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-rw-r--r--src/protocol.c337
1 files changed, 127 insertions, 210 deletions
diff --git a/src/protocol.c b/src/protocol.c
index 4b832ab..ca1e086 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -1,15 +1,13 @@
#include <errno.h>
#include <json.h>
#include <libwebsockets.h>
-#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/wait.h>
+#include "pty.h"
#include "server.h"
-#include "terminal.h"
#include "utils.h"
// initial message list
@@ -37,34 +35,22 @@ static int send_initial_message(struct lws *wsi, int index) {
return lws_write(wsi, p, (size_t)n, LWS_WRITE_BINARY);
}
-static bool parse_window_size(struct pss_tty *pss, int *cols, int *rows) {
- char json[pss->len];
- strncpy(json, pss->buffer + 1, pss->len - 1);
- json[pss->len - 1] = '\0';
-
- json_object *obj = json_tokener_parse(json);
+static json_object *parse_window_size(const char *buf, size_t len, uint16_t *cols, uint16_t *rows) {
+ json_tokener *tok = json_tokener_new();
+ json_object *obj = json_tokener_parse_ex(tok, buf, len);
struct json_object *o = NULL;
- if (!json_object_object_get_ex(obj, "columns", &o)) {
- lwsl_err("columns field not exists, json: %s\n", json);
- return false;
- }
- *cols = json_object_get_int(o);
- if (!json_object_object_get_ex(obj, "rows", &o)) {
- lwsl_err("rows field not exists, json: %s\n", json);
- return false;
- }
- *rows = json_object_get_int(o);
- json_object_put(obj);
+ if (json_object_object_get_ex(obj, "columns", &o)) *cols = (uint16_t)json_object_get_int(o);
+ if (json_object_object_get_ex(obj, "rows", &o)) *rows = (uint16_t)json_object_get_int(o);
- return true;
+ json_tokener_free(tok);
+ return obj;
}
static bool check_host_origin(struct lws *wsi) {
- int origin_length = lws_hdr_total_length(wsi, WSI_TOKEN_ORIGIN);
- char buf[origin_length + 1];
+ char buf[256];
memset(buf, 0, sizeof(buf));
- int len = lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_ORIGIN);
+ int len = lws_hdr_copy(wsi, buf, (int)sizeof(buf), WSI_TOKEN_ORIGIN);
if (len <= 0) {
return false;
}
@@ -78,154 +64,123 @@ static bool check_host_origin(struct lws *wsi) {
sprintf(buf, "%s:%d", address, port);
}
- int host_length = lws_hdr_total_length(wsi, WSI_TOKEN_HOST);
- if (host_length != strlen(buf)) return false;
- char host_buf[host_length + 1];
+ char host_buf[256];
memset(host_buf, 0, sizeof(host_buf));
- len = lws_hdr_copy(wsi, host_buf, sizeof(host_buf), WSI_TOKEN_HOST);
+ len = lws_hdr_copy(wsi, host_buf, (int)sizeof(host_buf), WSI_TOKEN_HOST);
return len > 0 && strcasecmp(buf, host_buf) == 0;
}
-static void close_cb(uv_handle_t *handle) {
- struct pty_proc *proc = container_of((uv_pipe_t *)handle, struct pty_proc, pipe);
- free(proc);
-}
-
-static void pty_proc_free(struct pty_proc *proc) {
- uv_read_stop((uv_stream_t *)&proc->pipe);
- close(proc->pty);
- if (proc->pty_buffer != NULL) {
- free(proc->pty_buffer);
- proc->pty_buffer = NULL;
- }
- for (int i = 0; i < proc->argc; i++) {
- free(proc->args[i]);
- }
- uv_close((uv_handle_t *)&proc->pipe, close_cb);
-}
-
-static void alloc_cb(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
- buf->base = xmalloc(suggested_size);
- buf->len = suggested_size;
-}
-
-static void read_cb(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) {
- struct pss_tty *pss = (struct pss_tty *)stream->data;
- struct pty_proc *proc = pss->proc;
- proc->pty_len = nread;
-
- uv_read_stop(stream);
-
- if (nread == UV_ENOBUFS || nread == 0) return;
- if (nread > 0) {
- proc->pty_buffer = xmalloc(LWS_PRE + 1 + (size_t)nread);
- memcpy(proc->pty_buffer + LWS_PRE + 1, buf->base, (size_t)nread);
- } else {
- proc->pty_buffer = NULL;
- if (nread != UV_EOF) {
- proc->err_count++;
- lwsl_err("read_cb: %s (%s)\n", uv_err_name(nread), uv_strerror(nread));
- }
- }
- free(buf->base);
+static void process_read_cb(void *ctx, pty_buf_t *buf, bool eof) {
+ struct pss_tty *pss = (struct pss_tty *)ctx;
+ if (eof && !process_running(pss->process))
+ pss->lws_close_status = pss->process->exit_code == 0 ? 1000 : 1006;
+ else
+ pss->pty_buf = buf;
lws_callback_on_writable(pss->wsi);
}
-static void child_cb(uv_signal_t *handle, int signum) {
- pid_t pid;
- int stat;
-
- struct pty_proc *proc;
- LIST_HEAD(proc, pty_proc) *procs = handle->data;
- LIST_FOREACH(proc, procs, entry) {
- do
- pid = waitpid(proc->pid, &stat, WNOHANG);
- while (pid == -1 && errno == EINTR);
-
- if (pid <= 0) continue;
-
- if (WIFEXITED(stat)) {
- proc->status = WEXITSTATUS(stat);
- lwsl_notice("process exited with code %d, pid: %d\n", proc->status, proc->pid);
- } else if (WIFSIGNALED(stat)) {
- int sig = WTERMSIG(stat);
- char sig_name[20];
-
- proc->status = 128 + sig;
- get_sig_name(sig, sig_name, sizeof(sig_name));
- lwsl_notice("process killed with signal %d (%s), pid: %d\n", sig, sig_name, proc->pid);
- }
-
- LIST_REMOVE(proc, entry);
- if (proc->state == STATE_KILL) {
- pty_proc_free(proc);
- } else {
- proc->state = STATE_EXIT;
- }
+static void process_exit_cb(void *ctx, pty_process *process) {
+ struct pss_tty *pss = (struct pss_tty *)ctx;
+ pss->process = NULL;
+ if (process->killed) {
+ lwsl_notice("process killed with signal %d, pid: %d\n", process->exit_signal, process->pid);
+ } else {
+ lwsl_notice("process exited with code %d, pid: %d\n", process->exit_code, process->pid);
+ pss->lws_close_status = process->exit_code == 0 ? 1000 : 1006;
+ lws_callback_on_writable(pss->wsi);
}
}
-static int spawn_process(struct pss_tty *pss) {
- struct pty_proc *proc = pss->proc;
- // append url args to arguments
- char *argv[server->argc + proc->argc + 1];
+static char **build_args(struct pss_tty *pss) {
int i, n = 0;
+ char **argv = xmalloc((server->argc + pss->argc + 1) * sizeof(char *));
+
for (i = 0; i < server->argc; i++) {
argv[n++] = server->argv[i];
}
- for (i = 0; i < proc->argc; i++) {
- argv[n++] = proc->args[i];
+
+ for (i = 0; i < pss->argc; i++) {
+ argv[n++] = pss->args[i];
}
- argv[n] = NULL;
- uv_signal_start(&server->watcher, child_cb, SIGCHLD);
+ argv[n] = NULL;
- // ensure the lws socket fd close-on-exec
- fd_set_cloexec(lws_get_socket_fd(pss->wsi));
+ return argv;
+}
- // create process with pseudo-tty
- proc->pid = pty_fork(&proc->pty, argv[0], argv, server->terminal_type);
- if (proc->pid < 0) {
- lwsl_err("pty_fork: %d (%s)\n", errno, strerror(errno));
- return 1;
+static char **build_env(struct pss_tty *pss) {
+ int i = 0, n = 2;
+ char **envp = xmalloc(n * sizeof(char *));
+
+ // TERM
+ envp[i] = xmalloc(36);
+ snprintf(envp[i], 36, "TERM=%s", server->terminal_type);
+ i++;
+
+ // TTYD_USER
+ if (strlen(pss->user) > 0) {
+ envp = xrealloc(envp, (++n) * sizeof(char *));
+ envp[i] = xmalloc(40);
+ snprintf(envp[i], 40, "TTYD_USER=%s", pss->user);
+ i++;
}
- lwsl_notice("started process, pid: %d\n", proc->pid);
+ envp[i] = NULL;
- proc->pipe.data = pss;
- uv_pipe_open(&proc->pipe, proc->pty);
+ return envp;
+}
+static bool spawn_process(struct pss_tty *pss, uint16_t columns, uint16_t rows) {
+ pty_process *process = process_init((void *)pss, server->loop, build_args(pss), build_env(pss));
+ if (server->cwd != NULL) process->cwd = strdup(server->cwd);
+ if (columns > 0) process->columns = columns;
+ if (rows > 0) process->rows = rows;
+ if (pty_spawn(process, process_read_cb, process_exit_cb) != 0) {
+ lwsl_err("pty_spawn: %d (%s)\n", errno, strerror(errno));
+ process_free(process);
+ return false;
+ }
+ lwsl_notice("started process, pid: %d\n", process->pid);
+ pss->process = process;
lws_callback_on_writable(pss->wsi);
- return 0;
+ return true;
}
-static void kill_process(struct pty_proc *proc) {
- if (proc->pid <= 0) return;
+static void wsi_output(struct lws *wsi, pty_buf_t *buf) {
+ if (buf == NULL) return;
+ char *message = xmalloc(LWS_PRE + 1 + buf->len);
+ char *ptr = message + LWS_PRE;
- pid_t pid = proc->pid;
- int sig = server->sig_code;
- char *sig_name = server->sig_name;
+ *ptr = OUTPUT;
+ memcpy(ptr + 1, buf->base, buf->len);
+ size_t n = buf->len + 1;
- lwsl_notice("killing process %d with signal: %d (%s)\n", pid, sig, sig_name);
- int pgid = getpgid(pid);
- if (uv_kill(pgid > 0 ? -pgid : pid, sig) != 0) {
- lwsl_err("kill: %d, errno: %d (%s)\n", pid, errno, strerror(errno));
+ if (lws_write(wsi, (unsigned char *)ptr, n, LWS_WRITE_BINARY) < n) {
+ lwsl_err("write OUTPUT to WS\n");
}
+
+ free(message);
}
-static void write_cb(uv_write_t *req, int status) {
- if (status != 0) lwsl_warn("uv_write callback returned status: %d\n", status);
- free(req->data);
- free(req);
+static bool check_auth(struct lws *wsi, struct pss_tty *pss) {
+ if (server->auth_header != NULL) {
+ return lws_hdr_custom_copy(wsi, pss->user, sizeof(pss->user), server->auth_header, strlen(server->auth_header)) > 0;
+ }
+
+ if (server->credential != NULL) {
+ char buf[256];
+ size_t n = lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_HTTP_AUTHORIZATION);
+ return n >= 7 && strstr(buf, "Basic ") && !strcmp(buf + 6, server->credential);
+ }
+
+ return true;
}
-int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in,
- size_t len) {
+int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len) {
struct pss_tty *pss = (struct pss_tty *)user;
- struct pty_proc *proc;
char buf[256];
size_t n = 0;
@@ -239,13 +194,14 @@ int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user,
lwsl_warn("refuse to serve WS client due to the --max-clients option.\n");
return 1;
}
+ if (!check_auth(wsi, pss)) return 1;
n = lws_hdr_copy(wsi, pss->path, sizeof(pss->path), WSI_TOKEN_GET_URI);
#if defined(LWS_ROLE_H2)
if (n <= 0) n = lws_hdr_copy(wsi, pss->path, sizeof(pss->path), WSI_TOKEN_HTTP_COLON_PATH);
#endif
if (strncmp(pss->path, endpoints.ws, n) != 0) {
- lwsl_warn("refuse to serve WS client for illegal ws path: %s\n", buf);
+ lwsl_warn("refuse to serve WS client for illegal ws path: %s\n", pss->path);
return 1;
}
@@ -259,46 +215,31 @@ int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user,
case LWS_CALLBACK_ESTABLISHED:
pss->initialized = false;
- pss->initial_cmd_index = 0;
pss->authenticated = false;
pss->wsi = wsi;
- pss->buffer = NULL;
-
- pss->proc = proc = xmalloc(sizeof(struct pty_proc));
- memset(proc, 0, sizeof(struct pty_proc));
- proc->status = -1;
- proc->state = STATE_INIT;
- uv_pipe_init(server->loop, &proc->pipe, 0);
+ pss->lws_close_status = LWS_CLOSE_STATUS_NOSTATUS;
if (server->url_arg) {
while (lws_hdr_copy_fragment(wsi, buf, sizeof(buf), WSI_TOKEN_HTTP_URI_ARGS, n++) > 0) {
if (strncmp(buf, "arg=", 4) == 0) {
- proc->args = xrealloc(proc->args, (proc->argc + 1) * sizeof(char *));
- proc->args[proc->argc] = strdup(&buf[4]);
- proc->argc++;
+ pss->args = xrealloc(pss->args, (pss->argc + 1) * sizeof(char *));
+ pss->args[pss->argc] = strdup(&buf[4]);
+ pss->argc++;
}
}
}
- LIST_INSERT_HEAD(&server->procs, proc, entry);
server->client_count++;
-#if LWS_LIBRARY_VERSION_NUMBER >= 2004000
lws_get_peer_simple(lws_get_network_wsi(wsi), pss->address, sizeof(pss->address));
-#else
- char name[100];
- lws_get_peer_addresses(wsi, lws_get_socket_fd(wsi), name, sizeof(name), pss->address,
- sizeof(pss->address));
-#endif
lwsl_notice("WS %s - %s, clients: %d\n", pss->path, pss->address, server->client_count);
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
- proc = pss->proc;
if (!pss->initialized) {
if (pss->initial_cmd_index == sizeof(initial_cmds)) {
pss->initialized = true;
- uv_read_start((uv_stream_t *)&proc->pipe, alloc_cb, read_cb);
+ pty_resume(pss->process);
break;
}
if (send_initial_message(wsi, pss->initial_cmd_index) < 0) {
@@ -311,26 +252,17 @@ int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user,
break;
}
- // read error or client exited, close connection
- if (proc->status == 0 || proc->pty_len == UV_EOF) {
- lws_close_reason(wsi, LWS_CLOSE_STATUS_NORMAL, NULL, 0);
+ if (pss->lws_close_status > LWS_CLOSE_STATUS_NOSTATUS) {
+ lws_close_reason(wsi, pss->lws_close_status, NULL, 0);
return 1;
- } else if (proc->status > 0 || (proc->pty_len < 0 && proc->err_count == MAX_READ_RETRY)) {
- lws_close_reason(wsi, LWS_CLOSE_STATUS_UNEXPECTED_CONDITION, NULL, 0);
- return -1;
}
- if (proc->pty_buffer != NULL && proc->pty_len > 0) {
- proc->pty_buffer[LWS_PRE] = OUTPUT;
- n = (size_t)(proc->pty_len + 1);
- if (lws_write(wsi, (unsigned char *)proc->pty_buffer + LWS_PRE, n, LWS_WRITE_BINARY) < n) {
- lwsl_err("write OUTPUT to WS\n");
- }
- free(proc->pty_buffer);
- proc->pty_buffer = NULL;
+ if (pss->pty_buf != NULL) {
+ wsi_output(wsi, pss->pty_buf);
+ pty_buf_free(pss->pty_buf);
+ pss->pty_buf = NULL;
+ pty_resume(pss->process);
}
-
- uv_read_start((uv_stream_t *)&proc->pipe, alloc_cb, read_cb);
break;
case LWS_CALLBACK_RECEIVE:
@@ -357,49 +289,32 @@ int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user,
return 0;
}
- proc = pss->proc;
switch (command) {
case INPUT:
- if (proc->pty == 0) break;
if (server->readonly) break;
-
- char *data = xmalloc(pss->len - 1);
- memcpy(data, pss->buffer + 1, pss->len - 1);
-
- uv_buf_t b = {data, pss->len - 1};
- uv_write_t *req = xmalloc(sizeof(uv_write_t));
- req->data = data;
-
- int err = uv_write(req, (uv_stream_t *)&proc->pipe, &b, 1, write_cb);
+ int err = pty_write(pss->process, pty_buf_init(pss->buffer + 1, pss->len - 1));
if (err) {
lwsl_err("uv_write: %s (%s)\n", uv_err_name(err), uv_strerror(err));
return -1;
}
break;
- case RESIZE_TERMINAL: {
- int cols, rows;
- if (parse_window_size(pss, &cols, &rows)) {
- if (pty_resize(proc->pty, cols, rows) < 0) {
- lwsl_err("pty_resize: %d (%s)\n", errno, strerror(errno));
- }
- }
- } break;
+ case RESIZE_TERMINAL:
+ json_object_put(
+ parse_window_size(pss->buffer + 1, pss->len - 1, &pss->process->columns, &pss->process->rows));
+ pty_resize(pss->process);
+ break;
case PAUSE:
- if (proc->state == STATE_INIT) {
- uv_read_stop((uv_stream_t *)&proc->pipe);
- proc->state = STATE_PAUSE;
- }
+ pty_pause(pss->process);
break;
case RESUME:
- if (proc->state == STATE_PAUSE) {
- uv_read_start((uv_stream_t *)&proc->pipe, alloc_cb, read_cb);
- proc->state = STATE_INIT;
- }
+ pty_resume(pss->process);
break;
case JSON_DATA:
- if (proc->pid > 0) break;
+ if (pss->process != NULL) break;
+ uint16_t columns = 0;
+ uint16_t rows = 0;
+ json_object *obj = parse_window_size(pss->buffer, pss->len, &columns, &rows);
if (server->credential != NULL) {
- json_object *obj = json_tokener_parse(pss->buffer);
struct json_object *o = NULL;
if (json_object_object_get_ex(obj, "AuthToken", &o)) {
const char *token = json_object_get_string(o);
@@ -409,11 +324,13 @@ int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user,
lwsl_warn("WS authentication failed with token: %s\n", token);
}
if (!pss->authenticated) {
+ json_object_put(obj);
lws_close_reason(wsi, LWS_CLOSE_STATUS_POLICY_VIOLATION, NULL, 0);
return -1;
}
}
- if (spawn_process(pss) != 0) return 1;
+ json_object_put(obj);
+ if (!spawn_process(pss, columns, rows)) return 1;
break;
default:
lwsl_warn("ignored unknown message type: %c\n", command);
@@ -434,14 +351,14 @@ int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user,
if (pss->buffer != NULL) {
free(pss->buffer);
}
+ for (int i = 0; i < pss->argc; i++) {
+ free(pss->args[i]);
+ }
- proc = pss->proc;
- if (proc->state == STATE_EXIT) {
- pty_proc_free(proc);
- } else {
- proc->state = STATE_KILL;
- uv_read_stop((uv_stream_t *)&proc->pipe);
- kill_process(proc);
+ if (process_running(pss->process)) {
+ pty_pause(pss->process);
+ lwsl_notice("killing process, pid: %d\n", pss->process->pid);
+ pty_kill(pss->process, server->sig_code);
}
if (server->once && server->client_count == 0) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 13:54:11 +0000