/* vi: set sw=4 ts=4: */
/*
- * socket.c -- DHCP server client/server socket creation
+ * DHCP server client/server socket creation
*
* udhcp client/server
* Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#include <netinet/in.h>
-#include <unistd.h>
-#include <string.h>
-#include <arpa/inet.h>
-#include <net/if.h>
-#include <errno.h>
-#include <features.h>
-#if (__GLIBC__ >= 2 && __GLIBC_MINOR >= 1) || defined _NEWLIB_VERSION
-#include <netpacket/packet.h>
-#include <net/ethernet.h>
-#else
-#include <asm/types.h>
-#include <linux/if_packet.h>
-#include <linux/if_ether.h>
-#endif
-
#include "common.h"
-#include "socket.h"
+#include <net/if.h>
-int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *arp)
+int FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac)
{
+ /* char buffer instead of bona-fide struct avoids aliasing warning */
+ char ifr_buf[sizeof(struct ifreq)];
+ struct ifreq *const ifr = (void *)ifr_buf;
+
int fd;
- struct ifreq ifr;
struct sockaddr_in *our_ip;
- memset(&ifr, 0, sizeof(struct ifreq));
- if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
- ifr.ifr_addr.sa_family = AF_INET;
- strcpy(ifr.ifr_name, interface);
+ memset(ifr, 0, sizeof(*ifr));
+ fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
- if (addr) {
- if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
- our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
- *addr = our_ip->sin_addr.s_addr;
- DEBUG("%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
- } else {
- bb_perror_msg("SIOCGIFADDR failed, is the interface up and configured?");
- close(fd);
- return -1;
- }
+ ifr->ifr_addr.sa_family = AF_INET;
+ strncpy_IFNAMSIZ(ifr->ifr_name, interface);
+ if (nip) {
+ if (ioctl_or_perror(fd, SIOCGIFADDR, ifr,
+ "is interface %s up and configured?", interface)
+ ) {
+ close(fd);
+ return -1;
}
+ our_ip = (struct sockaddr_in *) &ifr->ifr_addr;
+ *nip = our_ip->sin_addr.s_addr;
+ log1("IP %s", inet_ntoa(our_ip->sin_addr));
+ }
- if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
- DEBUG("adapter index %d", ifr.ifr_ifindex);
- *ifindex = ifr.ifr_ifindex;
- } else {
- bb_perror_msg("SIOCGIFINDEX failed");
+ if (ifindex) {
+ if (ioctl_or_warn(fd, SIOCGIFINDEX, ifr) != 0) {
close(fd);
return -1;
}
- if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {
- memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
- DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
- arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
- } else {
- bb_perror_msg("SIOCGIFHWADDR failed");
+ log1("Adapter index %d", ifr->ifr_ifindex);
+ *ifindex = ifr->ifr_ifindex;
+ }
+
+ if (mac) {
+ if (ioctl_or_warn(fd, SIOCGIFHWADDR, ifr) != 0) {
close(fd);
return -1;
}
- } else {
- bb_perror_msg("socket failed");
- return -1;
+ memcpy(mac, ifr->ifr_hwaddr.sa_data, 6);
+ log1("MAC %02x:%02x:%02x:%02x:%02x:%02x",
+ mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}
+
close(fd);
return 0;
}
-
-int listen_socket(uint32_t ip, int port, char *inf)
+/* 1. None of the callers expects it to ever fail */
+/* 2. ip was always INADDR_ANY */
+int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
{
- struct ifreq interface;
int fd;
struct sockaddr_in addr;
- int n = 1;
- DEBUG("Opening listen socket on 0x%08x:%d %s", ip, port, inf);
- if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
- bb_perror_msg("socket");
- return -1;
- }
+ log1("Opening listen socket on *:%d %s", port, inf);
+ fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+
+ setsockopt_reuseaddr(fd);
+ if (setsockopt_broadcast(fd) == -1)
+ bb_perror_msg_and_die("SO_BROADCAST");
+
+ /* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
+ if (setsockopt_bindtodevice(fd, inf))
+ xfunc_die(); /* warning is already printed */
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
- addr.sin_addr.s_addr = ip;
-
- if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) {
- close(fd);
- return -1;
- }
- if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) == -1) {
- close(fd);
- return -1;
- }
-
- strncpy(interface.ifr_name, inf, IFNAMSIZ);
- if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,(char *)&interface, sizeof(interface)) < 0) {
- close(fd);
- return -1;
- }
-
- if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
- close(fd);
- return -1;
- }
+ /* addr.sin_addr.s_addr = ip; - all-zeros is INADDR_ANY */
+ xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
return fd;
}
projects / oweals / busybox.git / blobdiff