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Dependencies:   BufferedSerial FatFileSystemCpp mbed

EthernetInterface/lwip/api/netdb.c@22:0dd9c1b5664a, 2021-07-05 (annotated)

Committer:
AndyA
Date:
Mon Jul 05 15:30:14 2021 +0000
Revision:
22:0dd9c1b5664a
First pass at adding UDP FreeD output

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AndyA 22:0dd9c1b5664a 1 /**
AndyA 22:0dd9c1b5664a 2 * @file
AndyA 22:0dd9c1b5664a 3 * API functions for name resolving
AndyA 22:0dd9c1b5664a 4 *
AndyA 22:0dd9c1b5664a 5 */
AndyA 22:0dd9c1b5664a 6
AndyA 22:0dd9c1b5664a 7 /*
AndyA 22:0dd9c1b5664a 8 * Redistribution and use in source and binary forms, with or without modification,
AndyA 22:0dd9c1b5664a 9 * are permitted provided that the following conditions are met:
AndyA 22:0dd9c1b5664a 10 *
AndyA 22:0dd9c1b5664a 11 * 1. Redistributions of source code must retain the above copyright notice,
AndyA 22:0dd9c1b5664a 12 * this list of conditions and the following disclaimer.
AndyA 22:0dd9c1b5664a 13 * 2. Redistributions in binary form must reproduce the above copyright notice,
AndyA 22:0dd9c1b5664a 14 * this list of conditions and the following disclaimer in the documentation
AndyA 22:0dd9c1b5664a 15 * and/or other materials provided with the distribution.
AndyA 22:0dd9c1b5664a 16 * 3. The name of the author may not be used to endorse or promote products
AndyA 22:0dd9c1b5664a 17 * derived from this software without specific prior written permission.
AndyA 22:0dd9c1b5664a 18 *
AndyA 22:0dd9c1b5664a 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AndyA 22:0dd9c1b5664a 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AndyA 22:0dd9c1b5664a 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AndyA 22:0dd9c1b5664a 22 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AndyA 22:0dd9c1b5664a 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AndyA 22:0dd9c1b5664a 24 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AndyA 22:0dd9c1b5664a 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AndyA 22:0dd9c1b5664a 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AndyA 22:0dd9c1b5664a 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AndyA 22:0dd9c1b5664a 28 * OF SUCH DAMAGE.
AndyA 22:0dd9c1b5664a 29 *
AndyA 22:0dd9c1b5664a 30 * This file is part of the lwIP TCP/IP stack.
AndyA 22:0dd9c1b5664a 31 *
AndyA 22:0dd9c1b5664a 32 * Author: Simon Goldschmidt
AndyA 22:0dd9c1b5664a 33 *
AndyA 22:0dd9c1b5664a 34 */
AndyA 22:0dd9c1b5664a 35
AndyA 22:0dd9c1b5664a 36 #include "lwip/netdb.h"
AndyA 22:0dd9c1b5664a 37
AndyA 22:0dd9c1b5664a 38 #if LWIP_DNS && LWIP_SOCKET
AndyA 22:0dd9c1b5664a 39
AndyA 22:0dd9c1b5664a 40 #include "lwip/err.h"
AndyA 22:0dd9c1b5664a 41 #include "lwip/mem.h"
AndyA 22:0dd9c1b5664a 42 #include "lwip/memp.h"
AndyA 22:0dd9c1b5664a 43 #include "lwip/ip_addr.h"
AndyA 22:0dd9c1b5664a 44 #include "lwip/api.h"
AndyA 22:0dd9c1b5664a 45 #include "lwip/dns.h"
AndyA 22:0dd9c1b5664a 46
AndyA 22:0dd9c1b5664a 47 #include <string.h>
AndyA 22:0dd9c1b5664a 48 #include <stdlib.h>
AndyA 22:0dd9c1b5664a 49
AndyA 22:0dd9c1b5664a 50 /** helper struct for gethostbyname_r to access the char* buffer */
AndyA 22:0dd9c1b5664a 51 struct gethostbyname_r_helper {
AndyA 22:0dd9c1b5664a 52 ip_addr_t *addrs;
AndyA 22:0dd9c1b5664a 53 ip_addr_t addr;
AndyA 22:0dd9c1b5664a 54 char *aliases;
AndyA 22:0dd9c1b5664a 55 };
AndyA 22:0dd9c1b5664a 56
AndyA 22:0dd9c1b5664a 57 /** h_errno is exported in netdb.h for access by applications. */
AndyA 22:0dd9c1b5664a 58 #if LWIP_DNS_API_DECLARE_H_ERRNO
AndyA 22:0dd9c1b5664a 59 int h_errno;
AndyA 22:0dd9c1b5664a 60 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
AndyA 22:0dd9c1b5664a 61
AndyA 22:0dd9c1b5664a 62 /** define "hostent" variables storage: 0 if we use a static (but unprotected)
AndyA 22:0dd9c1b5664a 63 * set of variables for lwip_gethostbyname, 1 if we use a local storage */
AndyA 22:0dd9c1b5664a 64 #ifndef LWIP_DNS_API_HOSTENT_STORAGE
AndyA 22:0dd9c1b5664a 65 #define LWIP_DNS_API_HOSTENT_STORAGE 0
AndyA 22:0dd9c1b5664a 66 #endif
AndyA 22:0dd9c1b5664a 67
AndyA 22:0dd9c1b5664a 68 /** define "hostent" variables storage */
AndyA 22:0dd9c1b5664a 69 #if LWIP_DNS_API_HOSTENT_STORAGE
AndyA 22:0dd9c1b5664a 70 #define HOSTENT_STORAGE
AndyA 22:0dd9c1b5664a 71 #else
AndyA 22:0dd9c1b5664a 72 #define HOSTENT_STORAGE static
AndyA 22:0dd9c1b5664a 73 #endif /* LWIP_DNS_API_STATIC_HOSTENT */
AndyA 22:0dd9c1b5664a 74
AndyA 22:0dd9c1b5664a 75 /**
AndyA 22:0dd9c1b5664a 76 * Returns an entry containing addresses of address family AF_INET
AndyA 22:0dd9c1b5664a 77 * for the host with name name.
AndyA 22:0dd9c1b5664a 78 * Due to dns_gethostbyname limitations, only one address is returned.
AndyA 22:0dd9c1b5664a 79 *
AndyA 22:0dd9c1b5664a 80 * @param name the hostname to resolve
AndyA 22:0dd9c1b5664a 81 * @return an entry containing addresses of address family AF_INET
AndyA 22:0dd9c1b5664a 82 * for the host with name name
AndyA 22:0dd9c1b5664a 83 */
AndyA 22:0dd9c1b5664a 84 struct hostent*
AndyA 22:0dd9c1b5664a 85 lwip_gethostbyname(const char *name)
AndyA 22:0dd9c1b5664a 86 {
AndyA 22:0dd9c1b5664a 87 err_t err;
AndyA 22:0dd9c1b5664a 88 ip_addr_t addr;
AndyA 22:0dd9c1b5664a 89
AndyA 22:0dd9c1b5664a 90 /* buffer variables for lwip_gethostbyname() */
AndyA 22:0dd9c1b5664a 91 HOSTENT_STORAGE struct hostent s_hostent;
AndyA 22:0dd9c1b5664a 92 HOSTENT_STORAGE char *s_aliases;
AndyA 22:0dd9c1b5664a 93 HOSTENT_STORAGE ip_addr_t s_hostent_addr;
AndyA 22:0dd9c1b5664a 94 HOSTENT_STORAGE ip_addr_t *s_phostent_addr[2];
AndyA 22:0dd9c1b5664a 95
AndyA 22:0dd9c1b5664a 96 /* query host IP address */
AndyA 22:0dd9c1b5664a 97 err = netconn_gethostbyname(name, &addr);
AndyA 22:0dd9c1b5664a 98 if (err != ERR_OK) {
AndyA 22:0dd9c1b5664a 99 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
AndyA 22:0dd9c1b5664a 100 h_errno = HOST_NOT_FOUND;
AndyA 22:0dd9c1b5664a 101 return NULL;
AndyA 22:0dd9c1b5664a 102 }
AndyA 22:0dd9c1b5664a 103
AndyA 22:0dd9c1b5664a 104 /* fill hostent */
AndyA 22:0dd9c1b5664a 105 s_hostent_addr = addr;
AndyA 22:0dd9c1b5664a 106 s_phostent_addr[0] = &s_hostent_addr;
AndyA 22:0dd9c1b5664a 107 s_phostent_addr[1] = NULL;
AndyA 22:0dd9c1b5664a 108 s_hostent.h_name = (char*)name;
AndyA 22:0dd9c1b5664a 109 s_hostent.h_aliases = &s_aliases;
AndyA 22:0dd9c1b5664a 110 s_hostent.h_addrtype = AF_INET;
AndyA 22:0dd9c1b5664a 111 s_hostent.h_length = sizeof(ip_addr_t);
AndyA 22:0dd9c1b5664a 112 s_hostent.h_addr_list = (char**)&s_phostent_addr;
AndyA 22:0dd9c1b5664a 113
AndyA 22:0dd9c1b5664a 114 #if DNS_DEBUG
AndyA 22:0dd9c1b5664a 115 /* dump hostent */
AndyA 22:0dd9c1b5664a 116 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
AndyA 22:0dd9c1b5664a 117 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
AndyA 22:0dd9c1b5664a 118 if (s_hostent.h_aliases != NULL) {
AndyA 22:0dd9c1b5664a 119 u8_t idx;
AndyA 22:0dd9c1b5664a 120 for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
AndyA 22:0dd9c1b5664a 121 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
AndyA 22:0dd9c1b5664a 122 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
AndyA 22:0dd9c1b5664a 123 }
AndyA 22:0dd9c1b5664a 124 }
AndyA 22:0dd9c1b5664a 125 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
AndyA 22:0dd9c1b5664a 126 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
AndyA 22:0dd9c1b5664a 127 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
AndyA 22:0dd9c1b5664a 128 if (s_hostent.h_addr_list != NULL) {
AndyA 22:0dd9c1b5664a 129 u8_t idx;
AndyA 22:0dd9c1b5664a 130 for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
AndyA 22:0dd9c1b5664a 131 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
AndyA 22:0dd9c1b5664a 132 LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i]-> == %s\n", idx, ip_ntoa((ip_addr_t*)s_hostent.h_addr_list[idx])));
AndyA 22:0dd9c1b5664a 133 }
AndyA 22:0dd9c1b5664a 134 }
AndyA 22:0dd9c1b5664a 135 #endif /* DNS_DEBUG */
AndyA 22:0dd9c1b5664a 136
AndyA 22:0dd9c1b5664a 137 #if LWIP_DNS_API_HOSTENT_STORAGE
AndyA 22:0dd9c1b5664a 138 /* this function should return the "per-thread" hostent after copy from s_hostent */
AndyA 22:0dd9c1b5664a 139 return sys_thread_hostent(&s_hostent);
AndyA 22:0dd9c1b5664a 140 #else
AndyA 22:0dd9c1b5664a 141 return &s_hostent;
AndyA 22:0dd9c1b5664a 142 #endif /* LWIP_DNS_API_HOSTENT_STORAGE */
AndyA 22:0dd9c1b5664a 143 }
AndyA 22:0dd9c1b5664a 144
AndyA 22:0dd9c1b5664a 145 /**
AndyA 22:0dd9c1b5664a 146 * Thread-safe variant of lwip_gethostbyname: instead of using a static
AndyA 22:0dd9c1b5664a 147 * buffer, this function takes buffer and errno pointers as arguments
AndyA 22:0dd9c1b5664a 148 * and uses these for the result.
AndyA 22:0dd9c1b5664a 149 *
AndyA 22:0dd9c1b5664a 150 * @param name the hostname to resolve
AndyA 22:0dd9c1b5664a 151 * @param ret pre-allocated struct where to store the result
AndyA 22:0dd9c1b5664a 152 * @param buf pre-allocated buffer where to store additional data
AndyA 22:0dd9c1b5664a 153 * @param buflen the size of buf
AndyA 22:0dd9c1b5664a 154 * @param result pointer to a hostent pointer that is set to ret on success
AndyA 22:0dd9c1b5664a 155 * and set to zero on error
AndyA 22:0dd9c1b5664a 156 * @param h_errnop pointer to an int where to store errors (instead of modifying
AndyA 22:0dd9c1b5664a 157 * the global h_errno)
AndyA 22:0dd9c1b5664a 158 * @return 0 on success, non-zero on error, additional error information
AndyA 22:0dd9c1b5664a 159 * is stored in *h_errnop instead of h_errno to be thread-safe
AndyA 22:0dd9c1b5664a 160 */
AndyA 22:0dd9c1b5664a 161 int
AndyA 22:0dd9c1b5664a 162 lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
AndyA 22:0dd9c1b5664a 163 size_t buflen, struct hostent **result, int *h_errnop)
AndyA 22:0dd9c1b5664a 164 {
AndyA 22:0dd9c1b5664a 165 err_t err;
AndyA 22:0dd9c1b5664a 166 struct gethostbyname_r_helper *h;
AndyA 22:0dd9c1b5664a 167 char *hostname;
AndyA 22:0dd9c1b5664a 168 size_t namelen;
AndyA 22:0dd9c1b5664a 169 int lh_errno;
AndyA 22:0dd9c1b5664a 170
AndyA 22:0dd9c1b5664a 171 if (h_errnop == NULL) {
AndyA 22:0dd9c1b5664a 172 /* ensure h_errnop is never NULL */
AndyA 22:0dd9c1b5664a 173 h_errnop = &lh_errno;
AndyA 22:0dd9c1b5664a 174 }
AndyA 22:0dd9c1b5664a 175
AndyA 22:0dd9c1b5664a 176 if (result == NULL) {
AndyA 22:0dd9c1b5664a 177 /* not all arguments given */
AndyA 22:0dd9c1b5664a 178 *h_errnop = EINVAL;
AndyA 22:0dd9c1b5664a 179 return -1;
AndyA 22:0dd9c1b5664a 180 }
AndyA 22:0dd9c1b5664a 181 /* first thing to do: set *result to nothing */
AndyA 22:0dd9c1b5664a 182 *result = NULL;
AndyA 22:0dd9c1b5664a 183 if ((name == NULL) || (ret == NULL) || (buf == 0)) {
AndyA 22:0dd9c1b5664a 184 /* not all arguments given */
AndyA 22:0dd9c1b5664a 185 *h_errnop = EINVAL;
AndyA 22:0dd9c1b5664a 186 return -1;
AndyA 22:0dd9c1b5664a 187 }
AndyA 22:0dd9c1b5664a 188
AndyA 22:0dd9c1b5664a 189 namelen = strlen(name);
AndyA 22:0dd9c1b5664a 190 if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
AndyA 22:0dd9c1b5664a 191 /* buf can't hold the data needed + a copy of name */
AndyA 22:0dd9c1b5664a 192 *h_errnop = ERANGE;
AndyA 22:0dd9c1b5664a 193 return -1;
AndyA 22:0dd9c1b5664a 194 }
AndyA 22:0dd9c1b5664a 195
AndyA 22:0dd9c1b5664a 196 h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
AndyA 22:0dd9c1b5664a 197 hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
AndyA 22:0dd9c1b5664a 198
AndyA 22:0dd9c1b5664a 199 /* query host IP address */
AndyA 22:0dd9c1b5664a 200 err = netconn_gethostbyname(name, &(h->addr));
AndyA 22:0dd9c1b5664a 201 if (err != ERR_OK) {
AndyA 22:0dd9c1b5664a 202 LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
AndyA 22:0dd9c1b5664a 203 *h_errnop = ENSRNOTFOUND;
AndyA 22:0dd9c1b5664a 204 return -1;
AndyA 22:0dd9c1b5664a 205 }
AndyA 22:0dd9c1b5664a 206
AndyA 22:0dd9c1b5664a 207 /* copy the hostname into buf */
AndyA 22:0dd9c1b5664a 208 MEMCPY(hostname, name, namelen);
AndyA 22:0dd9c1b5664a 209 hostname[namelen] = 0;
AndyA 22:0dd9c1b5664a 210
AndyA 22:0dd9c1b5664a 211 /* fill hostent */
AndyA 22:0dd9c1b5664a 212 h->addrs = &(h->addr);
AndyA 22:0dd9c1b5664a 213 h->aliases = NULL;
AndyA 22:0dd9c1b5664a 214 ret->h_name = (char*)hostname;
AndyA 22:0dd9c1b5664a 215 ret->h_aliases = &(h->aliases);
AndyA 22:0dd9c1b5664a 216 ret->h_addrtype = AF_INET;
AndyA 22:0dd9c1b5664a 217 ret->h_length = sizeof(ip_addr_t);
AndyA 22:0dd9c1b5664a 218 ret->h_addr_list = (char**)&(h->addrs);
AndyA 22:0dd9c1b5664a 219
AndyA 22:0dd9c1b5664a 220 /* set result != NULL */
AndyA 22:0dd9c1b5664a 221 *result = ret;
AndyA 22:0dd9c1b5664a 222
AndyA 22:0dd9c1b5664a 223 /* return success */
AndyA 22:0dd9c1b5664a 224 return 0;
AndyA 22:0dd9c1b5664a 225 }
AndyA 22:0dd9c1b5664a 226
AndyA 22:0dd9c1b5664a 227 /**
AndyA 22:0dd9c1b5664a 228 * Frees one or more addrinfo structures returned by getaddrinfo(), along with
AndyA 22:0dd9c1b5664a 229 * any additional storage associated with those structures. If the ai_next field
AndyA 22:0dd9c1b5664a 230 * of the structure is not null, the entire list of structures is freed.
AndyA 22:0dd9c1b5664a 231 *
AndyA 22:0dd9c1b5664a 232 * @param ai struct addrinfo to free
AndyA 22:0dd9c1b5664a 233 */
AndyA 22:0dd9c1b5664a 234 void
AndyA 22:0dd9c1b5664a 235 lwip_freeaddrinfo(struct addrinfo *ai)
AndyA 22:0dd9c1b5664a 236 {
AndyA 22:0dd9c1b5664a 237 struct addrinfo *next;
AndyA 22:0dd9c1b5664a 238
AndyA 22:0dd9c1b5664a 239 while (ai != NULL) {
AndyA 22:0dd9c1b5664a 240 next = ai->ai_next;
AndyA 22:0dd9c1b5664a 241 memp_free(MEMP_NETDB, ai);
AndyA 22:0dd9c1b5664a 242 ai = next;
AndyA 22:0dd9c1b5664a 243 }
AndyA 22:0dd9c1b5664a 244 }
AndyA 22:0dd9c1b5664a 245
AndyA 22:0dd9c1b5664a 246 /**
AndyA 22:0dd9c1b5664a 247 * Translates the name of a service location (for example, a host name) and/or
AndyA 22:0dd9c1b5664a 248 * a service name and returns a set of socket addresses and associated
AndyA 22:0dd9c1b5664a 249 * information to be used in creating a socket with which to address the
AndyA 22:0dd9c1b5664a 250 * specified service.
AndyA 22:0dd9c1b5664a 251 * Memory for the result is allocated internally and must be freed by calling
AndyA 22:0dd9c1b5664a 252 * lwip_freeaddrinfo()!
AndyA 22:0dd9c1b5664a 253 *
AndyA 22:0dd9c1b5664a 254 * Due to a limitation in dns_gethostbyname, only the first address of a
AndyA 22:0dd9c1b5664a 255 * host is returned.
AndyA 22:0dd9c1b5664a 256 * Also, service names are not supported (only port numbers)!
AndyA 22:0dd9c1b5664a 257 *
AndyA 22:0dd9c1b5664a 258 * @param nodename descriptive name or address string of the host
AndyA 22:0dd9c1b5664a 259 * (may be NULL -> local address)
AndyA 22:0dd9c1b5664a 260 * @param servname port number as string of NULL
AndyA 22:0dd9c1b5664a 261 * @param hints structure containing input values that set socktype and protocol
AndyA 22:0dd9c1b5664a 262 * @param res pointer to a pointer where to store the result (set to NULL on failure)
AndyA 22:0dd9c1b5664a 263 * @return 0 on success, non-zero on failure
AndyA 22:0dd9c1b5664a 264 */
AndyA 22:0dd9c1b5664a 265 int
AndyA 22:0dd9c1b5664a 266 lwip_getaddrinfo(const char *nodename, const char *servname,
AndyA 22:0dd9c1b5664a 267 const struct addrinfo *hints, struct addrinfo **res)
AndyA 22:0dd9c1b5664a 268 {
AndyA 22:0dd9c1b5664a 269 err_t err;
AndyA 22:0dd9c1b5664a 270 ip_addr_t addr;
AndyA 22:0dd9c1b5664a 271 struct addrinfo *ai;
AndyA 22:0dd9c1b5664a 272 struct sockaddr_in *sa = NULL;
AndyA 22:0dd9c1b5664a 273 int port_nr = 0;
AndyA 22:0dd9c1b5664a 274 size_t total_size;
AndyA 22:0dd9c1b5664a 275 size_t namelen = 0;
AndyA 22:0dd9c1b5664a 276
AndyA 22:0dd9c1b5664a 277 if (res == NULL) {
AndyA 22:0dd9c1b5664a 278 return EAI_FAIL;
AndyA 22:0dd9c1b5664a 279 }
AndyA 22:0dd9c1b5664a 280 *res = NULL;
AndyA 22:0dd9c1b5664a 281 if ((nodename == NULL) && (servname == NULL)) {
AndyA 22:0dd9c1b5664a 282 return EAI_NONAME;
AndyA 22:0dd9c1b5664a 283 }
AndyA 22:0dd9c1b5664a 284
AndyA 22:0dd9c1b5664a 285 if (servname != NULL) {
AndyA 22:0dd9c1b5664a 286 /* service name specified: convert to port number
AndyA 22:0dd9c1b5664a 287 * @todo?: currently, only ASCII integers (port numbers) are supported! */
AndyA 22:0dd9c1b5664a 288 port_nr = atoi(servname);
AndyA 22:0dd9c1b5664a 289 if ((port_nr <= 0) || (port_nr > 0xffff)) {
AndyA 22:0dd9c1b5664a 290 return EAI_SERVICE;
AndyA 22:0dd9c1b5664a 291 }
AndyA 22:0dd9c1b5664a 292 }
AndyA 22:0dd9c1b5664a 293
AndyA 22:0dd9c1b5664a 294 if (nodename != NULL) {
AndyA 22:0dd9c1b5664a 295 /* service location specified, try to resolve */
AndyA 22:0dd9c1b5664a 296 err = netconn_gethostbyname(nodename, &addr);
AndyA 22:0dd9c1b5664a 297 if (err != ERR_OK) {
AndyA 22:0dd9c1b5664a 298 return EAI_FAIL;
AndyA 22:0dd9c1b5664a 299 }
AndyA 22:0dd9c1b5664a 300 } else {
AndyA 22:0dd9c1b5664a 301 /* service location specified, use loopback address */
AndyA 22:0dd9c1b5664a 302 ip_addr_set_loopback(&addr);
AndyA 22:0dd9c1b5664a 303 }
AndyA 22:0dd9c1b5664a 304
AndyA 22:0dd9c1b5664a 305 total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
AndyA 22:0dd9c1b5664a 306 if (nodename != NULL) {
AndyA 22:0dd9c1b5664a 307 namelen = strlen(nodename);
AndyA 22:0dd9c1b5664a 308 LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
AndyA 22:0dd9c1b5664a 309 total_size += namelen + 1;
AndyA 22:0dd9c1b5664a 310 }
AndyA 22:0dd9c1b5664a 311 /* If this fails, please report to lwip-devel! :-) */
AndyA 22:0dd9c1b5664a 312 LWIP_ASSERT("total_size <= NETDB_ELEM_SIZE: please report this!",
AndyA 22:0dd9c1b5664a 313 total_size <= NETDB_ELEM_SIZE);
AndyA 22:0dd9c1b5664a 314 ai = (struct addrinfo *)memp_malloc(MEMP_NETDB);
AndyA 22:0dd9c1b5664a 315 if (ai == NULL) {
AndyA 22:0dd9c1b5664a 316 goto memerr;
AndyA 22:0dd9c1b5664a 317 }
AndyA 22:0dd9c1b5664a 318 memset(ai, 0, total_size);
AndyA 22:0dd9c1b5664a 319 sa = (struct sockaddr_in*)((u8_t*)ai + sizeof(struct addrinfo));
AndyA 22:0dd9c1b5664a 320 /* set up sockaddr */
AndyA 22:0dd9c1b5664a 321 inet_addr_from_ipaddr(&sa->sin_addr, &addr);
AndyA 22:0dd9c1b5664a 322 sa->sin_family = AF_INET;
AndyA 22:0dd9c1b5664a 323 sa->sin_len = sizeof(struct sockaddr_in);
AndyA 22:0dd9c1b5664a 324 sa->sin_port = htons((u16_t)port_nr);
AndyA 22:0dd9c1b5664a 325
AndyA 22:0dd9c1b5664a 326 /* set up addrinfo */
AndyA 22:0dd9c1b5664a 327 ai->ai_family = AF_INET;
AndyA 22:0dd9c1b5664a 328 if (hints != NULL) {
AndyA 22:0dd9c1b5664a 329 /* copy socktype & protocol from hints if specified */
AndyA 22:0dd9c1b5664a 330 ai->ai_socktype = hints->ai_socktype;
AndyA 22:0dd9c1b5664a 331 ai->ai_protocol = hints->ai_protocol;
AndyA 22:0dd9c1b5664a 332 }
AndyA 22:0dd9c1b5664a 333 if (nodename != NULL) {
AndyA 22:0dd9c1b5664a 334 /* copy nodename to canonname if specified */
AndyA 22:0dd9c1b5664a 335 ai->ai_canonname = ((char*)ai + sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
AndyA 22:0dd9c1b5664a 336 MEMCPY(ai->ai_canonname, nodename, namelen);
AndyA 22:0dd9c1b5664a 337 ai->ai_canonname[namelen] = 0;
AndyA 22:0dd9c1b5664a 338 }
AndyA 22:0dd9c1b5664a 339 ai->ai_addrlen = sizeof(struct sockaddr_in);
AndyA 22:0dd9c1b5664a 340 ai->ai_addr = (struct sockaddr*)sa;
AndyA 22:0dd9c1b5664a 341
AndyA 22:0dd9c1b5664a 342 *res = ai;
AndyA 22:0dd9c1b5664a 343
AndyA 22:0dd9c1b5664a 344 return 0;
AndyA 22:0dd9c1b5664a 345 memerr:
AndyA 22:0dd9c1b5664a 346 if (ai != NULL) {
AndyA 22:0dd9c1b5664a 347 memp_free(MEMP_NETDB, ai);
AndyA 22:0dd9c1b5664a 348 }
AndyA 22:0dd9c1b5664a 349 return EAI_MEMORY;
AndyA 22:0dd9c1b5664a 350 }
AndyA 22:0dd9c1b5664a 351
AndyA 22:0dd9c1b5664a 352 #endif /* LWIP_DNS && LWIP_SOCKET */