triggerhappy/cmdsocket.c at master · maffe/triggerhappy · GitHub

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/* Copyright 2010 Stefan Tomanek <stefan.tomanek+th@wertarbyte.de>
 * You have permission to copy, modify, and redistribute under the
 * terms of the GPLv3 or any later version.
 * For full license terms, see COPYING.
 */

#include<stdio.h>
#include<stdlib.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<sys/un.h>
#include<string.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>

#ifdefHAVE_SYSTEMD
#include<systemd/sd-daemon.h>
#endif

#include"devtag.h"
#include"devices.h"
#include"command.h"
#include"cmdsocket.h"

intbind_cmdsocket( char*name ) {
intcmd_fd;

#ifdefHAVE_SYSTEMD
if (sd_listen_fds(0) ==1) {
fprintf(stderr, SD_DEBUG"Found socket passed from systemd\n");
returnSD_LISTEN_FDS_START+0;
	}
#endif

structsockaddr_unaddr;
/* remove any stale files */
structstatsb;
intserr=stat(name, &sb);
if ( !serr&&S_ISSOCK(sb.st_mode)) {
unlink(name);
	}
cmd_fd=socket(AF_UNIX, SOCK_DGRAM, 0);
strcpy(addr.sun_path, name);
addr.sun_family=AF_UNIX;
bind (cmd_fd, (structsockaddr*) &addr,
strlen(addr.sun_path) +sizeof (addr.sun_family));
returncmd_fd;
}

intconnect_cmdsocket( char*name ) {
intfd;
structsockaddr_unserver;
fd=socket(AF_UNIX, SOCK_DGRAM, 0);
strcpy(server.sun_path, name);
server.sun_family=AF_UNIX;
connect(fd, (structsockaddr*) &server,
strlen(server.sun_path) +sizeof (server.sun_family));
returnfd;
}

structcommand*read_command( intcmd_fd ) {
structcommand*cmd=malloc(sizeof(structcommand));
if (! cmd) {
fprintf(stderr, "Unable to allocate memory for command!\n");
returnNULL;
	}

intfd[1] = {-1};
charbuffer[CMSG_SPACE(sizeoffd)];

structiovecv= {
 .iov_base=cmd,
 .iov_len=sizeof(*cmd)
	};
structmsghdrmsg= {
 .msg_iov=&v,
 .msg_iovlen=1,
 .msg_control=buffer,
 .msg_controllen=sizeof(buffer)
	};

intdone=recvmsg( cmd_fd, &msg, 0 );

if (done==-1) {
fprintf(stderr, "Error reading command.");
free(cmd);
returnNULL;
	}
structcmsghdr*cmessage=CMSG_FIRSTHDR(&msg);
if (cmessage) {
memcpy(fd, CMSG_DATA(cmessage), sizeoffd);
/* place FD back in the command message */
cmd->fd= (int) fd[0];
	}
returncmd;
}

intsend_command( intcmd_fd, enumcommand_typetype, char*param, intpassfd, intexclusive, char*tag ) {
if (type==CMD_ADD&&passfd==1) {
type=CMD_PASSFD;
	}
structcommandcmd= {
 .fd=-1,
 .exclusive=exclusive,
 .type=type,
 .param= {0},
 .tag= {0}
	};
if (param!=NULL) {
strncpy(cmd.param, param, TH_COMMAND_PARAM_LENGTH);
cmd.param[TH_COMMAND_PARAM_LENGTH-1] ='\0';
	}
if (tag!=NULL) {
strncpy(cmd.tag, tag, TH_DEVICE_TAG_LENGTH);
cmd.tag[TH_DEVICE_TAG_LENGTH-1] ='\0';
	}

structiovecv= {
 .iov_base=&cmd,
 .iov_len=sizeof(cmd)
	};
structmsghdrm= {
 .msg_iov=&v,
 .msg_iovlen=1
	};

/* add FD */
intdev_fd[1] = { -1 };
charbuffer[CMSG_SPACE(sizeof(dev_fd))];
if (passfd) {
intfd=open( param, O_RDONLY );
if (fd<0) {
perror("open");
return1;
 }
dev_fd[0] =fd ;
m.msg_control=buffer;
m.msg_controllen=sizeof(buffer);

structcmsghdr*cmessage=CMSG_FIRSTHDR(&m);
cmessage->cmsg_level=SOL_SOCKET;
cmessage->cmsg_type=SCM_RIGHTS;
cmessage->cmsg_len=CMSG_LEN(sizeof(dev_fd));

m.msg_controllen=cmessage->cmsg_len;
memcpy(CMSG_DATA(cmessage), dev_fd, sizeofdev_fd);
	}
intdone=sendmsg( cmd_fd, &m, 0 );
return (done==-1);
}