Mercurial > cpython-lru_cache-weakref
annotate Modules/socketmodule.c @ 892:11ea669c231e legacy-trunk
Documented new contents of lib5.tex
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Wed, 03 Jun 1992 17:56:44 +0000 |
| parents | 0cd197947d81 |
| children | 6459e2f21bf6 |
| rev | line source |
|---|---|
| 294 | 1 /*********************************************************** |
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2 Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The |
| 294 | 3 Netherlands. |
| 4 | |
| 5 All Rights Reserved | |
| 6 | |
| 7 Permission to use, copy, modify, and distribute this software and its | |
| 8 documentation for any purpose and without fee is hereby granted, | |
| 9 provided that the above copyright notice appear in all copies and that | |
| 10 both that copyright notice and this permission notice appear in | |
| 11 supporting documentation, and that the names of Stichting Mathematisch | |
| 12 Centrum or CWI not be used in advertising or publicity pertaining to | |
| 13 distribution of the software without specific, written prior permission. | |
| 14 | |
| 15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO | |
| 16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE | |
| 18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 22 | |
| 23 ******************************************************************/ | |
| 24 | |
| 25 /* Socket module */ | |
| 26 | |
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27 /* XXX Ought to fix getStr*arg calls to use getargs(args, "s#", ...) */ |
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28 |
| 294 | 29 /* |
| 30 This module provides an interface to Berkeley socket IPC. | |
| 31 | |
| 32 Limitations: | |
| 33 | |
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34 - only AF_INET and AF_UNIX address families are supported |
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35 - no asynchronous I/O (but read polling: avail) |
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36 - no read/write operations (use send/recv or makefile instead) |
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37 - no flags on sendto/recvfrom operations |
| 396 | 38 - no general setsockopt() call (but see s.allowbroadcast()) |
| 294 | 39 |
| 40 Interface: | |
| 41 | |
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42 - socket.gethostname() --> host name (string) |
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43 - socket.gethostbyname(hostname) --> host IP address (string: 'dd.dd.dd.dd') |
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44 - socket.getservbyname(servername, protocolname) --> port number |
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45 - socket.socket(family, type [, proto]) --> new socket object |
| 294 | 46 - family and type constants from <socket.h> are accessed as socket.AF_INET etc. |
| 47 - errors are reported as the exception socket.error | |
| 48 - an Internet socket address is a pair (hostname, port) | |
| 49 where hostname can be anything recognized by gethostbyname() | |
| 50 (including the dd.dd.dd.dd notation) and port is in host byte order | |
| 51 - where a hostname is returned, the dd.dd.dd.dd notation is used | |
| 52 - a UNIX domain socket is a string specifying the pathname | |
| 53 | |
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54 Socket methods: |
| 294 | 55 |
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56 - s.accept() --> new socket object, sockaddr |
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57 - s.avail() --> boolean |
| 396 | 58 - s.allowbroadcast(boolean) --> None |
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59 - s.bind(sockaddr) --> None |
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60 - s.connect(sockaddr) --> None |
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61 - s.listen(n) --> None |
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62 - s.makefile(mode) --> file object |
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63 - s.recv(nbytes) --> string |
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64 - s.recvfrom(nbytes) --> string, sockaddr |
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65 - s.send(string) --> None |
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66 - s.sendto(string, sockaddr) --> None |
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67 - s.shutdown(how) --> None |
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68 - s.close() --> None |
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69 |
| 294 | 70 */ |
| 71 | |
| 72 #include "allobjects.h" | |
| 73 #include "modsupport.h" | |
| 74 | |
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75 #include <signal.h> |
| 294 | 76 #include <sys/types.h> |
| 77 #include <sys/socket.h> | |
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78 #include <sys/time.h> /* Needed for struct timeval */ |
| 294 | 79 #include <netinet/in.h> |
| 80 #include <sys/un.h> | |
| 81 #include <netdb.h> | |
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82 #ifdef _AIX /* I *think* this works */ |
| 454 | 83 /* AIX defines fd_set in a separate file. Sigh... */ |
| 84 #include <sys/select.h> | |
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85 #endif |
| 294 | 86 |
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87 |
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88 /* Global variable holding the exception type for errors detected |
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89 by this module (but not argument type or memory errors, etc.). */ |
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90 |
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91 static object *SocketError; |
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92 |
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93 |
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94 /* Convenience function to raise an error according to errno |
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95 and return a NULL pointer from a function. */ |
| 294 | 96 |
| 97 static object * | |
| 98 socket_error() | |
| 99 { | |
| 100 return err_errno(SocketError); | |
| 101 } | |
| 102 | |
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103 |
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104 /* The object holding a socket. It holds some extra information, |
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105 like the address family, which is used to decode socket address |
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106 arguments properly. */ |
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107 |
| 294 | 108 typedef struct { |
| 109 OB_HEAD | |
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110 int sock_fd; /* Socket file descriptor */ |
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111 int sock_family; /* Address family, e.g., AF_INET */ |
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112 int sock_type; /* Socket type, e.g., SOCK_STREAM */ |
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113 int sock_proto; /* Protocol type, usually 0 */ |
| 294 | 114 } sockobject; |
| 115 | |
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116 |
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117 /* A forward reference to the Socktype type object. |
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118 The Socktype variable contains pointers to various functions, |
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119 some of which call newsocobject(), which uses Socktype, so |
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120 there has to be a circular reference. */ |
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121 |
| 294 | 122 extern typeobject Socktype; /* Forward */ |
| 123 | |
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124 |
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125 /* Create a new socket object. |
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126 This just creates the object and initializes it. |
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127 If the creation fails, return NULL and set an exception (implicit |
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128 in NEWOBJ()). */ |
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129 |
| 294 | 130 static sockobject * |
| 131 newsockobject(fd, family, type, proto) | |
| 132 int fd, family, type, proto; | |
| 133 { | |
| 134 sockobject *s; | |
| 135 s = NEWOBJ(sockobject, &Socktype); | |
| 136 if (s != NULL) { | |
| 137 s->sock_fd = fd; | |
| 138 s->sock_family = family; | |
| 139 s->sock_type = type; | |
| 140 s->sock_proto = proto; | |
| 141 } | |
| 142 return s; | |
| 143 } | |
| 144 | |
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145 |
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146 /* Convert a string specifying a host name or one of a few symbolic |
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147 names to a numeric IP address. This usually calls gethostbyname() |
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148 to do the work; the names "" and "<broadcast>" are special. |
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149 Return the length (should always be 4 bytes), or negative if |
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150 an error occurred; then an exception is raised. */ |
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151 |
| 294 | 152 static int |
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153 setipaddr(name, addr_ret) |
| 294 | 154 char *name; |
| 155 struct sockaddr_in *addr_ret; | |
| 156 { | |
| 157 struct hostent *hp; | |
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158 int d1, d2, d3, d4; |
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159 char ch; |
| 294 | 160 |
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161 if (name[0] == '\0') { |
| 294 | 162 addr_ret->sin_addr.s_addr = INADDR_ANY; |
| 163 return 4; | |
| 164 } | |
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165 if (name[0] == '<' && strcmp(name, "<broadcast>") == 0) { |
| 294 | 166 addr_ret->sin_addr.s_addr = INADDR_BROADCAST; |
| 167 return 4; | |
| 168 } | |
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169 if (sscanf(name, "%d.%d.%d.%d%c", &d1, &d2, &d3, &d4, &ch) == 4 && |
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170 0 <= d1 && d1 <= 255 && 0 <= d2 && d2 <= 255 && |
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171 0 <= d3 && d3 <= 255 && 0 <= d4 && d4 <= 255) { |
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172 addr_ret->sin_addr.s_addr = htonl( |
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173 ((long) d1 << 24) | ((long) d2 << 16) | |
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174 ((long) d3 << 8) | ((long) d4 << 0)); |
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175 return 4; |
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176 } |
| 294 | 177 hp = gethostbyname(name); |
| 178 if (hp == NULL) { | |
| 179 err_setstr(SocketError, "host not found"); | |
| 180 return -1; | |
| 181 } | |
| 182 memcpy((char *) &addr_ret->sin_addr, hp->h_addr, hp->h_length); | |
| 183 return hp->h_length; | |
| 184 } | |
| 185 | |
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186 |
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187 /* Generally useful convenience function to create a tuple from two |
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188 objects. This eats references to the objects; if either is NULL |
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189 it destroys the other and returns NULL without raising an exception |
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190 (assuming the function that was called to create the argument must |
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191 have raised an exception and returned NULL). */ |
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192 |
| 294 | 193 static object * |
| 194 makepair(a, b) | |
| 195 object *a, *b; | |
| 196 { | |
| 197 object *pair = NULL; | |
| 198 if (a == NULL || b == NULL || (pair = newtupleobject(2)) == NULL) { | |
| 199 XDECREF(a); | |
| 200 XDECREF(b); | |
| 201 return NULL; | |
| 202 } | |
| 203 settupleitem(pair, 0, a); | |
| 204 settupleitem(pair, 1, b); | |
| 205 return pair; | |
| 206 } | |
| 207 | |
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208 |
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209 /* Create a string object representing an IP address. |
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210 This is always a string of the form 'dd.dd.dd.dd' (with variable |
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211 size numbers). */ |
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212 |
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213 static object * |
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214 makeipaddr(addr) |
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215 struct sockaddr_in *addr; |
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216 { |
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217 long x = ntohl(addr->sin_addr.s_addr); |
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218 char buf[100]; |
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219 sprintf(buf, "%d.%d.%d.%d", |
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220 (int) (x>>24) & 0xff, (int) (x>>16) & 0xff, |
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221 (int) (x>> 8) & 0xff, (int) (x>> 0) & 0xff); |
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222 return newstringobject(buf); |
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223 } |
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224 |
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225 |
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226 /* Create an object representing the given socket address, |
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227 suitable for passing it back to bind(), connect() etc. |
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228 The family field of the sockaddr structure is inspected |
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229 to determine what kind of address it really is. */ |
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230 |
| 294 | 231 /*ARGSUSED*/ |
| 232 static object * | |
| 233 makesockaddr(addr, addrlen) | |
| 234 struct sockaddr *addr; | |
| 235 int addrlen; | |
| 236 { | |
|
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237 switch (addr->sa_family) { |
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238 |
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239 case AF_INET: |
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240 { |
| 294 | 241 struct sockaddr_in *a = (struct sockaddr_in *) addr; |
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242 return makepair(makeipaddr(a), |
| 294 | 243 newintobject((long) ntohs(a->sin_port))); |
| 244 } | |
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245 |
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246 case AF_UNIX: |
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247 { |
| 294 | 248 struct sockaddr_un *a = (struct sockaddr_un *) addr; |
| 249 return newstringobject(a->sun_path); | |
| 250 } | |
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251 |
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252 /* More cases here... */ |
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253 |
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254 default: |
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255 err_setstr(SocketError, "return unknown socket address type"); |
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256 return NULL; |
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257 } |
| 294 | 258 } |
| 259 | |
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260 |
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261 /* Parse a socket address argument according to the socket object's |
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262 address family. Return 1 if the address was in the proper format, |
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263 0 of not. The address is returned through addr_ret, its length |
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264 through len_ret. */ |
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265 |
| 294 | 266 static int |
| 267 getsockaddrarg(s, args, addr_ret, len_ret) | |
| 268 sockobject *s; | |
| 269 object *args; | |
| 270 struct sockaddr **addr_ret; | |
| 271 int *len_ret; | |
| 272 { | |
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273 switch (s->sock_family) { |
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274 |
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275 case AF_UNIX: |
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276 { |
| 294 | 277 static struct sockaddr_un addr; |
| 278 object *path; | |
| 279 int len; | |
|
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280 if (!getStrarg(args, &path)) |
| 294 | 281 return 0; |
|
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282 if ((len = getstringsize(path)) > sizeof addr.sun_path) { |
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283 err_setstr(SocketError, "AF_UNIX path too long"); |
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284 return 0; |
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285 } |
| 294 | 286 addr.sun_family = AF_UNIX; |
| 287 memcpy(addr.sun_path, getstringvalue(path), len); | |
| 288 *addr_ret = (struct sockaddr *) &addr; | |
| 289 *len_ret = len + sizeof addr.sun_family; | |
| 290 return 1; | |
| 291 } | |
| 292 | |
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293 case AF_INET: |
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294 { |
| 294 | 295 static struct sockaddr_in addr; |
| 296 object *host; | |
| 297 int port; | |
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298 if (!getStrintarg(args, &host, &port)) |
| 294 | 299 return 0; |
|
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300 if (setipaddr(getstringvalue(host), &addr) < 0) |
| 294 | 301 return 0; |
| 302 addr.sin_family = AF_INET; | |
| 303 addr.sin_port = htons(port); | |
| 304 *addr_ret = (struct sockaddr *) &addr; | |
| 305 *len_ret = sizeof addr; | |
| 306 return 1; | |
| 307 } | |
| 308 | |
|
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309 /* More cases here... */ |
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310 |
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311 default: |
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312 err_setstr(SocketError, "getsockaddrarg: bad family"); |
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313 return 0; |
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314 |
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315 } |
| 294 | 316 } |
| 317 | |
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318 |
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319 /* s.accept() method */ |
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320 |
| 294 | 321 static object * |
| 322 sock_accept(s, args) | |
| 323 sockobject *s; | |
| 324 object *args; | |
| 325 { | |
| 326 char addrbuf[256]; | |
| 327 int addrlen, newfd; | |
| 328 object *res; | |
| 329 if (!getnoarg(args)) | |
| 330 return NULL; | |
| 331 addrlen = sizeof addrbuf; | |
| 332 newfd = accept(s->sock_fd, (struct sockaddr *) addrbuf, &addrlen); | |
| 333 if (newfd < 0) | |
| 334 return socket_error(); | |
|
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335 /* Create the new object with unspecified family, |
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336 to avoid calls to bind() etc. on it. */ |
|
309
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337 res = makepair((object *) newsockobject(newfd, |
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338 s->sock_family, |
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339 s->sock_type, |
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340 s->sock_proto), |
| 294 | 341 makesockaddr((struct sockaddr *) addrbuf, addrlen)); |
| 342 if (res == NULL) | |
| 343 close(newfd); | |
| 344 return res; | |
| 345 } | |
| 346 | |
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347 |
| 396 | 348 /* s.allowbroadcast() method */ |
| 349 | |
| 350 static object * | |
| 351 sock_allowbroadcast(s, args) | |
| 352 sockobject *s; | |
| 353 object *args; | |
| 354 { | |
| 355 int flag; | |
| 356 int res; | |
| 357 if (!getintarg(args, &flag)) | |
| 358 return NULL; | |
| 359 res = setsockopt(s->sock_fd, SOL_SOCKET, SO_BROADCAST, | |
| 360 &flag, sizeof flag); | |
| 361 if (res < 0) | |
| 362 return socket_error(); | |
| 363 INCREF(None); | |
| 364 return None; | |
| 365 } | |
| 366 | |
| 367 | |
|
324
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368 /* s.avail() method */ |
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369 |
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370 static object * |
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371 sock_avail(s, args) |
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372 sockobject *s; |
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373 object *args; |
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374 { |
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375 struct timeval timeout; |
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376 fd_set readers; |
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377 int n; |
| 729 | 378 if (!getnoarg(args)) |
| 379 return NULL; | |
|
324
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380 timeout.tv_sec = 0; |
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381 timeout.tv_usec = 0; |
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382 FD_ZERO(&readers); |
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383 FD_SET(s->sock_fd, &readers); |
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384 n = select(s->sock_fd+1, &readers, (fd_set *)0, (fd_set *)0, &timeout); |
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385 if (n < 0) |
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386 return socket_error(); |
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387 return newintobject((long) (n != 0)); |
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388 } |
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389 |
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390 |
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391 /* s.bind(sockaddr) method */ |
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392 |
| 294 | 393 static object * |
| 394 sock_bind(s, args) | |
| 395 sockobject *s; | |
| 396 object *args; | |
| 397 { | |
| 398 struct sockaddr *addr; | |
| 399 int addrlen; | |
| 400 if (!getsockaddrarg(s, args, &addr, &addrlen)) | |
| 401 return NULL; | |
| 402 if (bind(s->sock_fd, addr, addrlen) < 0) | |
| 403 return socket_error(); | |
| 404 INCREF(None); | |
| 405 return None; | |
| 406 } | |
| 407 | |
|
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408 |
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409 /* s.close() method. |
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410 Set the file descriptor to -1 so operations tried subsequently |
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411 will surely fail. */ |
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412 |
| 294 | 413 static object * |
| 414 sock_close(s, args) | |
| 415 sockobject *s; | |
| 416 object *args; | |
| 417 { | |
| 418 if (!getnoarg(args)) | |
| 419 return NULL; | |
| 420 (void) close(s->sock_fd); | |
| 421 s->sock_fd = -1; | |
| 422 INCREF(None); | |
| 423 return None; | |
| 424 } | |
| 425 | |
|
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426 |
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427 /* s.connect(sockaddr) method */ |
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428 |
| 294 | 429 static object * |
| 430 sock_connect(s, args) | |
| 431 sockobject *s; | |
| 432 object *args; | |
| 433 { | |
| 434 struct sockaddr *addr; | |
| 435 int addrlen; | |
| 436 if (!getsockaddrarg(s, args, &addr, &addrlen)) | |
| 437 return NULL; | |
| 438 if (connect(s->sock_fd, addr, addrlen) < 0) | |
| 439 return socket_error(); | |
| 440 INCREF(None); | |
| 441 return None; | |
| 442 } | |
| 443 | |
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444 |
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445 /* s.listen(n) method */ |
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446 |
| 294 | 447 static object * |
| 448 sock_listen(s, args) | |
| 449 sockobject *s; | |
| 450 object *args; | |
| 451 { | |
| 452 int backlog; | |
| 453 if (!getintarg(args, &backlog)) | |
| 454 return NULL; | |
| 455 if (listen(s->sock_fd, backlog) < 0) | |
| 456 return socket_error(); | |
| 457 INCREF(None); | |
| 458 return None; | |
| 459 } | |
| 460 | |
|
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461 |
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462 /* s.makefile(mode) method. |
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463 Create a new open file object referring to a dupped version of |
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464 the socket's file descriptor. (The dup() call is necessary so |
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465 that the open file and socket objects may be closed independent |
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466 of each other.) |
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467 The mode argument specifies 'r' or 'w' passed to fdopen(). */ |
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468 |
| 294 | 469 static object * |
|
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470 sock_makefile(s, args) |
| 294 | 471 sockobject *s; |
| 472 object *args; | |
| 473 { | |
|
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474 extern int fclose PROTO((FILE *)); |
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475 object *mode; |
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476 int fd; |
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477 FILE *fp; |
|
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478 if (!getStrarg(args, &mode)) |
|
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479 return NULL; |
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480 if ((fd = dup(s->sock_fd)) < 0 || |
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481 (fp = fdopen(fd, getstringvalue(mode))) == NULL) |
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482 return socket_error(); |
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483 return newopenfileobject(fp, "<socket>", getstringvalue(mode), fclose); |
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484 } |
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485 |
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486 |
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487 /* s.recv(nbytes) method */ |
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488 |
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489 static object * |
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490 sock_recv(s, args) |
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491 sockobject *s; |
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492 object *args; |
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493 { |
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494 int len, n, flags; |
| 294 | 495 object *buf; |
|
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496 if (!getintintarg(args, &len, &flags)) { |
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497 err_clear(); |
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498 if (!getintarg(args, &len)) |
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499 return NULL; |
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500 flags = 0; |
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501 } |
| 294 | 502 buf = newsizedstringobject((char *) 0, len); |
| 503 if (buf == NULL) | |
| 504 return NULL; | |
|
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505 n = recv(s->sock_fd, getstringvalue(buf), len, flags); |
| 294 | 506 if (n < 0) |
| 507 return socket_error(); | |
| 508 if (resizestring(&buf, n) < 0) | |
| 509 return NULL; | |
| 510 return buf; | |
| 511 } | |
| 512 | |
|
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513 |
|
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514 /* s.recvfrom(nbytes) method */ |
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515 |
| 294 | 516 static object * |
| 517 sock_recvfrom(s, args) | |
| 518 sockobject *s; | |
| 519 object *args; | |
| 520 { | |
| 521 char addrbuf[256]; | |
| 522 object *buf; | |
| 523 int addrlen, len, n; | |
| 524 if (!getintarg(args, &len)) | |
| 525 return NULL; | |
| 526 buf = newsizedstringobject((char *) 0, len); | |
| 527 addrlen = sizeof addrbuf; | |
| 528 n = recvfrom(s->sock_fd, getstringvalue(buf), len, 0, | |
| 529 addrbuf, &addrlen); | |
| 530 if (n < 0) | |
| 531 return socket_error(); | |
| 532 if (resizestring(&buf, n) < 0) | |
| 533 return NULL; | |
| 729 | 534 return makepair(buf, |
| 535 makesockaddr((struct sockaddr *)addrbuf, addrlen)); | |
| 294 | 536 } |
| 537 | |
|
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538 |
|
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539 /* s.send(data) method */ |
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540 |
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541 static object * |
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542 sock_send(s, args) |
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543 sockobject *s; |
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544 object *args; |
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545 { |
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546 object *buf; |
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547 int len, n, flags; |
|
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548 if (!getStrintarg(args, &buf, &flags)) { |
|
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549 err_clear(); |
|
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550 if (!getStrarg(args, &buf)) |
|
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551 return NULL; |
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552 flags = 0; |
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553 } |
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554 len = getstringsize(buf); |
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555 n = send(s->sock_fd, getstringvalue(buf), len, flags); |
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556 if (n < 0) |
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557 return socket_error(); |
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558 INCREF(None); |
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559 return None; |
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560 } |
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561 |
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562 |
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563 /* s.sendto(data, sockaddr) method */ |
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|
564 |
| 294 | 565 static object * |
| 566 sock_sendto(s, args) | |
| 567 sockobject *s; | |
| 568 object *args; | |
| 569 { | |
| 570 object *buf; | |
| 571 struct sockaddr *addr; | |
| 572 int addrlen, len, n; | |
| 573 if (args == NULL || !is_tupleobject(args) || gettuplesize(args) != 2) { | |
| 574 err_badarg(); | |
| 575 return NULL; | |
| 576 } | |
|
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577 if (!getStrarg(gettupleitem(args, 0), &buf) || |
| 294 | 578 !getsockaddrarg(s, gettupleitem(args, 1), &addr, &addrlen)) |
| 579 return NULL; | |
| 580 len = getstringsize(buf); | |
| 581 n = sendto(s->sock_fd, getstringvalue(buf), len, 0, | |
| 582 addr, addrlen); | |
| 583 if (n < 0) | |
| 584 return socket_error(); | |
|
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585 INCREF(None); |
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586 return None; |
| 294 | 587 } |
| 588 | |
|
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589 |
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590 /* s.shutdown(how) method */ |
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591 |
| 294 | 592 static object * |
| 593 sock_shutdown(s, args) | |
| 594 sockobject *s; | |
| 595 object *args; | |
| 596 { | |
| 597 int how; | |
| 598 if (!getintarg(args, &how)) | |
| 599 return NULL; | |
| 600 if (shutdown(s->sock_fd, how) < 0) | |
| 601 return socket_error(); | |
| 602 INCREF(None); | |
| 603 return None; | |
| 604 } | |
| 605 | |
|
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606 |
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|
607 /* List of methods for socket objects */ |
| 294 | 608 |
| 609 static struct methodlist sock_methods[] = { | |
| 610 {"accept", sock_accept}, | |
|
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Add gethostname() and s.avail().
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|
611 {"avail", sock_avail}, |
| 396 | 612 {"allowbroadcast", sock_allowbroadcast}, |
| 294 | 613 {"bind", sock_bind}, |
| 614 {"close", sock_close}, | |
| 615 {"connect", sock_connect}, | |
| 616 {"listen", sock_listen}, | |
|
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617 {"makefile", sock_makefile}, |
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618 {"recv", sock_recv}, |
| 294 | 619 {"recvfrom", sock_recvfrom}, |
|
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620 {"send", sock_send}, |
| 294 | 621 {"sendto", sock_sendto}, |
| 622 {"shutdown", sock_shutdown}, | |
| 623 {NULL, NULL} /* sentinel */ | |
| 624 }; | |
| 625 | |
|
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626 |
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627 /* Deallocate a socket object in response to the last DECREF(). |
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628 First close the file description. */ |
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|
629 |
| 294 | 630 static void |
| 631 sock_dealloc(s) | |
| 632 sockobject *s; | |
| 633 { | |
| 634 (void) close(s->sock_fd); | |
| 635 DEL(s); | |
| 636 } | |
| 637 | |
|
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638 |
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639 /* Return a socket object's named attribute. */ |
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|
640 |
| 294 | 641 static object * |
| 642 sock_getattr(s, name) | |
| 643 sockobject *s; | |
| 644 char *name; | |
| 645 { | |
| 646 return findmethod(sock_methods, (object *) s, name); | |
| 647 } | |
| 648 | |
|
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649 |
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|
650 /* Type object for socket objects. |
|
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Make Socktype global so old and new compilers will like it.
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|
651 XXX This should be static, but some compilers don't grok the |
|
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652 XXX forward reference to it in that case... */ |
|
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653 |
|
374
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654 typeobject Socktype = { |
| 294 | 655 OB_HEAD_INIT(&Typetype) |
| 656 0, | |
| 657 "socket", | |
| 658 sizeof(sockobject), | |
| 659 0, | |
| 660 sock_dealloc, /*tp_dealloc*/ | |
| 661 0, /*tp_print*/ | |
| 662 sock_getattr, /*tp_getattr*/ | |
| 663 0, /*tp_setattr*/ | |
| 664 0, /*tp_compare*/ | |
| 665 0, /*tp_repr*/ | |
| 666 0, /*tp_as_number*/ | |
| 667 0, /*tp_as_sequence*/ | |
| 668 0, /*tp_as_mapping*/ | |
| 669 }; | |
| 670 | |
|
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671 |
|
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672 /* Python interface to gethostname(). */ |
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673 |
|
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674 /*ARGSUSED*/ |
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Add gethostname() and s.avail().
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675 static object * |
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676 socket_gethostname(self, args) |
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677 object *self; |
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678 object *args; |
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Add gethostname() and s.avail().
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679 { |
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|
680 char buf[1024]; |
|
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681 if (!getnoarg(args)) |
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682 return NULL; |
| 729 | 683 if (gethostname(buf, (int) sizeof buf - 1) < 0) |
|
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684 return socket_error(); |
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|
685 buf[sizeof buf - 1] = '\0'; |
|
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686 return newstringobject(buf); |
|
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|
687 } |
|
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|
688 /* Python interface to gethostbyname(name). */ |
|
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689 |
|
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690 /*ARGSUSED*/ |
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diff
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691 static object * |
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|
692 socket_gethostbyname(self, args) |
|
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693 object *self; |
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694 object *args; |
|
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|
695 { |
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|
696 object *name; |
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|
697 struct sockaddr_in addrbuf; |
|
641
b162b27400bc
Cal get*Str*arg() instead of get*str*arg(), until the code is fixed.
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diff
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|
698 if (!getStrarg(args, &name)) |
|
295
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|
699 return NULL; |
|
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|
700 if (setipaddr(getstringvalue(name), &addrbuf) < 0) |
|
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|
701 return NULL; |
|
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|
702 return makeipaddr(&addrbuf); |
|
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diff
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|
703 } |
|
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diff
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|
704 |
|
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294
diff
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|
705 |
|
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294
diff
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|
706 /* Python interface to getservbyname(name). |
|
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294
diff
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|
707 This only returns the port number, since the other info is already |
|
d7a38dece86a
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|
708 known or not useful (like the list of aliases). */ |
|
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294
diff
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|
709 |
|
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diff
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|
710 /*ARGSUSED*/ |
|
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diff
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|
711 static object * |
|
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|
712 socket_getservbyname(self, args) |
|
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|
713 object *self; |
|
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diff
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|
714 object *args; |
|
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parents:
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diff
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|
715 { |
|
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diff
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|
716 object *name, *proto; |
|
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|
717 struct servent *sp; |
|
641
b162b27400bc
Cal get*Str*arg() instead of get*str*arg(), until the code is fixed.
Guido van Rossum <guido@python.org>
parents:
454
diff
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|
718 if (!getStrStrarg(args, &name, &proto)) |
|
295
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|
719 return NULL; |
|
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diff
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|
720 sp = getservbyname(getstringvalue(name), getstringvalue(proto)); |
|
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diff
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|
721 if (sp == NULL) { |
|
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diff
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|
722 err_setstr(SocketError, "service/proto not found"); |
|
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|
723 return NULL; |
|
d7a38dece86a
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|
724 } |
|
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294
diff
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|
725 return newintobject((long) ntohs(sp->s_port)); |
|
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diff
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|
726 } |
|
d7a38dece86a
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diff
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|
727 |
|
d7a38dece86a
Many changes to the interface, and added comments.
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|
728 |
|
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Guido van Rossum <guido@python.org>
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294
diff
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|
729 /* Python interface to socket(family, type, proto). |
|
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diff
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|
730 The third (protocol) argument is optional. |
|
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|
731 Return a new socket object. */ |
|
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|
732 |
| 294 | 733 /*ARGSUSED*/ |
| 734 static object * | |
| 735 socket_socket(self, args) | |
| 736 object *self; | |
| 737 object *args; | |
| 738 { | |
| 739 sockobject *s; | |
| 740 int family, type, proto, fd; | |
|
295
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|
741 if (args != NULL && is_tupleobject(args) && gettuplesize(args) == 3) { |
|
309
382323f92fce
Connection sockets now have the proper family/type/proto values.
Guido van Rossum <guido@python.org>
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|
742 if (!getintintintarg(args, &family, &type, &proto)) |
|
295
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|
743 return NULL; |
|
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|
744 } |
|
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parents:
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|
745 else { |
|
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diff
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|
746 if (!getintintarg(args, &family, &type)) |
|
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|
747 return NULL; |
|
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|
748 proto = 0; |
|
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|
749 } |
| 294 | 750 fd = socket(family, type, proto); |
| 751 if (fd < 0) | |
| 752 return socket_error(); | |
| 753 s = newsockobject(fd, family, type, proto); | |
|
295
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diff
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|
754 /* If the object can't be created, don't forget to close the |
|
d7a38dece86a
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Guido van Rossum <guido@python.org>
parents:
294
diff
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|
755 file descriptor again! */ |
| 294 | 756 if (s == NULL) |
|
295
d7a38dece86a
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diff
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|
757 (void) close(fd); |
|
324
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Add gethostname() and s.avail().
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309
diff
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|
758 /* From now on, ignore SIGPIPE and let the error checking |
|
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Add gethostname() and s.avail().
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diff
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|
759 do the work. */ |
|
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Add gethostname() and s.avail().
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diff
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|
760 (void) signal(SIGPIPE, SIG_IGN); |
| 294 | 761 return (object *) s; |
| 762 } | |
| 763 | |
|
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diff
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|
764 |
|
d7a38dece86a
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294
diff
changeset
|
765 /* List of functions exported by this module. */ |
|
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diff
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|
766 |
| 294 | 767 static struct methodlist socket_methods[] = { |
|
295
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diff
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|
768 {"gethostbyname", socket_gethostbyname}, |
|
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Add gethostname() and s.avail().
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|
769 {"gethostname", socket_gethostname}, |
|
295
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294
diff
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|
770 {"getservbyname", socket_getservbyname}, |
|
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Many changes to the interface, and added comments.
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|
771 {"socket", socket_socket}, |
|
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diff
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|
772 {NULL, NULL} /* Sentinel */ |
| 294 | 773 }; |
| 774 | |
|
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diff
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|
775 |
|
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changeset
|
776 /* Convenience routine to export an integer value. |
|
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|
777 For simplicity, errors (which are unlikely anyway) are ignored. */ |
|
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|
778 |
| 294 | 779 static void |
| 780 insint(d, name, value) | |
| 781 object *d; | |
| 782 char *name; | |
| 783 int value; | |
| 784 { | |
| 785 object *v = newintobject((long) value); | |
| 786 if (v == NULL) { | |
| 787 /* Don't bother reporting this error */ | |
| 788 err_clear(); | |
| 789 } | |
| 790 else { | |
| 791 dictinsert(d, name, v); | |
| 792 DECREF(v); | |
| 793 } | |
| 794 } | |
| 795 | |
|
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|
796 |
|
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diff
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|
797 /* Initialize this module. |
|
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|
798 This is called when the first 'import socket' is done, |
|
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|
799 via a table in config.c, if config.c is compiled with USE_SOCKET |
|
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diff
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|
800 defined. */ |
|
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diff
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|
801 |
| 294 | 802 void |
| 803 initsocket() | |
| 804 { | |
| 805 object *m, *d; | |
| 806 | |
| 807 m = initmodule("socket", socket_methods); | |
| 808 d = getmoduledict(m); | |
| 809 SocketError = newstringobject("socket.error"); | |
| 810 if (SocketError == NULL || dictinsert(d, "error", SocketError) != 0) | |
| 811 fatal("can't define socket.error"); | |
| 812 insint(d, "AF_INET", AF_INET); | |
| 813 insint(d, "AF_UNIX", AF_UNIX); | |
| 814 insint(d, "SOCK_STREAM", SOCK_STREAM); | |
| 815 insint(d, "SOCK_DGRAM", SOCK_DGRAM); | |
| 816 insint(d, "SOCK_RAW", SOCK_RAW); | |
| 817 insint(d, "SOCK_SEQPACKET", SOCK_SEQPACKET); | |
| 818 insint(d, "SOCK_RDM", SOCK_RDM); | |
| 819 } |