linux下獲取本機IPv6地址、字首、閘道器
阿新 • • 發佈：2018-11-05
獲取本機IPv6資訊命令：cat /proc/net/if_inet6
[email protected]:/home/user1/# cat /proc/net/if_inet6
fe80000000000000922b34fffe4e70f4 02 40 20 80 eth0
20010f80075400000000000000000050 02 40 00 80 eth0
00000000000000000000000000000001 01 80 10 80 lo
獲取本機IPv6閘道器命令：ip -6 route show dev eth0
[email protected]:/home/user1/# ip -6 route show dev eth0 2001:f80:754::/64 proto kernel metric 256 fe80::/64 proto kernel metric 256 default via 2001:f80:754::1 proto static metric 1
#include <stdio.h> #include <unistd.h> #include <pthread.h> #include <stdlib.h> #include <string.h> #include <sys/prctl.h> #include <sys/param.h> #include <sys/wait.h> #include <errno.h> #include <paths.h> #include <sys/syscall.h> #include <sys/resource.h> #include <net/if.h> #include <netinet/in.h> #include <arpa/inet.h> #include <ifaddrs.h> #include <sys/ioctl.h> #include <sys/types.h> #include <sys/socket.h> #include <net/route.h> #define PROCNET_ROUTE_PATH "/proc/net/route" #define PROCNET_IFINET6_PATH "/proc/net/if_inet6" #define SCOPE_LINK_STR "fe80" int net_get_ipv6_ifaddr(char type, const char *ifname, char *addr, int length, char *prefix, int length2) { int ret = 0; FILE *fp; char addr6[46] = {0}, dev_name[20] = {0}; char addr6p[8][5]; int length_of_prefix, scope_value, if_flags, if_index; struct sockaddr_in6 sap = {0}; if (!ifname || !addr || length <= 0 || !prefix || length2 <= 0) return -1; fp = fopen(PROCNET_IFINET6_PATH, "r"); if (!fp) return -1; lockf(fileno(fp), F_LOCK, 0); while (fscanf(fp, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n", addr6p[0], addr6p[1], addr6p[2], addr6p[3], addr6p[4], addr6p[5], addr6p[6], addr6p[7], &if_index, &length_of_prefix, &scope_value, &if_flags, dev_name) != EOF) { if (!strcmp(dev_name, ifname)) { sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s", addr6p[0], addr6p[1], addr6p[2], addr6p[3], addr6p[4], addr6p[5], addr6p[6], addr6p[7]); if (strncmp(addr6p[0], SCOPE_LINK_STR, strlen(SCOPE_LINK_STR)) == 0) { //fe80 Scope:Link if (type == 1) { inet_pton(AF_INET6, addr6, &sap.sin6_addr); inet_ntop(AF_INET6, &sap.sin6_addr, addr, length); snprintf(prefix, length2, "%d", length_of_prefix); lockf(fileno(fp), F_ULOCK, 0); fclose(fp); return 0; } } else { //2001 Scope:Global if (type == 0) { inet_pton(AF_INET6, addr6, &sap.sin6_addr); inet_ntop(AF_INET6, &sap.sin6_addr, addr, length); snprintf(prefix, length2, "%d", length_of_prefix); lockf(fileno(fp), F_ULOCK, 0); fclose(fp); return 0; } } } } lockf(fileno(fp), F_ULOCK, 0); fclose(fp); return -1; } int net_get_ipv6_gateway(char type, const char *ifname, char *gateway, int length) { FILE *fp; char buffer[80] = {'\0'}; char path[128] = {'\0'}; char flag = 0; char *dfstr = "default via "; char *p, *q; if (!ifname || !gateway || length <= 0) return -1; //snprintf(path, sizeof(path), "/bin/ip -6 route show dev %s", ifname); snprintf(path, sizeof(path), "ip -6 route show dev %s", ifname);//hi3798 have not /bin/ip fp = popen(path, "r"); if (!fp) return -1; lockf(fileno(fp), F_LOCK, 0); while (fgets(buffer, sizeof(buffer), fp)) { if (!strncmp(buffer, dfstr, strlen(dfstr))) { p = (char *)&buffer[strlen(dfstr)]; if (p) { q = strchr(p, ' '); if (q) { if (type == 1) { if (strncmp(p, SCOPE_LINK_STR, strlen(SCOPE_LINK_STR)) == 0) { snprintf(gateway, (int)(q - p + 1), "%s", p); lockf(fileno(fp), F_ULOCK, 0); pclose(fp); return 0; } } else { snprintf(gateway, (int)(q - p + 1), "%s", p); lockf(fileno(fp), F_ULOCK, 0); pclose(fp); return 0; } } } } } lockf(fileno(fp), F_ULOCK, 0); pclose(fp); return -1; } int net_is_validipv6(const char *hostname) { struct sockaddr_in6 addr; if (!hostname) return -1; if (strchr(hostname, '.')) return -1;//暫時排除::ffff:204.152.189.116 if (inet_pton(AF_INET6, hostname, &addr.sin6_addr) != 1) return -1; return 0; }
int net_ipv4_trans_ipv6(const char *source, char *dest, int length) { if (!source || !dest || length <= 0) return -1; if (strncmp(source, "::ffff:", strlen("::ffff:")) == 0 && strchr(source, '.')) { char ipv4[32] = {0}; snprintf(ipv4, sizeof(ipv4), "%s", source+strlen("::ffff:")); struct in_addr s4 = {0}; if (inet_pton(AF_INET, ipv4, (void*)&s4) != 1) return -1; char s6[4] = {0}; s6[0] = s4.s_addr&0xff; s6[1] = s4.s_addr>>8&0xff; s6[2] = s4.s_addr>>16&0xff; s6[3] = s4.s_addr>>24&0xff; snprintf(dest, length, "::ffff:%x%.2x:%x%.2x", s6[0]&0xff, s6[1]&0xff, s6[2]&0xff, s6[3]&0xff); return 0; } return -1; } int main(int argc, char *argv[]) { int ret = 0; char ipv6[64] = {0}; ret = net_ipv4_trans_ipv6(argv[1], ipv6, sizeof(ipv6)); printf("ret = %d ipv6 = %s\n", ret, ipv6); return ret; }