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- /*
- * $Id: resolve.c,v 1.2 1999/05/27 02:32:19 dugsong Exp $
- *
- * libnet
- * resolve.c - various name resolution type routines
- *
- * Copyright (c) 1998, 1999 Mike D. Schiffman <mike@infonexus.com>
- * route|daemon9 <route@infonexus.com>
- * 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.
- *
- * 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.
- *
- */
-
- #if (HAVE_CONFIG_H)
- #include "../include/config.h"
- #endif
- #include "../include/libnet.h"
-
- u_char *
- host_lookup(u_long in, u_short use_name)
- {
- static u_char hostname[512], hostname2[512];
- static u_short which;
- u_char *p;
-
- struct hostent *host_ent = NULL;
- struct in_addr addr;
-
- /*
- * Swap to the other buffer. We swap static buffers to avoid having to
- * pass in a char *. This makes the code that calls this function more
- * intuitive, but makes this function ugly. This function is seriously
- * non-reentrant. For threaded applications (or for signal handler code)
- * use host_lookup_r().
- */
- which++;
-
- if (use_name)
- {
- addr.s_addr = in;
- host_ent = gethostbyaddr((char *)&addr, sizeof(struct in_addr), AF_INET);
- }
- if (!host_ent)
- {
-
- p = (u_char *)∈
- sprintf(((which % 2) ? hostname : hostname2), "%d.%d.%d.%d",
- (p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255));
- }
- else if (use_name)
- {
- strncpy(((which % 2) ? hostname : hostname2), host_ent->h_name,
- sizeof(hostname));
- }
- return (which % 2) ? (hostname) : (hostname2);
- }
-
-
- void
- host_lookup_r(u_long in, u_short use_name, u_char *hostname)
- {
- u_char *p;
- struct hostent *host_ent = NULL;
- struct in_addr addr;
-
- if (use_name)
- {
- addr.s_addr = in;
- host_ent = gethostbyaddr((char *)&addr, sizeof(struct in_addr), AF_INET);
- }
- if (!host_ent)
- {
-
- p = (u_char *)∈
- sprintf(hostname, "%d.%d.%d.%d",
- (p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255));
- }
- else
- {
- /* XXX - sizeof(hostname) == 4 bytes you moron. FIX THAT. - r */
- strncpy(hostname, host_ent->h_name, sizeof(hostname));
- }
- }
-
-
- u_long
- name_resolve(u_char *host_name, u_short use_name)
- {
- struct in_addr addr;
- struct hostent *host_ent;
- u_long l;
- u_int val;
- int i;
-
- if (use_name)
- {
- if ((addr.s_addr = inet_addr(host_name)) == -1)
- {
- if (!(host_ent = gethostbyname(host_name))) return (-1);
- memcpy((char *)&addr.s_addr, host_ent->h_addr, host_ent->h_length);
- }
- return (addr.s_addr);
- }
- else
- {
- /*
- * We only want dots 'n decimals.
- */
- if (!isdigit(host_name[0])) return (-1L);
-
- l = 0;
- for (i = 0; i < 4; i++)
- {
- l <<= 8;
- if (*host_name)
- {
- val = 0;
- while (*host_name && *host_name != '.')
- {
- val *= 10;
- val += *host_name - '0';
- if (val > 255) return (-1L);
- host_name++;
- }
- l |= val;
- if (*host_name) host_name++;
- }
- }
- return (htonl(l));
- }
- }
-
-
- u_long
- get_ipaddr(struct link_int *l, const u_char *device, char *ebuf)
- {
- struct ifreq ifr;
- register struct sockaddr_in *sin;
- int fd;
-
- /*
- * Create dummy socket to perform an ioctl upon.
- */
- fd = socket(PF_INET, SOCK_DGRAM, 0);
- if (fd < 0)
- {
- sprintf(ebuf, "socket: %s", strerror(errno));
- return (0);
- }
-
- memset(&ifr, 0, sizeof(ifr));
- sin = (struct sockaddr_in *)&ifr.ifr_addr;
- strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
-
- ifr.ifr_addr.sa_family = AF_INET;
-
- if (ioctl(fd, SIOCGIFADDR, (char*) &ifr) < 0)
- {
- close(fd);
- return(0);
- }
- close(fd);
- return (ntohl(sin->sin_addr.s_addr));
- }
-
- #if (RAW_IS_COOKED)
- u_long
- libnet_get_interface_by_dest(u_long dest, char *ebuf)
- {
- int fd, len;
-
- struct sockaddr_in destsin;
- struct sockaddr_in resultsin;
-
- memset(&destsin,0,sizeof(destsin));
-
- destsin.sin_family=AF_INET;
- destsin.sin_port=4096;
- destsin.sin_addr.s_addr=dest;
-
- fd=socket(PF_INET, SOCK_DGRAM, 0);
- if (fd < 0)
- {
- sprintf(ebuf, "socket: %s", strerror(errno));
- return (0);
- }
-
- if (connect(fd,(struct sockaddr *)&destsin,sizeof destsin)==-1)
- {
- sprintf(ebuf, "connect: %s", strerror(errno));
- close(fd);
- return (0);
- }
-
- len=sizeof(resultsin);
- if (getsockname(fd,(struct sockaddr *)&resultsin,&len)==-1)
- {
- sprintf(ebuf, "getsockname: %s", strerror(errno));
- close(fd);
- return (0);
- }
-
- close(fd);
-
- return ntohl(resultsin.sin_addr.s_addr);
- }
- #endif /* RAW_IS_COOKED */
- /*
- * get_hwaddr routine moved to arch specifc files (sockpacket.c, bpf.c, etc)
- */
-
- /* EOF */
-