64 lines
2.0 KiB
Plaintext
64 lines
2.0 KiB
Plaintext
#include <sys/socket.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <err.h>
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#define OUTSTR_SIZE 4096
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extern "C"
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{
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const char* copyStr( const char* str )
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{
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char* s = (char*)malloc(strlen(str) + 1);
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strcpy(s, str);
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return s;
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}
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const char* IOSGetAddressInfo(const char *host )
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{
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if( NULL == host )
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return copyStr("ERROR_HOSTNULL");
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char outstr[OUTSTR_SIZE];
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struct addrinfo hints, *res, *res0;
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memset(&hints, 0, sizeof(hints));
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//AF_INET(只返回ipv4)，AF_INET6(只返回ipv6)和AF_UNSPEC(函数返回的是适用于指定主机名和服务名且适合任何协议族的地址)
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//如果某个主机既有AAAA记录(IPV6)地址，同时又有A记录(IPV4)地址，那么AAAA记录将作为sockaddr_in6结构返回，而A记录则作为sockaddr_in结构返回
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_DEFAULT;
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printf("getaddrinfo: %s\n", host);
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//获取地址信息,这个函数支持ipv4和ipv6
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int error = getaddrinfo(host, "http", &hints, &res0);
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if (error != 0 )
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{
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printf("getaddrinfo: %s\n", gai_strerror(error));
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return copyStr("ERROR_GETADDR");
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}
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memset( outstr, 0, sizeof(char)*OUTSTR_SIZE );
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struct sockaddr_in6* addr6;
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struct sockaddr_in* addr;
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const char* solvedaddr;
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char ipbuf[32];
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for (res = res0; res; res = res->ai_next)
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{
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if (res->ai_family == AF_INET6)
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{
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addr6 =( struct sockaddr_in6*)res->ai_addr;
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//把二进制的ip转换为点数格式的ip地址 ipv6格式
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solvedaddr = inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, sizeof(ipbuf));
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strcat ( outstr, "ipv6|");
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strcat ( outstr, solvedaddr);
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}
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else
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{
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addr =( struct sockaddr_in*)res->ai_addr;
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//把二进制的ip转换为点数格式的ip地址 ipv4格式
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solvedaddr = inet_ntop(AF_INET, &addr->sin_addr, ipbuf, sizeof(ipbuf));
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strcat ( outstr, "ipv4|");
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strcat ( outstr, solvedaddr);
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}
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strcat ( outstr, "|");
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}
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return copyStr(outstr);
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}
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} |