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#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>
#include "runes.h"
#include "socket.h"
static int runes_socket_open(RunesSocket *sock);
static void runes_socket_close(RunesSocket *sock);
static void runes_socket_accept(RunesTerm *t);
static int runes_socket_handle_request(RunesTerm *t);
void runes_socket_init(RunesSocket *sock, RunesLoop *loop)
{
sock->loop = loop;
sock->name = runes_get_socket_name();
sock->sock = runes_socket_open(sock);
runes_socket_init_loop(sock, loop);
}
void runes_socket_init_loop(RunesSocket *sock, RunesLoop *loop)
{
runes_loop_start_work(loop, (RunesTerm *)sock, runes_socket_accept,
runes_socket_handle_request);
}
void runes_socket_cleanup(RunesSocket *sock)
{
runes_socket_close(sock);
free(sock->name);
}
static int runes_socket_open(RunesSocket *sock)
{
char *dir, *slash;
int s;
struct sockaddr_un server;
if (strlen(sock->name) + 1 > MAX_SOCKET_PATH_LEN) {
runes_die("socket path %s is too long\n", sock->name);
}
dir = strdup(sock->name);
slash = strrchr(dir, '/');
if (slash == NULL) {
runes_die("socket path %s must be an absolute path\n", sock->name);
}
*slash = '\0';
runes_mkdir_p(dir);
free(dir);
unlink(sock->name);
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0) {
runes_die("couldn't create socket: %s\n", strerror(errno));
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, sock->name);
if (bind(s, (struct sockaddr*)(&server), sizeof(struct sockaddr_un))) {
runes_die("couldn't bind to socket %s: %s\n", sock->name,
strerror(errno));
}
if (chmod(sock->name, S_IRUSR|S_IWUSR)) {
runes_die("couldn't chmod socket %s: %s\n", sock->name,
strerror(errno));
}
if (listen(s, 5)) {
runes_die("couldn't listen on socket %s: %s\n", sock->name,
strerror(errno));
}
return s;
}
static void runes_socket_close(RunesSocket *sock)
{
close(sock->sock);
unlink(sock->name);
}
static void runes_socket_accept(RunesTerm *t)
{
RunesSocket *sock = (RunesSocket *)t;
struct sockaddr_un client;
socklen_t len = sizeof(client);
sock->client_sock = accept(sock->sock, (struct sockaddr*)(&client), &len);
}
static int runes_socket_handle_request(RunesTerm *t)
{
RunesSocket *sock = (RunesSocket *)t;
ssize_t bytes;
uint32_t argc, argv_len;
char **argv, *argv_buf;
if (sock->client_sock < 0) {
runes_die("couldn't accept connection: %s", strerror(errno));
}
bytes = recv(sock->client_sock, (void*)(&argc), sizeof(argc), 0);
if (bytes < (int)sizeof(argc)) {
runes_warn("invalid message received: got %d bytes, expected 4\n",
bytes);
close(sock->client_sock);
return 1;
}
argc = ntohl(argc);
if (argc > 1024) {
runes_warn("invalid message received: argc = %d, must be < 1024\n",
argc);
close(sock->client_sock);
return 1;
}
argv = malloc(argc * sizeof(char*));
bytes = recv(sock->client_sock, (void*)(&argv_len), sizeof(argv_len), 0);
if (bytes < (int)sizeof(argc)) {
runes_warn("invalid message received: got %d bytes, expected 4\n",
bytes);
close(sock->client_sock);
free(argv);
return 1;
}
argv_len = ntohl(argv_len);
if (argv_len > 131072) {
runes_warn("invalid message received: argv_len = %d, must be < %d\n",
argv_len, 131072);
close(sock->client_sock);
free(argv);
return 1;
}
argv_buf = malloc(argv_len + 1);
bytes = recv(sock->client_sock, argv_buf, argv_len, 0);
if (bytes < argv_len) {
runes_warn("invalid message received: got %d bytes, expected %d\n",
bytes, argv_len);
close(sock->client_sock);
free(argv);
free(argv_buf);
return 1;
}
close(sock->client_sock);
if (argc > 0) {
size_t offset = 0;
int i;
RunesTerm *t;
for (i = 0; i < (int)argc; ++i) {
char *next_null;
if (offset >= argv_len) {
runes_die("args in argv_buf don't match argc of %d\n", argc);
}
argv[i] = argv_buf + offset;
next_null = memchr(argv_buf + offset, '\0', argv_len - offset);
if (!next_null) {
runes_die("args in argv_buf don't match argc of %d\n", argc);
}
offset = next_null - argv_buf + 1;
}
t = calloc(1, sizeof(RunesTerm));
runes_term_init(t, sock->loop, argc, argv);
}
free(argv);
free(argv_buf);
return 1;
}
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