+void ff_freeaddrinfo(struct addrinfo *res)
+{
+#if HAVE_WINSOCK2_H
+ void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
+ HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
+ win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
+ GetProcAddress(ws2mod, "freeaddrinfo");
+ if (win_freeaddrinfo) {
+ win_freeaddrinfo(res);
+ return;
+ }
+#endif
+
+ av_free(res->ai_canonname);
+ av_free(res->ai_addr);
+ av_free(res);
+}
+
+int ff_getnameinfo(const struct sockaddr *sa, int salen,
+ char *host, int hostlen,
+ char *serv, int servlen, int flags)
+{
+ const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
+
+#if HAVE_WINSOCK2_H
+ int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
+ char *host, DWORD hostlen,
+ char *serv, DWORD servlen, int flags);
+ HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
+ win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
+ if (win_getnameinfo)
+ return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
+#endif
+
+ if (sa->sa_family != AF_INET)
+ return EAI_FAMILY;
+ if (!host && !serv)
+ return EAI_NONAME;
+
+ if (host && hostlen > 0) {
+ struct hostent *ent = NULL;
+ uint32_t a;
+ if (!(flags & NI_NUMERICHOST))
+ ent = gethostbyaddr((const char *)&sin->sin_addr,
+ sizeof(sin->sin_addr), AF_INET);
+
+ if (ent) {
+ snprintf(host, hostlen, "%s", ent->h_name);
+ } else if (flags & NI_NAMERQD) {
+ return EAI_NONAME;
+ } else {
+ a = ntohl(sin->sin_addr.s_addr);
+ snprintf(host, hostlen, "%d.%d.%d.%d",
+ ((a >> 24) & 0xff), ((a >> 16) & 0xff),
+ ((a >> 8) & 0xff), (a & 0xff));
+ }
+ }
+
+ if (serv && servlen > 0) {
+ struct servent *ent = NULL;
+ if (!(flags & NI_NUMERICSERV))
+ ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
+
+ if (ent)
+ snprintf(serv, servlen, "%s", ent->s_name);
+ else
+ snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
+ }
+
+ return 0;
+}
+#endif /* !HAVE_GETADDRINFO */
+
+#if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H
+const char *ff_gai_strerror(int ecode)
+{
+ switch (ecode) {
+ case EAI_AGAIN:
+ return "Temporary failure in name resolution";
+ case EAI_BADFLAGS:
+ return "Invalid flags for ai_flags";
+ case EAI_FAIL:
+ return "A non-recoverable error occurred";
+ case EAI_FAMILY:
+ return "The address family was not recognized or the address "
+ "length was invalid for the specified family";
+ case EAI_MEMORY:
+ return "Memory allocation failure";
+#if EAI_NODATA != EAI_NONAME
+ case EAI_NODATA:
+ return "No address associated with hostname";
+#endif
+ case EAI_NONAME:
+ return "The name does not resolve for the supplied parameters";
+ case EAI_SERVICE:
+ return "servname not supported for ai_socktype";
+ case EAI_SOCKTYPE:
+ return "ai_socktype not supported";
+ }
+
+ return "Unknown error";
+}
+#endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */
+