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https://gitee.com/acl-dev/acl.git
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81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
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#include "lib_acl.h"
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int dns_lookup(const char *domain, const char *dns_ip,
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unsigned short dns_port, ACL_VSTRING *strbuf)
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{
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const char *myname = "dns_lookup";
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char buf[512];
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char rbuf[512];
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size_t sz = 512;
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unsigned short sid;
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ACL_SOCKET s;
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int rl;
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struct sockaddr_in S;
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s = socket(PF_INET, SOCK_DGRAM, 0);
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if (s < 0)
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acl_msg_fatal("socket create error");
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memset(&S, '\0', sizeof(S));
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S.sin_family = AF_INET;
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S.sin_port = htons(dns_port);
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S.sin_addr.s_addr = inet_addr(dns_ip);
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memset(buf, '\0', 512);
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sz = 512;
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sid = rfc1035BuildAQuery(domain, buf, sz, 100, NULL);
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sendto(s, buf, (int) sz, 0, (struct sockaddr *) &S, (int) sizeof(S));
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do {
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fd_set R;
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struct timeval to;
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FD_ZERO(&R);
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FD_SET(s, &R);
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to.tv_sec = 10;
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to.tv_usec = 0;
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rl = select((int) s + 1, &R, NULL, NULL, &to);
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} while (0);
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if (rl < 1) {
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acl_msg_error("TIMEOUT");
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return -1;
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}
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memset(rbuf, '\0', 512);
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rl = recv(s, rbuf, 512, 0);
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{
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unsigned short rid = 0;
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int i, n;
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rfc1035_message *answers;
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n = rfc1035MessageUnpack(rbuf, rl, &answers);
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if (n < 0) {
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acl_msg_error("ERROR %d(%s), rl=%d", rfc1035_errno, rbuf, rl);
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return (-1);
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}
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/*else if (rid != sid) {
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acl_msg_error("ERROR, ID mismatch (%#hx, %#hx)", sid, rid);
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return (-1);
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} */
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acl_msg_info("%d answers", n);
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for (i = 0; i < n; i++) {
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if (answers->answer[i].type == RFC1035_TYPE_A) {
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struct in_addr a;
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memcpy(&a, answers->answer[i].rdata, 4);
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acl_msg_info("A\t%d\t%s\n", answers->answer[i].ttl, inet_ntoa(a));
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if (strbuf)
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acl_vstring_sprintf_append(strbuf, "A\t%d\t%s\r\n",
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answers->answer[i].ttl, inet_ntoa(a));
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} else {
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acl_msg_error("can't print answer type %d", (int) answers->answer[i].type);
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}
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}
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rfc1035MessageDestroy(answers);
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}
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closesocket(s);
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return 0;
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}
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