cpython/Modules/getnameinfo.c at main · python/cpython · GitHub

History

207 lines (190 loc) · 6.03 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

* 3. Neither the name of the project nor the names of its contributors

* may be used to endorse or promote products derived from this software

* without specific prior written permission.

* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND

* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE

* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

* SUCH DAMAGE.

* Issues to be discussed:

* - Thread safe-ness must be checked

* - Return values. There seems to be no standard for return value (RFC2133)

* but INRIA implementation returns EAI_xxx defined for getaddrinfo().

#if 0

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <arpa/nameser.h>

#include <netdb.h>

#include <resolv.h>

#include <string.h>

#include <stddef.h>

#include "addrinfo.h"

#endif

#ifdef HAVE_NETDB_H

#define HAVE_GETNAMEINFO 1

#define SUCCESS 0

#define YES 1

#define NO 0

static struct gni_afd {

int a_af;

int a_addrlen;

int a_socklen;

int a_off;

} gni_afdl [] = {

#ifdef ENABLE_IPV6

{PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),

offsetof(struct sockaddr_in6, sin6_addr)},

#endif

{PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),

offsetof(struct sockaddr_in, sin_addr)},

{0, 0, 0},

};

struct gni_sockinet {

u_char si_len;

u_char si_family;

u_short si_port;

};

#define ENI_NOSOCKET 0

#define ENI_NOSERVNAME 1

#define ENI_NOHOSTNAME 2

#define ENI_MEMORY 3

#define ENI_SYSTEM 4

#define ENI_FAMILY 5

#define ENI_SALEN 6

int

getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t hostlen,

char *serv, size_t servlen, int flags)

{

struct gni_afd *gni_afd;

struct servent *sp;

struct hostent *hp;

u_short port;

int family, len, i;

char *addr, *p;

u_long v4a;

#ifdef ENABLE_IPV6

u_char pfx;

int h_error;

#endif

char numserv[512];

char numaddr[512];

if (sa == NULL)

return ENI_NOSOCKET;

#ifdef HAVE_SOCKADDR_SA_LEN

len = sa->sa_len;

if (len != salen) return ENI_SALEN;

#else

len = salen;

#endif

family = sa->sa_family;

for (i = 0; gni_afdl[i].a_af; i++)

if (gni_afdl[i].a_af == family) {

gni_afd = &gni_afdl[i];

goto found;

}

return ENI_FAMILY;

found:

if (len != gni_afd->a_socklen) return ENI_SALEN;

port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */

addr = (char *)sa + gni_afd->a_off;

if (serv == NULL || servlen == 0) {

/* what we should do? */

} else if (flags & NI_NUMERICSERV) {

sprintf(numserv, "%d", ntohs(port));

if (strlen(numserv) > servlen)

return ENI_MEMORY;

strcpy(serv, numserv);

} else {

sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");

if (sp) {

if (strlen(sp->s_name) > servlen)

return ENI_MEMORY;

strcpy(serv, sp->s_name);

} else

return ENI_NOSERVNAME;

}

switch (sa->sa_family) {

case AF_INET:

v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;

if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))

flags |= NI_NUMERICHOST;

v4a >>= IN_CLASSA_NSHIFT;

if (v4a == 0 || v4a == IN_LOOPBACKNET)

flags |= NI_NUMERICHOST;

break;

#ifdef ENABLE_IPV6

case AF_INET6:

pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0];

if (pfx == 0 || pfx == 0xfe || pfx == 0xff)

flags |= NI_NUMERICHOST;

break;

#endif

}

if (host == NULL || hostlen == 0) {

/* what should we do? */

} else if (flags & NI_NUMERICHOST) {

if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))

== NULL)

return ENI_SYSTEM;

if (strlen(numaddr) > hostlen)

return ENI_MEMORY;

strcpy(host, numaddr);

} else {

#ifdef ENABLE_IPV6

hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error);

#else

hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af);

#endif

if (hp) {

if (flags & NI_NOFQDN) {

p = strchr(hp->h_name, '.');

if (p) *p = '\0';

}

if (strlen(hp->h_name) > hostlen) {

#ifdef ENABLE_IPV6

freehostent(hp);

#endif

return ENI_MEMORY;

}

strcpy(host, hp->h_name);

#ifdef ENABLE_IPV6

freehostent(hp);

#endif

} else {

if (flags & NI_NAMEREQD)

return ENI_NOHOSTNAME;

if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))

== NULL)

return ENI_NOHOSTNAME;

if (strlen(numaddr) > hostlen)

return ENI_MEMORY;

strcpy(host, numaddr);

}

return SUCCESS;

}

#endif // HAVE_NETDB_H

cpython/Modules/getnameinfo.c at main · python/cpython · GitHub

Uh oh!

Expand file tree

Breadcrumbs

getnameinfo.c

Latest commit

History

Breadcrumbs

getnameinfo.c

File metadata and controls