source: MondoRescue/branches/stable/mindi-busybox/networking/udhcp/socket.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.6 KB
Line 
1/*
2 * socket.c -- DHCP server client/server socket creation
3 *
4 * udhcp client/server
5 * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
6 *          Chris Trew <ctrew@moreton.com.au>
7 *
8 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25#include <sys/types.h>
26#include <sys/socket.h>
27#include <sys/ioctl.h>
28#include <netinet/in.h>
29#include <unistd.h>
30#include <string.h>
31#include <arpa/inet.h>
32#include <net/if.h>
33#include <errno.h>
34#include <features.h>
35#if (__GLIBC__ >= 2 && __GLIBC_MINOR >= 1) || defined _NEWLIB_VERSION
36#include <netpacket/packet.h>
37#include <net/ethernet.h>
38#else
39#include <asm/types.h>
40#include <linux/if_packet.h>
41#include <linux/if_ether.h>
42#endif
43
44#include "common.h"
45#include "socket.h"
46
47int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *arp)
48{
49    int fd;
50    struct ifreq ifr;
51    struct sockaddr_in *our_ip;
52
53    memset(&ifr, 0, sizeof(struct ifreq));
54    if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
55        ifr.ifr_addr.sa_family = AF_INET;
56        strcpy(ifr.ifr_name, interface);
57
58        if (addr) {
59            if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
60                our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
61                *addr = our_ip->sin_addr.s_addr;
62                DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
63            } else {
64                LOG(LOG_ERR, "SIOCGIFADDR failed, is the interface up and configured?: %m");
65                close(fd);
66                return -1;
67            }
68        }
69
70        if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
71            DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
72            *ifindex = ifr.ifr_ifindex;
73        } else {
74            LOG(LOG_ERR, "SIOCGIFINDEX failed!: %m");
75            close(fd);
76            return -1;
77        }
78        if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {
79            memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
80            DEBUG(LOG_INFO, "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
81                arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
82        } else {
83            LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %m");
84            close(fd);
85            return -1;
86        }
87    } else {
88        LOG(LOG_ERR, "socket failed!: %m");
89        return -1;
90    }
91    close(fd);
92    return 0;
93}
94
95
96int listen_socket(uint32_t ip, int port, char *inf)
97{
98    struct ifreq interface;
99    int fd;
100    struct sockaddr_in addr;
101    int n = 1;
102
103    DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s", ip, port, inf);
104    if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
105        DEBUG(LOG_ERR, "socket call failed: %m");
106        return -1;
107    }
108
109    memset(&addr, 0, sizeof(addr));
110    addr.sin_family = AF_INET;
111    addr.sin_port = htons(port);
112    addr.sin_addr.s_addr = ip;
113
114    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) {
115        close(fd);
116        return -1;
117    }
118    if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) == -1) {
119        close(fd);
120        return -1;
121    }
122
123    strncpy(interface.ifr_name, inf, IFNAMSIZ);
124    if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,(char *)&interface, sizeof(interface)) < 0) {
125        close(fd);
126        return -1;
127    }
128
129    if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
130        close(fd);
131        return -1;
132    }
133
134    return fd;
135}
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