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96336324cf
- Minor configuration related changes.
211 lines
5.6 KiB
C
211 lines
5.6 KiB
C
/*
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* Server-side socket communication functions
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*
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* Copyright (C) 1998 Alexandre Julliard
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*/
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#include "config.h"
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#endif
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#include <sys/uio.h>
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#include <unistd.h>
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#include "config.h"
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#include "object.h"
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#include "request.h"
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/* Some versions of glibc don't define this */
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#ifndef SCM_RIGHTS
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#define SCM_RIGHTS 1
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#endif
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/* client structure */
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struct client
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{
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struct select_user select; /* select user */
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unsigned int res; /* current result to send */
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int pass_fd; /* fd to pass to and from the client */
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struct thread *self; /* client thread (opaque pointer) */
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struct timeout_user *timeout; /* current timeout (opaque pointer) */
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};
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/* socket communication static structures */
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static struct iovec myiovec;
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static struct msghdr msghdr = { NULL, 0, &myiovec, 1, };
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#ifndef HAVE_MSGHDR_ACCRIGHTS
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struct cmsg_fd
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{
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int len; /* sizeof structure */
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int level; /* SOL_SOCKET */
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int type; /* SCM_RIGHTS */
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int fd; /* fd to pass */
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};
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static struct cmsg_fd cmsg = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, -1 };
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#endif /* HAVE_MSGHDR_ACCRIGHTS */
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/* send a message to a client that is ready to receive something */
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static int do_write( struct client *client )
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{
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int ret;
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if (client->pass_fd == -1)
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{
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ret = write( client->select.fd, &client->res, sizeof(client->res) );
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if (ret == sizeof(client->res)) goto ok;
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}
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else /* we have an fd to send */
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{
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#ifdef HAVE_MSGHDR_ACCRIGHTS
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msghdr.msg_accrightslen = sizeof(int);
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msghdr.msg_accrights = (void *)&client->pass_fd;
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#else /* HAVE_MSGHDR_ACCRIGHTS */
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msghdr.msg_control = &cmsg;
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msghdr.msg_controllen = sizeof(cmsg);
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cmsg.fd = client->pass_fd;
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#endif /* HAVE_MSGHDR_ACCRIGHTS */
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myiovec.iov_base = (void *)&client->res;
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myiovec.iov_len = sizeof(client->res);
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ret = sendmsg( client->select.fd, &msghdr, 0 );
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close( client->pass_fd );
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client->pass_fd = -1;
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if (ret == sizeof(client->res)) goto ok;
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}
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if (ret == -1)
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{
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if (errno == EWOULDBLOCK) return 0; /* not a fatal error */
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if (errno != EPIPE) perror("sendmsg");
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}
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else fprintf( stderr, "Partial message sent %d/%d\n", ret, sizeof(client->res) );
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remove_client( client, BROKEN_PIPE );
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return 0;
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ok:
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set_select_events( &client->select, READ_EVENT );
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return 1;
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}
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/* read a message from a client that has something to say */
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static void do_read( struct client *client )
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{
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int ret;
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enum request req;
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#ifdef HAVE_MSGHDR_ACCRIGHTS
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msghdr.msg_accrightslen = sizeof(int);
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msghdr.msg_accrights = (void *)&client->pass_fd;
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#else /* HAVE_MSGHDR_ACCRIGHTS */
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msghdr.msg_control = &cmsg;
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msghdr.msg_controllen = sizeof(cmsg);
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cmsg.fd = -1;
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#endif /* HAVE_MSGHDR_ACCRIGHTS */
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assert( client->pass_fd == -1 );
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myiovec.iov_base = (void *)&req;
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myiovec.iov_len = sizeof(req);
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ret = recvmsg( client->select.fd, &msghdr, 0 );
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#ifndef HAVE_MSGHDR_ACCRIGHTS
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client->pass_fd = cmsg.fd;
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#endif
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if (ret == sizeof(req))
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{
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int pass_fd = client->pass_fd;
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client->pass_fd = -1;
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call_req_handler( client->self, req, pass_fd );
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if (pass_fd != -1) close( pass_fd );
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return;
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}
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if (ret == -1)
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{
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perror("recvmsg");
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remove_client( client, BROKEN_PIPE );
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return;
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}
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if (!ret) /* closed pipe */
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{
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remove_client( client, BROKEN_PIPE );
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return;
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}
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fatal_protocol_error( client->self, "partial message received %d/%d\n", ret, sizeof(req) );
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}
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/* handle a client event */
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static void client_event( int event, void *private )
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{
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struct client *client = (struct client *)private;
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if (event & WRITE_EVENT) do_write( client );
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if (event & READ_EVENT) do_read( client );
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}
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/*******************************************************************/
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/* server-side exported functions */
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/* add a client */
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struct client *add_client( int fd, struct thread *self )
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{
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int flags;
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struct client *client = mem_alloc( sizeof(*client) );
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if (!client) return NULL;
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flags = fcntl( fd, F_GETFL, 0 );
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fcntl( fd, F_SETFL, flags | O_NONBLOCK );
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client->select.fd = fd;
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client->select.func = client_event;
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client->select.private = client;
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client->self = self;
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client->timeout = NULL;
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client->pass_fd = -1;
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register_select_user( &client->select );
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set_select_events( &client->select, READ_EVENT );
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return client;
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}
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/* remove a client */
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void remove_client( struct client *client, int exit_code )
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{
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assert( client );
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call_kill_handler( client->self, exit_code );
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if (client->timeout) remove_timeout_user( client->timeout );
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unregister_select_user( &client->select );
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close( client->select.fd );
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/* Purge messages */
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if (client->pass_fd != -1) close( client->pass_fd );
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free( client );
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}
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/* set the fd to pass to the client */
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void client_pass_fd( struct client *client, int pass_fd )
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{
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assert( client->pass_fd == -1 );
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client->pass_fd = pass_fd;
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}
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/* send a reply to a client */
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void client_reply( struct client *client, unsigned int res )
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{
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if (debug_level) trace_reply( client->self, res, client->pass_fd );
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client->res = res;
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if (!do_write( client )) set_select_events( &client->select, WRITE_EVENT );
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}
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