CK Sin / Mbed 2 deprecated Ethernetwebsocket

Ethernetwebsoc

Dependencies:   C12832_lcd LM75B WebSocketClient mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/api/netdb.c@0:0ed2a7c7190c, 2013-05-31 (annotated)

Committer:
GordonSin
Date:
Fri May 31 04:09:54 2013 +0000
Revision:
0:0ed2a7c7190c
31/5/2013;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
GordonSin 0:0ed2a7c7190c 1 /**
GordonSin 0:0ed2a7c7190c 2 * @file
GordonSin 0:0ed2a7c7190c 3 * API functions for name resolving
GordonSin 0:0ed2a7c7190c 4 *
GordonSin 0:0ed2a7c7190c 5 */
GordonSin 0:0ed2a7c7190c 6
GordonSin 0:0ed2a7c7190c 7 /*
GordonSin 0:0ed2a7c7190c 8 * Redistribution and use in source and binary forms, with or without modification,
GordonSin 0:0ed2a7c7190c 9 * are permitted provided that the following conditions are met:
GordonSin 0:0ed2a7c7190c 10 *
GordonSin 0:0ed2a7c7190c 11 * 1. Redistributions of source code must retain the above copyright notice,
GordonSin 0:0ed2a7c7190c 12 * this list of conditions and the following disclaimer.
GordonSin 0:0ed2a7c7190c 13 * 2. Redistributions in binary form must reproduce the above copyright notice,
GordonSin 0:0ed2a7c7190c 14 * this list of conditions and the following disclaimer in the documentation
GordonSin 0:0ed2a7c7190c 15 * and/or other materials provided with the distribution.
GordonSin 0:0ed2a7c7190c 16 * 3. The name of the author may not be used to endorse or promote products
GordonSin 0:0ed2a7c7190c 17 * derived from this software without specific prior written permission.
GordonSin 0:0ed2a7c7190c 18 *
GordonSin 0:0ed2a7c7190c 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
GordonSin 0:0ed2a7c7190c 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
GordonSin 0:0ed2a7c7190c 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
GordonSin 0:0ed2a7c7190c 22 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
GordonSin 0:0ed2a7c7190c 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
GordonSin 0:0ed2a7c7190c 24 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
GordonSin 0:0ed2a7c7190c 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
GordonSin 0:0ed2a7c7190c 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
GordonSin 0:0ed2a7c7190c 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
GordonSin 0:0ed2a7c7190c 28 * OF SUCH DAMAGE.
GordonSin 0:0ed2a7c7190c 29 *
GordonSin 0:0ed2a7c7190c 30 * This file is part of the lwIP TCP/IP stack.
GordonSin 0:0ed2a7c7190c 31 *
GordonSin 0:0ed2a7c7190c 32 * Author: Simon Goldschmidt
GordonSin 0:0ed2a7c7190c 33 *
GordonSin 0:0ed2a7c7190c 34 */
GordonSin 0:0ed2a7c7190c 35
GordonSin 0:0ed2a7c7190c 36 #include "lwip/netdb.h"
GordonSin 0:0ed2a7c7190c 37
GordonSin 0:0ed2a7c7190c 38 #if LWIP_DNS && LWIP_SOCKET
GordonSin 0:0ed2a7c7190c 39
GordonSin 0:0ed2a7c7190c 40 #include "lwip/err.h"
GordonSin 0:0ed2a7c7190c 41 #include "lwip/mem.h"
GordonSin 0:0ed2a7c7190c 42 #include "lwip/memp.h"
GordonSin 0:0ed2a7c7190c 43 #include "lwip/ip_addr.h"
GordonSin 0:0ed2a7c7190c 44 #include "lwip/api.h"
GordonSin 0:0ed2a7c7190c 45 #include "lwip/dns.h"
GordonSin 0:0ed2a7c7190c 46
GordonSin 0:0ed2a7c7190c 47 #include <string.h>
GordonSin 0:0ed2a7c7190c 48 #include <stdlib.h>
GordonSin 0:0ed2a7c7190c 49
GordonSin 0:0ed2a7c7190c 50 /** helper struct for gethostbyname_r to access the char* buffer */
GordonSin 0:0ed2a7c7190c 51 struct gethostbyname_r_helper {
GordonSin 0:0ed2a7c7190c 52 ip_addr_t *addrs;
GordonSin 0:0ed2a7c7190c 53 ip_addr_t addr;
GordonSin 0:0ed2a7c7190c 54 char *aliases;
GordonSin 0:0ed2a7c7190c 55 };
GordonSin 0:0ed2a7c7190c 56
GordonSin 0:0ed2a7c7190c 57 /** h_errno is exported in netdb.h for access by applications. */
GordonSin 0:0ed2a7c7190c 58 #if LWIP_DNS_API_DECLARE_H_ERRNO
GordonSin 0:0ed2a7c7190c 59 int h_errno;
GordonSin 0:0ed2a7c7190c 60 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
GordonSin 0:0ed2a7c7190c 61
GordonSin 0:0ed2a7c7190c 62 /** define "hostent" variables storage: 0 if we use a static (but unprotected)
GordonSin 0:0ed2a7c7190c 63 * set of variables for lwip_gethostbyname, 1 if we use a local storage */
GordonSin 0:0ed2a7c7190c 64 #ifndef LWIP_DNS_API_HOSTENT_STORAGE
GordonSin 0:0ed2a7c7190c 65 #define LWIP_DNS_API_HOSTENT_STORAGE 0
GordonSin 0:0ed2a7c7190c 66 #endif
GordonSin 0:0ed2a7c7190c 67
GordonSin 0:0ed2a7c7190c 68 /** define "hostent" variables storage */
GordonSin 0:0ed2a7c7190c 69 #if LWIP_DNS_API_HOSTENT_STORAGE
GordonSin 0:0ed2a7c7190c 70 #define HOSTENT_STORAGE
GordonSin 0:0ed2a7c7190c 71 #else
GordonSin 0:0ed2a7c7190c 72 #define HOSTENT_STORAGE static
GordonSin 0:0ed2a7c7190c 73 #endif /* LWIP_DNS_API_STATIC_HOSTENT */
GordonSin 0:0ed2a7c7190c 74
GordonSin 0:0ed2a7c7190c 75 /**
GordonSin 0:0ed2a7c7190c 76 * Returns an entry containing addresses of address family AF_INET
GordonSin 0:0ed2a7c7190c 77 * for the host with name name.
GordonSin 0:0ed2a7c7190c 78 * Due to dns_gethostbyname limitations, only one address is returned.
GordonSin 0:0ed2a7c7190c 79 *
GordonSin 0:0ed2a7c7190c 80 * @param name the hostname to resolve
GordonSin 0:0ed2a7c7190c 81 * @return an entry containing addresses of address family AF_INET
GordonSin 0:0ed2a7c7190c 82 * for the host with name name
GordonSin 0:0ed2a7c7190c 83 */
GordonSin 0:0ed2a7c7190c 84 struct hostent*
GordonSin 0:0ed2a7c7190c 85 lwip_gethostbyname(const char *name)
GordonSin 0:0ed2a7c7190c 86 {
GordonSin 0:0ed2a7c7190c 87 err_t err;
GordonSin 0:0ed2a7c7190c 88 ip_addr_t addr;
GordonSin 0:0ed2a7c7190c 89
GordonSin 0:0ed2a7c7190c 90 /* buffer variables for lwip_gethostbyname() */
GordonSin 0:0ed2a7c7190c 91 HOSTENT_STORAGE struct hostent s_hostent;
GordonSin 0:0ed2a7c7190c 92 HOSTENT_STORAGE char *s_aliases;
GordonSin 0:0ed2a7c7190c 93 HOSTENT_STORAGE ip_addr_t s_hostent_addr;
GordonSin 0:0ed2a7c7190c 94 HOSTENT_STORAGE ip_addr_t *s_phostent_addr[2];
GordonSin 0:0ed2a7c7190c 95
GordonSin 0:0ed2a7c7190c 96 /* query host IP address */
GordonSin 0:0ed2a7c7190c 97 err = netconn_gethostbyname(name, &addr);
GordonSin 0:0ed2a7c7190c 98 if (err != ERR_OK) {
GordonSin 0:0ed2a7c7190c 99 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
GordonSin 0:0ed2a7c7190c 100 h_errno = HOST_NOT_FOUND;
GordonSin 0:0ed2a7c7190c 101 return NULL;
GordonSin 0:0ed2a7c7190c 102 }
GordonSin 0:0ed2a7c7190c 103
GordonSin 0:0ed2a7c7190c 104 /* fill hostent */
GordonSin 0:0ed2a7c7190c 105 s_hostent_addr = addr;
GordonSin 0:0ed2a7c7190c 106 s_phostent_addr[0] = &s_hostent_addr;
GordonSin 0:0ed2a7c7190c 107 s_phostent_addr[1] = NULL;
GordonSin 0:0ed2a7c7190c 108 s_hostent.h_name = (char*)name;
GordonSin 0:0ed2a7c7190c 109 s_hostent.h_aliases = &s_aliases;
GordonSin 0:0ed2a7c7190c 110 s_hostent.h_addrtype = AF_INET;
GordonSin 0:0ed2a7c7190c 111 s_hostent.h_length = sizeof(ip_addr_t);
GordonSin 0:0ed2a7c7190c 112 s_hostent.h_addr_list = (char**)&s_phostent_addr;
GordonSin 0:0ed2a7c7190c 113
GordonSin 0:0ed2a7c7190c 114 #if DNS_DEBUG
GordonSin 0:0ed2a7c7190c 115 /* dump hostent */
GordonSin 0:0ed2a7c7190c 116 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
GordonSin 0:0ed2a7c7190c 117 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
GordonSin 0:0ed2a7c7190c 118 if (s_hostent.h_aliases != NULL) {
GordonSin 0:0ed2a7c7190c 119 u8_t idx;
GordonSin 0:0ed2a7c7190c 120 for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
GordonSin 0:0ed2a7c7190c 121 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
GordonSin 0:0ed2a7c7190c 122 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
GordonSin 0:0ed2a7c7190c 123 }
GordonSin 0:0ed2a7c7190c 124 }
GordonSin 0:0ed2a7c7190c 125 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
GordonSin 0:0ed2a7c7190c 126 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
GordonSin 0:0ed2a7c7190c 127 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
GordonSin 0:0ed2a7c7190c 128 if (s_hostent.h_addr_list != NULL) {
GordonSin 0:0ed2a7c7190c 129 u8_t idx;
GordonSin 0:0ed2a7c7190c 130 for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
GordonSin 0:0ed2a7c7190c 131 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
GordonSin 0:0ed2a7c7190c 132 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i]-> == %s\n", idx, ip_ntoa((ip_addr_t*)s_hostent.h_addr_list[idx])));
GordonSin 0:0ed2a7c7190c 133 }
GordonSin 0:0ed2a7c7190c 134 }
GordonSin 0:0ed2a7c7190c 135 #endif /* DNS_DEBUG */
GordonSin 0:0ed2a7c7190c 136
GordonSin 0:0ed2a7c7190c 137 #if LWIP_DNS_API_HOSTENT_STORAGE
GordonSin 0:0ed2a7c7190c 138 /* this function should return the "per-thread" hostent after copy from s_hostent */
GordonSin 0:0ed2a7c7190c 139 return sys_thread_hostent(&s_hostent);
GordonSin 0:0ed2a7c7190c 140 #else
GordonSin 0:0ed2a7c7190c 141 return &s_hostent;
GordonSin 0:0ed2a7c7190c 142 #endif /* LWIP_DNS_API_HOSTENT_STORAGE */
GordonSin 0:0ed2a7c7190c 143 }
GordonSin 0:0ed2a7c7190c 144
GordonSin 0:0ed2a7c7190c 145 /**
GordonSin 0:0ed2a7c7190c 146 * Thread-safe variant of lwip_gethostbyname: instead of using a static
GordonSin 0:0ed2a7c7190c 147 * buffer, this function takes buffer and errno pointers as arguments
GordonSin 0:0ed2a7c7190c 148 * and uses these for the result.
GordonSin 0:0ed2a7c7190c 149 *
GordonSin 0:0ed2a7c7190c 150 * @param name the hostname to resolve
GordonSin 0:0ed2a7c7190c 151 * @param ret pre-allocated struct where to store the result
GordonSin 0:0ed2a7c7190c 152 * @param buf pre-allocated buffer where to store additional data
GordonSin 0:0ed2a7c7190c 153 * @param buflen the size of buf
GordonSin 0:0ed2a7c7190c 154 * @param result pointer to a hostent pointer that is set to ret on success
GordonSin 0:0ed2a7c7190c 155 * and set to zero on error
GordonSin 0:0ed2a7c7190c 156 * @param h_errnop pointer to an int where to store errors (instead of modifying
GordonSin 0:0ed2a7c7190c 157 * the global h_errno)
GordonSin 0:0ed2a7c7190c 158 * @return 0 on success, non-zero on error, additional error information
GordonSin 0:0ed2a7c7190c 159 * is stored in *h_errnop instead of h_errno to be thread-safe
GordonSin 0:0ed2a7c7190c 160 */
GordonSin 0:0ed2a7c7190c 161 int
GordonSin 0:0ed2a7c7190c 162 lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
GordonSin 0:0ed2a7c7190c 163 size_t buflen, struct hostent **result, int *h_errnop)
GordonSin 0:0ed2a7c7190c 164 {
GordonSin 0:0ed2a7c7190c 165 err_t err;
GordonSin 0:0ed2a7c7190c 166 struct gethostbyname_r_helper *h;
GordonSin 0:0ed2a7c7190c 167 char *hostname;
GordonSin 0:0ed2a7c7190c 168 size_t namelen;
GordonSin 0:0ed2a7c7190c 169 int lh_errno;
GordonSin 0:0ed2a7c7190c 170
GordonSin 0:0ed2a7c7190c 171 if (h_errnop == NULL) {
GordonSin 0:0ed2a7c7190c 172 /* ensure h_errnop is never NULL */
GordonSin 0:0ed2a7c7190c 173 h_errnop = &lh_errno;
GordonSin 0:0ed2a7c7190c 174 }
GordonSin 0:0ed2a7c7190c 175
GordonSin 0:0ed2a7c7190c 176 if (result == NULL) {
GordonSin 0:0ed2a7c7190c 177 /* not all arguments given */
GordonSin 0:0ed2a7c7190c 178 *h_errnop = EINVAL;
GordonSin 0:0ed2a7c7190c 179 return -1;
GordonSin 0:0ed2a7c7190c 180 }
GordonSin 0:0ed2a7c7190c 181 /* first thing to do: set *result to nothing */
GordonSin 0:0ed2a7c7190c 182 *result = NULL;
GordonSin 0:0ed2a7c7190c 183 if ((name == NULL) || (ret == NULL) || (buf == 0)) {
GordonSin 0:0ed2a7c7190c 184 /* not all arguments given */
GordonSin 0:0ed2a7c7190c 185 *h_errnop = EINVAL;
GordonSin 0:0ed2a7c7190c 186 return -1;
GordonSin 0:0ed2a7c7190c 187 }
GordonSin 0:0ed2a7c7190c 188
GordonSin 0:0ed2a7c7190c 189 namelen = strlen(name);
GordonSin 0:0ed2a7c7190c 190 if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
GordonSin 0:0ed2a7c7190c 191 /* buf can't hold the data needed + a copy of name */
GordonSin 0:0ed2a7c7190c 192 *h_errnop = ERANGE;
GordonSin 0:0ed2a7c7190c 193 return -1;
GordonSin 0:0ed2a7c7190c 194 }
GordonSin 0:0ed2a7c7190c 195
GordonSin 0:0ed2a7c7190c 196 h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
GordonSin 0:0ed2a7c7190c 197 hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
GordonSin 0:0ed2a7c7190c 198
GordonSin 0:0ed2a7c7190c 199 /* query host IP address */
GordonSin 0:0ed2a7c7190c 200 err = netconn_gethostbyname(name, &(h->addr));
GordonSin 0:0ed2a7c7190c 201 if (err != ERR_OK) {
GordonSin 0:0ed2a7c7190c 202 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
GordonSin 0:0ed2a7c7190c 203 *h_errnop = ENSRNOTFOUND;
GordonSin 0:0ed2a7c7190c 204 return -1;
GordonSin 0:0ed2a7c7190c 205 }
GordonSin 0:0ed2a7c7190c 206
GordonSin 0:0ed2a7c7190c 207 /* copy the hostname into buf */
GordonSin 0:0ed2a7c7190c 208 MEMCPY(hostname, name, namelen);
GordonSin 0:0ed2a7c7190c 209 hostname[namelen] = 0;
GordonSin 0:0ed2a7c7190c 210
GordonSin 0:0ed2a7c7190c 211 /* fill hostent */
GordonSin 0:0ed2a7c7190c 212 h->addrs = &(h->addr);
GordonSin 0:0ed2a7c7190c 213 h->aliases = NULL;
GordonSin 0:0ed2a7c7190c 214 ret->h_name = (char*)hostname;
GordonSin 0:0ed2a7c7190c 215 ret->h_aliases = &(h->aliases);
GordonSin 0:0ed2a7c7190c 216 ret->h_addrtype = AF_INET;
GordonSin 0:0ed2a7c7190c 217 ret->h_length = sizeof(ip_addr_t);
GordonSin 0:0ed2a7c7190c 218 ret->h_addr_list = (char**)&(h->addrs);
GordonSin 0:0ed2a7c7190c 219
GordonSin 0:0ed2a7c7190c 220 /* set result != NULL */
GordonSin 0:0ed2a7c7190c 221 *result = ret;
GordonSin 0:0ed2a7c7190c 222
GordonSin 0:0ed2a7c7190c 223 /* return success */
GordonSin 0:0ed2a7c7190c 224 return 0;
GordonSin 0:0ed2a7c7190c 225 }
GordonSin 0:0ed2a7c7190c 226
GordonSin 0:0ed2a7c7190c 227 /**
GordonSin 0:0ed2a7c7190c 228 * Frees one or more addrinfo structures returned by getaddrinfo(), along with
GordonSin 0:0ed2a7c7190c 229 * any additional storage associated with those structures. If the ai_next field
GordonSin 0:0ed2a7c7190c 230 * of the structure is not null, the entire list of structures is freed.
GordonSin 0:0ed2a7c7190c 231 *
GordonSin 0:0ed2a7c7190c 232 * @param ai struct addrinfo to free
GordonSin 0:0ed2a7c7190c 233 */
GordonSin 0:0ed2a7c7190c 234 void
GordonSin 0:0ed2a7c7190c 235 lwip_freeaddrinfo(struct addrinfo *ai)
GordonSin 0:0ed2a7c7190c 236 {
GordonSin 0:0ed2a7c7190c 237 struct addrinfo *next;
GordonSin 0:0ed2a7c7190c 238
GordonSin 0:0ed2a7c7190c 239 while (ai != NULL) {
GordonSin 0:0ed2a7c7190c 240 next = ai->ai_next;
GordonSin 0:0ed2a7c7190c 241 memp_free(MEMP_NETDB, ai);
GordonSin 0:0ed2a7c7190c 242 ai = next;
GordonSin 0:0ed2a7c7190c 243 }
GordonSin 0:0ed2a7c7190c 244 }
GordonSin 0:0ed2a7c7190c 245
GordonSin 0:0ed2a7c7190c 246 /**
GordonSin 0:0ed2a7c7190c 247 * Translates the name of a service location (for example, a host name) and/or
GordonSin 0:0ed2a7c7190c 248 * a service name and returns a set of socket addresses and associated
GordonSin 0:0ed2a7c7190c 249 * information to be used in creating a socket with which to address the
GordonSin 0:0ed2a7c7190c 250 * specified service.
GordonSin 0:0ed2a7c7190c 251 * Memory for the result is allocated internally and must be freed by calling
GordonSin 0:0ed2a7c7190c 252 * lwip_freeaddrinfo()!
GordonSin 0:0ed2a7c7190c 253 *
GordonSin 0:0ed2a7c7190c 254 * Due to a limitation in dns_gethostbyname, only the first address of a
GordonSin 0:0ed2a7c7190c 255 * host is returned.
GordonSin 0:0ed2a7c7190c 256 * Also, service names are not supported (only port numbers)!
GordonSin 0:0ed2a7c7190c 257 *
GordonSin 0:0ed2a7c7190c 258 * @param nodename descriptive name or address string of the host
GordonSin 0:0ed2a7c7190c 259 * (may be NULL -> local address)
GordonSin 0:0ed2a7c7190c 260 * @param servname port number as string of NULL
GordonSin 0:0ed2a7c7190c 261 * @param hints structure containing input values that set socktype and protocol
GordonSin 0:0ed2a7c7190c 262 * @param res pointer to a pointer where to store the result (set to NULL on failure)
GordonSin 0:0ed2a7c7190c 263 * @return 0 on success, non-zero on failure
GordonSin 0:0ed2a7c7190c 264 */
GordonSin 0:0ed2a7c7190c 265 int
GordonSin 0:0ed2a7c7190c 266 lwip_getaddrinfo(const char *nodename, const char *servname,
GordonSin 0:0ed2a7c7190c 267 const struct addrinfo *hints, struct addrinfo **res)
GordonSin 0:0ed2a7c7190c 268 {
GordonSin 0:0ed2a7c7190c 269 err_t err;
GordonSin 0:0ed2a7c7190c 270 ip_addr_t addr;
GordonSin 0:0ed2a7c7190c 271 struct addrinfo *ai;
GordonSin 0:0ed2a7c7190c 272 struct sockaddr_in *sa = NULL;
GordonSin 0:0ed2a7c7190c 273 int port_nr = 0;
GordonSin 0:0ed2a7c7190c 274 size_t total_size;
GordonSin 0:0ed2a7c7190c 275 size_t namelen = 0;
GordonSin 0:0ed2a7c7190c 276
GordonSin 0:0ed2a7c7190c 277 if (res == NULL) {
GordonSin 0:0ed2a7c7190c 278 return EAI_FAIL;
GordonSin 0:0ed2a7c7190c 279 }
GordonSin 0:0ed2a7c7190c 280 *res = NULL;
GordonSin 0:0ed2a7c7190c 281 if ((nodename == NULL) && (servname == NULL)) {
GordonSin 0:0ed2a7c7190c 282 return EAI_NONAME;
GordonSin 0:0ed2a7c7190c 283 }
GordonSin 0:0ed2a7c7190c 284
GordonSin 0:0ed2a7c7190c 285 if (servname != NULL) {
GordonSin 0:0ed2a7c7190c 286 /* service name specified: convert to port number
GordonSin 0:0ed2a7c7190c 287 * @todo?: currently, only ASCII integers (port numbers) are supported! */
GordonSin 0:0ed2a7c7190c 288 port_nr = atoi(servname);
GordonSin 0:0ed2a7c7190c 289 if ((port_nr <= 0) || (port_nr > 0xffff)) {
GordonSin 0:0ed2a7c7190c 290 return EAI_SERVICE;
GordonSin 0:0ed2a7c7190c 291 }
GordonSin 0:0ed2a7c7190c 292 }
GordonSin 0:0ed2a7c7190c 293
GordonSin 0:0ed2a7c7190c 294 if (nodename != NULL) {
GordonSin 0:0ed2a7c7190c 295 /* service location specified, try to resolve */
GordonSin 0:0ed2a7c7190c 296 err = netconn_gethostbyname(nodename, &addr);
GordonSin 0:0ed2a7c7190c 297 if (err != ERR_OK) {
GordonSin 0:0ed2a7c7190c 298 return EAI_FAIL;
GordonSin 0:0ed2a7c7190c 299 }
GordonSin 0:0ed2a7c7190c 300 } else {
GordonSin 0:0ed2a7c7190c 301 /* service location specified, use loopback address */
GordonSin 0:0ed2a7c7190c 302 ip_addr_set_loopback(&addr);
GordonSin 0:0ed2a7c7190c 303 }
GordonSin 0:0ed2a7c7190c 304
GordonSin 0:0ed2a7c7190c 305 total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
GordonSin 0:0ed2a7c7190c 306 if (nodename != NULL) {
GordonSin 0:0ed2a7c7190c 307 namelen = strlen(nodename);
GordonSin 0:0ed2a7c7190c 308 LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
GordonSin 0:0ed2a7c7190c 309 total_size += namelen + 1;
GordonSin 0:0ed2a7c7190c 310 }
GordonSin 0:0ed2a7c7190c 311 /* If this fails, please report to lwip-devel! :-) */
GordonSin 0:0ed2a7c7190c 312 LWIP_ASSERT("total_size <= NETDB_ELEM_SIZE: please report this!",
GordonSin 0:0ed2a7c7190c 313 total_size <= NETDB_ELEM_SIZE);
GordonSin 0:0ed2a7c7190c 314 ai = (struct addrinfo *)memp_malloc(MEMP_NETDB);
GordonSin 0:0ed2a7c7190c 315 if (ai == NULL) {
GordonSin 0:0ed2a7c7190c 316 goto memerr;
GordonSin 0:0ed2a7c7190c 317 }
GordonSin 0:0ed2a7c7190c 318 memset(ai, 0, total_size);
GordonSin 0:0ed2a7c7190c 319 sa = (struct sockaddr_in*)((u8_t*)ai + sizeof(struct addrinfo));
GordonSin 0:0ed2a7c7190c 320 /* set up sockaddr */
GordonSin 0:0ed2a7c7190c 321 inet_addr_from_ipaddr(&sa->sin_addr, &addr);
GordonSin 0:0ed2a7c7190c 322 sa->sin_family = AF_INET;
GordonSin 0:0ed2a7c7190c 323 sa->sin_len = sizeof(struct sockaddr_in);
GordonSin 0:0ed2a7c7190c 324 sa->sin_port = htons((u16_t)port_nr);
GordonSin 0:0ed2a7c7190c 325
GordonSin 0:0ed2a7c7190c 326 /* set up addrinfo */
GordonSin 0:0ed2a7c7190c 327 ai->ai_family = AF_INET;
GordonSin 0:0ed2a7c7190c 328 if (hints != NULL) {
GordonSin 0:0ed2a7c7190c 329 /* copy socktype & protocol from hints if specified */
GordonSin 0:0ed2a7c7190c 330 ai->ai_socktype = hints->ai_socktype;
GordonSin 0:0ed2a7c7190c 331 ai->ai_protocol = hints->ai_protocol;
GordonSin 0:0ed2a7c7190c 332 }
GordonSin 0:0ed2a7c7190c 333 if (nodename != NULL) {
GordonSin 0:0ed2a7c7190c 334 /* copy nodename to canonname if specified */
GordonSin 0:0ed2a7c7190c 335 ai->ai_canonname = ((char*)ai + sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
GordonSin 0:0ed2a7c7190c 336 MEMCPY(ai->ai_canonname, nodename, namelen);
GordonSin 0:0ed2a7c7190c 337 ai->ai_canonname[namelen] = 0;
GordonSin 0:0ed2a7c7190c 338 }
GordonSin 0:0ed2a7c7190c 339 ai->ai_addrlen = sizeof(struct sockaddr_in);
GordonSin 0:0ed2a7c7190c 340 ai->ai_addr = (struct sockaddr*)sa;
GordonSin 0:0ed2a7c7190c 341
GordonSin 0:0ed2a7c7190c 342 *res = ai;
GordonSin 0:0ed2a7c7190c 343
GordonSin 0:0ed2a7c7190c 344 return 0;
GordonSin 0:0ed2a7c7190c 345 memerr:
GordonSin 0:0ed2a7c7190c 346 if (ai != NULL) {
GordonSin 0:0ed2a7c7190c 347 memp_free(MEMP_NETDB, ai);
GordonSin 0:0ed2a7c7190c 348 }
GordonSin 0:0ed2a7c7190c 349 return EAI_MEMORY;
GordonSin 0:0ed2a7c7190c 350 }
GordonSin 0:0ed2a7c7190c 351
GordonSin 0:0ed2a7c7190c 352 #endif /* LWIP_DNS && LWIP_SOCKET */