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/* The client: a terminal in raw mode and a socket. It decodes nothing and
* lays out nothing — it forwards bytes and paints what it is sent, so a bug
* here can cost you a frame, never a session. */
#define _GNU_SOURCE
#include "server.h"
#include <errno.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
#include "proto.h"
#define TERM_ENTER \
"\x1b[?1049h\x1b[0m\x1b[2J" \
"\x1b[?1002h\x1b[?1006h" \
"\x1b[?1004h" \
"\x1b[?2004h" \
"\x1b[>1u"
#define TERM_LEAVE \
"\x1b[<u\x1b[?2004l\x1b[?1004l\x1b[?1006l\x1b[?1002l" \
"\x1b[?25h\x1b[0m\x1b[?1049l"
static volatile sig_atomic_t g_winch = 0, g_quit = 0;
static struct termios g_saved;
static bool g_saved_ok = false;
static void on_sig(int s) {
if (s == SIGWINCH) g_winch = 1;
else g_quit = 1;
}
static void restore(void) {
if (g_saved_ok) tcsetattr(STDIN_FILENO, TCSAFLUSH, &g_saved);
ssize_t r = write(STDOUT_FILENO, TERM_LEAVE, strlen(TERM_LEAVE));
(void)r;
}
static void term_size(uint16_t *cols, uint16_t *rows) {
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col && ws.ws_row) {
*cols = ws.ws_col;
*rows = ws.ws_row;
} else {
*cols = 80;
*rows = 24;
}
}
static void send_size(int fd, uint8_t type, uint16_t cols, uint16_t rows) {
uint8_t b[4] = {(uint8_t)(cols >> 8), (uint8_t)cols, (uint8_t)(rows >> 8),
(uint8_t)rows};
msg_send(fd, type, b, sizeof b);
}
static void write_all(int fd, const void *buf, size_t len) {
size_t off = 0;
while (off < len) {
ssize_t w = write(fd, (const char *)buf + off, len - off);
if (w <= 0) {
if (errno == EINTR) continue;
return;
}
off += (size_t)w;
}
}
int client_run(int fd) {
uint16_t cols, rows;
term_size(&cols, &rows);
if (tcgetattr(STDIN_FILENO, &g_saved) != 0) {
fprintf(stderr, "sl0ptty: not a terminal\n");
return 1;
}
g_saved_ok = true;
struct termios t = g_saved;
cfmakeraw(&t);
t.c_cc[VMIN] = 1;
t.c_cc[VTIME] = 0;
tcsetattr(STDIN_FILENO, TCSAFLUSH, &t);
atexit(restore);
write_all(STDOUT_FILENO, TERM_ENTER, strlen(TERM_ENTER));
struct sigaction sa = {.sa_handler = on_sig};
sigaction(SIGWINCH, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGHUP, &sa, NULL);
signal(SIGPIPE, SIG_IGN);
send_size(fd, MSG_HELLO, cols, rows);
msg_reader_t reader;
msg_reader_init(&reader);
int exit_reason = -1;
while (!g_quit) {
struct pollfd pfds[2] = {
{.fd = STDIN_FILENO, .events = POLLIN},
{.fd = fd, .events = POLLIN},
};
int n = poll(pfds, 2, -1);
if (g_winch) {
g_winch = 0;
term_size(&cols, &rows);
send_size(fd, MSG_RESIZE, cols, rows);
}
if (n < 0) {
if (errno == EINTR) continue;
break;
}
if (pfds[0].revents & POLLIN) {
uint8_t buf[65536];
ssize_t got = read(STDIN_FILENO, buf, sizeof buf);
if (got > 0 && msg_send(fd, MSG_INPUT, buf, (size_t)got) != 0) break;
if (got == 0) break;
}
if (pfds[1].revents & (POLLIN | POLLHUP)) {
uint8_t buf[65536];
ssize_t got = read(fd, buf, sizeof buf);
if (got <= 0) break;
msg_reader_feed(&reader, buf, (size_t)got);
msg_t m;
while (msg_reader_next(&reader, &m)) {
if (m.type == MSG_OUTPUT) {
write_all(STDOUT_FILENO, m.data, m.len);
} else if (m.type == MSG_EXIT) {
exit_reason = m.len ? m.data[0] : EXIT_SESSION_ENDED;
g_quit = 1;
break;
}
}
}
}
msg_reader_free(&reader);
close(fd);
restore();
g_saved_ok = false;
if (exit_reason == EXIT_DETACHED) fprintf(stderr, "[detached]\n");
else if (exit_reason == EXIT_REPLACED) fprintf(stderr, "[replaced by another client]\n");
return 0;
}
/* One-shot control request: connect, ask, print the answer. */
int client_control(int fd, const char *json) {
if (msg_send(fd, MSG_CMD, json, strlen(json)) != 0) return 1;
msg_reader_t reader;
msg_reader_init(&reader);
uint8_t buf[65536];
int rc = 1;
for (;;) {
ssize_t got = read(fd, buf, sizeof buf);
if (got <= 0) break;
msg_reader_feed(&reader, buf, (size_t)got);
msg_t m;
bool done = false;
while (msg_reader_next(&reader, &m)) {
if (m.type == MSG_REPLY) {
fwrite(m.data, 1, m.len, stdout);
fputc('\n', stdout);
rc = 0;
done = true;
break;
}
}
if (done) break;
}
msg_reader_free(&reader);
close(fd);
return rc;
}
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