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aaa3c6e7ccd64ae63190ffeb79c6645796a973ed
ncpfs/ncpmount.c
ncpfs archive import aaa3c6e7cc Import ncpfs 0.3
2026-04-28 20:39:57 +02:00

671 lines
16 KiB
C
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/*
* ncpmount.c
*
* Copyright (C) 1995 by Volker Lendecke
*
*/
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <pwd.h>
#include <grp.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/stat.h>
#include <sys/types.h>
/* #include <sys/wait.h> */ /* generates a warning here */
extern pid_t waitpid(pid_t, int *, int);
#include <sys/errno.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <mntent.h>
#include <linux/ipx.h>
#include <linux/fs.h>
#include <linux/ncp.h>
#include <linux/ncp_fs.h>
#include <linux/ncp_mount.h>
#include "ipxutil.h"
static char *progname;
static void
str_upper(char *name)
{
while (*name) {
*name = toupper(*name);
name = name + 1;
}
}
static char *
fullpath(const char *p)
{
char path[MAXPATHLEN];
if (realpath(p, path) == NULL)
return strdup(p);
else
return strdup(path);
}
static void
usage(void)
{
printf("usage: %s server mount-point [options]\n", progname);
printf("Try `%s -h' for more information\n", progname);
}
static void
help(void)
{
printf("\n");
printf("usage: %s server mount-point [options]\n", progname);
printf("\n"
"-U username Username sent to server\n"
"-u uid uid the mounted files get\n"
"-g gid gid the mounted files get\n"
"-f mode permission the files get (octal notation)\n"
"-d mode permission the dirs get (octal notation)\n"
"-C Don't convert password to uppercase\n"
"-P password Use this password\n"
"-n Do not use any password\n"
" If neither -P nor -n are given, you are\n"
" asked for a password.\n"
"-h print this help text\n"
"\n");
}
struct sap_query {
unsigned short query_type; /* net order */
unsigned short server_type; /* net order */
};
struct sap_server_ident {
unsigned short server_type __attribute__ ((packed));
char server_name[48] __attribute__ ((packed));
IPXNet server_network __attribute__ ((packed));
IPXNode server_node __attribute__ ((packed));
IPXPort server_port __attribute__ ((packed));
unsigned short intermediate_network __attribute__ ((packed));
};
void
ipx_fprint_node(FILE* file,IPXNode node)
{
fprintf(file,"%02X%02X%02X%02X%02X%02X",
(unsigned char)node[0],
(unsigned char)node[1],
(unsigned char)node[2],
(unsigned char)node[3],
(unsigned char)node[4],
(unsigned char)node[5]
);
}
void
ipx_fprint_network(FILE* file,IPXNet net)
{
fprintf(file,"%08lX",ntohl(net));
}
void
ipx_fprint_port(FILE* file,IPXPort port)
{
fprintf(file,"%04X",ntohs(port));
}
void
ipx_fprint_saddr(FILE* file,struct sockaddr_ipx* sipx)
{
ipx_fprint_network(file,sipx->sipx_network);
fprintf(file,":");
ipx_fprint_node(file,sipx->sipx_node);
fprintf(file,":");
ipx_fprint_port(file,sipx->sipx_port);
}
void
ipx_print_node(IPXNode node)
{
ipx_fprint_node(stdout,node);
}
void
ipx_print_network(IPXNet net)
{
ipx_fprint_network(stdout,net);
}
void
ipx_print_port(IPXPort port)
{
ipx_fprint_port(stdout,port);
}
void
ipx_print_saddr(struct sockaddr_ipx* sipx)
{
ipx_fprint_saddr(stdout,sipx);
}
int
ipx_sap_find_server(char *name, int server_type, int timeout,
struct sockaddr_ipx *result)
{
struct sockaddr_ipx ipxs;
char data[1024];
int sock;
int opt;
int res = -1;
int name_len = strlen(name);
fd_set rd, wr, ex;
struct timeval tv;
if (name_len > 48) {
return -1;
}
sock=socket(AF_IPX,SOCK_DGRAM,PF_IPX);
if (sock==-1) {
return -1;
}
opt=1;
/* Permit broadcast output */
if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST, &opt,sizeof(opt))==-1)
{
perror("setsockopt");
goto finished;
}
memset(&ipxs, 0, sizeof(ipxs));
ipxs.sipx_family=AF_IPX;
ipxs.sipx_network=htonl(0x0);
ipxs.sipx_port=htons(0x0);
ipxs.sipx_type=IPX_SAP_PTYPE;
if(bind(sock,(struct sockaddr*)&ipxs,sizeof(ipxs))==-1)
{
perror("bind");
goto finished;
}
*(unsigned short *)data = htons(0x0001);
*(unsigned short *)&(data[2]) = htons(server_type);
memset(&ipxs, 0, sizeof(ipxs));
ipxs.sipx_family=AF_IPX;
ipxs.sipx_network=htonl(0x0);
ipx_assign_node(ipxs.sipx_node, IPX_BROADCAST_NODE);
ipxs.sipx_port=htons(IPX_SAP_PORT);
ipxs.sipx_type=IPX_SAP_PTYPE;
if (sendto(sock, data, 4, 0,
(struct sockaddr *)&ipxs, sizeof(ipxs)) < 0) {
perror("sendto");
goto finished;
}
FD_ZERO(&rd); FD_ZERO(&wr); FD_ZERO(&ex);
FD_SET(sock, &rd);
tv.tv_sec = timeout;
tv.tv_usec = 0;
if (select(sock+1, &rd, &wr, &ex, &tv) == -1) {
perror("select");
goto finished;
}
if (FD_ISSET(sock, &rd)) {
int len = recv(sock, data, 1024, 0);
int i;
struct sap_server_ident *ident;
for (i = 2; i < len; i += 64) {
ident = (struct sap_server_ident *)(data+i);
if ( (strncmp(name,ident->server_name,name_len)==0)
&& (name_len < 48)
&& (ident->server_name[name_len] == '\0'))
{
result->sipx_family = AF_IPX;
result->sipx_network =
ident->server_network;
result->sipx_port = ident->server_port;
ipx_assign_node(result->sipx_node,
ident->server_node);
res = 0;
goto finished;
}
}
}
finished:
close(sock);
return res;
}
int
ipx_sscanf_node(char *buf, unsigned char node[6])
{
int i;
int n[6];
if ((i = sscanf(buf, "%2x%2x%2x%2x%2x%2x",
&(n[0]), &(n[1]), &(n[2]),
&(n[3]), &(n[4]), &(n[5]))) != 6) {
return i;
}
for (i=0; i<6; i++) {
node[i] = n[i];
}
return 6;
}
static int
parse_args(int argc, char *argv[], struct ncp_mount_data *data,
int *got_password, int *upcase_password)
{
int opt;
struct passwd *pwd;
struct group *grp;
*got_password = 0;
*upcase_password = 1;
while ((opt = getopt (argc, argv, "Cp:s:c:U:u:g:f:d:m:P:n")) != EOF) {
switch (opt) {
case 'C':
*upcase_password = 0;
break;
case 'U':
if (strlen(optarg) > 63) {
fprintf(stderr, "Username too long: %s\n",
optarg);
return 1;
}
strcpy(data->username, optarg);
break;
case 'u':
if (isdigit(optarg[0])) {
data->uid = atoi(optarg);
} else {
pwd = getpwnam(optarg);
if (pwd == NULL) {
fprintf(stderr, "Unknown user: %s\n",
optarg);
return 1;
}
data->uid = pwd->pw_uid;
}
break;
case 'g':
if (isdigit(optarg[0])) {
data->gid = atoi(optarg);
} else {
grp = getgrnam(optarg);
if (grp == NULL) {
fprintf(stderr, "Unknown group: %s\n",
optarg);
return 1;
}
data->gid = grp->gr_gid;
}
break;
case 'f':
data->file_mode = strtol(optarg, NULL, 8);
break;
case 'd':
data->dir_mode = strtol(optarg, NULL, 8);
break;
case 'P':
strcpy(data->password, optarg);
*got_password = 1;
break;
case 'n':
data->password[0] = '\0';
*got_password = 1;
break;
default:
return -1;
}
}
return 0;
}
/* Returns 0 if the filesystem is in the kernel after this routine
completes */
static int
load_ncpfs()
{
FILE *fver, *ffs;
char s[1024];
char modname[1024];
char *p, *p1;
pid_t pid;
int status;
/* Check if ncpfs is in the kernel */
ffs = fopen("/proc/filesystems", "r");
if (ffs == NULL) {
perror("Error: \"/proc/filesystems\" could not be read:");
return -1;
}
p = NULL;
while (! feof(ffs)) {
p1 = fgets(s, sizeof(s), ffs);
if (p1) {
p = strstr(s, "ncpfs");
if (p) {
break;
}
}
}
fclose(ffs);
if (p) {
return 0;
}
fver = fopen("/proc/version", "r");
if (fver == NULL) {
perror("Error: \"/proc/version\" could not be read:");
return -1;
}
fgets(s, 1024, fver);
fclose(fver);
p = strstr(s, "version ");
if (p == NULL) {
version_error:
fprintf(stderr, "Error: Unable to determine the Linux version"
"from \"/proc/version\n");
return -1;
}
p = strchr(p, ' ') + 1;
p1 = strchr(p, ' ');
if (p1 == NULL) {
goto version_error;
}
strcpy(modname, "/lib/modules/");
strncat(modname, p, p1 - p);
strcat(modname, "/ncpfs.o");
/* system() function without signal handling, from Stevens */
if ((pid = fork()) < 0) {
return 1;
} else if (pid == 0) {
/* child */
execl("/sbin/insmod", "insmod", modname, NULL);
_exit(127); /* execl error */
} else {
/* parent */
while (waitpid(pid, &status, 0) < 0) {
if (errno != EINTR) {
status = -1;
break;
}
}
}
return status;
}
/* Check whether user is allowed to mount on the specified mount point */
static int
mount_ok(struct stat *st)
{
if (!S_ISDIR(st->st_mode))
{
errno = ENOTDIR;
return -1;
}
if ( (getuid() != 0)
&& ( (getuid() != st->st_uid)
|| ((st->st_mode & S_IRWXU) != S_IRWXU)))
{
errno = EPERM;
return -1;
}
return 0;
}
int
main(int argc, char *argv[])
{
struct ncp_mount_data data;
struct sockaddr_ipx addr;
struct stat st;
int fd;
int Got_Password;
int Upcase_Password;
int um;
unsigned int flags;
char hostname[MAXHOSTNAMELEN + 1];
char *server_name;
char *mount_point;
struct mntent ment;
FILE *mtab;
int ncp_sock, wdog_sock;
progname = argv[0];
if (geteuid() != 0) {
fprintf(stderr, "%s must be installed suid root\n", progname);
exit(1);
}
memset(&data, 0, sizeof(struct ncp_mount_data));
memset(hostname, '\0', MAXHOSTNAMELEN+1);
gethostname(hostname, MAXHOSTNAMELEN);
if (argc < 3) {
if ( (argc == 2)
&& (argv[1][0] == '-')
&& (argv[1][1] == 'h')
&& (argv[1][2] == '\0')) {
help();
return 0;
}
else
{
usage();
return -1;
}
}
server_name = argv[1];
mount_point = argv[2];
argv += 2;
argc -= 2;
if (stat(mount_point, &st) == -1) {
fprintf(stderr, "could not find mount point %s: %s\n",
mount_point, strerror(errno));
exit(1);
}
if (mount_ok(&st) != 0) {
fprintf(stderr, "cannot to mount on %s: %s\n",
mount_point, strerror(errno));
exit(1);
}
ncp_sock = socket(AF_IPX, SOCK_DGRAM, PF_IPX);
if (ncp_sock == -1) {
fprintf(stderr, "could not open ncp socket: %s\n",
strerror(errno));
exit(1);
}
wdog_sock = socket(AF_IPX, SOCK_DGRAM, PF_IPX);
if (wdog_sock == -1) {
fprintf(stderr, "could not open wdog socket: %s\n",
strerror(errno));
exit(1);
}
addr.sipx_type = NCP_PTYPE;
if (bind(ncp_sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
fprintf(stderr, "bind(ncp_sock, ): %s\n",
strerror(errno));
exit(1);
}
if (bind(wdog_sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
fprintf(stderr, "bind(wdog_sock, ): %s\n",
strerror(errno));
exit(1);
}
if (ipx_sap_find_server(server_name, IPX_SAP_FILE_SERVER,
3, &addr) != 0) {
fprintf(stderr, "could not find server %s\n", server_name);
exit(1);
}
/* Check if the ncpfs filesystem is in the kernel. If not, attempt
* to load the ncpfs module */
if (load_ncpfs() != 0) {
fprintf(stderr, "Error: Unable to start ncpfs, exiting...\n");
exit(1);
}
data.version = NCP_MOUNT_VERSION;
data.ncp_fd = ncp_sock;
data.wdog_fd = wdog_sock;
data.mounted_uid = getuid();
data.serv_addr = addr;
strcpy(data.server_name, server_name);
data.time_out = 20; /* 2 seconds */
data.retry_count = 2;
/* getuid() gives us the real uid, who may umount the fs */
data.mounted_uid = getuid();
if (getenv("USER")) {
strcpy(data.username, getenv("USER"));
str_upper(data.username);
}
if (data.username[0] == 0 && getenv("LOGNAME"))
{
strcpy(data.username,getenv("LOGNAME"));
str_upper(data.username);
}
data.uid = getuid();
data.gid = getgid();
um = umask(0);
umask(um);
data.file_mode = (S_IRWXU|S_IRWXG|S_IRWXO) & ~um;
data.dir_mode = 0;
if (parse_args(argc, argv, &data, &Got_Password,
&Upcase_Password) != 0) {
usage();
return -1;
}
if (data.dir_mode == 0) {
data.dir_mode = data.file_mode;
if ((data.dir_mode & S_IRUSR) != 0)
data.dir_mode |= S_IXUSR;
if ((data.dir_mode & S_IRGRP) != 0)
data.dir_mode |= S_IXGRP;
if ((data.dir_mode & S_IROTH) != 0)
data.dir_mode |= S_IXOTH;
}
if (Got_Password == 0) {
strcpy(data.password, getpass("Password: "));
}
if (Upcase_Password == 1) {
str_upper(data.password);
}
if (data.server_name[0] == '\0') {
strcpy(data.server_name, server_name);
str_upper(data.server_name);
}
flags = MS_MGC_VAL;
if (mount(NULL, mount_point, "ncpfs",
flags, (char *)&data) < 0) {
perror("mount error");
close(wdog_sock);
close(ncp_sock);
printf("Maybe you should try to type the username and\n"
"password in UPPERCASE.\n");
return -1;
}
close(ncp_sock);
close(wdog_sock);
ment.mnt_fsname = server_name;
ment.mnt_dir = fullpath(mount_point);
ment.mnt_type = "ncpfs";
ment.mnt_opts = "rw";
ment.mnt_freq = 0;
ment.mnt_passno= 0;
mount_point = ment.mnt_dir;
if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
{
fprintf(stderr, "Can't get "MOUNTED"~ lock file");
return 1;
}
close(fd);
if ((mtab = setmntent(MOUNTED, "a+")) == NULL)
{
fprintf(stderr, "Can't open " MOUNTED);
return 1;
}
if (addmntent(mtab, &ment) == 1)
{
fprintf(stderr, "Can't write mount entry");
return 1;
}
if (fchmod(fileno(mtab), 0644) == -1)
{
fprintf(stderr, "Can't set perms on "MOUNTED);
return 1;
}
endmntent(mtab);
if (unlink(MOUNTED"~") == -1)
{
fprintf(stderr, "Can't remove "MOUNTED"~");
return 1;
}
return 0;
}
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