to end");
    pthread_join(tcpserverwrth, NULL);
    debug(DBG_DBG, "tcpserverrd: reader for %s exiting", addr2string(client->addr));
}
void *tcpservernew(void *arg) {
    int s;
    struct sockaddr_storage from;
    socklen_t fromlen = sizeof(from);
    struct clsrvconf *conf;
    struct client *client;

    s = *(int *)arg;
    if (getpeername(s, (struct sockaddr *)&from, &fromlen)) {
      debug(DBG_DBG, "tcpservernew: getpeername failed, exiting");
      goto exit;
    }
    debug(DBG_WARN, "tcpservernew: incoming TCP connection from %s", addr2string((struct sockaddr *)&from));

    conf = find_clconf(handle, (struct sockaddr *)&from, NULL);
    if (conf) {
      client = addclient(conf, 1);
      if (client) {
          client->sock = s;
          client->addr = addr_copy((struct sockaddr *)&from);
          tcpserverrd(client);
          removeclient(client);
      } else
          debug(DBG_WARN, "tcpservernew: failed to create new client instance");
    } else
      debug(DBG_WARN, "tcpservernew: ignoring request, no matching TCP client");

exit:
    shutdown(s, SHUT_RDWR);
    close(s);
    pthread_exit(NULL);
}

void *tcplistener(void *arg) {
    pthread_t tcpserverth;
    int s, *sp = (int *)arg;
    struct sockaddr_storage from;
    socklen_t fromlen = sizeof(from);

    listen(*sp, 0);

    for (;;) {
      s = accept(*sp, (struct sockaddr *)&from, &fromlen);
      if (s < 0) {
          debug(DBG_WARN, "accept failed");
          continue;
      }
      if (pthread_create(&tcpserverth, NULL, tcpservernew, (void *)&s)) {
          debug(DBG_ERR, "tcplistener: pthread_create failed");
          shutdown(s, SHUT_RDWR);
          close(s);
          continue;
      }
      pthread_detach(tcpserverth);
    }
    free(sp);
    return NULL;
}
#else
const struct protodefs *tcpinit(uint8_t h) {
    return NULL;
}
#endif

/* Local Variables: */
/* c-file-style: "stroustrup" */
/* End: */

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