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/* ========================================================================
* Copyright 2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
#define _GNU_SOURCE
#include <system.h>
#include <general.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include "id_table.h"
#include "wp_uidmapper_lib.h"
/* Makefile should #define:
*
* WP_UIDMAPPER_SOCKET
*/
unsigned long send_full(int fd,void *buf,unsigned long len,int flags) {
unsigned long total,i;
for(total = 0; total < len; total += i) {
i = send(fd,(char*)buf + total, len - total,flags);
if(i == -1) return -1;
}
return total;
}
static char *socketname = WP_UIDMAPPER_SOCKET;
static int socketname_remove = 0;
void socketname_cleanup(void) {
unlink(socketname);
}
void quit_handler(int signal) {
exit(signal);
}
int main(int argc, char *argv[]) {
extern char *optarg;
extern int optind, opterr, optopt;
int debug,log_opt;
mode_t sockmode;
id_table_range *range;
id_table table;
struct sockaddr_un sun,rsun;
struct sigaction sa;
int is_err,i,ssock,uid;
unsigned int kbuf[WP_KEY_LEN];
char rbuf[WP_BUF_SIZE],cbuf[WP_BUF_SIZE],rcmd;
struct msghdr rmh,smh;
struct iovec riov[3],siov[1];
#ifndef DGRAM_MODE
int csock,rsun_len;
#endif
struct ucred cred;
/*
* process command line arguments
*/
debug = 0;
log_opt = 0;
sockmode = 0600;
for(is_err = 0; !is_err && ((i = getopt(argc,argv,"dlrm:s:u:")) != -1); ) {
switch(i) {
case 'd': debug++; break;
case 'l': log_opt |= LOG_PERROR; break;
case 'm': sockmode = strtol(optarg,NULL,0); break;
case 'r': socketname_remove = 1; break;
case 's': socketname = optarg; break;
case 'u': umask(strtol(optarg,NULL,0)); break;
case '?': is_err = 1; break;
}
}
if((optind + 1) == argc) {
range = id_table_range_new(argv[optind]);
if(!range) is_err = 1;
} else {
is_err = 1;
}
if(is_err) {
fprintf(stderr,"Usage: uidmapper [-d] [-l] [-r] [-m mode] [-s socketname] [-u umask] uidranges\n");
exit(1);
}
/*
* main initialization
*/
openlog(argv[0],log_opt,LOG_MAIL);
if(id_table_init(&table,range)) {
syslog(LOG_ERR,"could not initialize tables: %s\n",strerror(errno));
exit(1);
}
id_table_range_delete(range);
sa.sa_handler = quit_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGHUP,&sa,0);
sigaction(SIGINT,&sa,0);
sigaction(SIGQUIT,&sa,0);
sigaction(SIGTERM,&sa,0);
if(socketname_remove)
socketname_cleanup();
/*
* open socket
*/
#ifdef DGRAM_MODE
ssock = socket(AF_UNIX,SOCK_DGRAM,0);
#else
ssock = socket(AF_UNIX,SOCK_STREAM,0);
#endif
if(ssock < 0) {
syslog(LOG_ERR,"%s: socket: %s\n",socketname,strerror(errno));
exit(1);
}
/* sun.sun_len = strlen(socketname) + 1; */
sun.sun_family = AF_UNIX;
strcpy(sun.sun_path,socketname);
if(bind(ssock,(struct sockaddr*)&sun,sizeof(sun))) {
syslog(LOG_ERR,"%s: bind: %s\n",socketname,strerror(errno));
exit(1);
}
atexit(socketname_cleanup);
fchmod(ssock,sockmode);
#ifndef DGRAM_MODE
if(listen(ssock,8)) {
syslog(LOG_ERR,"%s: listen: %s\n",socketname,strerror(errno));
exit(1);
}
#endif
#ifdef DGRAM_MODE
if(debug >= 1) syslog(LOG_INFO,"SOCK_DGRAM socket opened");
#else
if(debug >= 1) syslog(LOG_INFO,"SOCK_STREAM socket opened");
#endif
/*
* accept commands
*/
riov[0].iov_base = &rcmd;
riov[0].iov_len = 1;
riov[1].iov_base = kbuf;
riov[1].iov_len = WP_KEY_LEN * sizeof(unsigned int);
riov[2].iov_base = rbuf;
riov[2].iov_len = WP_BUF_SIZE - 1;
rmh.msg_name = &rsun;
rmh.msg_namelen = sizeof(rsun);
rmh.msg_iov = riov;
rmh.msg_iovlen = 3;
rmh.msg_control = cbuf;
rmh.msg_controllen = riov[0].iov_len + riov[1].iov_len + riov[2].iov_len;
rmh.msg_flags = 0;
/* siov[0].iov_base */
/* siov[0].iov_len */
smh.msg_name = NULL;
smh.msg_namelen = 0;
smh.msg_iov = siov;
/* smh.msg_iovlen */
smh.msg_control = NULL;
smh.msg_controllen = 0;
smh.msg_flags = 0;
#ifndef DGRAM_MODE
csock = -1;
#endif
while(1) {
#ifdef DGRAM_MODE
i = recvmsg(ssock,&rmh,0);
#else
if(csock >= 0) close(csock);
rsun.sun_family = AF_UNIX;
rsun_len = sizeof(rsun);
csock = accept(ssock,(struct sockaddr*)&rsun,&rsun_len);
if(csock == -1) {
syslog(LOG_ERR,"accept: %s\n",strerror(errno));
break;
}
if(debug >= 2) {
i = sizeof(cred);
if(getsockopt(csock,SOL_SOCKET,SO_PEERCRED,&cred,&i) == -1) {
syslog(LOG_INFO,"getsockopt(SO_PEERCRED) failed: %s",strerror(errno));
} else {
syslog(LOG_INFO,"connection from pid=%i uid=%i gid=%i\n",
cred.pid,cred.uid,cred.gid);
}
}
i = recvmsg(csock,&rmh,0);
#endif
if(i == -1) {
syslog(LOG_ERR,"recvmsg: %s\n",strerror(errno));
break;
}
if(debug >= 2)
syslog(LOG_INFO,"recvd datagram [size=%i] from %s [size=%i]\n",
i,rsun.sun_path,rmh.msg_namelen);
/* check that datagram is well formed */
if(i < 1) {
syslog(LOG_WARNING,"recv: recvd datagram that is too small\n");
continue;
}
i--;
#ifdef DGRAM_MODE
smh.msg_name = rmh.msg_name;
smh.msg_namelen = rmh.msg_namelen;
#endif
if(rcmd == 'u') {
if(!i) {
syslog(LOG_WARNING,"recv: recvd 'u' datagram with no payload\n");
continue;
}
rbuf[i - (WP_KEY_LEN * sizeof(unsigned int))] = 0;
uid = id_table_create_id(&table,rbuf,kbuf);
if(debug >= 1) syslog(LOG_INFO,"request uid(%s) = %i\n",rbuf,uid);
if(uid == -1) {
char sbuf[2 * WP_BUF_SIZE],*sep = strerror(errno);
sprintf(sbuf,"id_table_create_id(%s,[",rbuf);
for(i = 0; i < WP_KEY_LEN; i++)
sprintf(sbuf + strlen(sbuf), "%u,", kbuf[i]);
sprintf(sbuf + strlen(sbuf) - 1, "]): %s\n",sep);
syslog(LOG_ERR,sbuf);
/* break; hobble along rather than die */
}
siov[0].iov_base = &uid;
siov[0].iov_len = sizeof(uid);
smh.msg_iovlen = 1;
#ifdef DGRAM_MODE
if(sendmsg(ssock,&smh,0) == -1)
#else
if(sendmsg(csock,&smh,0) == -1)
#endif
syslog(LOG_WARNING,"sendmsg: %s\n",strerror(errno));
} else if(rcmd == 'n') {
if(i != sizeof(uid)) {
syslog(LOG_WARNING,"recv: recvd 'n' datagram with invalid payload\n");
continue;
}
memcpy(&uid,kbuf,sizeof(uid));
siov[0].iov_base = id_table_get_name(&table,uid);
if(debug >= 1)
syslog(LOG_INFO,"request name(%d) = %s\n",uid,siov[0].iov_base);
if(siov[0].iov_base) {
siov[0].iov_len = strlen(siov[0].iov_base);
smh.msg_iovlen = 1;
} else {
smh.msg_iovlen = 0;
}
#ifdef DGRAM_MODE
if(sendmsg(ssock,&smh,0) == -1)
#else
if(sendmsg(csock,&smh,0) == -1)
#endif
syslog(LOG_WARNING,"sendmsg: %s\n",strerror(errno));
} else if(rcmd == 'c') {
if(debug >= 1) syslog(LOG_INFO,"request clear()");
if(id_table_remove_stale(&table)) {
syslog(LOG_WARNING,"id_table_remove_stale: %s\n",strerror(errno));
break;
}
}
#ifdef HONOR_QUIT
else if(rcmd == 'q') {
if(debug >= 1) syslog(LOG_INFO,"quit requested");
break;
}
#endif
else {
syslog(LOG_WARNING,"invalid request received");
}
}
#ifndef DGRAM_MODE
if(csock >= 0) close(csock);
#endif
/*
* clean up (never really get this far)
*/
id_table_destroy(&table);
close(ssock);
exit(0);
return 0;
}
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