Donatien Garnier / LwIPNetworking

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Dependencies:   DebugLib Socket lwip lwip-sys

Dependents:   EthernetInterface

Fork of NetworkingCoreLib by Donatien Garnier

main/lwip/src/api/netdb.c@0:013f5d54248c, 2012-05-24 (annotated)

Committer:
donatien
Date:
Thu May 24 14:49:40 2012 +0000
Revision:
0:013f5d54248c
Initial Commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
donatien 0:013f5d54248c 1 /**
donatien 0:013f5d54248c 2 * @file
donatien 0:013f5d54248c 3 * API functions for name resolving
donatien 0:013f5d54248c 4 *
donatien 0:013f5d54248c 5 */
donatien 0:013f5d54248c 6
donatien 0:013f5d54248c 7 /*
donatien 0:013f5d54248c 8 * Redistribution and use in source and binary forms, with or without modification,
donatien 0:013f5d54248c 9 * are permitted provided that the following conditions are met:
donatien 0:013f5d54248c 10 *
donatien 0:013f5d54248c 11 * 1. Redistributions of source code must retain the above copyright notice,
donatien 0:013f5d54248c 12 * this list of conditions and the following disclaimer.
donatien 0:013f5d54248c 13 * 2. Redistributions in binary form must reproduce the above copyright notice,
donatien 0:013f5d54248c 14 * this list of conditions and the following disclaimer in the documentation
donatien 0:013f5d54248c 15 * and/or other materials provided with the distribution.
donatien 0:013f5d54248c 16 * 3. The name of the author may not be used to endorse or promote products
donatien 0:013f5d54248c 17 * derived from this software without specific prior written permission.
donatien 0:013f5d54248c 18 *
donatien 0:013f5d54248c 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien 0:013f5d54248c 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien 0:013f5d54248c 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien 0:013f5d54248c 22 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien 0:013f5d54248c 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien 0:013f5d54248c 24 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien 0:013f5d54248c 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien 0:013f5d54248c 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien 0:013f5d54248c 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien 0:013f5d54248c 28 * OF SUCH DAMAGE.
donatien 0:013f5d54248c 29 *
donatien 0:013f5d54248c 30 * This file is part of the lwIP TCP/IP stack.
donatien 0:013f5d54248c 31 *
donatien 0:013f5d54248c 32 * Author: Simon Goldschmidt
donatien 0:013f5d54248c 33 *
donatien 0:013f5d54248c 34 */
donatien 0:013f5d54248c 35
donatien 0:013f5d54248c 36 #include "lwip/netdb.h"
donatien 0:013f5d54248c 37
donatien 0:013f5d54248c 38 #if LWIP_DNS && LWIP_SOCKET
donatien 0:013f5d54248c 39
donatien 0:013f5d54248c 40 #include "lwip/err.h"
donatien 0:013f5d54248c 41 #include "lwip/mem.h"
donatien 0:013f5d54248c 42 #include "lwip/memp.h"
donatien 0:013f5d54248c 43 #include "lwip/ip_addr.h"
donatien 0:013f5d54248c 44 #include "lwip/api.h"
donatien 0:013f5d54248c 45 #include "lwip/dns.h"
donatien 0:013f5d54248c 46
donatien 0:013f5d54248c 47 #include <string.h>
donatien 0:013f5d54248c 48 #include <stdlib.h>
donatien 0:013f5d54248c 49
donatien 0:013f5d54248c 50 /** helper struct for gethostbyname_r to access the char* buffer */
donatien 0:013f5d54248c 51 struct gethostbyname_r_helper {
donatien 0:013f5d54248c 52 ip_addr_t *addrs;
donatien 0:013f5d54248c 53 ip_addr_t addr;
donatien 0:013f5d54248c 54 char *aliases;
donatien 0:013f5d54248c 55 };
donatien 0:013f5d54248c 56
donatien 0:013f5d54248c 57 /** h_errno is exported in netdb.h for access by applications. */
donatien 0:013f5d54248c 58 #if LWIP_DNS_API_DECLARE_H_ERRNO
donatien 0:013f5d54248c 59 int h_errno;
donatien 0:013f5d54248c 60 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
donatien 0:013f5d54248c 61
donatien 0:013f5d54248c 62 /** define "hostent" variables storage: 0 if we use a static (but unprotected)
donatien 0:013f5d54248c 63 * set of variables for lwip_gethostbyname, 1 if we use a local storage */
donatien 0:013f5d54248c 64 #ifndef LWIP_DNS_API_HOSTENT_STORAGE
donatien 0:013f5d54248c 65 #define LWIP_DNS_API_HOSTENT_STORAGE 0
donatien 0:013f5d54248c 66 #endif
donatien 0:013f5d54248c 67
donatien 0:013f5d54248c 68 /** define "hostent" variables storage */
donatien 0:013f5d54248c 69 #if LWIP_DNS_API_HOSTENT_STORAGE
donatien 0:013f5d54248c 70 #define HOSTENT_STORAGE
donatien 0:013f5d54248c 71 #else
donatien 0:013f5d54248c 72 #define HOSTENT_STORAGE static
donatien 0:013f5d54248c 73 #endif /* LWIP_DNS_API_STATIC_HOSTENT */
donatien 0:013f5d54248c 74
donatien 0:013f5d54248c 75 /**
donatien 0:013f5d54248c 76 * Returns an entry containing addresses of address family AF_INET
donatien 0:013f5d54248c 77 * for the host with name name.
donatien 0:013f5d54248c 78 * Due to dns_gethostbyname limitations, only one address is returned.
donatien 0:013f5d54248c 79 *
donatien 0:013f5d54248c 80 * @param name the hostname to resolve
donatien 0:013f5d54248c 81 * @return an entry containing addresses of address family AF_INET
donatien 0:013f5d54248c 82 * for the host with name name
donatien 0:013f5d54248c 83 */
donatien 0:013f5d54248c 84 struct hostent*
donatien 0:013f5d54248c 85 lwip_gethostbyname(const char *name)
donatien 0:013f5d54248c 86 {
donatien 0:013f5d54248c 87 err_t err;
donatien 0:013f5d54248c 88 ip_addr_t addr;
donatien 0:013f5d54248c 89
donatien 0:013f5d54248c 90 /* buffer variables for lwip_gethostbyname() */
donatien 0:013f5d54248c 91 HOSTENT_STORAGE struct hostent s_hostent;
donatien 0:013f5d54248c 92 HOSTENT_STORAGE char *s_aliases;
donatien 0:013f5d54248c 93 HOSTENT_STORAGE ip_addr_t s_hostent_addr;
donatien 0:013f5d54248c 94 HOSTENT_STORAGE ip_addr_t *s_phostent_addr[2];
donatien 0:013f5d54248c 95
donatien 0:013f5d54248c 96 /* query host IP address */
donatien 0:013f5d54248c 97 err = netconn_gethostbyname(name, &addr);
donatien 0:013f5d54248c 98 if (err != ERR_OK) {
donatien 0:013f5d54248c 99 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
donatien 0:013f5d54248c 100 h_errno = HOST_NOT_FOUND;
donatien 0:013f5d54248c 101 return NULL;
donatien 0:013f5d54248c 102 }
donatien 0:013f5d54248c 103
donatien 0:013f5d54248c 104 /* fill hostent */
donatien 0:013f5d54248c 105 s_hostent_addr = addr;
donatien 0:013f5d54248c 106 s_phostent_addr[0] = &s_hostent_addr;
donatien 0:013f5d54248c 107 s_phostent_addr[1] = NULL;
donatien 0:013f5d54248c 108 s_hostent.h_name = (char*)name;
donatien 0:013f5d54248c 109 s_hostent.h_aliases = &s_aliases;
donatien 0:013f5d54248c 110 s_hostent.h_addrtype = AF_INET;
donatien 0:013f5d54248c 111 s_hostent.h_length = sizeof(ip_addr_t);
donatien 0:013f5d54248c 112 s_hostent.h_addr_list = (char**)&s_phostent_addr;
donatien 0:013f5d54248c 113
donatien 0:013f5d54248c 114 #if DNS_DEBUG
donatien 0:013f5d54248c 115 /* dump hostent */
donatien 0:013f5d54248c 116 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
donatien 0:013f5d54248c 117 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
donatien 0:013f5d54248c 118 if (s_hostent.h_aliases != NULL) {
donatien 0:013f5d54248c 119 u8_t idx;
donatien 0:013f5d54248c 120 for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
donatien 0:013f5d54248c 121 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
donatien 0:013f5d54248c 122 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
donatien 0:013f5d54248c 123 }
donatien 0:013f5d54248c 124 }
donatien 0:013f5d54248c 125 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
donatien 0:013f5d54248c 126 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
donatien 0:013f5d54248c 127 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
donatien 0:013f5d54248c 128 if (s_hostent.h_addr_list != NULL) {
donatien 0:013f5d54248c 129 u8_t idx;
donatien 0:013f5d54248c 130 for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
donatien 0:013f5d54248c 131 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
donatien 0:013f5d54248c 132 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i]-> == %s\n", idx, ip_ntoa((ip_addr_t*)s_hostent.h_addr_list[idx])));
donatien 0:013f5d54248c 133 }
donatien 0:013f5d54248c 134 }
donatien 0:013f5d54248c 135 #endif /* DNS_DEBUG */
donatien 0:013f5d54248c 136
donatien 0:013f5d54248c 137 #if LWIP_DNS_API_HOSTENT_STORAGE
donatien 0:013f5d54248c 138 /* this function should return the "per-thread" hostent after copy from s_hostent */
donatien 0:013f5d54248c 139 return sys_thread_hostent(&s_hostent);
donatien 0:013f5d54248c 140 #else
donatien 0:013f5d54248c 141 return &s_hostent;
donatien 0:013f5d54248c 142 #endif /* LWIP_DNS_API_HOSTENT_STORAGE */
donatien 0:013f5d54248c 143 }
donatien 0:013f5d54248c 144
donatien 0:013f5d54248c 145 /**
donatien 0:013f5d54248c 146 * Thread-safe variant of lwip_gethostbyname: instead of using a static
donatien 0:013f5d54248c 147 * buffer, this function takes buffer and errno pointers as arguments
donatien 0:013f5d54248c 148 * and uses these for the result.
donatien 0:013f5d54248c 149 *
donatien 0:013f5d54248c 150 * @param name the hostname to resolve
donatien 0:013f5d54248c 151 * @param ret pre-allocated struct where to store the result
donatien 0:013f5d54248c 152 * @param buf pre-allocated buffer where to store additional data
donatien 0:013f5d54248c 153 * @param buflen the size of buf
donatien 0:013f5d54248c 154 * @param result pointer to a hostent pointer that is set to ret on success
donatien 0:013f5d54248c 155 * and set to zero on error
donatien 0:013f5d54248c 156 * @param h_errnop pointer to an int where to store errors (instead of modifying
donatien 0:013f5d54248c 157 * the global h_errno)
donatien 0:013f5d54248c 158 * @return 0 on success, non-zero on error, additional error information
donatien 0:013f5d54248c 159 * is stored in *h_errnop instead of h_errno to be thread-safe
donatien 0:013f5d54248c 160 */
donatien 0:013f5d54248c 161 int
donatien 0:013f5d54248c 162 lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
donatien 0:013f5d54248c 163 size_t buflen, struct hostent **result, int *h_errnop)
donatien 0:013f5d54248c 164 {
donatien 0:013f5d54248c 165 err_t err;
donatien 0:013f5d54248c 166 struct gethostbyname_r_helper *h;
donatien 0:013f5d54248c 167 char *hostname;
donatien 0:013f5d54248c 168 size_t namelen;
donatien 0:013f5d54248c 169 int lh_errno;
donatien 0:013f5d54248c 170
donatien 0:013f5d54248c 171 if (h_errnop == NULL) {
donatien 0:013f5d54248c 172 /* ensure h_errnop is never NULL */
donatien 0:013f5d54248c 173 h_errnop = &lh_errno;
donatien 0:013f5d54248c 174 }
donatien 0:013f5d54248c 175
donatien 0:013f5d54248c 176 if (result == NULL) {
donatien 0:013f5d54248c 177 /* not all arguments given */
donatien 0:013f5d54248c 178 *h_errnop = EINVAL;
donatien 0:013f5d54248c 179 return -1;
donatien 0:013f5d54248c 180 }
donatien 0:013f5d54248c 181 /* first thing to do: set *result to nothing */
donatien 0:013f5d54248c 182 *result = NULL;
donatien 0:013f5d54248c 183 if ((name == NULL) || (ret == NULL) || (buf == 0)) {
donatien 0:013f5d54248c 184 /* not all arguments given */
donatien 0:013f5d54248c 185 *h_errnop = EINVAL;
donatien 0:013f5d54248c 186 return -1;
donatien 0:013f5d54248c 187 }
donatien 0:013f5d54248c 188
donatien 0:013f5d54248c 189 namelen = strlen(name);
donatien 0:013f5d54248c 190 if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
donatien 0:013f5d54248c 191 /* buf can't hold the data needed + a copy of name */
donatien 0:013f5d54248c 192 *h_errnop = ERANGE;
donatien 0:013f5d54248c 193 return -1;
donatien 0:013f5d54248c 194 }
donatien 0:013f5d54248c 195
donatien 0:013f5d54248c 196 h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
donatien 0:013f5d54248c 197 hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
donatien 0:013f5d54248c 198
donatien 0:013f5d54248c 199 /* query host IP address */
donatien 0:013f5d54248c 200 err = netconn_gethostbyname(name, &(h->addr));
donatien 0:013f5d54248c 201 if (err != ERR_OK) {
donatien 0:013f5d54248c 202 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
donatien 0:013f5d54248c 203 *h_errnop = ENSRNOTFOUND;
donatien 0:013f5d54248c 204 return -1;
donatien 0:013f5d54248c 205 }
donatien 0:013f5d54248c 206
donatien 0:013f5d54248c 207 /* copy the hostname into buf */
donatien 0:013f5d54248c 208 MEMCPY(hostname, name, namelen);
donatien 0:013f5d54248c 209 hostname[namelen] = 0;
donatien 0:013f5d54248c 210
donatien 0:013f5d54248c 211 /* fill hostent */
donatien 0:013f5d54248c 212 h->addrs = &(h->addr);
donatien 0:013f5d54248c 213 h->aliases = NULL;
donatien 0:013f5d54248c 214 ret->h_name = (char*)hostname;
donatien 0:013f5d54248c 215 ret->h_aliases = &(h->aliases);
donatien 0:013f5d54248c 216 ret->h_addrtype = AF_INET;
donatien 0:013f5d54248c 217 ret->h_length = sizeof(ip_addr_t);
donatien 0:013f5d54248c 218 ret->h_addr_list = (char**)&(h->addrs);
donatien 0:013f5d54248c 219
donatien 0:013f5d54248c 220 /* set result != NULL */
donatien 0:013f5d54248c 221 *result = ret;
donatien 0:013f5d54248c 222
donatien 0:013f5d54248c 223 /* return success */
donatien 0:013f5d54248c 224 return 0;
donatien 0:013f5d54248c 225 }
donatien 0:013f5d54248c 226
donatien 0:013f5d54248c 227 /**
donatien 0:013f5d54248c 228 * Frees one or more addrinfo structures returned by getaddrinfo(), along with
donatien 0:013f5d54248c 229 * any additional storage associated with those structures. If the ai_next field
donatien 0:013f5d54248c 230 * of the structure is not null, the entire list of structures is freed.
donatien 0:013f5d54248c 231 *
donatien 0:013f5d54248c 232 * @param ai struct addrinfo to free
donatien 0:013f5d54248c 233 */
donatien 0:013f5d54248c 234 void
donatien 0:013f5d54248c 235 lwip_freeaddrinfo(struct addrinfo *ai)
donatien 0:013f5d54248c 236 {
donatien 0:013f5d54248c 237 struct addrinfo *next;
donatien 0:013f5d54248c 238
donatien 0:013f5d54248c 239 while (ai != NULL) {
donatien 0:013f5d54248c 240 next = ai->ai_next;
donatien 0:013f5d54248c 241 memp_free(MEMP_NETDB, ai);
donatien 0:013f5d54248c 242 ai = next;
donatien 0:013f5d54248c 243 }
donatien 0:013f5d54248c 244 }
donatien 0:013f5d54248c 245
donatien 0:013f5d54248c 246 /**
donatien 0:013f5d54248c 247 * Translates the name of a service location (for example, a host name) and/or
donatien 0:013f5d54248c 248 * a service name and returns a set of socket addresses and associated
donatien 0:013f5d54248c 249 * information to be used in creating a socket with which to address the
donatien 0:013f5d54248c 250 * specified service.
donatien 0:013f5d54248c 251 * Memory for the result is allocated internally and must be freed by calling
donatien 0:013f5d54248c 252 * lwip_freeaddrinfo()!
donatien 0:013f5d54248c 253 *
donatien 0:013f5d54248c 254 * Due to a limitation in dns_gethostbyname, only the first address of a
donatien 0:013f5d54248c 255 * host is returned.
donatien 0:013f5d54248c 256 * Also, service names are not supported (only port numbers)!
donatien 0:013f5d54248c 257 *
donatien 0:013f5d54248c 258 * @param nodename descriptive name or address string of the host
donatien 0:013f5d54248c 259 * (may be NULL -> local address)
donatien 0:013f5d54248c 260 * @param servname port number as string of NULL
donatien 0:013f5d54248c 261 * @param hints structure containing input values that set socktype and protocol
donatien 0:013f5d54248c 262 * @param res pointer to a pointer where to store the result (set to NULL on failure)
donatien 0:013f5d54248c 263 * @return 0 on success, non-zero on failure
donatien 0:013f5d54248c 264 */
donatien 0:013f5d54248c 265 int
donatien 0:013f5d54248c 266 lwip_getaddrinfo(const char *nodename, const char *servname,
donatien 0:013f5d54248c 267 const struct addrinfo *hints, struct addrinfo **res)
donatien 0:013f5d54248c 268 {
donatien 0:013f5d54248c 269 err_t err;
donatien 0:013f5d54248c 270 ip_addr_t addr;
donatien 0:013f5d54248c 271 struct addrinfo *ai;
donatien 0:013f5d54248c 272 struct sockaddr_in *sa = NULL;
donatien 0:013f5d54248c 273 int port_nr = 0;
donatien 0:013f5d54248c 274 size_t total_size;
donatien 0:013f5d54248c 275 size_t namelen = 0;
donatien 0:013f5d54248c 276
donatien 0:013f5d54248c 277 if (res == NULL) {
donatien 0:013f5d54248c 278 return EAI_FAIL;
donatien 0:013f5d54248c 279 }
donatien 0:013f5d54248c 280 *res = NULL;
donatien 0:013f5d54248c 281 if ((nodename == NULL) && (servname == NULL)) {
donatien 0:013f5d54248c 282 return EAI_NONAME;
donatien 0:013f5d54248c 283 }
donatien 0:013f5d54248c 284
donatien 0:013f5d54248c 285 if (servname != NULL) {
donatien 0:013f5d54248c 286 /* service name specified: convert to port number
donatien 0:013f5d54248c 287 * @todo?: currently, only ASCII integers (port numbers) are supported! */
donatien 0:013f5d54248c 288 port_nr = atoi(servname);
donatien 0:013f5d54248c 289 if ((port_nr <= 0) || (port_nr > 0xffff)) {
donatien 0:013f5d54248c 290 return EAI_SERVICE;
donatien 0:013f5d54248c 291 }
donatien 0:013f5d54248c 292 }
donatien 0:013f5d54248c 293
donatien 0:013f5d54248c 294 if (nodename != NULL) {
donatien 0:013f5d54248c 295 /* service location specified, try to resolve */
donatien 0:013f5d54248c 296 err = netconn_gethostbyname(nodename, &addr);
donatien 0:013f5d54248c 297 if (err != ERR_OK) {
donatien 0:013f5d54248c 298 return EAI_FAIL;
donatien 0:013f5d54248c 299 }
donatien 0:013f5d54248c 300 } else {
donatien 0:013f5d54248c 301 /* service location specified, use loopback address */
donatien 0:013f5d54248c 302 ip_addr_set_loopback(&addr);
donatien 0:013f5d54248c 303 }
donatien 0:013f5d54248c 304
donatien 0:013f5d54248c 305 total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
donatien 0:013f5d54248c 306 if (nodename != NULL) {
donatien 0:013f5d54248c 307 namelen = strlen(nodename);
donatien 0:013f5d54248c 308 LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
donatien 0:013f5d54248c 309 total_size += namelen + 1;
donatien 0:013f5d54248c 310 }
donatien 0:013f5d54248c 311 /* If this fails, please report to lwip-devel! :-) */
donatien 0:013f5d54248c 312 LWIP_ASSERT("total_size <= NETDB_ELEM_SIZE: please report this!",
donatien 0:013f5d54248c 313 total_size <= NETDB_ELEM_SIZE);
donatien 0:013f5d54248c 314 ai = (struct addrinfo *)memp_malloc(MEMP_NETDB);
donatien 0:013f5d54248c 315 if (ai == NULL) {
donatien 0:013f5d54248c 316 goto memerr;
donatien 0:013f5d54248c 317 }
donatien 0:013f5d54248c 318 memset(ai, 0, total_size);
donatien 0:013f5d54248c 319 sa = (struct sockaddr_in*)((u8_t*)ai + sizeof(struct addrinfo));
donatien 0:013f5d54248c 320 /* set up sockaddr */
donatien 0:013f5d54248c 321 inet_addr_from_ipaddr(&sa->sin_addr, &addr);
donatien 0:013f5d54248c 322 sa->sin_family = AF_INET;
donatien 0:013f5d54248c 323 sa->sin_len = sizeof(struct sockaddr_in);
donatien 0:013f5d54248c 324 sa->sin_port = htons((u16_t)port_nr);
donatien 0:013f5d54248c 325
donatien 0:013f5d54248c 326 /* set up addrinfo */
donatien 0:013f5d54248c 327 ai->ai_family = AF_INET;
donatien 0:013f5d54248c 328 if (hints != NULL) {
donatien 0:013f5d54248c 329 /* copy socktype & protocol from hints if specified */
donatien 0:013f5d54248c 330 ai->ai_socktype = hints->ai_socktype;
donatien 0:013f5d54248c 331 ai->ai_protocol = hints->ai_protocol;
donatien 0:013f5d54248c 332 }
donatien 0:013f5d54248c 333 if (nodename != NULL) {
donatien 0:013f5d54248c 334 /* copy nodename to canonname if specified */
donatien 0:013f5d54248c 335 ai->ai_canonname = ((char*)ai + sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
donatien 0:013f5d54248c 336 MEMCPY(ai->ai_canonname, nodename, namelen);
donatien 0:013f5d54248c 337 ai->ai_canonname[namelen] = 0;
donatien 0:013f5d54248c 338 }
donatien 0:013f5d54248c 339 ai->ai_addrlen = sizeof(struct sockaddr_in);
donatien 0:013f5d54248c 340 ai->ai_addr = (struct sockaddr*)sa;
donatien 0:013f5d54248c 341
donatien 0:013f5d54248c 342 *res = ai;
donatien 0:013f5d54248c 343
donatien 0:013f5d54248c 344 return 0;
donatien 0:013f5d54248c 345 memerr:
donatien 0:013f5d54248c 346 if (ai != NULL) {
donatien 0:013f5d54248c 347 memp_free(MEMP_NETDB, ai);
donatien 0:013f5d54248c 348 }
donatien 0:013f5d54248c 349 return EAI_MEMORY;
donatien 0:013f5d54248c 350 }
donatien 0:013f5d54248c 351
donatien 0:013f5d54248c 352 #endif /* LWIP_DNS && LWIP_SOCKET */