Pascal Nysten / lwip

Adapted to Lora Semtech + Nucleo

Dependencies:   DebugLib

Dependents:   LoRaWAN-lmic-app LoRaWAN-lmic-app LoRaWAN-test-10secs LoRaPersonalizedDeviceForEverynet ... more

Fork of lwip_ppp_ethernet by Donatien Garnier

src/api/netdb.c@3:a9e6ba815945, 2015-11-20 (annotated)

Committer:
pnysten
Date:
Fri Nov 20 12:30:58 2015 +0000
Revision:
3:a9e6ba815945
Parent:
0:8e01dca41002 
Adapted to Nucleo, LoRa Semtech

Who changed what in which revision?

UserRevisionLine numberNew contents of line
donatien 0:8e01dca41002 1 /**
donatien 0:8e01dca41002 2 * @file
donatien 0:8e01dca41002 3 * API functions for name resolving
donatien 0:8e01dca41002 4 *
donatien 0:8e01dca41002 5 */
donatien 0:8e01dca41002 6
donatien 0:8e01dca41002 7 /*
donatien 0:8e01dca41002 8 * Redistribution and use in source and binary forms, with or without modification,
donatien 0:8e01dca41002 9 * are permitted provided that the following conditions are met:
donatien 0:8e01dca41002 10 *
donatien 0:8e01dca41002 11 * 1. Redistributions of source code must retain the above copyright notice,
donatien 0:8e01dca41002 12 * this list of conditions and the following disclaimer.
donatien 0:8e01dca41002 13 * 2. Redistributions in binary form must reproduce the above copyright notice,
donatien 0:8e01dca41002 14 * this list of conditions and the following disclaimer in the documentation
donatien 0:8e01dca41002 15 * and/or other materials provided with the distribution.
donatien 0:8e01dca41002 16 * 3. The name of the author may not be used to endorse or promote products
donatien 0:8e01dca41002 17 * derived from this software without specific prior written permission.
donatien 0:8e01dca41002 18 *
donatien 0:8e01dca41002 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien 0:8e01dca41002 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien 0:8e01dca41002 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien 0:8e01dca41002 22 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien 0:8e01dca41002 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien 0:8e01dca41002 24 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien 0:8e01dca41002 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien 0:8e01dca41002 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien 0:8e01dca41002 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien 0:8e01dca41002 28 * OF SUCH DAMAGE.
donatien 0:8e01dca41002 29 *
donatien 0:8e01dca41002 30 * This file is part of the lwIP TCP/IP stack.
donatien 0:8e01dca41002 31 *
donatien 0:8e01dca41002 32 * Author: Simon Goldschmidt
donatien 0:8e01dca41002 33 *
donatien 0:8e01dca41002 34 */
donatien 0:8e01dca41002 35
donatien 0:8e01dca41002 36 #include "lwip/netdb.h"
donatien 0:8e01dca41002 37
donatien 0:8e01dca41002 38 #if LWIP_DNS && LWIP_SOCKET
donatien 0:8e01dca41002 39
donatien 0:8e01dca41002 40 #include "lwip/err.h"
donatien 0:8e01dca41002 41 #include "lwip/mem.h"
donatien 0:8e01dca41002 42 #include "lwip/memp.h"
donatien 0:8e01dca41002 43 #include "lwip/ip_addr.h"
donatien 0:8e01dca41002 44 #include "lwip/api.h"
donatien 0:8e01dca41002 45 #include "lwip/dns.h"
donatien 0:8e01dca41002 46
donatien 0:8e01dca41002 47 #include <string.h>
donatien 0:8e01dca41002 48 #include <stdlib.h>
donatien 0:8e01dca41002 49
donatien 0:8e01dca41002 50 /** helper struct for gethostbyname_r to access the char* buffer */
donatien 0:8e01dca41002 51 struct gethostbyname_r_helper {
donatien 0:8e01dca41002 52 ip_addr_t *addrs;
donatien 0:8e01dca41002 53 ip_addr_t addr;
donatien 0:8e01dca41002 54 char *aliases;
donatien 0:8e01dca41002 55 };
donatien 0:8e01dca41002 56
donatien 0:8e01dca41002 57 /** h_errno is exported in netdb.h for access by applications. */
donatien 0:8e01dca41002 58 #if LWIP_DNS_API_DECLARE_H_ERRNO
donatien 0:8e01dca41002 59 int h_errno;
donatien 0:8e01dca41002 60 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
donatien 0:8e01dca41002 61
donatien 0:8e01dca41002 62 /** define "hostent" variables storage: 0 if we use a static (but unprotected)
donatien 0:8e01dca41002 63 * set of variables for lwip_gethostbyname, 1 if we use a local storage */
donatien 0:8e01dca41002 64 #ifndef LWIP_DNS_API_HOSTENT_STORAGE
donatien 0:8e01dca41002 65 #define LWIP_DNS_API_HOSTENT_STORAGE 0
donatien 0:8e01dca41002 66 #endif
donatien 0:8e01dca41002 67
donatien 0:8e01dca41002 68 /** define "hostent" variables storage */
donatien 0:8e01dca41002 69 #if LWIP_DNS_API_HOSTENT_STORAGE
donatien 0:8e01dca41002 70 #define HOSTENT_STORAGE
donatien 0:8e01dca41002 71 #else
donatien 0:8e01dca41002 72 #define HOSTENT_STORAGE static
donatien 0:8e01dca41002 73 #endif /* LWIP_DNS_API_STATIC_HOSTENT */
donatien 0:8e01dca41002 74
donatien 0:8e01dca41002 75 /**
donatien 0:8e01dca41002 76 * Returns an entry containing addresses of address family AF_INET
donatien 0:8e01dca41002 77 * for the host with name name.
donatien 0:8e01dca41002 78 * Due to dns_gethostbyname limitations, only one address is returned.
donatien 0:8e01dca41002 79 *
donatien 0:8e01dca41002 80 * @param name the hostname to resolve
donatien 0:8e01dca41002 81 * @return an entry containing addresses of address family AF_INET
donatien 0:8e01dca41002 82 * for the host with name name
donatien 0:8e01dca41002 83 */
donatien 0:8e01dca41002 84 struct hostent*
donatien 0:8e01dca41002 85 lwip_gethostbyname(const char *name)
donatien 0:8e01dca41002 86 {
donatien 0:8e01dca41002 87 err_t err;
donatien 0:8e01dca41002 88 ip_addr_t addr;
donatien 0:8e01dca41002 89
donatien 0:8e01dca41002 90 /* buffer variables for lwip_gethostbyname() */
donatien 0:8e01dca41002 91 HOSTENT_STORAGE struct hostent s_hostent;
donatien 0:8e01dca41002 92 HOSTENT_STORAGE char *s_aliases;
donatien 0:8e01dca41002 93 HOSTENT_STORAGE ip_addr_t s_hostent_addr;
donatien 0:8e01dca41002 94 HOSTENT_STORAGE ip_addr_t *s_phostent_addr[2];
donatien 0:8e01dca41002 95
donatien 0:8e01dca41002 96 /* query host IP address */
donatien 0:8e01dca41002 97 err = netconn_gethostbyname(name, &addr);
donatien 0:8e01dca41002 98 if (err != ERR_OK) {
donatien 0:8e01dca41002 99 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
donatien 0:8e01dca41002 100 h_errno = HOST_NOT_FOUND;
donatien 0:8e01dca41002 101 return NULL;
donatien 0:8e01dca41002 102 }
donatien 0:8e01dca41002 103
donatien 0:8e01dca41002 104 /* fill hostent */
donatien 0:8e01dca41002 105 s_hostent_addr = addr;
donatien 0:8e01dca41002 106 s_phostent_addr[0] = &s_hostent_addr;
donatien 0:8e01dca41002 107 s_phostent_addr[1] = NULL;
donatien 0:8e01dca41002 108 s_hostent.h_name = (char*)name;
donatien 0:8e01dca41002 109 s_hostent.h_aliases = &s_aliases;
donatien 0:8e01dca41002 110 s_hostent.h_addrtype = AF_INET;
donatien 0:8e01dca41002 111 s_hostent.h_length = sizeof(ip_addr_t);
donatien 0:8e01dca41002 112 s_hostent.h_addr_list = (char**)&s_phostent_addr;
donatien 0:8e01dca41002 113
donatien 0:8e01dca41002 114 #if DNS_DEBUG
donatien 0:8e01dca41002 115 /* dump hostent */
donatien 0:8e01dca41002 116 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
donatien 0:8e01dca41002 117 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
donatien 0:8e01dca41002 118 if (s_hostent.h_aliases != NULL) {
donatien 0:8e01dca41002 119 u8_t idx;
donatien 0:8e01dca41002 120 for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
donatien 0:8e01dca41002 121 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
donatien 0:8e01dca41002 122 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
donatien 0:8e01dca41002 123 }
donatien 0:8e01dca41002 124 }
donatien 0:8e01dca41002 125 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
donatien 0:8e01dca41002 126 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
donatien 0:8e01dca41002 127 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
donatien 0:8e01dca41002 128 if (s_hostent.h_addr_list != NULL) {
donatien 0:8e01dca41002 129 u8_t idx;
donatien 0:8e01dca41002 130 for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
donatien 0:8e01dca41002 131 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
donatien 0:8e01dca41002 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 0:8e01dca41002 133 }
donatien 0:8e01dca41002 134 }
donatien 0:8e01dca41002 135 #endif /* DNS_DEBUG */
donatien 0:8e01dca41002 136
donatien 0:8e01dca41002 137 #if LWIP_DNS_API_HOSTENT_STORAGE
donatien 0:8e01dca41002 138 /* this function should return the "per-thread" hostent after copy from s_hostent */
donatien 0:8e01dca41002 139 return sys_thread_hostent(&s_hostent);
donatien 0:8e01dca41002 140 #else
donatien 0:8e01dca41002 141 return &s_hostent;
donatien 0:8e01dca41002 142 #endif /* LWIP_DNS_API_HOSTENT_STORAGE */
donatien 0:8e01dca41002 143 }
donatien 0:8e01dca41002 144
donatien 0:8e01dca41002 145 /**
donatien 0:8e01dca41002 146 * Thread-safe variant of lwip_gethostbyname: instead of using a static
donatien 0:8e01dca41002 147 * buffer, this function takes buffer and errno pointers as arguments
donatien 0:8e01dca41002 148 * and uses these for the result.
donatien 0:8e01dca41002 149 *
donatien 0:8e01dca41002 150 * @param name the hostname to resolve
donatien 0:8e01dca41002 151 * @param ret pre-allocated struct where to store the result
donatien 0:8e01dca41002 152 * @param buf pre-allocated buffer where to store additional data
donatien 0:8e01dca41002 153 * @param buflen the size of buf
donatien 0:8e01dca41002 154 * @param result pointer to a hostent pointer that is set to ret on success
donatien 0:8e01dca41002 155 * and set to zero on error
donatien 0:8e01dca41002 156 * @param h_errnop pointer to an int where to store errors (instead of modifying
donatien 0:8e01dca41002 157 * the global h_errno)
donatien 0:8e01dca41002 158 * @return 0 on success, non-zero on error, additional error information
donatien 0:8e01dca41002 159 * is stored in *h_errnop instead of h_errno to be thread-safe
donatien 0:8e01dca41002 160 */
donatien 0:8e01dca41002 161 int
donatien 0:8e01dca41002 162 lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
donatien 0:8e01dca41002 163 size_t buflen, struct hostent **result, int *h_errnop)
donatien 0:8e01dca41002 164 {
donatien 0:8e01dca41002 165 err_t err;
donatien 0:8e01dca41002 166 struct gethostbyname_r_helper *h;
donatien 0:8e01dca41002 167 char *hostname;
donatien 0:8e01dca41002 168 size_t namelen;
donatien 0:8e01dca41002 169 int lh_errno;
donatien 0:8e01dca41002 170
donatien 0:8e01dca41002 171 if (h_errnop == NULL) {
donatien 0:8e01dca41002 172 /* ensure h_errnop is never NULL */
donatien 0:8e01dca41002 173 h_errnop = &lh_errno;
donatien 0:8e01dca41002 174 }
donatien 0:8e01dca41002 175
donatien 0:8e01dca41002 176 if (result == NULL) {
donatien 0:8e01dca41002 177 /* not all arguments given */
donatien 0:8e01dca41002 178 *h_errnop = EINVAL;
donatien 0:8e01dca41002 179 return -1;
donatien 0:8e01dca41002 180 }
donatien 0:8e01dca41002 181 /* first thing to do: set *result to nothing */
donatien 0:8e01dca41002 182 *result = NULL;
donatien 0:8e01dca41002 183 if ((name == NULL) || (ret == NULL) || (buf == 0)) {
donatien 0:8e01dca41002 184 /* not all arguments given */
donatien 0:8e01dca41002 185 *h_errnop = EINVAL;
donatien 0:8e01dca41002 186 return -1;
donatien 0:8e01dca41002 187 }
donatien 0:8e01dca41002 188
donatien 0:8e01dca41002 189 namelen = strlen(name);
donatien 0:8e01dca41002 190 if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
donatien 0:8e01dca41002 191 /* buf can't hold the data needed + a copy of name */
donatien 0:8e01dca41002 192 *h_errnop = ERANGE;
donatien 0:8e01dca41002 193 return -1;
donatien 0:8e01dca41002 194 }
donatien 0:8e01dca41002 195
donatien 0:8e01dca41002 196 h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
donatien 0:8e01dca41002 197 hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
donatien 0:8e01dca41002 198
donatien 0:8e01dca41002 199 /* query host IP address */
donatien 0:8e01dca41002 200 err = netconn_gethostbyname(name, &(h->addr));
donatien 0:8e01dca41002 201 if (err != ERR_OK) {
donatien 0:8e01dca41002 202 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
donatien 0:8e01dca41002 203 *h_errnop = ENSRNOTFOUND;
donatien 0:8e01dca41002 204 return -1;
donatien 0:8e01dca41002 205 }
donatien 0:8e01dca41002 206
donatien 0:8e01dca41002 207 /* copy the hostname into buf */
donatien 0:8e01dca41002 208 MEMCPY(hostname, name, namelen);
donatien 0:8e01dca41002 209 hostname[namelen] = 0;
donatien 0:8e01dca41002 210
donatien 0:8e01dca41002 211 /* fill hostent */
donatien 0:8e01dca41002 212 h->addrs = &(h->addr);
donatien 0:8e01dca41002 213 h->aliases = NULL;
donatien 0:8e01dca41002 214 ret->h_name = (char*)hostname;
donatien 0:8e01dca41002 215 ret->h_aliases = &(h->aliases);
donatien 0:8e01dca41002 216 ret->h_addrtype = AF_INET;
donatien 0:8e01dca41002 217 ret->h_length = sizeof(ip_addr_t);
donatien 0:8e01dca41002 218 ret->h_addr_list = (char**)&(h->addrs);
donatien 0:8e01dca41002 219
donatien 0:8e01dca41002 220 /* set result != NULL */
donatien 0:8e01dca41002 221 *result = ret;
donatien 0:8e01dca41002 222
donatien 0:8e01dca41002 223 /* return success */
donatien 0:8e01dca41002 224 return 0;
donatien 0:8e01dca41002 225 }
donatien 0:8e01dca41002 226
donatien 0:8e01dca41002 227 /**
donatien 0:8e01dca41002 228 * Frees one or more addrinfo structures returned by getaddrinfo(), along with
donatien 0:8e01dca41002 229 * any additional storage associated with those structures. If the ai_next field
donatien 0:8e01dca41002 230 * of the structure is not null, the entire list of structures is freed.
donatien 0:8e01dca41002 231 *
donatien 0:8e01dca41002 232 * @param ai struct addrinfo to free
donatien 0:8e01dca41002 233 */
donatien 0:8e01dca41002 234 void
donatien 0:8e01dca41002 235 lwip_freeaddrinfo(struct addrinfo *ai)
donatien 0:8e01dca41002 236 {
donatien 0:8e01dca41002 237 struct addrinfo *next;
donatien 0:8e01dca41002 238
donatien 0:8e01dca41002 239 while (ai != NULL) {
donatien 0:8e01dca41002 240 next = ai->ai_next;
donatien 0:8e01dca41002 241 memp_free(MEMP_NETDB, ai);
donatien 0:8e01dca41002 242 ai = next;
donatien 0:8e01dca41002 243 }
donatien 0:8e01dca41002 244 }
donatien 0:8e01dca41002 245
donatien 0:8e01dca41002 246 /**
donatien 0:8e01dca41002 247 * Translates the name of a service location (for example, a host name) and/or
donatien 0:8e01dca41002 248 * a service name and returns a set of socket addresses and associated
donatien 0:8e01dca41002 249 * information to be used in creating a socket with which to address the
donatien 0:8e01dca41002 250 * specified service.
donatien 0:8e01dca41002 251 * Memory for the result is allocated internally and must be freed by calling
donatien 0:8e01dca41002 252 * lwip_freeaddrinfo()!
donatien 0:8e01dca41002 253 *
donatien 0:8e01dca41002 254 * Due to a limitation in dns_gethostbyname, only the first address of a
donatien 0:8e01dca41002 255 * host is returned.
donatien 0:8e01dca41002 256 * Also, service names are not supported (only port numbers)!
donatien 0:8e01dca41002 257 *
donatien 0:8e01dca41002 258 * @param nodename descriptive name or address string of the host
donatien 0:8e01dca41002 259 * (may be NULL -> local address)
donatien 0:8e01dca41002 260 * @param servname port number as string of NULL
donatien 0:8e01dca41002 261 * @param hints structure containing input values that set socktype and protocol
donatien 0:8e01dca41002 262 * @param res pointer to a pointer where to store the result (set to NULL on failure)
donatien 0:8e01dca41002 263 * @return 0 on success, non-zero on failure
donatien 0:8e01dca41002 264 */
donatien 0:8e01dca41002 265 int
donatien 0:8e01dca41002 266 lwip_getaddrinfo(const char *nodename, const char *servname,
donatien 0:8e01dca41002 267 const struct addrinfo *hints, struct addrinfo **res)
donatien 0:8e01dca41002 268 {
donatien 0:8e01dca41002 269 err_t err;
donatien 0:8e01dca41002 270 ip_addr_t addr;
donatien 0:8e01dca41002 271 struct addrinfo *ai;
donatien 0:8e01dca41002 272 struct sockaddr_in *sa = NULL;
donatien 0:8e01dca41002 273 int port_nr = 0;
donatien 0:8e01dca41002 274 size_t total_size;
donatien 0:8e01dca41002 275 size_t namelen = 0;
donatien 0:8e01dca41002 276
donatien 0:8e01dca41002 277 if (res == NULL) {
donatien 0:8e01dca41002 278 return EAI_FAIL;
donatien 0:8e01dca41002 279 }
donatien 0:8e01dca41002 280 *res = NULL;
donatien 0:8e01dca41002 281 if ((nodename == NULL) && (servname == NULL)) {
donatien 0:8e01dca41002 282 return EAI_NONAME;
donatien 0:8e01dca41002 283 }
donatien 0:8e01dca41002 284
donatien 0:8e01dca41002 285 if (servname != NULL) {
donatien 0:8e01dca41002 286 /* service name specified: convert to port number
donatien 0:8e01dca41002 287 * @todo?: currently, only ASCII integers (port numbers) are supported! */
donatien 0:8e01dca41002 288 port_nr = atoi(servname);
donatien 0:8e01dca41002 289 if ((port_nr <= 0) || (port_nr > 0xffff)) {
donatien 0:8e01dca41002 290 return EAI_SERVICE;
donatien 0:8e01dca41002 291 }
donatien 0:8e01dca41002 292 }
donatien 0:8e01dca41002 293
donatien 0:8e01dca41002 294 if (nodename != NULL) {
donatien 0:8e01dca41002 295 /* service location specified, try to resolve */
donatien 0:8e01dca41002 296 err = netconn_gethostbyname(nodename, &addr);
donatien 0:8e01dca41002 297 if (err != ERR_OK) {
donatien 0:8e01dca41002 298 return EAI_FAIL;
donatien 0:8e01dca41002 299 }
donatien 0:8e01dca41002 300 } else {
donatien 0:8e01dca41002 301 /* service location specified, use loopback address */
donatien 0:8e01dca41002 302 ip_addr_set_loopback(&addr);
donatien 0:8e01dca41002 303 }
donatien 0:8e01dca41002 304
donatien 0:8e01dca41002 305 total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
donatien 0:8e01dca41002 306 if (nodename != NULL) {
donatien 0:8e01dca41002 307 namelen = strlen(nodename);
donatien 0:8e01dca41002 308 LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
donatien 0:8e01dca41002 309 total_size += namelen + 1;
donatien 0:8e01dca41002 310 }
donatien 0:8e01dca41002 311 /* If this fails, please report to lwip-devel! :-) */
donatien 0:8e01dca41002 312 LWIP_ASSERT("total_size <= NETDB_ELEM_SIZE: please report this!",
donatien 0:8e01dca41002 313 total_size <= NETDB_ELEM_SIZE);
donatien 0:8e01dca41002 314 ai = (struct addrinfo *)memp_malloc(MEMP_NETDB);
donatien 0:8e01dca41002 315 if (ai == NULL) {
donatien 0:8e01dca41002 316 goto memerr;
donatien 0:8e01dca41002 317 }
donatien 0:8e01dca41002 318 memset(ai, 0, total_size);
donatien 0:8e01dca41002 319 sa = (struct sockaddr_in*)((u8_t*)ai + sizeof(struct addrinfo));
donatien 0:8e01dca41002 320 /* set up sockaddr */
donatien 0:8e01dca41002 321 inet_addr_from_ipaddr(&sa->sin_addr, &addr);
donatien 0:8e01dca41002 322 sa->sin_family = AF_INET;
donatien 0:8e01dca41002 323 sa->sin_len = sizeof(struct sockaddr_in);
donatien 0:8e01dca41002 324 sa->sin_port = htons((u16_t)port_nr);
donatien 0:8e01dca41002 325
donatien 0:8e01dca41002 326 /* set up addrinfo */
donatien 0:8e01dca41002 327 ai->ai_family = AF_INET;
donatien 0:8e01dca41002 328 if (hints != NULL) {
donatien 0:8e01dca41002 329 /* copy socktype & protocol from hints if specified */
donatien 0:8e01dca41002 330 ai->ai_socktype = hints->ai_socktype;
donatien 0:8e01dca41002 331 ai->ai_protocol = hints->ai_protocol;
donatien 0:8e01dca41002 332 }
donatien 0:8e01dca41002 333 if (nodename != NULL) {
donatien 0:8e01dca41002 334 /* copy nodename to canonname if specified */
donatien 0:8e01dca41002 335 ai->ai_canonname = ((char*)ai + sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
donatien 0:8e01dca41002 336 MEMCPY(ai->ai_canonname, nodename, namelen);
donatien 0:8e01dca41002 337 ai->ai_canonname[namelen] = 0;
donatien 0:8e01dca41002 338 }
donatien 0:8e01dca41002 339 ai->ai_addrlen = sizeof(struct sockaddr_in);
donatien 0:8e01dca41002 340 ai->ai_addr = (struct sockaddr*)sa;
donatien 0:8e01dca41002 341
donatien 0:8e01dca41002 342 *res = ai;
donatien 0:8e01dca41002 343
donatien 0:8e01dca41002 344 return 0;
donatien 0:8e01dca41002 345 memerr:
donatien 0:8e01dca41002 346 if (ai != NULL) {
donatien 0:8e01dca41002 347 memp_free(MEMP_NETDB, ai);
donatien 0:8e01dca41002 348 }
donatien 0:8e01dca41002 349 return EAI_MEMORY;
donatien 0:8e01dca41002 350 }
donatien 0:8e01dca41002 351
donatien 0:8e01dca41002 352 #endif /* LWIP_DNS && LWIP_SOCKET */