Keil Studio Cloud
Mistake on this page?
Report an issue in GitHub or email us
lwip/netdb.h
Go to the documentation of this file.
1 /**
2  * @file
3  * NETDB API (sockets)
4  */
5 
6 /*
7  * Redistribution and use in source and binary forms, with or without modification,
8  * are permitted provided that the following conditions are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright notice,
11  * this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  * derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
21  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
23  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
27  * OF SUCH DAMAGE.
28  *
29  * This file is part of the lwIP TCP/IP stack.
30  *
31  * Author: Simon Goldschmidt
32  *
33  */
34 #ifndef LWIP_HDR_NETDB_H
35 #define LWIP_HDR_NETDB_H
36 
37 #include "lwip/opt.h"
38 
39 #if LWIP_DNS && LWIP_SOCKET
40 
41 #include "lwip/arch.h"
42 #include "lwip/inet.h"
43 #include "lwip/sockets.h"
44 
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48 
49 /* some rarely used options */
50 #ifndef LWIP_DNS_API_DECLARE_H_ERRNO
51 #define LWIP_DNS_API_DECLARE_H_ERRNO 1
52 #endif
53 
54 #ifndef LWIP_DNS_API_DEFINE_ERRORS
55 #define LWIP_DNS_API_DEFINE_ERRORS 1
56 #endif
57 
58 #ifndef LWIP_DNS_API_DEFINE_FLAGS
59 #define LWIP_DNS_API_DEFINE_FLAGS 1
60 #endif
61 
62 #ifndef LWIP_DNS_API_DECLARE_STRUCTS
63 #define LWIP_DNS_API_DECLARE_STRUCTS 1
64 #endif
65 
66 #if LWIP_DNS_API_DEFINE_ERRORS
67 /** Errors used by the DNS API functions, h_errno can be one of them */
68 #define EAI_NONAME 200
69 #define EAI_SERVICE 201
70 #define EAI_FAIL 202
71 #define EAI_MEMORY 203
72 #define EAI_FAMILY 204
73 
74 #define HOST_NOT_FOUND 210
75 #define NO_DATA 211
76 #define NO_RECOVERY 212
77 #define TRY_AGAIN 213
78 #endif /* LWIP_DNS_API_DEFINE_ERRORS */
79 
80 #if LWIP_DNS_API_DEFINE_FLAGS
81 /* input flags for struct addrinfo */
82 #define AI_PASSIVE 0x01
83 #define AI_CANONNAME 0x02
84 #define AI_NUMERICHOST 0x04
85 #define AI_NUMERICSERV 0x08
86 #define AI_V4MAPPED 0x10
87 #define AI_ALL 0x20
88 #define AI_ADDRCONFIG 0x40
89 #endif /* LWIP_DNS_API_DEFINE_FLAGS */
90 
91 #if LWIP_DNS_API_DECLARE_STRUCTS
92 struct hostent {
93  char *h_name; /* Official name of the host. */
94  char **h_aliases; /* A pointer to an array of pointers to alternative host names,
95  terminated by a null pointer. */
96  int h_addrtype; /* Address type. */
97  int h_length; /* The length, in bytes, of the address. */
98  char **h_addr_list; /* A pointer to an array of pointers to network addresses (in
99  network byte order) for the host, terminated by a null pointer. */
100 #define h_addr h_addr_list[0] /* for backward compatibility */
101 };
102 
103 struct addrinfo {
104  int ai_flags; /* Input flags. */
105  int ai_family; /* Address family of socket. */
106  int ai_socktype; /* Socket type. */
107  int ai_protocol; /* Protocol of socket. */
108  socklen_t ai_addrlen; /* Length of socket address. */
109  struct sockaddr *ai_addr; /* Socket address of socket. */
110  char *ai_canonname; /* Canonical name of service location. */
111  struct addrinfo *ai_next; /* Pointer to next in list. */
112 };
113 #endif /* LWIP_DNS_API_DECLARE_STRUCTS */
114 
115 #define NETDB_ELEM_SIZE (sizeof(struct addrinfo) + sizeof(struct sockaddr_storage) + DNS_MAX_NAME_LENGTH + 1)
116 
117 #if LWIP_DNS_API_DECLARE_H_ERRNO
118 /* application accessible error code set by the DNS API functions */
119 extern int h_errno;
120 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO*/
121 
122 struct hostent *lwip_gethostbyname(const char *name);
123 int lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
124  size_t buflen, struct hostent **result, int *h_errnop);
125 void lwip_freeaddrinfo(struct addrinfo *ai);
126 int lwip_getaddrinfo(const char *nodename,
127  const char *servname,
128  const struct addrinfo *hints,
129  struct addrinfo **res);
130 
131 #if LWIP_COMPAT_SOCKETS
132 /** @ingroup netdbapi */
133 #define gethostbyname(name) lwip_gethostbyname(name)
134 /** @ingroup netdbapi */
135 #define gethostbyname_r(name, ret, buf, buflen, result, h_errnop) \
136  lwip_gethostbyname_r(name, ret, buf, buflen, result, h_errnop)
137 /** @ingroup netdbapi */
138 #define freeaddrinfo(addrinfo) lwip_freeaddrinfo(addrinfo)
139 /** @ingroup netdbapi */
140 #define getaddrinfo(nodname, servname, hints, res) \
141  lwip_getaddrinfo(nodname, servname, hints, res)
142 #endif /* LWIP_COMPAT_SOCKETS */
143 
144 #ifdef __cplusplus
145 }
146 #endif
147 
148 #endif /* LWIP_DNS && LWIP_SOCKET */
149 
150 #endif /* LWIP_HDR_NETDB_H */
opt.h
lwIP Options Configuration
inet.h
This file (together with sockets.h) aims to provide structs and functions from.
arch.h
Support for different processor and compiler architectures.
sockets.h
Socket API (to be used from non-TCPIP threads)
Important Information for this Arm website

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies. If you are not happy with the use of these cookies, please review our Cookie Policy to learn how they can be disabled. By disabling cookies, some features of the site will not work.