Adam Green / EthernetInterface

Deprecated fork of old network stack source from github. Please use official library instead: https://mbed.org/users/mbed_official/code/EthernetInterface/

lwip/api/netdb.c@1:eadc868c2acf, 2013-10-26 (annotated)

Committer:
AdamGreen
Date:
Sat Oct 26 08:51:36 2013 +0000
Revision:
1:eadc868c2acf
Parent:
0:3b00827bb0b7 
Fix TCP checksum bug and stranded large TCP segments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AdamGreen 0:3b00827bb0b7 1 /**
AdamGreen 0:3b00827bb0b7 2 * @file
AdamGreen 0:3b00827bb0b7 3 * API functions for name resolving
AdamGreen 0:3b00827bb0b7 4 *
AdamGreen 0:3b00827bb0b7 5 */
AdamGreen 0:3b00827bb0b7 6
AdamGreen 0:3b00827bb0b7 7 /*
AdamGreen 0:3b00827bb0b7 8 * Redistribution and use in source and binary forms, with or without modification,
AdamGreen 0:3b00827bb0b7 9 * are permitted provided that the following conditions are met:
AdamGreen 0:3b00827bb0b7 10 *
AdamGreen 0:3b00827bb0b7 11 * 1. Redistributions of source code must retain the above copyright notice,
AdamGreen 0:3b00827bb0b7 12 * this list of conditions and the following disclaimer.
AdamGreen 0:3b00827bb0b7 13 * 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen 0:3b00827bb0b7 14 * this list of conditions and the following disclaimer in the documentation
AdamGreen 0:3b00827bb0b7 15 * and/or other materials provided with the distribution.
AdamGreen 0:3b00827bb0b7 16 * 3. The name of the author may not be used to endorse or promote products
AdamGreen 0:3b00827bb0b7 17 * derived from this software without specific prior written permission.
AdamGreen 0:3b00827bb0b7 18 *
AdamGreen 0:3b00827bb0b7 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen 0:3b00827bb0b7 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen 0:3b00827bb0b7 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen 0:3b00827bb0b7 22 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen 0:3b00827bb0b7 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen 0:3b00827bb0b7 24 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen 0:3b00827bb0b7 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen 0:3b00827bb0b7 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen 0:3b00827bb0b7 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen 0:3b00827bb0b7 28 * OF SUCH DAMAGE.
AdamGreen 0:3b00827bb0b7 29 *
AdamGreen 0:3b00827bb0b7 30 * This file is part of the lwIP TCP/IP stack.
AdamGreen 0:3b00827bb0b7 31 *
AdamGreen 0:3b00827bb0b7 32 * Author: Simon Goldschmidt
AdamGreen 0:3b00827bb0b7 33 *
AdamGreen 0:3b00827bb0b7 34 */
AdamGreen 0:3b00827bb0b7 35
AdamGreen 0:3b00827bb0b7 36 #include "lwip/netdb.h"
AdamGreen 0:3b00827bb0b7 37
AdamGreen 0:3b00827bb0b7 38 #if LWIP_DNS && LWIP_SOCKET
AdamGreen 0:3b00827bb0b7 39
AdamGreen 0:3b00827bb0b7 40 #include "lwip/err.h"
AdamGreen 0:3b00827bb0b7 41 #include "lwip/mem.h"
AdamGreen 0:3b00827bb0b7 42 #include "lwip/memp.h"
AdamGreen 0:3b00827bb0b7 43 #include "lwip/ip_addr.h"
AdamGreen 0:3b00827bb0b7 44 #include "lwip/api.h"
AdamGreen 0:3b00827bb0b7 45 #include "lwip/dns.h"
AdamGreen 0:3b00827bb0b7 46
AdamGreen 0:3b00827bb0b7 47 #include <string.h>
AdamGreen 0:3b00827bb0b7 48 #include <stdlib.h>
AdamGreen 0:3b00827bb0b7 49
AdamGreen 0:3b00827bb0b7 50 /** helper struct for gethostbyname_r to access the char* buffer */
AdamGreen 0:3b00827bb0b7 51 struct gethostbyname_r_helper {
AdamGreen 0:3b00827bb0b7 52 ip_addr_t *addrs;
AdamGreen 0:3b00827bb0b7 53 ip_addr_t addr;
AdamGreen 0:3b00827bb0b7 54 char *aliases;
AdamGreen 0:3b00827bb0b7 55 };
AdamGreen 0:3b00827bb0b7 56
AdamGreen 0:3b00827bb0b7 57 /** h_errno is exported in netdb.h for access by applications. */
AdamGreen 0:3b00827bb0b7 58 #if LWIP_DNS_API_DECLARE_H_ERRNO
AdamGreen 0:3b00827bb0b7 59 int h_errno;
AdamGreen 0:3b00827bb0b7 60 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
AdamGreen 0:3b00827bb0b7 61
AdamGreen 0:3b00827bb0b7 62 /** define "hostent" variables storage: 0 if we use a static (but unprotected)
AdamGreen 0:3b00827bb0b7 63 * set of variables for lwip_gethostbyname, 1 if we use a local storage */
AdamGreen 0:3b00827bb0b7 64 #ifndef LWIP_DNS_API_HOSTENT_STORAGE
AdamGreen 0:3b00827bb0b7 65 #define LWIP_DNS_API_HOSTENT_STORAGE 0
AdamGreen 0:3b00827bb0b7 66 #endif
AdamGreen 0:3b00827bb0b7 67
AdamGreen 0:3b00827bb0b7 68 /** define "hostent" variables storage */
AdamGreen 0:3b00827bb0b7 69 #if LWIP_DNS_API_HOSTENT_STORAGE
AdamGreen 0:3b00827bb0b7 70 #define HOSTENT_STORAGE
AdamGreen 0:3b00827bb0b7 71 #else
AdamGreen 0:3b00827bb0b7 72 #define HOSTENT_STORAGE static
AdamGreen 0:3b00827bb0b7 73 #endif /* LWIP_DNS_API_STATIC_HOSTENT */
AdamGreen 0:3b00827bb0b7 74
AdamGreen 0:3b00827bb0b7 75 /**
AdamGreen 0:3b00827bb0b7 76 * Returns an entry containing addresses of address family AF_INET
AdamGreen 0:3b00827bb0b7 77 * for the host with name name.
AdamGreen 0:3b00827bb0b7 78 * Due to dns_gethostbyname limitations, only one address is returned.
AdamGreen 0:3b00827bb0b7 79 *
AdamGreen 0:3b00827bb0b7 80 * @param name the hostname to resolve
AdamGreen 0:3b00827bb0b7 81 * @return an entry containing addresses of address family AF_INET
AdamGreen 0:3b00827bb0b7 82 * for the host with name name
AdamGreen 0:3b00827bb0b7 83 */
AdamGreen 0:3b00827bb0b7 84 struct hostent*
AdamGreen 0:3b00827bb0b7 85 lwip_gethostbyname(const char *name)
AdamGreen 0:3b00827bb0b7 86 {
AdamGreen 0:3b00827bb0b7 87 err_t err;
AdamGreen 0:3b00827bb0b7 88 ip_addr_t addr;
AdamGreen 0:3b00827bb0b7 89
AdamGreen 0:3b00827bb0b7 90 /* buffer variables for lwip_gethostbyname() */
AdamGreen 0:3b00827bb0b7 91 HOSTENT_STORAGE struct hostent s_hostent;
AdamGreen 0:3b00827bb0b7 92 HOSTENT_STORAGE char *s_aliases;
AdamGreen 0:3b00827bb0b7 93 HOSTENT_STORAGE ip_addr_t s_hostent_addr;
AdamGreen 0:3b00827bb0b7 94 HOSTENT_STORAGE ip_addr_t *s_phostent_addr[2];
AdamGreen 0:3b00827bb0b7 95
AdamGreen 0:3b00827bb0b7 96 /* query host IP address */
AdamGreen 0:3b00827bb0b7 97 err = netconn_gethostbyname(name, &addr);
AdamGreen 0:3b00827bb0b7 98 if (err != ERR_OK) {
AdamGreen 0:3b00827bb0b7 99 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
AdamGreen 0:3b00827bb0b7 100 h_errno = HOST_NOT_FOUND;
AdamGreen 0:3b00827bb0b7 101 return NULL;
AdamGreen 0:3b00827bb0b7 102 }
AdamGreen 0:3b00827bb0b7 103
AdamGreen 0:3b00827bb0b7 104 /* fill hostent */
AdamGreen 0:3b00827bb0b7 105 s_hostent_addr = addr;
AdamGreen 0:3b00827bb0b7 106 s_phostent_addr[0] = &s_hostent_addr;
AdamGreen 0:3b00827bb0b7 107 s_phostent_addr[1] = NULL;
AdamGreen 0:3b00827bb0b7 108 s_hostent.h_name = (char*)name;
AdamGreen 0:3b00827bb0b7 109 s_hostent.h_aliases = &s_aliases;
AdamGreen 0:3b00827bb0b7 110 s_hostent.h_addrtype = AF_INET;
AdamGreen 0:3b00827bb0b7 111 s_hostent.h_length = sizeof(ip_addr_t);
AdamGreen 0:3b00827bb0b7 112 s_hostent.h_addr_list = (char**)&s_phostent_addr;
AdamGreen 0:3b00827bb0b7 113
AdamGreen 0:3b00827bb0b7 114 #if DNS_DEBUG
AdamGreen 0:3b00827bb0b7 115 /* dump hostent */
AdamGreen 0:3b00827bb0b7 116 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
AdamGreen 0:3b00827bb0b7 117 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
AdamGreen 0:3b00827bb0b7 118 if (s_hostent.h_aliases != NULL) {
AdamGreen 0:3b00827bb0b7 119 u8_t idx;
AdamGreen 0:3b00827bb0b7 120 for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
AdamGreen 0:3b00827bb0b7 121 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
AdamGreen 0:3b00827bb0b7 122 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
AdamGreen 0:3b00827bb0b7 123 }
AdamGreen 0:3b00827bb0b7 124 }
AdamGreen 0:3b00827bb0b7 125 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
AdamGreen 0:3b00827bb0b7 126 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
AdamGreen 0:3b00827bb0b7 127 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
AdamGreen 0:3b00827bb0b7 128 if (s_hostent.h_addr_list != NULL) {
AdamGreen 0:3b00827bb0b7 129 u8_t idx;
AdamGreen 0:3b00827bb0b7 130 for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
AdamGreen 0:3b00827bb0b7 131 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
AdamGreen 0:3b00827bb0b7 132 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i]-> == %s\n", idx, ip_ntoa((ip_addr_t*)s_hostent.h_addr_list[idx])));
AdamGreen 0:3b00827bb0b7 133 }
AdamGreen 0:3b00827bb0b7 134 }
AdamGreen 0:3b00827bb0b7 135 #endif /* DNS_DEBUG */
AdamGreen 0:3b00827bb0b7 136
AdamGreen 0:3b00827bb0b7 137 #if LWIP_DNS_API_HOSTENT_STORAGE
AdamGreen 0:3b00827bb0b7 138 /* this function should return the "per-thread" hostent after copy from s_hostent */
AdamGreen 0:3b00827bb0b7 139 return sys_thread_hostent(&s_hostent);
AdamGreen 0:3b00827bb0b7 140 #else
AdamGreen 0:3b00827bb0b7 141 return &s_hostent;
AdamGreen 0:3b00827bb0b7 142 #endif /* LWIP_DNS_API_HOSTENT_STORAGE */
AdamGreen 0:3b00827bb0b7 143 }
AdamGreen 0:3b00827bb0b7 144
AdamGreen 0:3b00827bb0b7 145 /**
AdamGreen 0:3b00827bb0b7 146 * Thread-safe variant of lwip_gethostbyname: instead of using a static
AdamGreen 0:3b00827bb0b7 147 * buffer, this function takes buffer and errno pointers as arguments
AdamGreen 0:3b00827bb0b7 148 * and uses these for the result.
AdamGreen 0:3b00827bb0b7 149 *
AdamGreen 0:3b00827bb0b7 150 * @param name the hostname to resolve
AdamGreen 0:3b00827bb0b7 151 * @param ret pre-allocated struct where to store the result
AdamGreen 0:3b00827bb0b7 152 * @param buf pre-allocated buffer where to store additional data
AdamGreen 0:3b00827bb0b7 153 * @param buflen the size of buf
AdamGreen 0:3b00827bb0b7 154 * @param result pointer to a hostent pointer that is set to ret on success
AdamGreen 0:3b00827bb0b7 155 * and set to zero on error
AdamGreen 0:3b00827bb0b7 156 * @param h_errnop pointer to an int where to store errors (instead of modifying
AdamGreen 0:3b00827bb0b7 157 * the global h_errno)
AdamGreen 0:3b00827bb0b7 158 * @return 0 on success, non-zero on error, additional error information
AdamGreen 0:3b00827bb0b7 159 * is stored in *h_errnop instead of h_errno to be thread-safe
AdamGreen 0:3b00827bb0b7 160 */
AdamGreen 0:3b00827bb0b7 161 int
AdamGreen 0:3b00827bb0b7 162 lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
AdamGreen 0:3b00827bb0b7 163 size_t buflen, struct hostent **result, int *h_errnop)
AdamGreen 0:3b00827bb0b7 164 {
AdamGreen 0:3b00827bb0b7 165 err_t err;
AdamGreen 0:3b00827bb0b7 166 struct gethostbyname_r_helper *h;
AdamGreen 0:3b00827bb0b7 167 char *hostname;
AdamGreen 0:3b00827bb0b7 168 size_t namelen;
AdamGreen 0:3b00827bb0b7 169 int lh_errno;
AdamGreen 0:3b00827bb0b7 170
AdamGreen 0:3b00827bb0b7 171 if (h_errnop == NULL) {
AdamGreen 0:3b00827bb0b7 172 /* ensure h_errnop is never NULL */
AdamGreen 0:3b00827bb0b7 173 h_errnop = &lh_errno;
AdamGreen 0:3b00827bb0b7 174 }
AdamGreen 0:3b00827bb0b7 175
AdamGreen 0:3b00827bb0b7 176 if (result == NULL) {
AdamGreen 0:3b00827bb0b7 177 /* not all arguments given */
AdamGreen 0:3b00827bb0b7 178 *h_errnop = EINVAL;
AdamGreen 0:3b00827bb0b7 179 return -1;
AdamGreen 0:3b00827bb0b7 180 }
AdamGreen 0:3b00827bb0b7 181 /* first thing to do: set *result to nothing */
AdamGreen 0:3b00827bb0b7 182 *result = NULL;
AdamGreen 0:3b00827bb0b7 183 if ((name == NULL) || (ret == NULL) || (buf == 0)) {
AdamGreen 0:3b00827bb0b7 184 /* not all arguments given */
AdamGreen 0:3b00827bb0b7 185 *h_errnop = EINVAL;
AdamGreen 0:3b00827bb0b7 186 return -1;
AdamGreen 0:3b00827bb0b7 187 }
AdamGreen 0:3b00827bb0b7 188
AdamGreen 0:3b00827bb0b7 189 namelen = strlen(name);
AdamGreen 0:3b00827bb0b7 190 if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
AdamGreen 0:3b00827bb0b7 191 /* buf can't hold the data needed + a copy of name */
AdamGreen 0:3b00827bb0b7 192 *h_errnop = ERANGE;
AdamGreen 0:3b00827bb0b7 193 return -1;
AdamGreen 0:3b00827bb0b7 194 }
AdamGreen 0:3b00827bb0b7 195
AdamGreen 0:3b00827bb0b7 196 h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
AdamGreen 0:3b00827bb0b7 197 hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
AdamGreen 0:3b00827bb0b7 198
AdamGreen 0:3b00827bb0b7 199 /* query host IP address */
AdamGreen 0:3b00827bb0b7 200 err = netconn_gethostbyname(name, &(h->addr));
AdamGreen 0:3b00827bb0b7 201 if (err != ERR_OK) {
AdamGreen 0:3b00827bb0b7 202 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
AdamGreen 0:3b00827bb0b7 203 *h_errnop = ENSRNOTFOUND;
AdamGreen 0:3b00827bb0b7 204 return -1;
AdamGreen 0:3b00827bb0b7 205 }
AdamGreen 0:3b00827bb0b7 206
AdamGreen 0:3b00827bb0b7 207 /* copy the hostname into buf */
AdamGreen 0:3b00827bb0b7 208 MEMCPY(hostname, name, namelen);
AdamGreen 0:3b00827bb0b7 209 hostname[namelen] = 0;
AdamGreen 0:3b00827bb0b7 210
AdamGreen 0:3b00827bb0b7 211 /* fill hostent */
AdamGreen 0:3b00827bb0b7 212 h->addrs = &(h->addr);
AdamGreen 0:3b00827bb0b7 213 h->aliases = NULL;
AdamGreen 0:3b00827bb0b7 214 ret->h_name = (char*)hostname;
AdamGreen 0:3b00827bb0b7 215 ret->h_aliases = &(h->aliases);
AdamGreen 0:3b00827bb0b7 216 ret->h_addrtype = AF_INET;
AdamGreen 0:3b00827bb0b7 217 ret->h_length = sizeof(ip_addr_t);
AdamGreen 0:3b00827bb0b7 218 ret->h_addr_list = (char**)&(h->addrs);
AdamGreen 0:3b00827bb0b7 219
AdamGreen 0:3b00827bb0b7 220 /* set result != NULL */
AdamGreen 0:3b00827bb0b7 221 *result = ret;
AdamGreen 0:3b00827bb0b7 222
AdamGreen 0:3b00827bb0b7 223 /* return success */
AdamGreen 0:3b00827bb0b7 224 return 0;
AdamGreen 0:3b00827bb0b7 225 }
AdamGreen 0:3b00827bb0b7 226
AdamGreen 0:3b00827bb0b7 227 /**
AdamGreen 0:3b00827bb0b7 228 * Frees one or more addrinfo structures returned by getaddrinfo(), along with
AdamGreen 0:3b00827bb0b7 229 * any additional storage associated with those structures. If the ai_next field
AdamGreen 0:3b00827bb0b7 230 * of the structure is not null, the entire list of structures is freed.
AdamGreen 0:3b00827bb0b7 231 *
AdamGreen 0:3b00827bb0b7 232 * @param ai struct addrinfo to free
AdamGreen 0:3b00827bb0b7 233 */
AdamGreen 0:3b00827bb0b7 234 void
AdamGreen 0:3b00827bb0b7 235 lwip_freeaddrinfo(struct addrinfo *ai)
AdamGreen 0:3b00827bb0b7 236 {
AdamGreen 0:3b00827bb0b7 237 struct addrinfo *next;
AdamGreen 0:3b00827bb0b7 238
AdamGreen 0:3b00827bb0b7 239 while (ai != NULL) {
AdamGreen 0:3b00827bb0b7 240 next = ai->ai_next;
AdamGreen 0:3b00827bb0b7 241 memp_free(MEMP_NETDB, ai);
AdamGreen 0:3b00827bb0b7 242 ai = next;
AdamGreen 0:3b00827bb0b7 243 }
AdamGreen 0:3b00827bb0b7 244 }
AdamGreen 0:3b00827bb0b7 245
AdamGreen 0:3b00827bb0b7 246 /**
AdamGreen 0:3b00827bb0b7 247 * Translates the name of a service location (for example, a host name) and/or
AdamGreen 0:3b00827bb0b7 248 * a service name and returns a set of socket addresses and associated
AdamGreen 0:3b00827bb0b7 249 * information to be used in creating a socket with which to address the
AdamGreen 0:3b00827bb0b7 250 * specified service.
AdamGreen 0:3b00827bb0b7 251 * Memory for the result is allocated internally and must be freed by calling
AdamGreen 0:3b00827bb0b7 252 * lwip_freeaddrinfo()!
AdamGreen 0:3b00827bb0b7 253 *
AdamGreen 0:3b00827bb0b7 254 * Due to a limitation in dns_gethostbyname, only the first address of a
AdamGreen 0:3b00827bb0b7 255 * host is returned.
AdamGreen 0:3b00827bb0b7 256 * Also, service names are not supported (only port numbers)!
AdamGreen 0:3b00827bb0b7 257 *
AdamGreen 0:3b00827bb0b7 258 * @param nodename descriptive name or address string of the host
AdamGreen 0:3b00827bb0b7 259 * (may be NULL -> local address)
AdamGreen 0:3b00827bb0b7 260 * @param servname port number as string of NULL
AdamGreen 0:3b00827bb0b7 261 * @param hints structure containing input values that set socktype and protocol
AdamGreen 0:3b00827bb0b7 262 * @param res pointer to a pointer where to store the result (set to NULL on failure)
AdamGreen 0:3b00827bb0b7 263 * @return 0 on success, non-zero on failure
AdamGreen 0:3b00827bb0b7 264 */
AdamGreen 0:3b00827bb0b7 265 int
AdamGreen 0:3b00827bb0b7 266 lwip_getaddrinfo(const char *nodename, const char *servname,
AdamGreen 0:3b00827bb0b7 267 const struct addrinfo *hints, struct addrinfo **res)
AdamGreen 0:3b00827bb0b7 268 {
AdamGreen 0:3b00827bb0b7 269 err_t err;
AdamGreen 0:3b00827bb0b7 270 ip_addr_t addr;
AdamGreen 0:3b00827bb0b7 271 struct addrinfo *ai;
AdamGreen 0:3b00827bb0b7 272 struct sockaddr_in *sa = NULL;
AdamGreen 0:3b00827bb0b7 273 int port_nr = 0;
AdamGreen 0:3b00827bb0b7 274 size_t total_size;
AdamGreen 0:3b00827bb0b7 275 size_t namelen = 0;
AdamGreen 0:3b00827bb0b7 276
AdamGreen 0:3b00827bb0b7 277 if (res == NULL) {
AdamGreen 0:3b00827bb0b7 278 return EAI_FAIL;
AdamGreen 0:3b00827bb0b7 279 }
AdamGreen 0:3b00827bb0b7 280 *res = NULL;
AdamGreen 0:3b00827bb0b7 281 if ((nodename == NULL) && (servname == NULL)) {
AdamGreen 0:3b00827bb0b7 282 return EAI_NONAME;
AdamGreen 0:3b00827bb0b7 283 }
AdamGreen 0:3b00827bb0b7 284
AdamGreen 0:3b00827bb0b7 285 if (servname != NULL) {
AdamGreen 0:3b00827bb0b7 286 /* service name specified: convert to port number
AdamGreen 0:3b00827bb0b7 287 * @todo?: currently, only ASCII integers (port numbers) are supported! */
AdamGreen 0:3b00827bb0b7 288 port_nr = atoi(servname);
AdamGreen 0:3b00827bb0b7 289 if ((port_nr <= 0) || (port_nr > 0xffff)) {
AdamGreen 0:3b00827bb0b7 290 return EAI_SERVICE;
AdamGreen 0:3b00827bb0b7 291 }
AdamGreen 0:3b00827bb0b7 292 }
AdamGreen 0:3b00827bb0b7 293
AdamGreen 0:3b00827bb0b7 294 if (nodename != NULL) {
AdamGreen 0:3b00827bb0b7 295 /* service location specified, try to resolve */
AdamGreen 0:3b00827bb0b7 296 err = netconn_gethostbyname(nodename, &addr);
AdamGreen 0:3b00827bb0b7 297 if (err != ERR_OK) {
AdamGreen 0:3b00827bb0b7 298 return EAI_FAIL;
AdamGreen 0:3b00827bb0b7 299 }
AdamGreen 0:3b00827bb0b7 300 } else {
AdamGreen 0:3b00827bb0b7 301 /* service location specified, use loopback address */
AdamGreen 0:3b00827bb0b7 302 ip_addr_set_loopback(&addr);
AdamGreen 0:3b00827bb0b7 303 }
AdamGreen 0:3b00827bb0b7 304
AdamGreen 0:3b00827bb0b7 305 total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
AdamGreen 0:3b00827bb0b7 306 if (nodename != NULL) {
AdamGreen 0:3b00827bb0b7 307 namelen = strlen(nodename);
AdamGreen 0:3b00827bb0b7 308 LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
AdamGreen 0:3b00827bb0b7 309 total_size += namelen + 1;
AdamGreen 0:3b00827bb0b7 310 }
AdamGreen 0:3b00827bb0b7 311 /* If this fails, please report to lwip-devel! :-) */
AdamGreen 0:3b00827bb0b7 312 LWIP_ASSERT("total_size <= NETDB_ELEM_SIZE: please report this!",
AdamGreen 0:3b00827bb0b7 313 total_size <= NETDB_ELEM_SIZE);
AdamGreen 0:3b00827bb0b7 314 ai = (struct addrinfo *)memp_malloc(MEMP_NETDB);
AdamGreen 0:3b00827bb0b7 315 if (ai == NULL) {
AdamGreen 0:3b00827bb0b7 316 goto memerr;
AdamGreen 0:3b00827bb0b7 317 }
AdamGreen 0:3b00827bb0b7 318 memset(ai, 0, total_size);
AdamGreen 0:3b00827bb0b7 319 sa = (struct sockaddr_in*)((u8_t*)ai + sizeof(struct addrinfo));
AdamGreen 0:3b00827bb0b7 320 /* set up sockaddr */
AdamGreen 0:3b00827bb0b7 321 inet_addr_from_ipaddr(&sa->sin_addr, &addr);
AdamGreen 0:3b00827bb0b7 322 sa->sin_family = AF_INET;
AdamGreen 0:3b00827bb0b7 323 sa->sin_len = sizeof(struct sockaddr_in);
AdamGreen 0:3b00827bb0b7 324 sa->sin_port = htons((u16_t)port_nr);
AdamGreen 0:3b00827bb0b7 325
AdamGreen 0:3b00827bb0b7 326 /* set up addrinfo */
AdamGreen 0:3b00827bb0b7 327 ai->ai_family = AF_INET;
AdamGreen 0:3b00827bb0b7 328 if (hints != NULL) {
AdamGreen 0:3b00827bb0b7 329 /* copy socktype & protocol from hints if specified */
AdamGreen 0:3b00827bb0b7 330 ai->ai_socktype = hints->ai_socktype;
AdamGreen 0:3b00827bb0b7 331 ai->ai_protocol = hints->ai_protocol;
AdamGreen 0:3b00827bb0b7 332 }
AdamGreen 0:3b00827bb0b7 333 if (nodename != NULL) {
AdamGreen 0:3b00827bb0b7 334 /* copy nodename to canonname if specified */
AdamGreen 0:3b00827bb0b7 335 ai->ai_canonname = ((char*)ai + sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
AdamGreen 0:3b00827bb0b7 336 MEMCPY(ai->ai_canonname, nodename, namelen);
AdamGreen 0:3b00827bb0b7 337 ai->ai_canonname[namelen] = 0;
AdamGreen 0:3b00827bb0b7 338 }
AdamGreen 0:3b00827bb0b7 339 ai->ai_addrlen = sizeof(struct sockaddr_in);
AdamGreen 0:3b00827bb0b7 340 ai->ai_addr = (struct sockaddr*)sa;
AdamGreen 0:3b00827bb0b7 341
AdamGreen 0:3b00827bb0b7 342 *res = ai;
AdamGreen 0:3b00827bb0b7 343
AdamGreen 0:3b00827bb0b7 344 return 0;
AdamGreen 0:3b00827bb0b7 345 memerr:
AdamGreen 0:3b00827bb0b7 346 if (ai != NULL) {
AdamGreen 0:3b00827bb0b7 347 memp_free(MEMP_NETDB, ai);
AdamGreen 0:3b00827bb0b7 348 }
AdamGreen 0:3b00827bb0b7 349 return EAI_MEMORY;
AdamGreen 0:3b00827bb0b7 350 }
AdamGreen 0:3b00827bb0b7 351
AdamGreen 0:3b00827bb0b7 352 #endif /* LWIP_DNS && LWIP_SOCKET */