/**************************************************************************** * libs/libc/netdb/lib_getnameinfo.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include "netdb/lib_netdb.h" #ifdef CONFIG_LIBC_NETDB /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: getnameinfo ****************************************************************************/ int getnameinfo(FAR const struct sockaddr *addr, socklen_t addrlen, FAR char *host, socklen_t hostlen, FAR char *serv, socklen_t servlen, int flags) { FAR const void *saddr; socklen_t saddr_len; int port; int ret; if (addr && addr->sa_family == AF_INET && addrlen == sizeof(struct sockaddr_in)) { FAR const struct sockaddr_in *sa_in; sa_in = (FAR const struct sockaddr_in *)addr; port = ntohs(sa_in->sin_port); saddr = &sa_in->sin_addr; saddr_len = sizeof(sa_in->sin_addr); } #ifdef CONFIG_NET_IPv6 else if (addr && addr->sa_family == AF_INET6 && addrlen == sizeof(struct sockaddr_in6)) { FAR const struct sockaddr_in6 *sa_in6; sa_in6 = (FAR const struct sockaddr_in6 *)addr; port = ntohs(sa_in6->sin6_port); saddr = &sa_in6->sin6_addr; saddr_len = sizeof(sa_in6->sin6_addr); } #endif else { return EAI_FAMILY; } if (host && !(flags & NI_NUMERICHOST)) { struct hostent hostent; FAR struct hostent *res; int error; ret = gethostbyaddr_r(saddr, saddr_len, addr->sa_family, &hostent, host, hostlen, &res, &error); if (ret == OK) { size_t sz = strlen(res->h_name) + 1; if (sz <= hostlen) { memmove(host, res->h_name, sz); } else { memmove(host, res->h_name, hostlen); host[hostlen - 1] = '\0'; } } else { switch (error) { case HOST_NOT_FOUND: { if (flags & NI_NAMEREQD) { return EAI_NONAME; } } break; case NO_RECOVERY: { if (flags & NI_NAMEREQD) { return EAI_FAIL; } } break; case NO_DATA: case TRY_AGAIN: { if (flags & NI_NAMEREQD) { return EAI_AGAIN; } } break; default: DEBUGASSERT(0); } /* Fall-back to numeric for the host name. */ flags |= NI_NUMERICHOST; } } if (host && (flags & NI_NUMERICHOST)) { if (!inet_ntop(addr->sa_family, saddr, host, hostlen)) { switch (get_errno()) { case ENOSPC: return EAI_OVERFLOW; default: DEBUGASSERT(0); } } } if (serv && !(flags & NI_NUMERICSERV)) { struct servent servent; FAR struct servent *result; ret = getservbyport_r(port, flags & NI_DGRAM ? "udp" : "tcp", &servent, serv, servlen, &result); if (ret == OK) { size_t sz = strlen(servent.s_name) + 1; if (sz <= servlen) { memmove(serv, servent.s_name, sz); } else { memmove(serv, servent.s_name, servlen); serv[servlen - 1] = '\0'; } } else { /* Fall-back to numeric for the host name. */ flags |= NI_NUMERICSERV; } } if (serv && (flags & NI_NUMERICSERV)) { snprintf(serv, servlen, "%d", port); } return OK; } #endif /* CONFIG_LIBC_NETDB */