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9pmount-vsock: make a connection then execv /bin/mount

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The magic options are
  -o trans=fd,rfdno=<FD>,wfdno=<FD>

Signed-off-by: David Scott <dave.scott@docker.com>
This commit is contained in:
David Scott
2016-05-15 16:29:17 +01:00
parent ed616f8c26
commit 36d09be949
1 changed files with 34 additions and 12 deletions
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46
alpine/packages/9pmount-vsock/9pmount-vsock.c
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@@ -16,10 +16,14 @@
#include "compat.h" #include "compat.h"
int listen_flag = 0; #define NONE 0
int connect_flag = 0; #define LISTEN 1
#define CONNECT 2
int mode = NONE;
char *default_sid = "C378280D-DA14-42C8-A24E-0DE92A1028E2"; char *default_sid = "C378280D-DA14-42C8-A24E-0DE92A1028E2";
char *mount = "/bin/mount";
/* Helper macros for parsing/printing GUIDs */ /* Helper macros for parsing/printing GUIDs */
#define GUID_FMT "%08x-%04hx-%04hx-%02x%02x-%02x%02x%02x%02x%02x%02x" #define GUID_FMT "%08x-%04hx-%04hx-%02x%02x-%02x%02x%02x%02x%02x%02x"
@@ -61,6 +65,20 @@ void sockerr(const char *msg)
static void handle(SOCKET fd) static void handle(SOCKET fd)
{ {
char *options = NULL;
if (asprintf(&options, "trans=fd,dfltuid=1001,dfltgid=50,version=9p2000,rfdno=%d,wfdno=%d", fd, fd) < 0){
syslog(LOG_CRIT, "asprintf(): %s", strerror(errno));
exit(1);
}
char *argv[] = {
mount,
"-t", "9p", "-o", options,
"db", "/Database",
NULL
};
execv(mount, argv);
syslog(LOG_CRIT, "failed to execute %s: %s", mount, strerror(errno));
exit(1);
} }
static int create_listening_socket(GUID serviceid) { static int create_listening_socket(GUID serviceid) {
@@ -141,7 +159,7 @@ static int accept_socket(SOCKET lsock) {
void usage(char *name) void usage(char *name)
{ {
printf("%s usage:\n", name); printf("%s usage:\n", name);
printf("\t[--serviceid <guid>] [--listen | --connect]\n\n"); printf("\t[--serviceid <guid>] <listen | connect>\n");
printf("where\n"); printf("where\n");
printf("\t--serviceid <guid>: use <guid> as the well-known service GUID\n"); printf("\t--serviceid <guid>: use <guid> as the well-known service GUID\n");
printf("\t (defaults to %s)\n", default_sid); printf("\t (defaults to %s)\n", default_sid);
@@ -162,8 +180,6 @@ int __cdecl main(int argc, char **argv)
static struct option long_options[] = { static struct option long_options[] = {
/* These options set a flag. */ /* These options set a flag. */
{"serviceid", required_argument, NULL, 's'}, {"serviceid", required_argument, NULL, 's'},
{"listen", no_argument, &listen_flag, 1},
{"connect", no_argument, &connect_flag, 1},
{0, 0, 0, 0} {0, 0, 0, 0}
}; };
int option_index = 0; int option_index = 0;
@@ -183,14 +199,20 @@ int __cdecl main(int argc, char **argv)
exit (1); exit (1);
} }
} }
if ((listen_flag && connect_flag) || !(listen_flag || connect_flag)){ if (optind < argc) {
fprintf(stderr, "Please supply either the --listen or --connect flag, but not both.\n"); if (strcmp(argv[optind], "listen") == 0) {
mode = LISTEN;
} else if (strcmp(argv[optind], "connect") == 0) {
mode = CONNECT;
}
optind++;
}
if (mode == NONE) {
fprintf(stderr, "Please supply either listen or connect\n");
usage(argv[0]);
exit(1); exit(1);
} }
openlog(argv[0], LOG_CONS | LOG_NDELAY | LOG_PERROR, LOG_DAEMON);
int log_flags = LOG_CONS | LOG_NDELAY | LOG_PERROR;
openlog(argv[0], log_flags, LOG_DAEMON);
res = parseguid(serviceid, &sid); res = parseguid(serviceid, &sid);
if (res) { if (res) {
@@ -200,7 +222,7 @@ int __cdecl main(int argc, char **argv)
} }
SOCKET sock = INVALID_SOCKET; SOCKET sock = INVALID_SOCKET;
if (listen_flag) { if (mode == LISTEN) {
syslog(LOG_INFO, "starting in listening mode with serviceid=%s", serviceid); syslog(LOG_INFO, "starting in listening mode with serviceid=%s", serviceid);
SOCKET lsocket = create_listening_socket(sid); SOCKET lsocket = create_listening_socket(sid);
sock = accept_socket(lsocket); sock = accept_socket(lsocket);