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- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <errno.h>
- #include <string.h>
- #include <ctype.h>
- #include <sys/ioctl.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <linux/if.h>
- #include <linux/sockios.h>
- #include <arpa/inet.h>
- static void die(const char *s)
- {
- fprintf(stderr,"error: %s (%s)\n", s, strerror(errno));
- exit(-1);
- }
- static void setflags(int s, struct ifreq *ifr, int set, int clr)
- {
- if(ioctl(s, SIOCGIFFLAGS, ifr) < 0) die("SIOCGIFFLAGS");
- ifr->ifr_flags = (ifr->ifr_flags & (~clr)) | set;
- if(ioctl(s, SIOCSIFFLAGS, ifr) < 0) die("SIOCSIFFLAGS");
- }
- static inline void init_sockaddr_in(struct sockaddr_in *sin, const char *addr)
- {
- sin->sin_family = AF_INET;
- sin->sin_port = 0;
- sin->sin_addr.s_addr = inet_addr(addr);
- }
- static void setmtu(int s, struct ifreq *ifr, const char *mtu)
- {
- int m = atoi(mtu);
- ifr->ifr_mtu = m;
- if(ioctl(s, SIOCSIFMTU, ifr) < 0) die("SIOCSIFMTU");
- }
- static void setdstaddr(int s, struct ifreq *ifr, const char *addr)
- {
- init_sockaddr_in((struct sockaddr_in *) &ifr->ifr_dstaddr, addr);
- if(ioctl(s, SIOCSIFDSTADDR, ifr) < 0) die("SIOCSIFDSTADDR");
- }
- static void setnetmask(int s, struct ifreq *ifr, const char *addr)
- {
- init_sockaddr_in((struct sockaddr_in *) &ifr->ifr_netmask, addr);
- if(ioctl(s, SIOCSIFNETMASK, ifr) < 0) die("SIOCSIFNETMASK");
- }
- static void setaddr(int s, struct ifreq *ifr, const char *addr)
- {
- init_sockaddr_in((struct sockaddr_in *) &ifr->ifr_addr, addr);
- if(ioctl(s, SIOCSIFADDR, ifr) < 0) die("SIOCSIFADDR");
- }
- int main(int argc, char *argv[])
- {
- struct ifreq ifr;
- int s;
- unsigned int addr, mask, flags;
- char astring[20];
- char mstring[20];
- char *updown, *brdcst, *loopbk, *ppp, *running, *multi;
-
- argc--;
- argv++;
- if(argc == 0) return 0;
- memset(&ifr, 0, sizeof(struct ifreq));
- strncpy(ifr.ifr_name, argv[0], IFNAMSIZ);
- ifr.ifr_name[IFNAMSIZ-1] = 0;
- argc--, argv++;
- if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
- die("cannot open control socket\n");
- }
- if (argc == 0) {
- if (ioctl(s, SIOCGIFADDR, &ifr) < 0) {
- perror(ifr.ifr_name);
- return -1;
- } else
- addr = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
- if (ioctl(s, SIOCGIFNETMASK, &ifr) < 0) {
- perror(ifr.ifr_name);
- return -1;
- } else
- mask = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
- if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) {
- perror(ifr.ifr_name);
- return -1;
- } else
- flags = ifr.ifr_flags;
- sprintf(astring, "%d.%d.%d.%d",
- addr & 0xff,
- ((addr >> 8) & 0xff),
- ((addr >> 16) & 0xff),
- ((addr >> 24) & 0xff));
- sprintf(mstring, "%d.%d.%d.%d",
- mask & 0xff,
- ((mask >> 8) & 0xff),
- ((mask >> 16) & 0xff),
- ((mask >> 24) & 0xff));
- printf("%s: ip %s mask %s flags [", ifr.ifr_name,
- astring,
- mstring
- );
- updown = (flags & IFF_UP) ? "up" : "down";
- brdcst = (flags & IFF_BROADCAST) ? " broadcast" : "";
- loopbk = (flags & IFF_LOOPBACK) ? " loopback" : "";
- ppp = (flags & IFF_POINTOPOINT) ? " point-to-point" : "";
- running = (flags & IFF_RUNNING) ? " running" : "";
- multi = (flags & IFF_MULTICAST) ? " multicast" : "";
- printf("%s%s%s%s%s%s]\n", updown, brdcst, loopbk, ppp, running, multi);
- return 0;
- }
-
- while(argc > 0) {
- if (!strcmp(argv[0], "up")) {
- setflags(s, &ifr, IFF_UP, 0);
- } else if (!strcmp(argv[0], "mtu")) {
- argc--, argv++;
- if (!argc) {
- errno = EINVAL;
- die("expecting a value for parameter \"mtu\"");
- }
- setmtu(s, &ifr, argv[0]);
- } else if (!strcmp(argv[0], "-pointopoint")) {
- setflags(s, &ifr, IFF_POINTOPOINT, 1);
- } else if (!strcmp(argv[0], "pointopoint")) {
- argc--, argv++;
- if (!argc) {
- errno = EINVAL;
- die("expecting an IP address for parameter \"pointtopoint\"");
- }
- setdstaddr(s, &ifr, argv[0]);
- setflags(s, &ifr, IFF_POINTOPOINT, 0);
- } else if (!strcmp(argv[0], "down")) {
- setflags(s, &ifr, 0, IFF_UP);
- } else if (!strcmp(argv[0], "netmask")) {
- argc--, argv++;
- if (!argc) {
- errno = EINVAL;
- die("expecting an IP address for parameter \"netmask\"");
- }
- setnetmask(s, &ifr, argv[0]);
- } else if (isdigit(argv[0][0])) {
- setaddr(s, &ifr, argv[0]);
- setflags(s, &ifr, IFF_UP, 0);
- }
- argc--, argv++;
- }
- return 0;
- }
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