inet_pton 用来验证IP是否合法
inet_pton 用来验证IP是否合法
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#include <arpa/inet.h>#include <stdlib.h>#include <stdio.h>#include <string.h>intinvalid_ipaddr (char *str){ if (str == NULL || *str == '\0') return 1; union { struct sockaddr addr; struct sockaddr_in6 addr6; struct sockaddr_in addr4; } a; memset (&a, 0, sizeof (a)); if (1 == inet_pton (AF_INET, str, &a.addr4.sin_addr)) return 0; else if (1 == inet_pton (AF_INET6, str, &a.addr6.sin6_addr)) return 0; return 1;}int main(int argc, char *argv[]){ if(argc <2 ){ printf("Useage %s IP\n", argv[0]); exit(1); } if((invalid_ipaddr(argv[1]) == 0)){ printf("%s is ip\n", argv[1]); }else{ printf("%s is invalid_ipadd \n", argv[1]); }}?
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#./test "10.110.10.10"10.110.10.10 is ip# ./test "10.110.10.1a"10.110.10.1a is invalid_ipadd # ./test "10.110.10" 10.110.10 is invalid_ipadd?