#include <stdio.h> #include <arpa/inet.h> int main() { int i; int ret; struct in6_addr addr6; unsigned long ul1, ul2, ul3, ul0; char str[INET6_ADDRSTRLEN] = {0}; ret = inet_pton(AF_INET6, "ff02::12", &addr6); if (ret != 1) { perror("inet_pton()"); return -1; } for (i = 0; i < 1000000; i++) { ul3 = addr6.s6_addr32[3]; ul2 = addr6.s6_addr32[2]; ul1 = addr6.s6_addr32[1]; ul0 = addr6.s6_addr32[0]; ul3 = ntohl(ul3)+1; if (ul3) { goto u3; } ul2 = ntohl(ul2)+1; if (ul2) { goto u2; } ul1 = ntohl(ul1)+1; if (ul1) { goto u1; } ul0 = ntohl(ul0)+1; addr6.s6_addr32[0] = htonl(ul0); u1: addr6.s6_addr32[1] = htonl(ul1); u2: addr6.s6_addr32[2] = htonl(ul2); u3: addr6.s6_addr32[3] = htonl(ul3); if ((inet_ntop(AF_INET6, &addr6, str, INET6_ADDRSTRLEN)) != NULL) { printf("%s\n", str); } else { fprintf(stderr, "inet_ntop() error\n"); return -1; } } return 0; }