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/* © 2008 sqweek <sqweek@gmail.com>
* See COPYING for details.
*/
#include <err.h>
#include <mntent.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/mount.h>
#include <arpa/inet.h>
#include <pwd.h>
#include <netdb.h>
#define nelem(x) (sizeof(x)/sizeof(*(x)))
struct {char *mnemonic; int mask;} debug_flags[] = {
{"err", 0x001},
{"devel", 0x002},
{"9p", 0x004},
{"vfs", 0x008},
{"conv", 0x010},
{"mux", 0x020},
{"trans", 0x040},
{"alloc", 0x080},
{"fcall", 0x100}
};
char*
append(char **dest, char *src, int *destlen)
{
while (strlen(*dest) + 1 + strlen(src) > *destlen)
*destlen *= 2;
if (!(*dest=realloc(*dest, *destlen)))
errx(1, "out of memory");
if (**dest)
strcat(*dest, ",");
strcat(*dest, src);
return *dest;
}
char*
getarg(char opt, char *cp, char*** argv)
{
if (*(cp+1)) {
return cp+1;
} else if (*(*argv+1)) {
return *++(*argv);
} else {
errx(1, "-%c: expected argument", opt);
}
return NULL;
}
void
parsedial(char *dial, char **network, char **netaddr, int *port)
{
char *cp;
if (!(*network=strtok(dial, "!"))) {
errx(1, "empty dial string");
}
if (strcmp(*network, "unix") != 0
&& strcmp(*network, "tcp") != 0
&& strcmp(*network, "virtio") != 0) {
errx(1, "%s: unknown network (expecting unix, tcp or virtio)", *network);
}
if (!(*netaddr=strtok(NULL, "!"))) {
errx(1, "missing dial netaddress");
}
if (strcmp(*network, "tcp") == 0) {
char *service;
if ((service=strtok(NULL, "!"))) {
if (strspn(service, "0123456789") == strlen(service)) {
*port = atoi(service);
} else {
struct servent *sv;
if ((sv=getservbyname(service, *network))) {
/* sv->s_port is a 16-bit big endian masquerading as an int */
*port = ntohs((uint16_t)sv->s_port);
endservent();
} else {
errx(1, "%s: unknown service", service);
}
}
}
}
if ((cp=strtok(NULL, "!"))) {
errx(1, "%s: junk trailing dial string", cp);
}
}
int
main(int argc, char **argv)
{
char buf[256], *opts, *dial = NULL, *mountpt = NULL;
int optlen = 64, port = 0, i;
struct stat stbuf;
struct passwd *pw;
int axess = 0, dotu = 0, uidgid = 0, dev = 0, debug = 0, dryrun = 0;
char *debugstr = NULL, *msize = NULL, *cache = NULL, *aname = NULL;
char *cp, *proto, *addr;
if (!(opts=calloc(optlen, 1))) {
err(1, "calloc");
}
while (*++argv) {
if (**argv == '-' && (*argv)[1] != '\0') {
for (cp=*argv+1; *cp; ++cp) {
switch (*cp) {
case 'i': uidgid = 1; break;
case 'n': dryrun = 1; break;
case 's': axess = -1; break;
case 'u': dotu = 1; break;
case 'v': dev = 1; break;
case 'x': axess = getuid(); break;
case 'a':
aname = getarg('a', cp, &argv);
*cp-- = '\0'; /* breaks out of for loop */
break;
case 'c':
cache = getarg('c', cp, &argv);
*cp-- = '\0';
break;
case 'd':
debugstr = getarg('d', cp, &argv);
*cp-- = '\0';
break;
case 'm':
msize = getarg('m', cp, &argv);
*cp-- = '\0';
break;
}
}
} else if (!dial) {
dial = *argv;
} else if (!mountpt) {
mountpt = *argv;
} else {
errx(1, "%s: too many arguments", *argv);
}
}
if (!dial || !mountpt) {
errx(1, "usage: 9mount [ -insuvx ] [ -a spec ] [ -c cache ] [ -d debug ] [ -m msize ] dial mountpt");
}
if(!(pw=getpwuid(getuid()))) {
err(1, "who are you?? getpwuid failed");
}
/* Make sure mount exists, is writable, and not sticky */
if (stat(mountpt, &stbuf) || access(mountpt, W_OK)) {
err(1, "%s", mountpt);
}
if (stbuf.st_mode & S_ISVTX) {
errx(1, "%s: refusing to mount over sticky directory", mountpt);
}
if (strcmp(dial, "-") == 0) {
proto = "fd";
addr = "nodev";
append(&opts, "rfdno=0,wrfdno=1", &optlen);
} else {
parsedial(dial, &proto, &addr, &port);
}
/* set up mount options */
append(&opts, proto, &optlen); /* < 2.6.24 */
snprintf(buf, sizeof(buf), "trans=%s", proto);
append(&opts, buf, &optlen); /* >= 2.6.24 */
if (aname) {
if (strchr(aname, ',')) {
errx(1, "%s: spec can't contain commas", aname);
}
snprintf(buf, sizeof(buf), "aname=%s", aname);
append(&opts, buf, &optlen);
}
if (cache) {
if (strcmp(cache, "loose") != 0) {
errx(1, "%s: unknown cache mode (expecting loose)", cache);
}
snprintf(buf, sizeof(buf), "cache=%s", cache);
append(&opts, buf, &optlen);
}
if (debugstr) {
for (cp=strtok(debugstr, ","); cp; cp=strtok(NULL, ",")) {
for (i=0; i<nelem(debug_flags); ++i) {
if (strcmp(cp, debug_flags[i].mnemonic) == 0) {
debug |= debug_flags[i].mask;
break;
}
}
if (i >= nelem(debug_flags)) {
errx(1, "%s: unrecognised debug channel", cp);
}
}
snprintf(buf, sizeof(buf), "debug=0x%04x", debug);
append(&opts, buf, &optlen);
}
if (msize) {
if (strspn(msize, "0123456789") < strlen(msize)) {
errx(1, "%s: msize must be an integer", msize);
}
snprintf(buf, sizeof(buf), "msize=%s", msize);
append(&opts, buf, &optlen);
}
snprintf(buf, sizeof(buf), "name=%s", pw->pw_name);
append(&opts, buf, &optlen);
if (getenv("USER")) {
snprintf(buf, sizeof(buf), "uname=%s", getenv("USER"));
} else {
snprintf(buf, sizeof(buf), "uname=%s", pw->pw_name);
}
if (strchr(buf, ',')) {
errx(1, "%s: username can't contain commas", buf+6);
}
append(&opts, buf, &optlen);
if (axess == -1) {
append(&opts, "access=any", &optlen);
} else if (axess) {
snprintf(buf, sizeof(buf), "access=%d", axess);
append(&opts, buf, &optlen);
}
if (!dotu) {
append(&opts, "noextend", &optlen);
}
if (!dev) {
append(&opts, "nodev", &optlen);
}
if (uidgid) {
snprintf(buf, sizeof(buf), "uid=%d,gid=%d", getuid(), getgid());
append(&opts, buf, &optlen); /* < 2.6.24 */
snprintf(buf, sizeof(buf), "dfltuid=%d,dfltgid=%d", getuid(), getgid());
append(&opts, buf, &optlen); /* >= 2.6.24 */
}
if (port) {
snprintf(buf, sizeof(buf), "port=%d", port);
append(&opts, buf, &optlen);
}
if (strcmp(proto, "tcp") == 0) {
struct addrinfo *ai;
int r;
if ((r=getaddrinfo(addr, NULL, NULL, &ai))) {
errx(1, "getaddrinfo: %s", gai_strerror(r));
}
if ((r=getnameinfo(ai->ai_addr, ai->ai_addrlen, buf,
sizeof(buf), NULL, 0, NI_NUMERICHOST))) {
errx(1, "getnameinfo: %s", gai_strerror(r));
}
} else { /* unix socket, virtio device or fd transport */
snprintf(buf, sizeof(buf), "%s", addr);
}
if(dryrun) {
fprintf(stderr, "mount -t 9p -o %s %s %s\n", opts, buf, mountpt);
} else if (mount(buf, mountpt, "9p", 0, (void*)opts)) {
err(1, "mount");
}
return 0;
}
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