Michael Kersh / Mbed 2 deprecated ECE4180EthernetTest

Ethernet test for ECE 4180 and others to find your IP address and do a simple HTTP GET request over port 80.

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/api/netdb.c@0:e7ca326e76ee, 2013-04-04 (annotated)

Committer:
mkersh3
Date:
Thu Apr 04 05:26:09 2013 +0000
Revision:
0:e7ca326e76ee
Ethernet Test for ECE4180 and others to find their IP Address and do a simple HTTP GET request over port 80.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mkersh3 0:e7ca326e76ee 1 /**
mkersh3 0:e7ca326e76ee 2 * @file
mkersh3 0:e7ca326e76ee 3 * API functions for name resolving
mkersh3 0:e7ca326e76ee 4 *
mkersh3 0:e7ca326e76ee 5 */
mkersh3 0:e7ca326e76ee 6
mkersh3 0:e7ca326e76ee 7 /*
mkersh3 0:e7ca326e76ee 8 * Redistribution and use in source and binary forms, with or without modification,
mkersh3 0:e7ca326e76ee 9 * are permitted provided that the following conditions are met:
mkersh3 0:e7ca326e76ee 10 *
mkersh3 0:e7ca326e76ee 11 * 1. Redistributions of source code must retain the above copyright notice,
mkersh3 0:e7ca326e76ee 12 * this list of conditions and the following disclaimer.
mkersh3 0:e7ca326e76ee 13 * 2. Redistributions in binary form must reproduce the above copyright notice,
mkersh3 0:e7ca326e76ee 14 * this list of conditions and the following disclaimer in the documentation
mkersh3 0:e7ca326e76ee 15 * and/or other materials provided with the distribution.
mkersh3 0:e7ca326e76ee 16 * 3. The name of the author may not be used to endorse or promote products
mkersh3 0:e7ca326e76ee 17 * derived from this software without specific prior written permission.
mkersh3 0:e7ca326e76ee 18 *
mkersh3 0:e7ca326e76ee 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mkersh3 0:e7ca326e76ee 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mkersh3 0:e7ca326e76ee 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mkersh3 0:e7ca326e76ee 22 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mkersh3 0:e7ca326e76ee 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mkersh3 0:e7ca326e76ee 24 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mkersh3 0:e7ca326e76ee 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mkersh3 0:e7ca326e76ee 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mkersh3 0:e7ca326e76ee 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mkersh3 0:e7ca326e76ee 28 * OF SUCH DAMAGE.
mkersh3 0:e7ca326e76ee 29 *
mkersh3 0:e7ca326e76ee 30 * This file is part of the lwIP TCP/IP stack.
mkersh3 0:e7ca326e76ee 31 *
mkersh3 0:e7ca326e76ee 32 * Author: Simon Goldschmidt
mkersh3 0:e7ca326e76ee 33 *
mkersh3 0:e7ca326e76ee 34 */
mkersh3 0:e7ca326e76ee 35
mkersh3 0:e7ca326e76ee 36 #include "lwip/netdb.h"
mkersh3 0:e7ca326e76ee 37
mkersh3 0:e7ca326e76ee 38 #if LWIP_DNS && LWIP_SOCKET
mkersh3 0:e7ca326e76ee 39
mkersh3 0:e7ca326e76ee 40 #include "lwip/err.h"
mkersh3 0:e7ca326e76ee 41 #include "lwip/mem.h"
mkersh3 0:e7ca326e76ee 42 #include "lwip/memp.h"
mkersh3 0:e7ca326e76ee 43 #include "lwip/ip_addr.h"
mkersh3 0:e7ca326e76ee 44 #include "lwip/api.h"
mkersh3 0:e7ca326e76ee 45 #include "lwip/dns.h"
mkersh3 0:e7ca326e76ee 46
mkersh3 0:e7ca326e76ee 47 #include <string.h>
mkersh3 0:e7ca326e76ee 48 #include <stdlib.h>
mkersh3 0:e7ca326e76ee 49
mkersh3 0:e7ca326e76ee 50 /** helper struct for gethostbyname_r to access the char* buffer */
mkersh3 0:e7ca326e76ee 51 struct gethostbyname_r_helper {
mkersh3 0:e7ca326e76ee 52 ip_addr_t *addrs;
mkersh3 0:e7ca326e76ee 53 ip_addr_t addr;
mkersh3 0:e7ca326e76ee 54 char *aliases;
mkersh3 0:e7ca326e76ee 55 };
mkersh3 0:e7ca326e76ee 56
mkersh3 0:e7ca326e76ee 57 /** h_errno is exported in netdb.h for access by applications. */
mkersh3 0:e7ca326e76ee 58 #if LWIP_DNS_API_DECLARE_H_ERRNO
mkersh3 0:e7ca326e76ee 59 int h_errno;
mkersh3 0:e7ca326e76ee 60 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
mkersh3 0:e7ca326e76ee 61
mkersh3 0:e7ca326e76ee 62 /** define "hostent" variables storage: 0 if we use a static (but unprotected)
mkersh3 0:e7ca326e76ee 63 * set of variables for lwip_gethostbyname, 1 if we use a local storage */
mkersh3 0:e7ca326e76ee 64 #ifndef LWIP_DNS_API_HOSTENT_STORAGE
mkersh3 0:e7ca326e76ee 65 #define LWIP_DNS_API_HOSTENT_STORAGE 0
mkersh3 0:e7ca326e76ee 66 #endif
mkersh3 0:e7ca326e76ee 67
mkersh3 0:e7ca326e76ee 68 /** define "hostent" variables storage */
mkersh3 0:e7ca326e76ee 69 #if LWIP_DNS_API_HOSTENT_STORAGE
mkersh3 0:e7ca326e76ee 70 #define HOSTENT_STORAGE
mkersh3 0:e7ca326e76ee 71 #else
mkersh3 0:e7ca326e76ee 72 #define HOSTENT_STORAGE static
mkersh3 0:e7ca326e76ee 73 #endif /* LWIP_DNS_API_STATIC_HOSTENT */
mkersh3 0:e7ca326e76ee 74
mkersh3 0:e7ca326e76ee 75 /**
mkersh3 0:e7ca326e76ee 76 * Returns an entry containing addresses of address family AF_INET
mkersh3 0:e7ca326e76ee 77 * for the host with name name.
mkersh3 0:e7ca326e76ee 78 * Due to dns_gethostbyname limitations, only one address is returned.
mkersh3 0:e7ca326e76ee 79 *
mkersh3 0:e7ca326e76ee 80 * @param name the hostname to resolve
mkersh3 0:e7ca326e76ee 81 * @return an entry containing addresses of address family AF_INET
mkersh3 0:e7ca326e76ee 82 * for the host with name name
mkersh3 0:e7ca326e76ee 83 */
mkersh3 0:e7ca326e76ee 84 struct hostent*
mkersh3 0:e7ca326e76ee 85 lwip_gethostbyname(const char *name)
mkersh3 0:e7ca326e76ee 86 {
mkersh3 0:e7ca326e76ee 87 err_t err;
mkersh3 0:e7ca326e76ee 88 ip_addr_t addr;
mkersh3 0:e7ca326e76ee 89
mkersh3 0:e7ca326e76ee 90 /* buffer variables for lwip_gethostbyname() */
mkersh3 0:e7ca326e76ee 91 HOSTENT_STORAGE struct hostent s_hostent;
mkersh3 0:e7ca326e76ee 92 HOSTENT_STORAGE char *s_aliases;
mkersh3 0:e7ca326e76ee 93 HOSTENT_STORAGE ip_addr_t s_hostent_addr;
mkersh3 0:e7ca326e76ee 94 HOSTENT_STORAGE ip_addr_t *s_phostent_addr[2];
mkersh3 0:e7ca326e76ee 95
mkersh3 0:e7ca326e76ee 96 /* query host IP address */
mkersh3 0:e7ca326e76ee 97 err = netconn_gethostbyname(name, &addr);
mkersh3 0:e7ca326e76ee 98 if (err != ERR_OK) {
mkersh3 0:e7ca326e76ee 99 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
mkersh3 0:e7ca326e76ee 100 h_errno = HOST_NOT_FOUND;
mkersh3 0:e7ca326e76ee 101 return NULL;
mkersh3 0:e7ca326e76ee 102 }
mkersh3 0:e7ca326e76ee 103
mkersh3 0:e7ca326e76ee 104 /* fill hostent */
mkersh3 0:e7ca326e76ee 105 s_hostent_addr = addr;
mkersh3 0:e7ca326e76ee 106 s_phostent_addr[0] = &s_hostent_addr;
mkersh3 0:e7ca326e76ee 107 s_phostent_addr[1] = NULL;
mkersh3 0:e7ca326e76ee 108 s_hostent.h_name = (char*)name;
mkersh3 0:e7ca326e76ee 109 s_hostent.h_aliases = &s_aliases;
mkersh3 0:e7ca326e76ee 110 s_hostent.h_addrtype = AF_INET;
mkersh3 0:e7ca326e76ee 111 s_hostent.h_length = sizeof(ip_addr_t);
mkersh3 0:e7ca326e76ee 112 s_hostent.h_addr_list = (char**)&s_phostent_addr;
mkersh3 0:e7ca326e76ee 113
mkersh3 0:e7ca326e76ee 114 #if DNS_DEBUG
mkersh3 0:e7ca326e76ee 115 /* dump hostent */
mkersh3 0:e7ca326e76ee 116 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
mkersh3 0:e7ca326e76ee 117 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
mkersh3 0:e7ca326e76ee 118 if (s_hostent.h_aliases != NULL) {
mkersh3 0:e7ca326e76ee 119 u8_t idx;
mkersh3 0:e7ca326e76ee 120 for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
mkersh3 0:e7ca326e76ee 121 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
mkersh3 0:e7ca326e76ee 122 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
mkersh3 0:e7ca326e76ee 123 }
mkersh3 0:e7ca326e76ee 124 }
mkersh3 0:e7ca326e76ee 125 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
mkersh3 0:e7ca326e76ee 126 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
mkersh3 0:e7ca326e76ee 127 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
mkersh3 0:e7ca326e76ee 128 if (s_hostent.h_addr_list != NULL) {
mkersh3 0:e7ca326e76ee 129 u8_t idx;
mkersh3 0:e7ca326e76ee 130 for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
mkersh3 0:e7ca326e76ee 131 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
mkersh3 0:e7ca326e76ee 132 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i]-> == %s\n", idx, ip_ntoa((ip_addr_t*)s_hostent.h_addr_list[idx])));
mkersh3 0:e7ca326e76ee 133 }
mkersh3 0:e7ca326e76ee 134 }
mkersh3 0:e7ca326e76ee 135 #endif /* DNS_DEBUG */
mkersh3 0:e7ca326e76ee 136
mkersh3 0:e7ca326e76ee 137 #if LWIP_DNS_API_HOSTENT_STORAGE
mkersh3 0:e7ca326e76ee 138 /* this function should return the "per-thread" hostent after copy from s_hostent */
mkersh3 0:e7ca326e76ee 139 return sys_thread_hostent(&s_hostent);
mkersh3 0:e7ca326e76ee 140 #else
mkersh3 0:e7ca326e76ee 141 return &s_hostent;
mkersh3 0:e7ca326e76ee 142 #endif /* LWIP_DNS_API_HOSTENT_STORAGE */
mkersh3 0:e7ca326e76ee 143 }
mkersh3 0:e7ca326e76ee 144
mkersh3 0:e7ca326e76ee 145 /**
mkersh3 0:e7ca326e76ee 146 * Thread-safe variant of lwip_gethostbyname: instead of using a static
mkersh3 0:e7ca326e76ee 147 * buffer, this function takes buffer and errno pointers as arguments
mkersh3 0:e7ca326e76ee 148 * and uses these for the result.
mkersh3 0:e7ca326e76ee 149 *
mkersh3 0:e7ca326e76ee 150 * @param name the hostname to resolve
mkersh3 0:e7ca326e76ee 151 * @param ret pre-allocated struct where to store the result
mkersh3 0:e7ca326e76ee 152 * @param buf pre-allocated buffer where to store additional data
mkersh3 0:e7ca326e76ee 153 * @param buflen the size of buf
mkersh3 0:e7ca326e76ee 154 * @param result pointer to a hostent pointer that is set to ret on success
mkersh3 0:e7ca326e76ee 155 * and set to zero on error
mkersh3 0:e7ca326e76ee 156 * @param h_errnop pointer to an int where to store errors (instead of modifying
mkersh3 0:e7ca326e76ee 157 * the global h_errno)
mkersh3 0:e7ca326e76ee 158 * @return 0 on success, non-zero on error, additional error information
mkersh3 0:e7ca326e76ee 159 * is stored in *h_errnop instead of h_errno to be thread-safe
mkersh3 0:e7ca326e76ee 160 */
mkersh3 0:e7ca326e76ee 161 int
mkersh3 0:e7ca326e76ee 162 lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
mkersh3 0:e7ca326e76ee 163 size_t buflen, struct hostent **result, int *h_errnop)
mkersh3 0:e7ca326e76ee 164 {
mkersh3 0:e7ca326e76ee 165 err_t err;
mkersh3 0:e7ca326e76ee 166 struct gethostbyname_r_helper *h;
mkersh3 0:e7ca326e76ee 167 char *hostname;
mkersh3 0:e7ca326e76ee 168 size_t namelen;
mkersh3 0:e7ca326e76ee 169 int lh_errno;
mkersh3 0:e7ca326e76ee 170
mkersh3 0:e7ca326e76ee 171 if (h_errnop == NULL) {
mkersh3 0:e7ca326e76ee 172 /* ensure h_errnop is never NULL */
mkersh3 0:e7ca326e76ee 173 h_errnop = &lh_errno;
mkersh3 0:e7ca326e76ee 174 }
mkersh3 0:e7ca326e76ee 175
mkersh3 0:e7ca326e76ee 176 if (result == NULL) {
mkersh3 0:e7ca326e76ee 177 /* not all arguments given */
mkersh3 0:e7ca326e76ee 178 *h_errnop = EINVAL;
mkersh3 0:e7ca326e76ee 179 return -1;
mkersh3 0:e7ca326e76ee 180 }
mkersh3 0:e7ca326e76ee 181 /* first thing to do: set *result to nothing */
mkersh3 0:e7ca326e76ee 182 *result = NULL;
mkersh3 0:e7ca326e76ee 183 if ((name == NULL) || (ret == NULL) || (buf == 0)) {
mkersh3 0:e7ca326e76ee 184 /* not all arguments given */
mkersh3 0:e7ca326e76ee 185 *h_errnop = EINVAL;
mkersh3 0:e7ca326e76ee 186 return -1;
mkersh3 0:e7ca326e76ee 187 }
mkersh3 0:e7ca326e76ee 188
mkersh3 0:e7ca326e76ee 189 namelen = strlen(name);
mkersh3 0:e7ca326e76ee 190 if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
mkersh3 0:e7ca326e76ee 191 /* buf can't hold the data needed + a copy of name */
mkersh3 0:e7ca326e76ee 192 *h_errnop = ERANGE;
mkersh3 0:e7ca326e76ee 193 return -1;
mkersh3 0:e7ca326e76ee 194 }
mkersh3 0:e7ca326e76ee 195
mkersh3 0:e7ca326e76ee 196 h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
mkersh3 0:e7ca326e76ee 197 hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
mkersh3 0:e7ca326e76ee 198
mkersh3 0:e7ca326e76ee 199 /* query host IP address */
mkersh3 0:e7ca326e76ee 200 err = netconn_gethostbyname(name, &(h->addr));
mkersh3 0:e7ca326e76ee 201 if (err != ERR_OK) {
mkersh3 0:e7ca326e76ee 202 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
mkersh3 0:e7ca326e76ee 203 *h_errnop = ENSRNOTFOUND;
mkersh3 0:e7ca326e76ee 204 return -1;
mkersh3 0:e7ca326e76ee 205 }
mkersh3 0:e7ca326e76ee 206
mkersh3 0:e7ca326e76ee 207 /* copy the hostname into buf */
mkersh3 0:e7ca326e76ee 208 MEMCPY(hostname, name, namelen);
mkersh3 0:e7ca326e76ee 209 hostname[namelen] = 0;
mkersh3 0:e7ca326e76ee 210
mkersh3 0:e7ca326e76ee 211 /* fill hostent */
mkersh3 0:e7ca326e76ee 212 h->addrs = &(h->addr);
mkersh3 0:e7ca326e76ee 213 h->aliases = NULL;
mkersh3 0:e7ca326e76ee 214 ret->h_name = (char*)hostname;
mkersh3 0:e7ca326e76ee 215 ret->h_aliases = &(h->aliases);
mkersh3 0:e7ca326e76ee 216 ret->h_addrtype = AF_INET;
mkersh3 0:e7ca326e76ee 217 ret->h_length = sizeof(ip_addr_t);
mkersh3 0:e7ca326e76ee 218 ret->h_addr_list = (char**)&(h->addrs);
mkersh3 0:e7ca326e76ee 219
mkersh3 0:e7ca326e76ee 220 /* set result != NULL */
mkersh3 0:e7ca326e76ee 221 *result = ret;
mkersh3 0:e7ca326e76ee 222
mkersh3 0:e7ca326e76ee 223 /* return success */
mkersh3 0:e7ca326e76ee 224 return 0;
mkersh3 0:e7ca326e76ee 225 }
mkersh3 0:e7ca326e76ee 226
mkersh3 0:e7ca326e76ee 227 /**
mkersh3 0:e7ca326e76ee 228 * Frees one or more addrinfo structures returned by getaddrinfo(), along with
mkersh3 0:e7ca326e76ee 229 * any additional storage associated with those structures. If the ai_next field
mkersh3 0:e7ca326e76ee 230 * of the structure is not null, the entire list of structures is freed.
mkersh3 0:e7ca326e76ee 231 *
mkersh3 0:e7ca326e76ee 232 * @param ai struct addrinfo to free
mkersh3 0:e7ca326e76ee 233 */
mkersh3 0:e7ca326e76ee 234 void
mkersh3 0:e7ca326e76ee 235 lwip_freeaddrinfo(struct addrinfo *ai)
mkersh3 0:e7ca326e76ee 236 {
mkersh3 0:e7ca326e76ee 237 struct addrinfo *next;
mkersh3 0:e7ca326e76ee 238
mkersh3 0:e7ca326e76ee 239 while (ai != NULL) {
mkersh3 0:e7ca326e76ee 240 next = ai->ai_next;
mkersh3 0:e7ca326e76ee 241 memp_free(MEMP_NETDB, ai);
mkersh3 0:e7ca326e76ee 242 ai = next;
mkersh3 0:e7ca326e76ee 243 }
mkersh3 0:e7ca326e76ee 244 }
mkersh3 0:e7ca326e76ee 245
mkersh3 0:e7ca326e76ee 246 /**
mkersh3 0:e7ca326e76ee 247 * Translates the name of a service location (for example, a host name) and/or
mkersh3 0:e7ca326e76ee 248 * a service name and returns a set of socket addresses and associated
mkersh3 0:e7ca326e76ee 249 * information to be used in creating a socket with which to address the
mkersh3 0:e7ca326e76ee 250 * specified service.
mkersh3 0:e7ca326e76ee 251 * Memory for the result is allocated internally and must be freed by calling
mkersh3 0:e7ca326e76ee 252 * lwip_freeaddrinfo()!
mkersh3 0:e7ca326e76ee 253 *
mkersh3 0:e7ca326e76ee 254 * Due to a limitation in dns_gethostbyname, only the first address of a
mkersh3 0:e7ca326e76ee 255 * host is returned.
mkersh3 0:e7ca326e76ee 256 * Also, service names are not supported (only port numbers)!
mkersh3 0:e7ca326e76ee 257 *
mkersh3 0:e7ca326e76ee 258 * @param nodename descriptive name or address string of the host
mkersh3 0:e7ca326e76ee 259 * (may be NULL -> local address)
mkersh3 0:e7ca326e76ee 260 * @param servname port number as string of NULL
mkersh3 0:e7ca326e76ee 261 * @param hints structure containing input values that set socktype and protocol
mkersh3 0:e7ca326e76ee 262 * @param res pointer to a pointer where to store the result (set to NULL on failure)
mkersh3 0:e7ca326e76ee 263 * @return 0 on success, non-zero on failure
mkersh3 0:e7ca326e76ee 264 */
mkersh3 0:e7ca326e76ee 265 int
mkersh3 0:e7ca326e76ee 266 lwip_getaddrinfo(const char *nodename, const char *servname,
mkersh3 0:e7ca326e76ee 267 const struct addrinfo *hints, struct addrinfo **res)
mkersh3 0:e7ca326e76ee 268 {
mkersh3 0:e7ca326e76ee 269 err_t err;
mkersh3 0:e7ca326e76ee 270 ip_addr_t addr;
mkersh3 0:e7ca326e76ee 271 struct addrinfo *ai;
mkersh3 0:e7ca326e76ee 272 struct sockaddr_in *sa = NULL;
mkersh3 0:e7ca326e76ee 273 int port_nr = 0;
mkersh3 0:e7ca326e76ee 274 size_t total_size;
mkersh3 0:e7ca326e76ee 275 size_t namelen = 0;
mkersh3 0:e7ca326e76ee 276
mkersh3 0:e7ca326e76ee 277 if (res == NULL) {
mkersh3 0:e7ca326e76ee 278 return EAI_FAIL;
mkersh3 0:e7ca326e76ee 279 }
mkersh3 0:e7ca326e76ee 280 *res = NULL;
mkersh3 0:e7ca326e76ee 281 if ((nodename == NULL) && (servname == NULL)) {
mkersh3 0:e7ca326e76ee 282 return EAI_NONAME;
mkersh3 0:e7ca326e76ee 283 }
mkersh3 0:e7ca326e76ee 284
mkersh3 0:e7ca326e76ee 285 if (servname != NULL) {
mkersh3 0:e7ca326e76ee 286 /* service name specified: convert to port number
mkersh3 0:e7ca326e76ee 287 * @todo?: currently, only ASCII integers (port numbers) are supported! */
mkersh3 0:e7ca326e76ee 288 port_nr = atoi(servname);
mkersh3 0:e7ca326e76ee 289 if ((port_nr <= 0) || (port_nr > 0xffff)) {
mkersh3 0:e7ca326e76ee 290 return EAI_SERVICE;
mkersh3 0:e7ca326e76ee 291 }
mkersh3 0:e7ca326e76ee 292 }
mkersh3 0:e7ca326e76ee 293
mkersh3 0:e7ca326e76ee 294 if (nodename != NULL) {
mkersh3 0:e7ca326e76ee 295 /* service location specified, try to resolve */
mkersh3 0:e7ca326e76ee 296 err = netconn_gethostbyname(nodename, &addr);
mkersh3 0:e7ca326e76ee 297 if (err != ERR_OK) {
mkersh3 0:e7ca326e76ee 298 return EAI_FAIL;
mkersh3 0:e7ca326e76ee 299 }
mkersh3 0:e7ca326e76ee 300 } else {
mkersh3 0:e7ca326e76ee 301 /* service location specified, use loopback address */
mkersh3 0:e7ca326e76ee 302 ip_addr_set_loopback(&addr);
mkersh3 0:e7ca326e76ee 303 }
mkersh3 0:e7ca326e76ee 304
mkersh3 0:e7ca326e76ee 305 total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
mkersh3 0:e7ca326e76ee 306 if (nodename != NULL) {
mkersh3 0:e7ca326e76ee 307 namelen = strlen(nodename);
mkersh3 0:e7ca326e76ee 308 LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
mkersh3 0:e7ca326e76ee 309 total_size += namelen + 1;
mkersh3 0:e7ca326e76ee 310 }
mkersh3 0:e7ca326e76ee 311 /* If this fails, please report to lwip-devel! :-) */
mkersh3 0:e7ca326e76ee 312 LWIP_ASSERT("total_size <= NETDB_ELEM_SIZE: please report this!",
mkersh3 0:e7ca326e76ee 313 total_size <= NETDB_ELEM_SIZE);
mkersh3 0:e7ca326e76ee 314 ai = (struct addrinfo *)memp_malloc(MEMP_NETDB);
mkersh3 0:e7ca326e76ee 315 if (ai == NULL) {
mkersh3 0:e7ca326e76ee 316 goto memerr;
mkersh3 0:e7ca326e76ee 317 }
mkersh3 0:e7ca326e76ee 318 memset(ai, 0, total_size);
mkersh3 0:e7ca326e76ee 319 sa = (struct sockaddr_in*)((u8_t*)ai + sizeof(struct addrinfo));
mkersh3 0:e7ca326e76ee 320 /* set up sockaddr */
mkersh3 0:e7ca326e76ee 321 inet_addr_from_ipaddr(&sa->sin_addr, &addr);
mkersh3 0:e7ca326e76ee 322 sa->sin_family = AF_INET;
mkersh3 0:e7ca326e76ee 323 sa->sin_len = sizeof(struct sockaddr_in);
mkersh3 0:e7ca326e76ee 324 sa->sin_port = htons((u16_t)port_nr);
mkersh3 0:e7ca326e76ee 325
mkersh3 0:e7ca326e76ee 326 /* set up addrinfo */
mkersh3 0:e7ca326e76ee 327 ai->ai_family = AF_INET;
mkersh3 0:e7ca326e76ee 328 if (hints != NULL) {
mkersh3 0:e7ca326e76ee 329 /* copy socktype & protocol from hints if specified */
mkersh3 0:e7ca326e76ee 330 ai->ai_socktype = hints->ai_socktype;
mkersh3 0:e7ca326e76ee 331 ai->ai_protocol = hints->ai_protocol;
mkersh3 0:e7ca326e76ee 332 }
mkersh3 0:e7ca326e76ee 333 if (nodename != NULL) {
mkersh3 0:e7ca326e76ee 334 /* copy nodename to canonname if specified */
mkersh3 0:e7ca326e76ee 335 ai->ai_canonname = ((char*)ai + sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
mkersh3 0:e7ca326e76ee 336 MEMCPY(ai->ai_canonname, nodename, namelen);
mkersh3 0:e7ca326e76ee 337 ai->ai_canonname[namelen] = 0;
mkersh3 0:e7ca326e76ee 338 }
mkersh3 0:e7ca326e76ee 339 ai->ai_addrlen = sizeof(struct sockaddr_in);
mkersh3 0:e7ca326e76ee 340 ai->ai_addr = (struct sockaddr*)sa;
mkersh3 0:e7ca326e76ee 341
mkersh3 0:e7ca326e76ee 342 *res = ai;
mkersh3 0:e7ca326e76ee 343
mkersh3 0:e7ca326e76ee 344 return 0;
mkersh3 0:e7ca326e76ee 345 memerr:
mkersh3 0:e7ca326e76ee 346 if (ai != NULL) {
mkersh3 0:e7ca326e76ee 347 memp_free(MEMP_NETDB, ai);
mkersh3 0:e7ca326e76ee 348 }
mkersh3 0:e7ca326e76ee 349 return EAI_MEMORY;
mkersh3 0:e7ca326e76ee 350 }
mkersh3 0:e7ca326e76ee 351
mkersh3 0:e7ca326e76ee 352 #endif /* LWIP_DNS && LWIP_SOCKET */