]>
git.ipfire.org Git - thirdparty/squid.git/blob - src/ipc.cc
2 * DEBUG: section 54 Interprocess Communication
3 * AUTHOR: Duane Wessels
5 * SQUID Web Proxy Cache http://www.squid-cache.org/
6 * ----------------------------------------------------------
8 * Squid is the result of efforts by numerous individuals from
9 * the Internet community; see the CONTRIBUTORS file for full
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17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
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29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
36 #include "ip/Address.h"
39 static const char *hello_string
= "hi there\n";
40 #define HELLO_BUF_SZ 32
41 static char hello_buf
[HELLO_BUF_SZ
];
44 ipcCloseAllFD(int prfd
, int pwfd
, int crfd
, int cwfd
)
69 env_str
= (char *)xcalloc((tmp_s
= strlen(Debug::debugOptions
) + 32), 1);
70 snprintf(env_str
, tmp_s
, "SQUID_DEBUG=%s", Debug::debugOptions
);
76 ipcCreate(int type
, const char *prog
, const char *const args
[], const char *name
, Ip::Address
&local_addr
, int *rfd
, int *wfd
, void **hIpc
)
81 struct addrinfo
*AI
= NULL
;
90 #if USE_POLL && defined(_SQUID_OSF_)
92 assert(type
!= IPC_FIFO
);
104 if (type
== IPC_TCP_SOCKET
) {
105 crfd
= cwfd
= comm_open(SOCK_STREAM
,
110 prfd
= pwfd
= comm_open(SOCK_STREAM
,
115 } else if (type
== IPC_UDP_SOCKET
) {
116 crfd
= cwfd
= comm_open(SOCK_DGRAM
,
121 prfd
= pwfd
= comm_open(SOCK_DGRAM
,
126 } else if (type
== IPC_FIFO
) {
131 debugs(54, 0, "ipcCreate: pipe: " << xstrerror());
136 debugs(54, 0, "ipcCreate: pipe: " << xstrerror());
140 fd_open(prfd
= p2c
[0], FD_PIPE
, "IPC FIFO Parent Read");
141 fd_open(cwfd
= p2c
[1], FD_PIPE
, "IPC FIFO Child Write");
142 fd_open(crfd
= c2p
[0], FD_PIPE
, "IPC FIFO Child Read");
143 fd_open(pwfd
= c2p
[1], FD_PIPE
, "IPC FIFO Parent Write");
144 #if HAVE_SOCKETPAIR && defined(AF_UNIX)
146 } else if (type
== IPC_UNIX_STREAM
) {
150 if (socketpair(AF_UNIX
, SOCK_STREAM
, 0, fds
) < 0) {
151 debugs(54, 0, "ipcCreate: socketpair: " << xstrerror());
155 setsockopt(fds
[0], SOL_SOCKET
, SO_SNDBUF
, (void *) &buflen
, sizeof(buflen
));
156 setsockopt(fds
[0], SOL_SOCKET
, SO_RCVBUF
, (void *) &buflen
, sizeof(buflen
));
157 setsockopt(fds
[1], SOL_SOCKET
, SO_SNDBUF
, (void *) &buflen
, sizeof(buflen
));
158 setsockopt(fds
[1], SOL_SOCKET
, SO_RCVBUF
, (void *) &buflen
, sizeof(buflen
));
159 fd_open(prfd
= pwfd
= fds
[0], FD_PIPE
, "IPC UNIX STREAM Parent");
160 fd_open(crfd
= cwfd
= fds
[1], FD_PIPE
, "IPC UNIX STREAM Parent");
161 } else if (type
== IPC_UNIX_DGRAM
) {
164 if (socketpair(AF_UNIX
, SOCK_DGRAM
, 0, fds
) < 0) {
165 debugs(54, 0, "ipcCreate: socketpair: " << xstrerror());
169 fd_open(prfd
= pwfd
= fds
[0], FD_PIPE
, "IPC UNIX DGRAM Parent");
170 fd_open(crfd
= cwfd
= fds
[1], FD_PIPE
, "IPC UNIX DGRAM Parent");
177 debugs(54, 3, "ipcCreate: prfd FD " << prfd
);
178 debugs(54, 3, "ipcCreate: pwfd FD " << pwfd
);
179 debugs(54, 3, "ipcCreate: crfd FD " << crfd
);
180 debugs(54, 3, "ipcCreate: cwfd FD " << cwfd
);
183 debugs(54, 0, "ipcCreate: Failed to create child FD.");
184 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
188 debugs(54, 0, "ipcCreate: Failed to create server FD.");
189 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
192 if (type
== IPC_TCP_SOCKET
|| type
== IPC_UDP_SOCKET
) {
193 PaS
.InitAddrInfo(AI
);
195 if (getsockname(pwfd
, AI
->ai_addr
, &AI
->ai_addrlen
) < 0) {
196 PaS
.FreeAddrInfo(AI
);
197 debugs(54, 0, "ipcCreate: getsockname: " << xstrerror());
198 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
203 debugs(54, 3, "ipcCreate: FD " << pwfd
<< " sockaddr " << PaS
);
205 PaS
.FreeAddrInfo(AI
);
207 ChS
.InitAddrInfo(AI
);
209 if (getsockname(crfd
, AI
->ai_addr
, &AI
->ai_addrlen
) < 0) {
210 ChS
.FreeAddrInfo(AI
);
211 debugs(54, 0, "ipcCreate: getsockname: " << xstrerror());
212 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
217 ChS
.FreeAddrInfo(AI
);
219 debugs(54, 3, "ipcCreate: FD " << crfd
<< " sockaddr " << ChS
);
223 if (type
== IPC_TCP_SOCKET
) {
224 if (listen(crfd
, 1) < 0) {
225 debugs(54, 1, "ipcCreate: listen FD " << crfd
<< ": " << xstrerror());
226 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
229 debugs(54, 3, "ipcCreate: FD " << crfd
<< " listening...");
232 /* flush or else we get dup data if unbuffered_logs is set */
235 if ((pid
= fork()) < 0) {
236 debugs(54, 1, "ipcCreate: fork: " << xstrerror());
237 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
240 if (pid
> 0) { /* parent */
241 /* close shared socket with child */
249 if (type
== IPC_TCP_SOCKET
|| type
== IPC_UDP_SOCKET
) {
250 if (comm_connect_addr(pwfd
, ChS
) == COMM_ERROR
)
251 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
254 memset(hello_buf
, '\0', HELLO_BUF_SZ
);
256 if (type
== IPC_UDP_SOCKET
)
257 x
= comm_udp_recv(prfd
, hello_buf
, HELLO_BUF_SZ
- 1, 0);
259 x
= read(prfd
, hello_buf
, HELLO_BUF_SZ
- 1);
262 debugs(54, 0, "ipcCreate: PARENT: hello read test failed");
263 debugs(54, 0, "--> read: " << xstrerror());
264 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
265 } else if (strcmp(hello_buf
, hello_string
)) {
266 debugs(54, 0, "ipcCreate: PARENT: hello read test failed");
267 debugs(54, 0, "--> read returned " << x
);
268 debugs(54, 0, "--> got '" << rfc1738_escape(hello_buf
) << "'");
269 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
272 commSetTimeout(prfd
, -1, NULL
, NULL
);
273 commSetNonBlocking(prfd
);
274 commSetNonBlocking(pwfd
);
282 fd_table
[prfd
].flags
.ipc
= 1;
284 fd_table
[pwfd
].flags
.ipc
= 1;
286 if (Config
.sleep_after_fork
) {
287 /* XXX emulation of usleep() */
290 sl
.tv_sec
= Config
.sleep_after_fork
/ 1000000;
291 sl
.tv_usec
= Config
.sleep_after_fork
% 1000000;
292 select(0, NULL
, NULL
, NULL
, &sl
);
299 no_suid(); /* give up extra priviliges */
301 /* close shared socket with parent */
309 if (type
== IPC_TCP_SOCKET
) {
310 debugs(54, 3, "ipcCreate: calling accept on FD " << crfd
);
312 if ((fd
= accept(crfd
, NULL
, NULL
)) < 0) {
313 debugs(54, 0, "ipcCreate: FD " << crfd
<< " accept: " << xstrerror());
317 debugs(54, 3, "ipcCreate: CHILD accepted new FD " << fd
);
320 } else if (type
== IPC_UDP_SOCKET
) {
321 if (comm_connect_addr(crfd
, PaS
) == COMM_ERROR
)
322 return ipcCloseAllFD(prfd
, pwfd
, crfd
, cwfd
);
325 if (type
== IPC_UDP_SOCKET
) {
326 x
= comm_udp_send(cwfd
, hello_string
, strlen(hello_string
) + 1, 0);
329 debugs(54, 0, "sendto FD " << cwfd
<< ": " << xstrerror());
330 debugs(54, 0, "ipcCreate: CHILD: hello write test failed");
334 if (write(cwfd
, hello_string
, strlen(hello_string
) + 1) < 0) {
335 debugs(54, 0, "write FD " << cwfd
<< ": " << xstrerror());
336 debugs(54, 0, "ipcCreate: CHILD: hello write test failed");
343 * This double-dup stuff avoids problems when one of
344 * crfd, cwfd, or debug_log are in the rage 0-2.
348 /* First make sure 0-2 is occupied by something. Gets cleaned up later */
351 } while (x
< 3 && x
> -1);
359 t3
= dup(fileno(debug_log
));
361 assert(t1
> 2 && t2
> 2 && t3
> 2);
367 close(fileno(debug_log
));
381 /* Make sure all other filedescriptors are closed */
382 for (x
= 3; x
< SQUID_MAXFD
; x
++)
390 execvp(prog
, (char *const *) args
);
392 debug_log
= fdopen(2, "a+");
394 debugs(54, 0, "ipcCreate: " << prog
<< ": " << xstrerror());