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libs/libc/netdb: Implemented the netdb functions getnameinfo(), getse…
…rvbyport(), and getservbyport_r().
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,220 @@ | ||
| /**************************************************************************** | ||
| * libc/netdb/lib_getnameinfo.c | ||
| * | ||
| * Copyright (C) 2019 Gregory Nutt. All rights reserved. | ||
| * Author: Michael Jung <mijung@gmx.net> | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * | ||
| * 1. Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * 2. Redistributions in binary form must reproduce the above copyright | ||
| * notice, this list of conditions and the following disclaimer in | ||
| * the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * 3. Neither the name NuttX nor the names of its contributors may be | ||
| * used to endorse or promote products derived from this software | ||
| * without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | ||
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | ||
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | ||
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | ||
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | ||
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| * POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| /**************************************************************************** | ||
| * Included Files | ||
| ****************************************************************************/ | ||
|
|
||
| #include <nuttx/config.h> | ||
|
|
||
| #include <netdb.h> | ||
| #include <string.h> | ||
| #include <stdio.h> | ||
| #include <errno.h> | ||
| #include <arpa/inet.h> | ||
| #include <assert.h> | ||
|
|
||
| #include "libc.h" | ||
| #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->sa_family == AF_INET && | ||
| addrlen == sizeof(struct sockaddr_in)) | ||
| { | ||
| const struct sockaddr_in *sa_in = (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->sa_family == AF_INET6 && | ||
| addrlen == sizeof(struct sockaddr_in6)) | ||
| { | ||
| const struct sockaddr_in6 *sa_in6 = (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 (!(flags & NI_NUMERICHOST)) | ||
| { | ||
| #ifndef CONFIG_NETDB_HOSTFILE | ||
| /* Fall-back to numeric for the host name. */ | ||
|
|
||
| flags |= NI_NUMERICHOST; | ||
| (void)saddr_len; | ||
| #else | ||
| struct hostent hostent; | ||
| int h_errno; | ||
|
|
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| ret = gethostbyaddr_r(saddr, saddr_len, addr->sa_family, &hostent, host, | ||
| hostlen, &h_errno); | ||
|
|
||
| if (ret == OK) | ||
| { | ||
| size_t sz = strlen(hostent.h_name) + 1; | ||
|
|
||
| if (sz <= hostlen) | ||
| { | ||
| memmove(host, hostent.h_name, sz); | ||
| } | ||
| else | ||
| { | ||
| memmove(host, hostent.h_name, hostlen); | ||
| host[hostlen - 1] = '\0'; | ||
| } | ||
| } | ||
| else | ||
| { | ||
| switch (h_errno) | ||
| { | ||
| 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); | ||
| } | ||
|
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| /* Fall-back to numeric for the host name. */ | ||
|
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| flags |= NI_NUMERICHOST; | ||
| } | ||
| #endif /* CONFIG_NETDB_HOSTFILE */ | ||
| } | ||
|
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| if (flags & NI_NUMERICHOST) | ||
| { | ||
| if (!inet_ntop(addr->sa_family, saddr, host, hostlen)) | ||
| { | ||
| switch (errno) | ||
| { | ||
| case ENOSPC: | ||
| return EAI_OVERFLOW; | ||
|
|
||
| default: | ||
| DEBUGASSERT(0); | ||
| } | ||
| } | ||
| } | ||
|
|
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| if (!(flags & NI_NUMERICSERV)) | ||
| { | ||
| struct servent servent; | ||
| struct servent *result; | ||
|
|
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| ret = getservbyport_r(port, flags & NI_DGRAM ? "udp" : NULL, &servent, | ||
| serv, servlen, &result); | ||
|
|
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| 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. */ | ||
|
|
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| flags |= NI_NUMERICSERV; | ||
| } | ||
| } | ||
|
|
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| if (flags & NI_NUMERICSERV) | ||
| { | ||
| snprintf(serv, servlen, "%d", port); | ||
| } | ||
|
|
||
| return OK; | ||
| } | ||
|
|
||
| #endif /* CONFIG_LIBC_NETDB */ |
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