init.c

/*
  init.c
  $Id: init.c,v 1.10 2010/12/20 14:12:00 bulkstream Exp $

Copyright (C) 2001-2010 Tomo.M (author).
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. Neither the name of the author nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include <sys/param.h>
#include "srelay.h"

char **str_serv_sock; /* to use tcp_wrappers validation */
int       *serv_sock; /* */
int       serv_sock_ind;

fd_set allsock;
int    maxsock;
int    sig_queue[2];

int serv_init(char *ifs)
{
  struct addrinfo  hints, *res, *res0;
  int    error;
  int    i, dup;
  size_t len;
  char   *line, *h, *p, *q;
  int    s;
  char   hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
  char   tmp_str_serv_sock[NI_MAXHOST+NI_MAXSERV+1];
  const  int on = 1;
  int    new_sock_count = 0;

  if (ifs == NULL || *ifs == '\0') {
    str_serv_sock = malloc(sizeof(char *) * MAX_SOCKS);
    if (str_serv_sock == NULL)
      return -1;
    memset(str_serv_sock, 0, sizeof(char *) * MAX_SOCKS);
    serv_sock = malloc(sizeof(int) * MAX_SOCKS);
    if (serv_sock == NULL)
      return -1;
    for (i = 0; i<MAX_SOCKS; i++) {
      /* initialize socket as -1 */
      serv_sock[i] = -1;
    }
    serv_sock_ind = 0;
    maxsock = 0;
    FD_ZERO(&allsock);
    return(0);
  }

  len = strlen(ifs);
  if (len > NI_MAXHOST + NI_MAXSERV + 1) {
    /* ifs line too long */
    return(-1);
  }
  line = strdup(ifs);
  if (line == NULL) /* malloc failed */
    return(-1);

  h = line;

  if ( *h == '[' ) {    /* Escaped Numeric address */
    h++;
    if ( (q = strchr(h, ']')) == NULL ) {
      /* Escaped address format error */
      free(line);
      return(-1);
    }
    *q = '\0';
    p = q + 1;     /* port assignment may follow */
    if (*p == ':') /* separator */
      p++;
  } else {
    p = strchr(h, ':');
    if (p != NULL) /* a port assignment may followed */
      *p++ = '\0';
  }
  if ( p == NULL || *p == '\0' ) {
    /* set socks default port */
    snprintf(sbuf, sizeof(sbuf), "%d", SOCKS_PORT);
    p = sbuf;
  }

  memset(&hints, 0, sizeof(hints));
  hints.ai_socktype = SOCK_STREAM;
  hints.ai_flags = AI_PASSIVE;
  error = getaddrinfo(*h == '\0' ? NULL : h, p, &hints, &res0);
  free(line);
  if (error) {
    /* getaddrinfo error */
    return(-1);
  }

  for (res = res0; res && serv_sock_ind < MAX_SOCKS; res = res->ai_next) {
    error = getnameinfo(res->ai_addr, res->ai_addrlen,
			hbuf, sizeof(hbuf), sbuf, sizeof(sbuf),
			NI_NUMERICHOST | NI_NUMERICSERV);
    if (error) {
      /* getnameinfo error */
      return(-1);
    }
    strncpy(tmp_str_serv_sock, hbuf, sizeof(hbuf));
    /* replace ':' char to '_' for using str in hosts_access */
    for ( i = 0; i < sizeof(hbuf); i++ ) {
      if (hbuf[i] == ':') {
	hbuf[i] = '_';
      }
    }
    strncat(tmp_str_serv_sock, "_", strlen("_"));
    strncat(tmp_str_serv_sock, sbuf, sizeof(sbuf));
    for ( i = 0, dup = 0; i < serv_sock_ind; i++ ) {
      if ( str_serv_sock[i] != NULL ) {
	if (strncmp(tmp_str_serv_sock, str_serv_sock[i],
		    sizeof(tmp_str_serv_sock)) == 0) {
	  dup++;
	  break;
	}
      }
    }
    if (!dup) {
      s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
      if ( s < 0 ) {
	continue;
      }
      if ( s >= FD_SETSIZE ) {   /* avoid FD_SET overrun */
	close(s);
	continue;
      }
      if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
		     (char *)&on, sizeof on) < 0) {
	perror("setsockopt: SO_REUSEADDR");
	close(s);
	continue;
      }
#ifdef IPV6_V6ONLY
      if (res->ai_family == AF_INET6 &&
	  setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
		     &on, sizeof(on)) < 0) {
	perror("setsockopt: IPV6_V6ONLY");
	close(s);
	continue;
      }
#endif
      if (bind(s, res->ai_addr, res->ai_addrlen) < 0 ) {
	close(s);
	continue;
      }
      if (listen(s, INT_MAX) < 0) {
	close(s);
	continue;
      }
      str_serv_sock[serv_sock_ind] = strdup(tmp_str_serv_sock);
      if (str_serv_sock[serv_sock_ind] == NULL) {
	/* malloc failed */
	close(s);
	continue;
      }
      serv_sock[serv_sock_ind] = s;
      FD_SET(s, &allsock);
      maxsock = MAX(s, maxsock);
      serv_sock_ind++;
      new_sock_count++;
    }
  }

  if (new_sock_count == 0) {
    /* no server socket added this time */
    return(-1);
  }

  return(0);
}

void close_all_serv()
{
  int i;

  for (i = 0; i < serv_sock_ind; i++) {
    if (serv_sock[i] >= 0) {
      FD_CLR(serv_sock[i], &allsock);
      if (maxsock > 1 && serv_sock[i] == maxsock) {
	maxsock--;
      }
      close(serv_sock[i]);
      serv_sock[i] = -1;
    }
    if (str_serv_sock[i] != NULL) {
      free(str_serv_sock[i]);
      str_serv_sock[i] = NULL;
    }
  }
  serv_sock_ind = 0;
}

int queue_init()
{
  if (pipe(sig_queue) != 0) {
    return(-1);
  }
  if (sig_queue[0] > 0) {
    FD_SET(sig_queue[0], &allsock);
    maxsock = MAX(sig_queue[0], maxsock);
  } else {
    return(-1);
  }
  return(0);
}

#if 0
/*
  to test ...
  ./configure
  make init.o
  make util.o
  cc -o test-ini init.o util.o
  ./test-ini 123.123.123.123:1111
*/
int cur_child;
char *pidfile;
int threading;
int pthread_equal(pthread_t x, pthread_t y){return 0;}
pthread_t main_thread;
char *config;
int readconf(FILE *f){return 0;}

int main(int argc, char **argv) {

  int i;

  if (argc > 1) {
    serv_init(NULL);
    serv_init(argv[1]);
  } else {
    fprintf(stderr,"need args\n");
  }
  for (i = 0; i < serv_sock_ind; i++) {
    fprintf(stdout, "%d: %s\n", serv_sock[i], str_serv_sock[i]);
  }
  return(0);
}

#endif