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- /*
- * Based on code found at https://dev.openwrt.org/ticket/4876 .
- * Extended by Jo-Philipp Wich <jo@mein.io> for use in OpenWrt.
- *
- * You may use this program under the terms of the GPLv2 license.
- */
- #include <string.h>
- #include <stdio.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netdb.h>
- #include <arpa/inet.h>
- #include <netinet/in.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <signal.h>
- static void abort_query(int sig)
- {
- exit(1);
- }
- static void show_usage(void)
- {
- printf("Usage:\n");
- printf(" resolveip -h\n");
- printf(" resolveip [-t timeout] hostname\n");
- printf(" resolveip -4 [-t timeout] hostname\n");
- printf(" resolveip -6 [-t timeout] hostname\n");
- exit(255);
- }
- int main(int argc, char **argv)
- {
- int timeout = 3;
- int opt;
- char ipaddr[INET6_ADDRSTRLEN];
- void *addr;
- struct addrinfo *res, *rp;
- struct sigaction sa = { .sa_handler = &abort_query };
- struct addrinfo hints = {
- .ai_family = AF_UNSPEC,
- .ai_socktype = SOCK_STREAM,
- .ai_protocol = IPPROTO_TCP,
- .ai_flags = 0
- };
- while ((opt = getopt(argc, argv, "46t:h")) > -1)
- {
- switch ((char)opt)
- {
- case '4':
- hints.ai_family = AF_INET;
- break;
- case '6':
- hints.ai_family = AF_INET6;
- break;
- case 't':
- timeout = atoi(optarg);
- if (timeout <= 0)
- show_usage();
- break;
- case 'h':
- show_usage();
- break;
- }
- }
- if (!argv[optind])
- show_usage();
- sigaction(SIGALRM, &sa, NULL);
- alarm(timeout);
- if (getaddrinfo(argv[optind], NULL, &hints, &res))
- exit(2);
- for (rp = res; rp != NULL; rp = rp->ai_next)
- {
- addr = (rp->ai_family == AF_INET)
- ? (void *)&((struct sockaddr_in *)rp->ai_addr)->sin_addr
- : (void *)&((struct sockaddr_in6 *)rp->ai_addr)->sin6_addr
- ;
- if (!inet_ntop(rp->ai_family, addr, ipaddr, INET6_ADDRSTRLEN - 1))
- exit(3);
- printf("%s\n", ipaddr);
- }
- freeaddrinfo(res);
- exit(0);
- }
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