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rpc_transport.c
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rpc_transport.c
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#include "internal.h"
#include "rpc_transport.h"
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
static socket_info
parse_url (const char *url)
{
socket_info sock = g_malloc0 (sizeof (*sock));
char host[INET6_ADDRSTRLEN];
int port = 9999;
/* UNIX path = "unix:///<unix-path>[:<apteryx-path>]" */
if (strncmp (url, "unix://", 7) == 0)
{
const char *name = url + strlen ("unix://");
const char *end = strchr (name, ':');
int len = end ? end - name : strlen (name);
sock->family = PF_UNIX;
sock->address_len = sizeof (sock->address.addr_un);
memset (&sock->address.addr_un, 0, sock->address_len);
sock->address.addr_un.sun_family = AF_UNIX;
strncpy (sock->address.addr_un.sun_path, name,
len >= sizeof (sock->address.addr_un.sun_path) ?
sizeof (sock->address.addr_un.sun_path)-1 : len);
DEBUG ("RPC: unix://%s\n", sock->address.addr_un.sun_path);
}
/* IPv4 TCP path = "tcp://<IPv4>:<port>[:<apteryx-path>]" */
else if (sscanf (url, "tcp://%16[^:]:%d", host, &port) == 2)
{
if (inet_pton (AF_INET, host, &sock->address.addr_in.sin_addr) != 1)
{
ERROR ("RPC: Invalid IPv4 address: %s\n", host);
g_free (sock);
return NULL;
}
sock->family = AF_INET;
sock->address_len = sizeof (sock->address.addr_in);
sock->address.addr_in.sin_family = AF_INET;
sock->address.addr_in.sin_port = htons (port);
DEBUG ("RPC: tcp://%s:%u\n",
inet_ntop (AF_INET, &sock->address.addr_in.sin_addr,
host, INET6_ADDRSTRLEN), port);
}
/* IPv6 TCP path = "tcp:[<IPv6>]:<port>[:<apteryx-path>]" */
else if (sscanf (url, "tcp://[%45[^]]]:%d", host, &port) == 2)
{
if (inet_pton (AF_INET6, host, &sock->address.addr_in6.sin6_addr) != 1)
{
ERROR ("RPC: Invalid IPv6 address: %s\n", host);
g_free (sock);
return NULL;
}
sock->family = AF_INET6;
sock->address_len = sizeof (sock->address.addr_in6);
sock->address.addr_in6.sin6_family = AF_INET6;
sock->address.addr_in6.sin6_port = htons (port);
DEBUG ("RPC: tcp://[%s]:%u\n",
inet_ntop (AF_INET6, &sock->address.addr_in6.sin6_addr,
host, INET6_ADDRSTRLEN), port);
}
else
{
ERROR ("RPC: Invalid URL: %s\n", url);
g_free (sock);
return NULL;
}
return sock;
}
static bool
get_peer_details (int fd, uint64_t *pid, uint64_t *ns)
{
struct ucred ucred;
socklen_t uclen = sizeof(struct ucred);
struct stat st = { 0 };
char *path;
*pid = 0;
*ns = 0;
/* Get socket peer pid */
if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &ucred, &uclen))
{
ERROR ("RPC: Failed to get socket peer pid: %s\n", strerror (errno));
return false;
}
*pid = (uint64_t) ucred.pid;
/* Get socket peer namespace */
path = g_strdup_printf ("/proc/%"PRIu64"/ns/mnt", *pid);
if (stat (path, &st))
{
DEBUG ("RPC: Failed to get socket peer(pid=%"PRIu64") namespace: %s\n", *pid, strerror (errno));
free (path);
return false;
}
*ns = (uint64_t) st.st_ino;
free (path);
/* Check if we are in a different namespace */
if (*ns != getns ())
{
char *cmd = g_strdup_printf ("grep NSpid /proc/%"PRIu64"/status | cut -f3", *pid);
FILE *file = popen (cmd, "r");
uint64_t nspid = 0;
if (!file || fscanf (file, "%"PRIu64, &nspid) != 1)
{
ERROR ("RPC: Failed to get socket pid in other namespace: %s\n", strerror (errno));
if (file)
pclose (file);
free (cmd);
return false;
}
if (file)
pclose (file);
free (cmd);
DEBUG ("RPC: Peer namespace different (here:%"PRIX64".%"PRIu64" there:%"PRIX64".%"PRIu64")\n",
getns (), *pid, *ns, nspid);
*pid = nspid;
}
return true;
}
static void *
accept_thread (void *p)
{
/* Mask signals */
sigset_t set;
sigfillset (&set);
pthread_sigmask (SIG_BLOCK, &set, NULL);
rpc_server s = (rpc_server) p;
while (1)
{
struct sockaddr addr;
socklen_t len = sizeof (addr);
int new_fd = accept (s->sock, &addr, &len);
if (new_fd != -1)
{
uint64_t pid = 0;
uint64_t ns = 0;
if (s->sockinfo && s->sockinfo->family == AF_UNIX)
get_peer_details (new_fd, &pid, &ns);
DEBUG ("RPC: New client (fd=%i, id=%"PRIX64".%"PRIu64")\n", new_fd, ns, pid);
rpc_socket r = rpc_socket_create (new_fd, s->request_cb, s, pid, ns);
r->priv = s->parent->priv;
pthread_mutex_lock (&s->lock);
GList *iter = NULL;
/* This may be a reused fd, so close the old ones */
for (iter = s->clients; iter; iter = g_list_next(iter))
{
rpc_socket extant = iter->data;
if (extant->sock == new_fd)
{
DEBUG ("RPC: Closing reused socket");
extant->dead = true;
}
}
s->clients = g_list_append (s->clients, r);
if (!rpc_socket_process (r))
{
s->clients = g_list_remove (s->clients, r);
rpc_socket_deref (r);
}
pthread_mutex_unlock (&s->lock);
}
}
return 0;
}
rpc_server
create_rpc_server_with_listener (const char *guid, const char *url, int fd, rpc_callback cb,
rpc_service parent, socket_info sock)
{
rpc_server s = g_malloc0 (sizeof (*s));
s->sock = fd;
fcntl(fd, F_SETFD, FD_CLOEXEC);
s->url = g_strdup (url);
s->guid = g_strdup (guid);
s->request_cb = cb;
s->parent = parent;
s->sockinfo = sock;
pthread_mutex_init (&s->lock, NULL);
pthread_create (&s->thread, NULL, accept_thread, s);
return s;
}
rpc_service
rpc_server_parent_get (rpc_server s)
{
if (s == NULL)
{
return NULL;
}
return s->parent;
}
static bool
socket_is_active(socket_info sock)
{
bool active = false;
int sockfd = socket (sock->family, SOCK_STREAM, 0);
if (sockfd >= 0) {
if (connect (sockfd, (struct sockaddr *) &sock->address, sock->address_len) == 0) {
active = true;
}
close (sockfd);
}
return active;
}
bool
rpc_server_die (rpc_server s)
{
close (s->sock);
usleep (1000);
pthread_mutex_lock (&s->lock);
pthread_cancel (s->thread);
pthread_join (s->thread, NULL);
for (GList *itr = s->clients; itr; itr = itr->next)
{
rpc_socket sock = (rpc_socket) itr->data;
sock->parent = NULL;
rpc_socket_deref (sock);
}
g_list_free (s->clients);
pthread_mutex_unlock (&s->lock);
if (s->sockinfo->family == AF_UNIX && !socket_is_active (s->sockinfo))
{
unlink (s->sockinfo->address.addr_un.sun_path);
}
g_free (s->sockinfo);
g_free (s->url);
g_free (s->guid);
g_free (s);
return true;
}
rpc_service
rpc_service_init (rpc_callback cb, void *priv)
{
rpc_service s = g_malloc0 (sizeof (*s));
pthread_mutex_init (&s->lock, NULL);
s->request_cb = cb;
s->priv = priv;
return s;
}
bool
rpc_service_run (rpc_service s, int stopfd)
{
char data[10];
if (stopfd)
while (read (stopfd, data, 10) == 0) ;
else
while (1) { pause(); }
return false;
}
rpc_server
rpc_service_find_server (rpc_service s, const char *guid)
{
pthread_mutex_lock (&s->lock);
for (GList *itr = s->servers; itr; itr = itr->next)
{
if (strcmp (((rpc_server)itr->data)->guid, guid) == 0)
{
pthread_mutex_unlock (&s->lock);
return (rpc_server)itr->data;
}
}
pthread_mutex_unlock (&s->lock);
return NULL;
}
static bool
rpc_service_add_server (rpc_service s, rpc_server serv)
{
pthread_mutex_lock (&s->lock);
s->servers = g_list_append (s->servers, serv);
pthread_mutex_unlock (&s->lock);
return true;
}
static bool
rpc_service_remove_server (rpc_service s, rpc_server serv)
{
pthread_mutex_lock (&s->lock);
s->servers = g_list_remove (s->servers, serv);
pthread_mutex_unlock (&s->lock);
return true;
}
void *
rpc_service_priv_get (rpc_service s)
{
if (s == NULL)
{
return NULL;
}
return s->priv;
}
bool
rpc_service_die (rpc_service s)
{
/* Stop all of the servers */
pthread_mutex_lock (&s->lock);
for (GList *itr = s->servers; itr; itr = itr->next)
{
rpc_server serv = (rpc_server) itr->data;
rpc_server_die (serv);
}
pthread_mutex_unlock (&s->lock);
g_list_free (s->servers);
g_free ((void*)s);
return true;
}
bool
rpc_service_bind_url (rpc_service s, const char *guid, const char *url)
{
int on = 1;
/* Already exists */
if (rpc_service_find_server (s, url))
{
return false;
}
/* Parse the URL */
socket_info sock = parse_url (url);
if (sock == NULL)
{
return false;
}
/* Create the listen socket */
int fd = socket (sock->family, SOCK_STREAM, 0);
if (fd < 0)
{
ERROR ("RPC: Socket(%s) failed: %s\n", url, strerror (errno));
g_free (sock);
return false;
}
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on));
if (bind (fd, (struct sockaddr *)&sock->address, sock->address_len) < 0)
{
ERROR ("RPC: Socket(%s) error binding: %s\n", url, strerror (errno));
close (fd);
g_free (sock);
return false;
}
if (listen (fd, 255) < 0)
{
ERROR ("RPC: Socket(%s) listen failed: %s\n", url, strerror (errno));
close (fd);
g_free (sock);
return false;
}
if (sock->family == AF_UNIX)
{
chmod (sock->address.addr_un.sun_path, 0666);
}
DEBUG ("RPC: New Socket (%d:%s)\n", fd, url);
rpc_server serv = create_rpc_server_with_listener (guid, url, fd, s->request_cb, s, sock);
rpc_service_add_server (s, serv);
return true;
}
bool
rpc_service_unbind_url (rpc_service s, const char *guid)
{
rpc_server serv = rpc_service_find_server (s, guid);
if (serv == NULL)
{
return false;
}
rpc_service_remove_server (s, serv);
rpc_server_die (serv);
return true;
}
rpc_socket
rpc_socket_connect_service (const char *url, rpc_callback cb)
{
socket_info sock;
rpc_socket client;
/* Parse URL */
sock = parse_url (url);
if (sock == NULL)
{
return NULL;
}
DEBUG ("RPC: New Client\n");
/* Create socket */
int fd = socket (sock->family, SOCK_STREAM, 0);
if (fd < 0)
{
ERROR ("RPC: socket() failed: %s\n", strerror (errno));
g_free (sock);
return NULL;
}
if (connect (fd, (struct sockaddr *) &sock->address, sock->address_len) < 0
&& errno != EINPROGRESS)
{
ERROR ("RPC: error connecting to remote host: %s\n", strerror (errno));
close (fd);
g_free (sock);
return NULL;
}
DEBUG ("RPC[%d]: Connected to Server\n", fd);
/* Create client */
client = rpc_socket_create (fd, cb, NULL, 0, getns ());
g_free (sock);
return client;
}