mirror of
https://github.com/Mathewnd/Astral.git
synced 2026-10-27 12:48:22 +00:00
local sockets: initial implementation
This commit is contained in:
Matheus
@@ -0,0 +1,748 @@
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#include <kernel/sock.h>
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#include <logging.h>
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#include <kernel/alloc.h>
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#include <kernel/interrupt.h>
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#include <ringbuffer.h>
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#include <kernel/vfs.h>
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#define SOCKET_BUFFER (256 * 1024)
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struct localpair_t;
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struct binding_t;
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typedef struct {
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socket_t socket;
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char *bindpath;
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ringbuffer_t ringbuffer; // shared with pair
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// client/connected server
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struct localpair_t *pair;
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// listening server
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struct binding_t *binding;
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struct localpair_t **backlog; // shared with binding
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int backlogsize; // shared with binding
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uintmax_t backlogcurrentwrite; // shared with binding
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uintmax_t backlogcurrentread; // shared with binding
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} localsocket_t;
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// created by the client socket
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// stays allocated until the last socket is closing
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// in the case of a socket closing while on the backlog, it will remain allocated on the backlog until then
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// connected whenever both arent NULL
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// the mutex also protect shared data (such as the ringbuffer)
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typedef struct localpair_t {
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localsocket_t *server; // from accept()
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localsocket_t *client; // from connect()
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mutex_t mutex;
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} localpair_t;
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// created on a bind
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// binding stays valid as long as both the server socket and vnode are still alive
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// keeps a reference to the vnode, but is only deleted from the vnode destructor
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// so when the server socket destructor is called, it needs to unref the vnode
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// to indicate the binding is no longer used. if the vnode refcount turns 0 then the binding
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// will be destroyed.
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// see localsock_destroy() (server side) and localsock_leavebinding() (vnode side)
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typedef struct binding_t {
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localsocket_t *server;
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vnode_t *vnode;
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mutex_t mutex;
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} binding_t;
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static inline void pushbacklog(localsocket_t *server, localpair_t *pair) {
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__assert(server->backlogcurrentwrite < server->backlogcurrentread + server->backlogsize);
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server->backlog[server->backlogcurrentwrite++] = pair;
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}
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static inline localpair_t *popbacklog(localsocket_t *server) {
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__assert(server->backlogcurrentread < server->backlogcurrentwrite);
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localpair_t *pair = server->backlog[server->backlogcurrentread];
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server->backlog[server->backlogcurrentread] = NULL;
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return pair;
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}
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static int datapoll(localsocket_t *local, localsocket_t *peer, int events) {
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int revents = 0;
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// data to read?
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if ((events & POLLIN) && RINGBUFFER_DATACOUNT(&local->ringbuffer))
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revents |= POLLIN;
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// space to write?
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if ((events & POLLOUT) && RINGBUFFER_DATACOUNT(&peer->ringbuffer) != SOCKET_BUFFER)
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revents |= POLLOUT;
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return revents;
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}
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static int listeningpoll(localsocket_t *localsocket, int events) {
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int revents = 0;
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// can insert into backlog?
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if (localsocket->backlogcurrentwrite < localsocket->backlogcurrentread + localsocket->backlogsize)
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revents |= (events & POLLOUT) ? POLLOUT : 0;
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// can accept()?
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if (localsocket->backlogcurrentwrite != localsocket->backlogcurrentread)
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revents |= (events & POLLIN) ? POLLIN : 0;
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return revents;
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}
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static int clientpoll(localsocket_t *localsocket, int events) {
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localsocket_t *server = localsocket->pair->server;
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// server disconnected
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if (server == NULL)
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return POLLHUP;
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// the client has one more possible poll check:
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// it can still be connecting with the other end
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// so check if server has a backlog. if so, nothing can be done yet
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if (server->backlog)
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return 0;
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return datapoll(localsocket, server, events);
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}
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static int serverpoll(localsocket_t *localsocket, int events) {
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localsocket_t *client = localsocket->pair->client;
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// client disconnected
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if (client == NULL)
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return POLLHUP;
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return datapoll(localsocket, client, events);
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}
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// assumes all the needed locks for each case are being held
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static int internalpoll(socket_t *socket, polldata_t *data, int events) {
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localsocket_t *localsocket = (localsocket_t *)socket;
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int revents = 0;
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// 4 possible cases:
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// socket is listening
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if (localsocket->backlog)
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revents = listeningpoll(localsocket, events);
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// socket is client
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else if (localsocket->pair && localsocket->pair->client == localsocket)
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revents = clientpoll(localsocket, events);
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// socket is server
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else if (localsocket->pair && localsocket->pair->server == localsocket)
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revents = serverpoll(localsocket, events);
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// socket is not doing anything (closed/only bound)
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else
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revents = POLLHUP;
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if (revents == 0 && data)
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poll_add(&socket->pollheader, data, events);
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return revents;
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}
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int localsock_poll(socket_t *socket, polldata_t *data, int events) {
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localsocket_t *localsocket = (localsocket_t *)socket;
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MUTEX_ACQUIRE(&socket->mutex, false);
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if (localsocket->binding)
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MUTEX_ACQUIRE(&localsocket->binding->mutex, false);
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if (localsocket->pair)
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MUTEX_ACQUIRE(&localsocket->pair->mutex, false);
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int revents = internalpoll(socket, data, events);
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if (localsocket->pair)
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MUTEX_RELEASE(&localsocket->pair->mutex);
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if (localsocket->binding)
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MUTEX_RELEASE(&localsocket->binding->mutex);
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MUTEX_RELEASE(&socket->mutex);
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return revents;
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}
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static int localsock_send(socket_t *socket, sockaddr_t *addr, void *buffer, size_t count, uintmax_t flags, size_t *sendcount) {
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localsocket_t *localsocket = (localsocket_t *)socket;
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MUTEX_ACQUIRE(&socket->mutex, false);
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int error;
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localpair_t *pair = localsocket->pair;
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// socket not connected
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if (pair == NULL) {
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error = ENOTCONN;
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goto leave;
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}
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MUTEX_ACQUIRE(&pair->mutex, false);
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// check/wait for space
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for (;;) {
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polldesc_t desc = {0};
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error = poll_initdesc(&desc, 1);
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if (error)
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goto leave;
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// if the client has closed this will return POLLHUP
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int revents = internalpoll(socket, &desc.data[0], POLLOUT);
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if (revents) {
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poll_leave(&desc);
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poll_destroydesc(&desc);
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break;
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}
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if (flags & V_FFLAGS_NONBLOCKING) {
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error = EAGAIN;
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poll_leave(&desc);
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poll_destroydesc(&desc);
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goto leave;
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}
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MUTEX_RELEASE(&pair->mutex);
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error = poll_dowait(&desc, 0);
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poll_leave(&desc);
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poll_destroydesc(&desc);
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MUTEX_ACQUIRE(&pair->mutex, false);
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if (error)
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goto leave;
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}
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localsocket_t *peer = pair->client == localsocket ? pair->server : pair->client;
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if (peer == NULL) {
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error = EPIPE;
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goto leave;
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}
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*sendcount = ringbuffer_write(&peer->ringbuffer, buffer, count);
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__assert(*sendcount > 0);
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// signal that there is data to read for any threads blocked on the peer socket
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poll_event(&peer->socket.pollheader, POLLIN);
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leave:
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if (pair)
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MUTEX_RELEASE(&pair->mutex);
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MUTEX_RELEASE(&socket->mutex);
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return error;
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}
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static int localsock_recv(socket_t *socket, sockaddr_t *addr, void *buffer, size_t count, uintmax_t flags, size_t *recvcount) {
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localsocket_t *localsocket = (localsocket_t *)socket;
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MUTEX_ACQUIRE(&socket->mutex, false);
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int error;
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localpair_t *pair = localsocket->pair;
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// socket not connected
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if (pair == NULL) {
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error = ENOTCONN;
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goto leave;
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}
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MUTEX_ACQUIRE(&pair->mutex, false);
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// check/wait for data
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for (;;) {
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polldesc_t desc = {0};
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error = poll_initdesc(&desc, 1);
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if (error)
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goto leave;
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// if the client has closed this will return POLLHUP
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int revents = internalpoll(socket, &desc.data[0], POLLIN);
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if (revents) {
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poll_leave(&desc);
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poll_destroydesc(&desc);
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break;
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}
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if (flags & V_FFLAGS_NONBLOCKING) {
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error = EAGAIN;
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poll_leave(&desc);
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poll_destroydesc(&desc);
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goto leave;
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}
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MUTEX_RELEASE(&pair->mutex);
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error = poll_dowait(&desc, 0);
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poll_leave(&desc);
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poll_destroydesc(&desc);
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MUTEX_ACQUIRE(&pair->mutex, false);
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if (error)
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goto leave;
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}
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*recvcount = ringbuffer_read(&localsocket->ringbuffer, buffer, count);
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localsocket_t *peer = pair->client == localsocket ? pair->server : pair->client;
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// signal that there is space to write for any threads blocked on this socket
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if (peer && *recvcount)
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poll_event(&peer->socket.pollheader, POLLOUT);
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leave:
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if (pair)
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MUTEX_RELEASE(&pair->mutex);
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MUTEX_RELEASE(&socket->mutex);
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return error;
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}
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static int localsock_accept(socket_t *_server, socket_t *_clientconnection, sockaddr_t *addr, uintmax_t flags) {
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localsocket_t *server = (localsocket_t *)_server;
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localsocket_t *clientconnection = (localsocket_t *)_clientconnection;
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MUTEX_ACQUIRE(&server->socket.mutex, false);
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binding_t *binding = server->binding;
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int error;
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if (binding == NULL) {
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error = EINVAL;
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goto leave;
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}
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MUTEX_ACQUIRE(&server->binding->mutex, false);
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if (server->backlog == NULL) {
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error = EINVAL;
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goto leave;
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}
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localpair_t *pair = NULL;
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// check if there is anything in the backlog
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for (;;) {
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polldesc_t desc = {0};
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error = poll_initdesc(&desc, 1);
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if (error)
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goto leave;
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int revents = internalpoll(&server->socket, &desc.data[0], POLLIN);
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if (revents) {
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// there is something but we need to see if it is valid
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poll_leave(&desc);
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poll_destroydesc(&desc);
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pair = popbacklog(server);
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MUTEX_ACQUIRE(&pair->mutex, false);
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if (pair->client == NULL) {
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// client closed the connection, delete the pair and keep trying
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free(pair);
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continue;
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}
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break;
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}
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if (flags & V_FFLAGS_NONBLOCKING) {
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error = EAGAIN;
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poll_leave(&desc);
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poll_destroydesc(&desc);
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goto leave;
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}
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MUTEX_RELEASE(&binding->mutex);
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error = poll_dowait(&desc, 0);
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poll_leave(&desc);
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poll_destroydesc(&desc);
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if (error)
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goto leave;
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MUTEX_ACQUIRE(&binding->mutex, false);
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}
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// we have a valid pair and we have acquired the mutex already
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// configure the client connection. we don't lock it because it should only be
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// curretly accessible here anyways
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clientconnection->pair = pair;
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pair->server = clientconnection;
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printf("created clientconnection %p\n", clientconnection);
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// signal to the client that they can start sending data now
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poll_event(&pair->client->socket.pollheader, POLLOUT);
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MUTEX_RELEASE(&pair->mutex);
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||||
leave:
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if (binding)
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MUTEX_RELEASE(&binding->mutex);
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||||
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MUTEX_RELEASE(&server->socket.mutex);
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||||
return error;
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}
|
||||
|
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static int localsock_connect(socket_t *socket, sockaddr_t *addr, uintmax_t flags) {
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localsocket_t *localsocket = (localsocket_t *)socket;
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int error;
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vnode_t *refnode = NULL;
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vnode_t *result = NULL;
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||||
binding_t *binding = NULL;
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||||
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||||
MUTEX_ACQUIRE(&socket->mutex, false);
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||||
// listening/bound socket
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||||
if (localsocket->backlog || localsocket->binding) {
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||||
error = EOPNOTSUPP;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
// connected socket
|
||||
if (localsocket->pair) {
|
||||
error = EISCONN;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
// get the vnode specified in addr
|
||||
refnode = addr->path[0] == '/' ? sched_getroot() : sched_getcwd();
|
||||
error = vfs_lookup(&result, refnode, addr->path, NULL, 0);
|
||||
if (error)
|
||||
goto leave;
|
||||
|
||||
// check if its a socket node
|
||||
if (result->type != V_TYPE_SOCKET) {
|
||||
error = ENOTSOCK;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
// and if it has a valid binding
|
||||
binding = result->socketbinding;
|
||||
if (binding == NULL) {
|
||||
error = ECONNREFUSED;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
// and if the server has not closed the socket and is listening
|
||||
MUTEX_ACQUIRE(&binding->mutex, false);
|
||||
localsocket_t *server = binding->server;
|
||||
if (server == NULL || server->backlog == NULL) {
|
||||
error = ECONNREFUSED;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
// we have a listening socket! we have to add ourselves to the backlog now.
|
||||
|
||||
// check if there is space to add in the backlog
|
||||
for (;;) {
|
||||
polldesc_t desc = {0};
|
||||
error = poll_initdesc(&desc, 1);
|
||||
if (error)
|
||||
goto leave;
|
||||
|
||||
int revents = internalpoll(&server->socket, &desc.data[0], POLLOUT);
|
||||
|
||||
if (revents) {
|
||||
poll_leave(&desc);
|
||||
poll_destroydesc(&desc);
|
||||
break;
|
||||
}
|
||||
|
||||
if (flags & V_FFLAGS_NONBLOCKING) {
|
||||
error = EAGAIN;
|
||||
poll_leave(&desc);
|
||||
poll_destroydesc(&desc);
|
||||
goto leave;
|
||||
}
|
||||
|
||||
// to make sure the binding doesn't get destroyed once we stop locking it, reference the vnode
|
||||
VOP_HOLD(binding->vnode);
|
||||
MUTEX_RELEASE(&binding->mutex);
|
||||
|
||||
error = poll_dowait(&desc, 0);
|
||||
|
||||
poll_leave(&desc);
|
||||
poll_destroydesc(&desc);
|
||||
|
||||
if (error)
|
||||
goto leave;
|
||||
|
||||
MUTEX_ACQUIRE(&binding->mutex, false);
|
||||
if (binding->server == NULL) {
|
||||
// server closed while we waited!
|
||||
// release the vnode so it can get deleted and set the binding to NULL as we can't be sure on its state anymore.
|
||||
VOP_RELEASE(binding->vnode);
|
||||
binding = NULL;
|
||||
error = ECONNREFUSED;
|
||||
goto leave;
|
||||
}
|
||||
VOP_RELEASE(binding->vnode);
|
||||
}
|
||||
|
||||
localpair_t *pair = alloc(sizeof(localpair_t));
|
||||
if (pair == NULL) {
|
||||
error = ENOMEM;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
pair->server = server;
|
||||
pair->client = localsocket;
|
||||
MUTEX_INIT(&pair->mutex);
|
||||
MUTEX_ACQUIRE(&pair->mutex, false);
|
||||
|
||||
pushbacklog(server, pair);
|
||||
|
||||
// signal to the server they can accept() now
|
||||
poll_event(&server->socket.pollheader, POLLIN);
|
||||
|
||||
// we will not use any more binding related shared data, unlock it.
|
||||
// we still hold the lock over the pair, though. this will prevent both the server
|
||||
// being destroyed and accepting us before we're ready.
|
||||
// also NULL the binding to indicate that its state will be uncertain from now on.
|
||||
MUTEX_RELEASE(&binding->mutex);
|
||||
binding = NULL;
|
||||
|
||||
localsocket->pair = pair;
|
||||
|
||||
// if nonblocking, return success. the userspace/whatever will
|
||||
// poll() the client to know when they can send data or if the server gave up and closed
|
||||
if (flags & V_FFLAGS_NONBLOCKING) {
|
||||
error = 0;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
// otherwise, we will just do the same thing as userspace (but here)
|
||||
polldesc_t desc = {0};
|
||||
error = poll_initdesc(&desc, 1);
|
||||
if (error)
|
||||
goto leave;
|
||||
|
||||
int revents = internalpoll(socket, &desc.data[0], POLLOUT);
|
||||
__assert(revents == 0);
|
||||
|
||||
// release and wait. once we return, we will be connected.
|
||||
MUTEX_RELEASE(&pair->mutex);
|
||||
|
||||
error = poll_dowait(&desc, 0);
|
||||
|
||||
poll_leave(&desc);
|
||||
poll_destroydesc(&desc);
|
||||
|
||||
if (error)
|
||||
goto leave;
|
||||
|
||||
leave:
|
||||
if (binding)
|
||||
MUTEX_RELEASE(&binding->mutex);
|
||||
|
||||
if (result)
|
||||
VOP_RELEASE(result);
|
||||
|
||||
if (refnode)
|
||||
VOP_RELEASE(refnode);
|
||||
|
||||
MUTEX_RELEASE(&socket->mutex);
|
||||
return error;
|
||||
}
|
||||
|
||||
static int localsock_listen(socket_t *socket, int backlogsize) {
|
||||
localsocket_t *localsocket = (localsocket_t *)socket;
|
||||
MUTEX_ACQUIRE(&socket->mutex, false);
|
||||
|
||||
int error = 0;
|
||||
// already listening
|
||||
if (localsocket->backlog)
|
||||
goto leave;
|
||||
|
||||
// connected/unbound socket
|
||||
if (localsocket->pair || localsocket->binding == NULL) {
|
||||
error = EOPNOTSUPP;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
MUTEX_ACQUIRE(&localsocket->binding->mutex, false);
|
||||
|
||||
localsocket->backlog = alloc(sizeof(backlogsize) * sizeof(localpair_t));
|
||||
if (localsocket->backlog == NULL) {
|
||||
MUTEX_RELEASE(&localsocket->binding->mutex);
|
||||
error = ENOMEM;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
localsocket->backlogsize = backlogsize;
|
||||
|
||||
MUTEX_RELEASE(&localsocket->binding->mutex);
|
||||
|
||||
leave:
|
||||
MUTEX_RELEASE(&socket->mutex);
|
||||
return error;
|
||||
}
|
||||
|
||||
static void localsock_destroy(socket_t *socket) {
|
||||
localsocket_t *localsocket = (localsocket_t *)socket;
|
||||
|
||||
// disconnect the socket (connected/connecting sockets)
|
||||
localpair_t *pair = localsocket->pair;
|
||||
if (localsocket->pair) {
|
||||
MUTEX_ACQUIRE(&pair->mutex, false);
|
||||
localsocket_t **peerp;
|
||||
localsocket_t **ourp;
|
||||
|
||||
if (pair->server == localsocket) {
|
||||
peerp = &pair->client;
|
||||
ourp = &pair->server;
|
||||
} else if (pair->client == localsocket) {
|
||||
peerp = &pair->server;
|
||||
ourp = &pair->client;
|
||||
} else {
|
||||
printf("self: %p server: %p client: %p\n", socket, pair->server, pair->client);
|
||||
__assert(!"freeing socket which is neither client nor server");
|
||||
}
|
||||
|
||||
if (*peerp == NULL) {
|
||||
free(pair);
|
||||
} else {
|
||||
*ourp = NULL;
|
||||
MUTEX_RELEASE(&pair->mutex);
|
||||
}
|
||||
}
|
||||
|
||||
// leave binding (bound socket)
|
||||
binding_t *binding = localsocket->binding;
|
||||
if (binding) {
|
||||
MUTEX_ACQUIRE(&binding->mutex, false);
|
||||
__assert(binding->vnode);
|
||||
binding->server = NULL;
|
||||
MUTEX_RELEASE(&binding->mutex);
|
||||
VOP_RELEASE(binding->vnode);
|
||||
}
|
||||
|
||||
// destroy backlog (for listening sockets)
|
||||
if (localsocket->backlog) {
|
||||
for (int i = 0; i < localsocket->backlogsize; ++i) {
|
||||
localpair_t *pair = localsocket->backlog[i];
|
||||
if (pair == NULL)
|
||||
continue;
|
||||
|
||||
MUTEX_ACQUIRE(&pair->mutex, false);
|
||||
if (pair->client == NULL) {
|
||||
// client gave up
|
||||
free(pair);
|
||||
} else {
|
||||
// client still trying to connect
|
||||
pair->server = NULL;
|
||||
MUTEX_RELEASE(&pair->mutex);
|
||||
}
|
||||
}
|
||||
|
||||
free(localsocket->backlog);
|
||||
localsocket->backlog = NULL;
|
||||
}
|
||||
|
||||
poll_event(&socket->pollheader, POLLHUP);
|
||||
|
||||
// the peer only accesses the socket while the pair mutex is acquired
|
||||
// since its gone now, we don't have to worry about the other end accessing it
|
||||
|
||||
if (localsocket->bindpath)
|
||||
free(localsocket->bindpath);
|
||||
|
||||
ringbuffer_destroy(&localsocket->ringbuffer);
|
||||
free(socket);
|
||||
}
|
||||
|
||||
static int localsock_bind(socket_t *socket, sockaddr_t *addr) {
|
||||
MUTEX_ACQUIRE(&socket->mutex, false);
|
||||
int error;
|
||||
char *path = NULL;
|
||||
vnode_t *refnode = NULL;
|
||||
|
||||
binding_t *binding = alloc(sizeof(binding_t));
|
||||
if (binding == NULL)
|
||||
return ENOMEM;
|
||||
|
||||
path = alloc(strlen(addr->path) + 1);
|
||||
if (path == NULL) {
|
||||
error = ENOMEM;
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
strcpy(path, addr->path);
|
||||
|
||||
refnode = *path == '/' ? sched_getroot() : sched_getcwd();
|
||||
vattr_t attr = {
|
||||
.mode = _cpu()->thread->proc ? UMASK(0777) : 0644,
|
||||
.gid = _cpu()->thread->proc ? _cpu()->thread->proc->cred.gid : 0,
|
||||
.uid = _cpu()->thread->proc ? _cpu()->thread->proc->cred.uid : 0
|
||||
};
|
||||
|
||||
vnode_t *vnode;
|
||||
error = vfs_create(refnode, path, &attr, V_TYPE_SOCKET, &vnode);
|
||||
if (error)
|
||||
goto cleanup;
|
||||
|
||||
localsocket_t *localsocket = (localsocket_t *)socket;
|
||||
binding->vnode = vnode;
|
||||
binding->server = localsocket;
|
||||
MUTEX_INIT(&binding->mutex);
|
||||
|
||||
VOP_LOCK(vnode);
|
||||
vnode->socketbinding = binding;
|
||||
VOP_UNLOCK(vnode);
|
||||
localsocket->binding = binding;
|
||||
|
||||
cleanup:
|
||||
if (error) {
|
||||
free(path);
|
||||
if (binding)
|
||||
free(binding);
|
||||
}
|
||||
|
||||
if (refnode) {
|
||||
VOP_RELEASE(refnode);
|
||||
}
|
||||
|
||||
MUTEX_RELEASE(&socket->mutex);
|
||||
return error;
|
||||
}
|
||||
|
||||
// only called on vnode remove (vfs_inactive)
|
||||
void localsock_leavebinding(vnode_t *vnode) {
|
||||
binding_t *binding = vnode->socketbinding;
|
||||
MUTEX_ACQUIRE(&binding->mutex, false);
|
||||
if (binding->server) {
|
||||
// server socket still exists, so don't free the structure and only remove the vnode pointer from it
|
||||
binding->vnode = NULL;
|
||||
MUTEX_RELEASE(&binding->mutex);
|
||||
} else {
|
||||
// server socket is gone, destroy the binding structure
|
||||
free(binding);
|
||||
}
|
||||
|
||||
// not really needed but added just to make sure
|
||||
vnode->socketbinding = NULL;
|
||||
}
|
||||
|
||||
static socketops_t socketops = {
|
||||
.bind = localsock_bind,
|
||||
.listen = localsock_listen,
|
||||
.connect = localsock_connect,
|
||||
.accept = localsock_accept,
|
||||
.send = localsock_send,
|
||||
.recv = localsock_recv,
|
||||
.destroy = localsock_destroy,
|
||||
.poll = localsock_poll
|
||||
};
|
||||
|
||||
socket_t *localsock_createsocket() {
|
||||
// XXX possibly move this to a slab?
|
||||
localsocket_t *socket = alloc(sizeof(localsocket_t));
|
||||
if (socket == NULL)
|
||||
return NULL;
|
||||
|
||||
// TODO would waste resources on listening sockets
|
||||
if (ringbuffer_init(&socket->ringbuffer, SOCKET_BUFFER)) {
|
||||
free(socket);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
socket->socket.ops = &socketops;
|
||||
|
||||
return (socket_t *)socket;
|
||||
}
|
||||
Reference in New Issue
Block a user