Sam Walsh / F7_Ethernet

Forked from STM32F7 internet for nucleo F746ZG

Dependents:   Nucleo_F746ZG_Ethernet_MQTT_Ultrasound

Fork of F7_Ethernet by Dieter Graef

lwip/api/netdb.c@2:b4727195c450, 2016-10-24 (annotated)

Committer:
EmbeddedSam
Date:
Mon Oct 24 12:59:21 2016 +0000
Revision:
2:b4727195c450
Parent:
0:d26c1b55cfca 
working with 1 ultrasound sensor approx 10hz update rate on mqtt

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 0:d26c1b55cfca 1 /**
DieterGraef 0:d26c1b55cfca 2 * @file
DieterGraef 0:d26c1b55cfca 3 * API functions for name resolving
DieterGraef 0:d26c1b55cfca 4 *
DieterGraef 0:d26c1b55cfca 5 */
DieterGraef 0:d26c1b55cfca 6
DieterGraef 0:d26c1b55cfca 7 /*
DieterGraef 0:d26c1b55cfca 8 * Redistribution and use in source and binary forms, with or without modification,
DieterGraef 0:d26c1b55cfca 9 * are permitted provided that the following conditions are met:
DieterGraef 0:d26c1b55cfca 10 *
DieterGraef 0:d26c1b55cfca 11 * 1. Redistributions of source code must retain the above copyright notice,
DieterGraef 0:d26c1b55cfca 12 * this list of conditions and the following disclaimer.
DieterGraef 0:d26c1b55cfca 13 * 2. Redistributions in binary form must reproduce the above copyright notice,
DieterGraef 0:d26c1b55cfca 14 * this list of conditions and the following disclaimer in the documentation
DieterGraef 0:d26c1b55cfca 15 * and/or other materials provided with the distribution.
DieterGraef 0:d26c1b55cfca 16 * 3. The name of the author may not be used to endorse or promote products
DieterGraef 0:d26c1b55cfca 17 * derived from this software without specific prior written permission.
DieterGraef 0:d26c1b55cfca 18 *
DieterGraef 0:d26c1b55cfca 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
DieterGraef 0:d26c1b55cfca 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
DieterGraef 0:d26c1b55cfca 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
DieterGraef 0:d26c1b55cfca 22 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
DieterGraef 0:d26c1b55cfca 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
DieterGraef 0:d26c1b55cfca 24 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
DieterGraef 0:d26c1b55cfca 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
DieterGraef 0:d26c1b55cfca 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
DieterGraef 0:d26c1b55cfca 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
DieterGraef 0:d26c1b55cfca 28 * OF SUCH DAMAGE.
DieterGraef 0:d26c1b55cfca 29 *
DieterGraef 0:d26c1b55cfca 30 * This file is part of the lwIP TCP/IP stack.
DieterGraef 0:d26c1b55cfca 31 *
DieterGraef 0:d26c1b55cfca 32 * Author: Simon Goldschmidt
DieterGraef 0:d26c1b55cfca 33 *
DieterGraef 0:d26c1b55cfca 34 */
DieterGraef 0:d26c1b55cfca 35
DieterGraef 0:d26c1b55cfca 36 #include "lwip/netdb.h"
DieterGraef 0:d26c1b55cfca 37
DieterGraef 0:d26c1b55cfca 38 #if LWIP_DNS && LWIP_SOCKET
DieterGraef 0:d26c1b55cfca 39
DieterGraef 0:d26c1b55cfca 40 #include "lwip/err.h"
DieterGraef 0:d26c1b55cfca 41 #include "lwip/mem.h"
DieterGraef 0:d26c1b55cfca 42 #include "lwip/memp.h"
DieterGraef 0:d26c1b55cfca 43 #include "lwip/ip_addr.h"
DieterGraef 0:d26c1b55cfca 44 #include "lwip/api.h"
DieterGraef 0:d26c1b55cfca 45 #include "lwip/dns.h"
DieterGraef 0:d26c1b55cfca 46
DieterGraef 0:d26c1b55cfca 47 #include <string.h>
DieterGraef 0:d26c1b55cfca 48 #include <stdlib.h>
DieterGraef 0:d26c1b55cfca 49
DieterGraef 0:d26c1b55cfca 50 /** helper struct for gethostbyname_r to access the char* buffer */
DieterGraef 0:d26c1b55cfca 51 struct gethostbyname_r_helper {
DieterGraef 0:d26c1b55cfca 52 ip_addr_t *addr_list[2];
DieterGraef 0:d26c1b55cfca 53 ip_addr_t addr;
DieterGraef 0:d26c1b55cfca 54 char *aliases;
DieterGraef 0:d26c1b55cfca 55 };
DieterGraef 0:d26c1b55cfca 56
DieterGraef 0:d26c1b55cfca 57 /** h_errno is exported in netdb.h for access by applications. */
DieterGraef 0:d26c1b55cfca 58 #if LWIP_DNS_API_DECLARE_H_ERRNO
DieterGraef 0:d26c1b55cfca 59 int h_errno;
DieterGraef 0:d26c1b55cfca 60 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
DieterGraef 0:d26c1b55cfca 61
DieterGraef 0:d26c1b55cfca 62 /** define "hostent" variables storage: 0 if we use a static (but unprotected)
DieterGraef 0:d26c1b55cfca 63 * set of variables for lwip_gethostbyname, 1 if we use a local storage */
DieterGraef 0:d26c1b55cfca 64 #ifndef LWIP_DNS_API_HOSTENT_STORAGE
DieterGraef 0:d26c1b55cfca 65 #define LWIP_DNS_API_HOSTENT_STORAGE 0
DieterGraef 0:d26c1b55cfca 66 #endif
DieterGraef 0:d26c1b55cfca 67
DieterGraef 0:d26c1b55cfca 68 /** define "hostent" variables storage */
DieterGraef 0:d26c1b55cfca 69 #if LWIP_DNS_API_HOSTENT_STORAGE
DieterGraef 0:d26c1b55cfca 70 #define HOSTENT_STORAGE
DieterGraef 0:d26c1b55cfca 71 #else
DieterGraef 0:d26c1b55cfca 72 #define HOSTENT_STORAGE static
DieterGraef 0:d26c1b55cfca 73 #endif /* LWIP_DNS_API_STATIC_HOSTENT */
DieterGraef 0:d26c1b55cfca 74
DieterGraef 0:d26c1b55cfca 75 /**
DieterGraef 0:d26c1b55cfca 76 * Returns an entry containing addresses of address family AF_INET
DieterGraef 0:d26c1b55cfca 77 * for the host with name name.
DieterGraef 0:d26c1b55cfca 78 * Due to dns_gethostbyname limitations, only one address is returned.
DieterGraef 0:d26c1b55cfca 79 *
DieterGraef 0:d26c1b55cfca 80 * @param name the hostname to resolve
DieterGraef 0:d26c1b55cfca 81 * @return an entry containing addresses of address family AF_INET
DieterGraef 0:d26c1b55cfca 82 * for the host with name name
DieterGraef 0:d26c1b55cfca 83 */
DieterGraef 0:d26c1b55cfca 84 struct hostent*
DieterGraef 0:d26c1b55cfca 85 lwip_gethostbyname(const char *name)
DieterGraef 0:d26c1b55cfca 86 {
DieterGraef 0:d26c1b55cfca 87 err_t err;
DieterGraef 0:d26c1b55cfca 88 ip_addr_t addr;
DieterGraef 0:d26c1b55cfca 89
DieterGraef 0:d26c1b55cfca 90 /* buffer variables for lwip_gethostbyname() */
DieterGraef 0:d26c1b55cfca 91 HOSTENT_STORAGE struct hostent s_hostent;
DieterGraef 0:d26c1b55cfca 92 HOSTENT_STORAGE char *s_aliases;
DieterGraef 0:d26c1b55cfca 93 HOSTENT_STORAGE ip_addr_t s_hostent_addr;
DieterGraef 0:d26c1b55cfca 94 HOSTENT_STORAGE ip_addr_t *s_phostent_addr[2];
DieterGraef 0:d26c1b55cfca 95
DieterGraef 0:d26c1b55cfca 96 /* query host IP address */
DieterGraef 0:d26c1b55cfca 97 err = netconn_gethostbyname(name, &addr);
DieterGraef 0:d26c1b55cfca 98 if (err != ERR_OK) {
DieterGraef 0:d26c1b55cfca 99 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
DieterGraef 0:d26c1b55cfca 100 h_errno = HOST_NOT_FOUND;
DieterGraef 0:d26c1b55cfca 101 return NULL;
DieterGraef 0:d26c1b55cfca 102 }
DieterGraef 0:d26c1b55cfca 103
DieterGraef 0:d26c1b55cfca 104 /* fill hostent */
DieterGraef 0:d26c1b55cfca 105 s_hostent_addr = addr;
DieterGraef 0:d26c1b55cfca 106 s_phostent_addr[0] = &s_hostent_addr;
DieterGraef 0:d26c1b55cfca 107 s_phostent_addr[1] = NULL;
DieterGraef 0:d26c1b55cfca 108 s_hostent.h_name = (char*)name;
DieterGraef 0:d26c1b55cfca 109 s_hostent.h_aliases = &s_aliases;
DieterGraef 0:d26c1b55cfca 110 s_hostent.h_addrtype = AF_INET;
DieterGraef 0:d26c1b55cfca 111 s_hostent.h_length = sizeof(ip_addr_t);
DieterGraef 0:d26c1b55cfca 112 s_hostent.h_addr_list = (char**)&s_phostent_addr;
DieterGraef 0:d26c1b55cfca 113
DieterGraef 0:d26c1b55cfca 114 #if DNS_DEBUG
DieterGraef 0:d26c1b55cfca 115 /* dump hostent */
DieterGraef 0:d26c1b55cfca 116 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
DieterGraef 0:d26c1b55cfca 117 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
DieterGraef 0:d26c1b55cfca 118 if (s_hostent.h_aliases != NULL) {
DieterGraef 0:d26c1b55cfca 119 u8_t idx;
DieterGraef 0:d26c1b55cfca 120 for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
DieterGraef 0:d26c1b55cfca 121 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
DieterGraef 0:d26c1b55cfca 122 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
DieterGraef 0:d26c1b55cfca 123 }
DieterGraef 0:d26c1b55cfca 124 }
DieterGraef 0:d26c1b55cfca 125 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
DieterGraef 0:d26c1b55cfca 126 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
DieterGraef 0:d26c1b55cfca 127 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
DieterGraef 0:d26c1b55cfca 128 if (s_hostent.h_addr_list != NULL) {
DieterGraef 0:d26c1b55cfca 129 u8_t idx;
DieterGraef 0:d26c1b55cfca 130 for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
DieterGraef 0:d26c1b55cfca 131 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
DieterGraef 0:d26c1b55cfca 132 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i]-> == %s\n", idx, ip_ntoa((ip_addr_t*)s_hostent.h_addr_list[idx])));
DieterGraef 0:d26c1b55cfca 133 }
DieterGraef 0:d26c1b55cfca 134 }
DieterGraef 0:d26c1b55cfca 135 #endif /* DNS_DEBUG */
DieterGraef 0:d26c1b55cfca 136
DieterGraef 0:d26c1b55cfca 137 #if LWIP_DNS_API_HOSTENT_STORAGE
DieterGraef 0:d26c1b55cfca 138 /* this function should return the "per-thread" hostent after copy from s_hostent */
DieterGraef 0:d26c1b55cfca 139 return sys_thread_hostent(&s_hostent);
DieterGraef 0:d26c1b55cfca 140 #else
DieterGraef 0:d26c1b55cfca 141 return &s_hostent;
DieterGraef 0:d26c1b55cfca 142 #endif /* LWIP_DNS_API_HOSTENT_STORAGE */
DieterGraef 0:d26c1b55cfca 143 }
DieterGraef 0:d26c1b55cfca 144
DieterGraef 0:d26c1b55cfca 145 /**
DieterGraef 0:d26c1b55cfca 146 * Thread-safe variant of lwip_gethostbyname: instead of using a static
DieterGraef 0:d26c1b55cfca 147 * buffer, this function takes buffer and errno pointers as arguments
DieterGraef 0:d26c1b55cfca 148 * and uses these for the result.
DieterGraef 0:d26c1b55cfca 149 *
DieterGraef 0:d26c1b55cfca 150 * @param name the hostname to resolve
DieterGraef 0:d26c1b55cfca 151 * @param ret pre-allocated struct where to store the result
DieterGraef 0:d26c1b55cfca 152 * @param buf pre-allocated buffer where to store additional data
DieterGraef 0:d26c1b55cfca 153 * @param buflen the size of buf
DieterGraef 0:d26c1b55cfca 154 * @param result pointer to a hostent pointer that is set to ret on success
DieterGraef 0:d26c1b55cfca 155 * and set to zero on error
DieterGraef 0:d26c1b55cfca 156 * @param h_errnop pointer to an int where to store errors (instead of modifying
DieterGraef 0:d26c1b55cfca 157 * the global h_errno)
DieterGraef 0:d26c1b55cfca 158 * @return 0 on success, non-zero on error, additional error information
DieterGraef 0:d26c1b55cfca 159 * is stored in *h_errnop instead of h_errno to be thread-safe
DieterGraef 0:d26c1b55cfca 160 */
DieterGraef 0:d26c1b55cfca 161 int
DieterGraef 0:d26c1b55cfca 162 lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
DieterGraef 0:d26c1b55cfca 163 size_t buflen, struct hostent **result, int *h_errnop)
DieterGraef 0:d26c1b55cfca 164 {
DieterGraef 0:d26c1b55cfca 165 err_t err;
DieterGraef 0:d26c1b55cfca 166 struct gethostbyname_r_helper *h;
DieterGraef 0:d26c1b55cfca 167 char *hostname;
DieterGraef 0:d26c1b55cfca 168 size_t namelen;
DieterGraef 0:d26c1b55cfca 169 int lh_errno;
DieterGraef 0:d26c1b55cfca 170
DieterGraef 0:d26c1b55cfca 171 if (h_errnop == NULL) {
DieterGraef 0:d26c1b55cfca 172 /* ensure h_errnop is never NULL */
DieterGraef 0:d26c1b55cfca 173 h_errnop = &lh_errno;
DieterGraef 0:d26c1b55cfca 174 }
DieterGraef 0:d26c1b55cfca 175
DieterGraef 0:d26c1b55cfca 176 if (result == NULL) {
DieterGraef 0:d26c1b55cfca 177 /* not all arguments given */
DieterGraef 0:d26c1b55cfca 178 *h_errnop = EINVAL;
DieterGraef 0:d26c1b55cfca 179 return -1;
DieterGraef 0:d26c1b55cfca 180 }
DieterGraef 0:d26c1b55cfca 181 /* first thing to do: set *result to nothing */
DieterGraef 0:d26c1b55cfca 182 *result = NULL;
DieterGraef 0:d26c1b55cfca 183 if ((name == NULL) || (ret == NULL) || (buf == NULL)) {
DieterGraef 0:d26c1b55cfca 184 /* not all arguments given */
DieterGraef 0:d26c1b55cfca 185 *h_errnop = EINVAL;
DieterGraef 0:d26c1b55cfca 186 return -1;
DieterGraef 0:d26c1b55cfca 187 }
DieterGraef 0:d26c1b55cfca 188
DieterGraef 0:d26c1b55cfca 189 namelen = strlen(name);
DieterGraef 0:d26c1b55cfca 190 if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
DieterGraef 0:d26c1b55cfca 191 /* buf can't hold the data needed + a copy of name */
DieterGraef 0:d26c1b55cfca 192 *h_errnop = ERANGE;
DieterGraef 0:d26c1b55cfca 193 return -1;
DieterGraef 0:d26c1b55cfca 194 }
DieterGraef 0:d26c1b55cfca 195
DieterGraef 0:d26c1b55cfca 196 h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
DieterGraef 0:d26c1b55cfca 197 hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
DieterGraef 0:d26c1b55cfca 198
DieterGraef 0:d26c1b55cfca 199 /* query host IP address */
DieterGraef 0:d26c1b55cfca 200 err = netconn_gethostbyname(name, &h->addr);
DieterGraef 0:d26c1b55cfca 201 if (err != ERR_OK) {
DieterGraef 0:d26c1b55cfca 202 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
DieterGraef 0:d26c1b55cfca 203 *h_errnop = HOST_NOT_FOUND;
DieterGraef 0:d26c1b55cfca 204 return -1;
DieterGraef 0:d26c1b55cfca 205 }
DieterGraef 0:d26c1b55cfca 206
DieterGraef 0:d26c1b55cfca 207 /* copy the hostname into buf */
DieterGraef 0:d26c1b55cfca 208 MEMCPY(hostname, name, namelen);
DieterGraef 0:d26c1b55cfca 209 hostname[namelen] = 0;
DieterGraef 0:d26c1b55cfca 210
DieterGraef 0:d26c1b55cfca 211 /* fill hostent */
DieterGraef 0:d26c1b55cfca 212 h->addr_list[0] = &h->addr;
DieterGraef 0:d26c1b55cfca 213 h->addr_list[1] = NULL;
DieterGraef 0:d26c1b55cfca 214 h->aliases = NULL;
DieterGraef 0:d26c1b55cfca 215 ret->h_name = hostname;
DieterGraef 0:d26c1b55cfca 216 ret->h_aliases = &h->aliases;
DieterGraef 0:d26c1b55cfca 217 ret->h_addrtype = AF_INET;
DieterGraef 0:d26c1b55cfca 218 ret->h_length = sizeof(ip_addr_t);
DieterGraef 0:d26c1b55cfca 219 ret->h_addr_list = (char**)&h->addr_list;
DieterGraef 0:d26c1b55cfca 220
DieterGraef 0:d26c1b55cfca 221 /* set result != NULL */
DieterGraef 0:d26c1b55cfca 222 *result = ret;
DieterGraef 0:d26c1b55cfca 223
DieterGraef 0:d26c1b55cfca 224 /* return success */
DieterGraef 0:d26c1b55cfca 225 return 0;
DieterGraef 0:d26c1b55cfca 226 }
DieterGraef 0:d26c1b55cfca 227
DieterGraef 0:d26c1b55cfca 228 /**
DieterGraef 0:d26c1b55cfca 229 * Frees one or more addrinfo structures returned by getaddrinfo(), along with
DieterGraef 0:d26c1b55cfca 230 * any additional storage associated with those structures. If the ai_next field
DieterGraef 0:d26c1b55cfca 231 * of the structure is not null, the entire list of structures is freed.
DieterGraef 0:d26c1b55cfca 232 *
DieterGraef 0:d26c1b55cfca 233 * @param ai struct addrinfo to free
DieterGraef 0:d26c1b55cfca 234 */
DieterGraef 0:d26c1b55cfca 235 void
DieterGraef 0:d26c1b55cfca 236 lwip_freeaddrinfo(struct addrinfo *ai)
DieterGraef 0:d26c1b55cfca 237 {
DieterGraef 0:d26c1b55cfca 238 struct addrinfo *next;
DieterGraef 0:d26c1b55cfca 239
DieterGraef 0:d26c1b55cfca 240 while (ai != NULL) {
DieterGraef 0:d26c1b55cfca 241 next = ai->ai_next;
DieterGraef 0:d26c1b55cfca 242 memp_free(MEMP_NETDB, ai);
DieterGraef 0:d26c1b55cfca 243 ai = next;
DieterGraef 0:d26c1b55cfca 244 }
DieterGraef 0:d26c1b55cfca 245 }
DieterGraef 0:d26c1b55cfca 246
DieterGraef 0:d26c1b55cfca 247 /**
DieterGraef 0:d26c1b55cfca 248 * Translates the name of a service location (for example, a host name) and/or
DieterGraef 0:d26c1b55cfca 249 * a service name and returns a set of socket addresses and associated
DieterGraef 0:d26c1b55cfca 250 * information to be used in creating a socket with which to address the
DieterGraef 0:d26c1b55cfca 251 * specified service.
DieterGraef 0:d26c1b55cfca 252 * Memory for the result is allocated internally and must be freed by calling
DieterGraef 0:d26c1b55cfca 253 * lwip_freeaddrinfo()!
DieterGraef 0:d26c1b55cfca 254 *
DieterGraef 0:d26c1b55cfca 255 * Due to a limitation in dns_gethostbyname, only the first address of a
DieterGraef 0:d26c1b55cfca 256 * host is returned.
DieterGraef 0:d26c1b55cfca 257 * Also, service names are not supported (only port numbers)!
DieterGraef 0:d26c1b55cfca 258 *
DieterGraef 0:d26c1b55cfca 259 * @param nodename descriptive name or address string of the host
DieterGraef 0:d26c1b55cfca 260 * (may be NULL -> local address)
DieterGraef 0:d26c1b55cfca 261 * @param servname port number as string of NULL
DieterGraef 0:d26c1b55cfca 262 * @param hints structure containing input values that set socktype and protocol
DieterGraef 0:d26c1b55cfca 263 * @param res pointer to a pointer where to store the result (set to NULL on failure)
DieterGraef 0:d26c1b55cfca 264 * @return 0 on success, non-zero on failure
DieterGraef 0:d26c1b55cfca 265 */
DieterGraef 0:d26c1b55cfca 266 int
DieterGraef 0:d26c1b55cfca 267 lwip_getaddrinfo(const char *nodename, const char *servname,
DieterGraef 0:d26c1b55cfca 268 const struct addrinfo *hints, struct addrinfo **res)
DieterGraef 0:d26c1b55cfca 269 {
DieterGraef 0:d26c1b55cfca 270 err_t err;
DieterGraef 0:d26c1b55cfca 271 ip_addr_t addr;
DieterGraef 0:d26c1b55cfca 272 struct addrinfo *ai;
DieterGraef 0:d26c1b55cfca 273 struct sockaddr_in *sa = NULL;
DieterGraef 0:d26c1b55cfca 274 int port_nr = 0;
DieterGraef 0:d26c1b55cfca 275 size_t total_size;
DieterGraef 0:d26c1b55cfca 276 size_t namelen = 0;
DieterGraef 0:d26c1b55cfca 277
DieterGraef 0:d26c1b55cfca 278 if (res == NULL) {
DieterGraef 0:d26c1b55cfca 279 return EAI_FAIL;
DieterGraef 0:d26c1b55cfca 280 }
DieterGraef 0:d26c1b55cfca 281 *res = NULL;
DieterGraef 0:d26c1b55cfca 282 if ((nodename == NULL) && (servname == NULL)) {
DieterGraef 0:d26c1b55cfca 283 return EAI_NONAME;
DieterGraef 0:d26c1b55cfca 284 }
DieterGraef 0:d26c1b55cfca 285
DieterGraef 0:d26c1b55cfca 286 if (servname != NULL) {
DieterGraef 0:d26c1b55cfca 287 /* service name specified: convert to port number
DieterGraef 0:d26c1b55cfca 288 * @todo?: currently, only ASCII integers (port numbers) are supported! */
DieterGraef 0:d26c1b55cfca 289 port_nr = atoi(servname);
DieterGraef 0:d26c1b55cfca 290 if ((port_nr <= 0) || (port_nr > 0xffff)) {
DieterGraef 0:d26c1b55cfca 291 return EAI_SERVICE;
DieterGraef 0:d26c1b55cfca 292 }
DieterGraef 0:d26c1b55cfca 293 }
DieterGraef 0:d26c1b55cfca 294
DieterGraef 0:d26c1b55cfca 295 if (nodename != NULL) {
DieterGraef 0:d26c1b55cfca 296 /* service location specified, try to resolve */
DieterGraef 0:d26c1b55cfca 297 err = netconn_gethostbyname(nodename, &addr);
DieterGraef 0:d26c1b55cfca 298 if (err != ERR_OK) {
DieterGraef 0:d26c1b55cfca 299 return EAI_FAIL;
DieterGraef 0:d26c1b55cfca 300 }
DieterGraef 0:d26c1b55cfca 301 } else {
DieterGraef 0:d26c1b55cfca 302 /* service location specified, use loopback address */
DieterGraef 0:d26c1b55cfca 303 ip_addr_set_loopback(&addr);
DieterGraef 0:d26c1b55cfca 304 }
DieterGraef 0:d26c1b55cfca 305
DieterGraef 0:d26c1b55cfca 306 total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
DieterGraef 0:d26c1b55cfca 307 if (nodename != NULL) {
DieterGraef 0:d26c1b55cfca 308 namelen = strlen(nodename);
DieterGraef 0:d26c1b55cfca 309 LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
DieterGraef 0:d26c1b55cfca 310 total_size += namelen + 1;
DieterGraef 0:d26c1b55cfca 311 }
DieterGraef 0:d26c1b55cfca 312 /* If this fails, please report to lwip-devel! :-) */
DieterGraef 0:d26c1b55cfca 313 LWIP_ASSERT("total_size <= NETDB_ELEM_SIZE: please report this!",
DieterGraef 0:d26c1b55cfca 314 total_size <= NETDB_ELEM_SIZE);
DieterGraef 0:d26c1b55cfca 315 ai = (struct addrinfo *)memp_malloc(MEMP_NETDB);
DieterGraef 0:d26c1b55cfca 316 if (ai == NULL) {
DieterGraef 0:d26c1b55cfca 317 goto memerr;
DieterGraef 0:d26c1b55cfca 318 }
DieterGraef 0:d26c1b55cfca 319 memset(ai, 0, total_size);
DieterGraef 0:d26c1b55cfca 320 sa = (struct sockaddr_in*)((u8_t*)ai + sizeof(struct addrinfo));
DieterGraef 0:d26c1b55cfca 321 /* set up sockaddr */
DieterGraef 0:d26c1b55cfca 322 inet_addr_from_ipaddr(&sa->sin_addr, &addr);
DieterGraef 0:d26c1b55cfca 323 sa->sin_family = AF_INET;
DieterGraef 0:d26c1b55cfca 324 sa->sin_len = sizeof(struct sockaddr_in);
DieterGraef 0:d26c1b55cfca 325 sa->sin_port = htons((u16_t)port_nr);
DieterGraef 0:d26c1b55cfca 326
DieterGraef 0:d26c1b55cfca 327 /* set up addrinfo */
DieterGraef 0:d26c1b55cfca 328 ai->ai_family = AF_INET;
DieterGraef 0:d26c1b55cfca 329 if (hints != NULL) {
DieterGraef 0:d26c1b55cfca 330 /* copy socktype & protocol from hints if specified */
DieterGraef 0:d26c1b55cfca 331 ai->ai_socktype = hints->ai_socktype;
DieterGraef 0:d26c1b55cfca 332 ai->ai_protocol = hints->ai_protocol;
DieterGraef 0:d26c1b55cfca 333 }
DieterGraef 0:d26c1b55cfca 334 if (nodename != NULL) {
DieterGraef 0:d26c1b55cfca 335 /* copy nodename to canonname if specified */
DieterGraef 0:d26c1b55cfca 336 ai->ai_canonname = ((char*)ai + sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
DieterGraef 0:d26c1b55cfca 337 MEMCPY(ai->ai_canonname, nodename, namelen);
DieterGraef 0:d26c1b55cfca 338 ai->ai_canonname[namelen] = 0;
DieterGraef 0:d26c1b55cfca 339 }
DieterGraef 0:d26c1b55cfca 340 ai->ai_addrlen = sizeof(struct sockaddr_in);
DieterGraef 0:d26c1b55cfca 341 ai->ai_addr = (struct sockaddr*)sa;
DieterGraef 0:d26c1b55cfca 342
DieterGraef 0:d26c1b55cfca 343 *res = ai;
DieterGraef 0:d26c1b55cfca 344
DieterGraef 0:d26c1b55cfca 345 return 0;
DieterGraef 0:d26c1b55cfca 346 memerr:
DieterGraef 0:d26c1b55cfca 347 if (ai != NULL) {
DieterGraef 0:d26c1b55cfca 348 memp_free(MEMP_NETDB, ai);
DieterGraef 0:d26c1b55cfca 349 }
DieterGraef 0:d26c1b55cfca 350 return EAI_MEMORY;
DieterGraef 0:d26c1b55cfca 351 }
DieterGraef 0:d26c1b55cfca 352
DieterGraef 0:d26c1b55cfca 353 #endif /* LWIP_DNS && LWIP_SOCKET */