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/*
* mount_nfs.c
*
* Module for Linux automountd to mount an NFS filesystem, with fallback to
* symlinking if the path is local
*
*/
#include <stdio.h>
#include <malloc.h>
#include <errno.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>
#define MODULE_MOUNT
#include "automount.h"
#define MODPREFIX "mount(nfs): "
int mount_version = AUTOFS_MOUNT_VERSION; /* Required by protocol */
static int udpproto;
static short port_discard;
int mount_init(void **context)
{
struct protoent *udp;
struct servent *port_dis;
/* These are context independent */
udp = getprotobyname("udp");
udpproto = udp ? udp->p_proto : 0;
port_dis = getservbyname("discard","udp");
if ( port_dis )
port_discard = port_dis->s_port;
else
port_discard = htons(9); /* 9 is the standard discard port */
return 0;
}
int mount_mount(char *root, char *name, int name_len, char *what,
char *fstype, char *options, void *context)
{
char *colon, **haddr, *fullpath;
struct hostent *he;
struct sockaddr_in saddr, laddr;
int sock, local, err;
size_t len;
colon = strchr(what, ':');
if ( !colon ) {
/* No colon, take this as a symlink (local) entry */
syslog(LOG_DEBUG, MODPREFIX "entry %s -> %s: no colon, assume local",
name, what);
chdir(root);
err = symlink(what, name);
if ( err && errno == EEXIST )
err = 0;
if ( err )
syslog(LOG_NOTICE, MODPREFIX "symlink %s: %m", name);
chdir("/");
return err ? 1 : 0;
}
*colon = '\0';
if ( !(he = gethostbyname(what)) ) {
syslog(LOG_NOTICE, MODPREFIX "entry %s: host %s: lookup failure",
name, what);
return 1; /* No such host */
}
/* Probe to see if we are the local host. Open a UDP socket and see
if the local address is the same as the remote one */
local = 0;
for ( haddr = he->h_addr_list ; *haddr ; haddr++ ) {
sock = socket(AF_INET, SOCK_DGRAM, udpproto);
if ( sock < 0 ) {
syslog(LOG_ERR, MODPREFIX "socket: %m");
return 1;
}
saddr.sin_family = AF_INET;
bcopy(*haddr, &saddr.sin_addr, he->h_length);
saddr.sin_port = port_discard;
len = sizeof(laddr);
if ( connect(sock, (struct sockaddr *) &saddr, sizeof(saddr)) < 0
|| getsockname(sock, (struct sockaddr *) &laddr, &len) < 0 ) {
syslog(LOG_ERR, MODPREFIX "connect+getsockname failed for %s", name);
close(sock);
return 1;
}
close(sock);
if ( !memcmp(&saddr.sin_addr,&laddr.sin_addr,he->h_length) ) {
local = 1;
break;
}
}
if ( local ) {
/* Local host -- do a symlink */
syslog(LOG_DEBUG, MODPREFIX "%s is local, symlinking", name);
chdir(root);
err = symlink(colon+1, name);
if ( err && errno == EEXIST )
err = 0;
if ( err )
syslog(LOG_NOTICE, MODPREFIX "symlink %s: %m", name);
chdir("/");
return err ? 1 : 0;
} else {
/* Not a local host - do a mount */
fullpath = alloca(strlen(root)+name_len+2);
if ( !fullpath ) {
syslog(LOG_ERR, MODPREFIX "alloca: %m");
return 1;
}
sprintf(fullpath, "%s/%s", root, name);
*colon = ':';
syslog(LOG_DEBUG, MODPREFIX "calling mkdir %s", fullpath);
if ( mkdir(fullpath, 0555) && errno != EEXIST ) {
syslog(LOG_NOTICE, MODPREFIX "mkdir %s failed: %m", name);
return 1;
}
if ( options ) {
syslog(LOG_DEBUG, MODPREFIX "calling mount -t nfs -o %s %s %s",
options, what, fullpath);
err = spawnl(LOG_NOTICE, _PATH_MOUNT, _PATH_MOUNT, "-t", "nfs", "-o",
options, what, fullpath, NULL);
} else {
syslog(LOG_DEBUG, MODPREFIX "calling mount -t nfs %s %s", what, fullpath);
err = spawnl(LOG_NOTICE, _PATH_MOUNT, _PATH_MOUNT, "-t", "nfs",
what, fullpath, NULL);
}
if ( err ) {
rmdir(fullpath);
syslog(LOG_NOTICE, MODPREFIX "nfs: mount failure %s on %s",
what, fullpath);
return 1;
} else {
syslog(LOG_DEBUG, MODPREFIX "mounted %s on %s", what, fullpath);
return 0;
}
}
}
int mount_done(void *context)
{
return 0;
}
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