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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#include <event2/event.h>
#include "conffile.h"
#include "reexport_backend.h"
#include "reexport.h"
#include "xcommon.h"
#include "xlog.h"
static struct event_base *evbase;
static struct reexpdb_backend_plugin *dbbackend = &sqlite_plug_ops;
/* assert_safe() always evalutes it argument, as it might have
* a side-effect. assert() won't if compiled with NDEBUG
*/
#define assert_safe(__sideeffect) (__sideeffect ? 0 : ({assert(0) ; 0;}))
static void client_cb(evutil_socket_t cl, short ev, void *d)
{
struct event *me = d;
char buf[PATH_MAX * 2];
int n;
(void)ev;
n = recv(cl, buf, sizeof(buf) - 1, 0);
if (n <= 0) {
event_del(me);
event_free(me);
close(cl);
return;
}
buf[n] = '\0';
if (strncmp(buf, "get_fsidnum ", strlen("get_fsidnum ")) == 0) {
char *req_path = buf + strlen("get_fsidnum ");
uint32_t fsidnum;
char *answer = NULL;
bool found;
assert(req_path < buf + n );
printf("client asks for %s\n", req_path);
if (dbbackend->fsidnum_by_path(req_path, &fsidnum, false, &found)) {
if (found)
assert_safe(asprintf(&answer, "+ %u", fsidnum) != -1);
else
assert_safe(asprintf(&answer, "+ ") != -1);
} else {
assert_safe(asprintf(&answer, "- %s", "Command failed") != -1);
}
(void)send(cl, answer, strlen(answer), 0);
free(answer);
} else if (strncmp(buf, "get_or_create_fsidnum ", strlen("get_or_create_fsidnum ")) == 0) {
char *req_path = buf + strlen("get_or_create_fsidnum ");
uint32_t fsidnum;
char *answer = NULL;
bool found;
assert(req_path < buf + n );
if (dbbackend->fsidnum_by_path(req_path, &fsidnum, true, &found)) {
if (found) {
assert_safe(asprintf(&answer, "+ %u", fsidnum) != -1);
} else {
assert_safe(asprintf(&answer, "+ ") != -1);
}
} else {
assert_safe(asprintf(&answer, "- %s", "Command failed") != -1);
}
(void)send(cl, answer, strlen(answer), 0);
free(answer);
} else if (strncmp(buf, "get_path ", strlen("get_path ")) == 0) {
char *req_fsidnum = buf + strlen("get_path ");
char *path = NULL, *answer = NULL, *endp;
bool bad_input = true;
uint32_t fsidnum;
bool found;
assert(req_fsidnum < buf + n );
errno = 0;
fsidnum = strtoul(req_fsidnum, &endp, 10);
if (errno == 0 && *endp == '\0') {
bad_input = false;
}
if (bad_input) {
assert_safe(asprintf(&answer, "- %s", "Command failed: Bad input") != -1);
} else {
if (dbbackend->path_by_fsidnum(fsidnum, &path, &found)) {
if (found)
assert_safe(asprintf(&answer, "+ %s", path) != -1);
else
assert_safe(asprintf(&answer, "+ ") != -1);
} else {
assert_safe(asprintf(&answer, "+ ") != -1);
}
}
(void)send(cl, answer, strlen(answer), 0);
free(path);
free(answer);
} else if (strcmp(buf, "version") == 0) {
char answer[] = "+ 1";
(void)send(cl, answer, strlen(answer), 0);
} else {
char *answer = NULL;
assert_safe(asprintf(&answer, "- bad command") != -1);
(void)send(cl, answer, strlen(answer), 0);
free(answer);
}
}
static void srv_cb(evutil_socket_t fd, short ev, void *d)
{
int cl = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
struct event *client_ev;
(void)ev;
(void)d;
client_ev = event_new(evbase, cl, EV_READ | EV_PERSIST | EV_CLOSED, client_cb, event_self_cbarg());
event_add(client_ev, NULL);
}
int main(void)
{
struct event *srv_ev;
struct sockaddr_un addr;
char *sock_file;
int srv;
conf_init_file(NFS_CONFFILE);
if (!dbbackend->initdb()) {
return 1;
}
sock_file = conf_get_str_with_def("reexport", "fsidd_socket", FSID_SOCKET_NAME);
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, sock_file, sizeof(addr.sun_path) - 1);
if (addr.sun_path[0] == '@')
/* "abstract" socket namespace */
addr.sun_path[0] = 0;
else
unlink(sock_file);
srv = socket(AF_UNIX, SOCK_SEQPACKET | SOCK_NONBLOCK, 0);
if (srv == -1) {
xlog(L_WARNING, "Unable to create AF_UNIX socket for %s: %m\n", sock_file);
return 1;
}
if (bind(srv, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un)) == -1) {
xlog(L_WARNING, "Unable to bind %s: %m\n", sock_file);
return 1;
}
if (listen(srv, 5) == -1) {
xlog(L_WARNING, "Unable to listen on %s: %m\n", sock_file);
return 1;
}
evbase = event_base_new();
srv_ev = event_new(evbase, srv, EV_READ | EV_PERSIST, srv_cb, NULL);
event_add(srv_ev, NULL);
event_base_dispatch(evbase);
dbbackend->destroydb();
return 0;
}
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