source: branches/3.2/mindi-busybox/networking/udhcp/socket.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 3.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * DHCP server client/server socket creation
4 *
5 * udhcp client/server
6 * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
7 *          Chris Trew <ctrew@moreton.com.au>
8 *
9 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25#include "common.h"
26#include <net/if.h>
27
28int FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac)
29{
30    /* char buffer instead of bona-fide struct avoids aliasing warning */
31    char ifr_buf[sizeof(struct ifreq)];
32    struct ifreq *const ifr = (void *)ifr_buf;
33
34    int fd;
35    struct sockaddr_in *our_ip;
36
37    memset(ifr, 0, sizeof(*ifr));
38    fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
39
40    ifr->ifr_addr.sa_family = AF_INET;
41    strncpy_IFNAMSIZ(ifr->ifr_name, interface);
42    if (nip) {
43        if (ioctl_or_perror(fd, SIOCGIFADDR, ifr,
44            "is interface %s up and configured?", interface)
45        ) {
46            close(fd);
47            return -1;
48        }
49        our_ip = (struct sockaddr_in *) &ifr->ifr_addr;
50        *nip = our_ip->sin_addr.s_addr;
51        log1("IP %s", inet_ntoa(our_ip->sin_addr));
52    }
53
54    if (ifindex) {
55        if (ioctl_or_warn(fd, SIOCGIFINDEX, ifr) != 0) {
56            close(fd);
57            return -1;
58        }
59        log1("Adapter index %d", ifr->ifr_ifindex);
60        *ifindex = ifr->ifr_ifindex;
61    }
62
63    if (mac) {
64        if (ioctl_or_warn(fd, SIOCGIFHWADDR, ifr) != 0) {
65            close(fd);
66            return -1;
67        }
68        memcpy(mac, ifr->ifr_hwaddr.sa_data, 6);
69        log1("MAC %02x:%02x:%02x:%02x:%02x:%02x",
70            mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
71    }
72
73    close(fd);
74    return 0;
75}
76
77/* 1. None of the callers expects it to ever fail */
78/* 2. ip was always INADDR_ANY */
79int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
80{
81    int fd;
82    struct sockaddr_in addr;
83    char *colon;
84
85    log1("Opening listen socket on *:%d %s", port, inf);
86    fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
87
88    setsockopt_reuseaddr(fd);
89    if (setsockopt_broadcast(fd) == -1)
90        bb_perror_msg_and_die("SO_BROADCAST");
91
92    /* SO_BINDTODEVICE doesn't work on ethernet aliases (ethN:M) */
93    colon = strrchr(inf, ':');
94    if (colon)
95        *colon = '\0';
96
97    if (setsockopt_bindtodevice(fd, inf))
98        xfunc_die(); /* warning is already printed */
99
100    if (colon)
101        *colon = ':';
102
103    memset(&addr, 0, sizeof(addr));
104    addr.sin_family = AF_INET;
105    addr.sin_port = htons(port);
106    /* addr.sin_addr.s_addr = ip; - all-zeros is INADDR_ANY */
107    xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
108
109    return fd;
110}
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