/* Expands tildes in the file name. Based on code from ssh/misc.c. */
char *
tilde_expand(const char *filename1)
{
const char *filename, *path, *sep;
char user[128], *out;
struct passwd *pw;
u_int len, slash;
int rv;
if (*filename1 != '~')
goto no_change;
filename = filename1 + 1;
path = strchr(filename, '/');
if (path != NULL && path > filename) { /* ~user/path */
slash = path - filename;
if (slash > sizeof(user) - 1)
goto no_change;
memcpy(user, filename, slash);
user[slash] = '\0';
if ((pw = getpwnam(user)) == NULL)
goto no_change;
} else if ((pw = getpwuid(getuid())) == NULL) /* ~/path */
goto no_change;
/* Make sure directory has a trailing '/' */
len = strlen(pw->pw_dir);
if (len == 0 || pw->pw_dir[len - 1] != '/')
sep = "/";
else
sep = "";
/* Skip leading '/' from specified path */
if (path != NULL)
filename = path + 1;
if ((rv = asprintf(&out, "%s%s%s", pw->pw_dir, sep, filename)) == -1)
cu_err(1, "asprintf");
if (rv >= MAXPATHLEN) {
free(out);
goto no_change;
}
return (out);
no_change:
out = strdup(filename1);
if (out == NULL)
cu_err(1, "strdup");
return (out);
}
void
connect_command(void)
{
const char *cmd;
pid_t pid;
/*
* Fork a program with:
* 0 <-> remote tty in
* 1 <-> remote tty out
* 2 <-> local tty stderr
*/
cmd = get_input("Local command?");
if (cmd == NULL || *cmd == '\0')
return;
restore_termios();
switch (pid = fork()) {
case -1:
cu_err(1, "fork");
case 0:
if (signal(SIGINT, SIG_DFL) == SIG_ERR)
_exit(1);
if (signal(SIGQUIT, SIG_DFL) == SIG_ERR)
_exit(1);
/* attach stdout and stdin to line */
if (dup2(line_fd, STDOUT_FILENO) == -1)
_exit(1);
if (dup2(line_fd, STDIN_FILENO) == -1)
_exit(1);
if (closefrom(STDERR_FILENO + 1) != 0)
_exit(1);
execl(_PATH_BSHELL, "sh", "-c", cmd, (void*)NULL);
_exit(1);
default:
while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
/* nothing */;
break;
}
set_termios();
}
void
pipe_command(void)
{
const char *cmd;
pid_t pid;
int fd;
cmd = get_input("Local command?");
if (cmd == NULL || *cmd == '\0')
return;
restore_termios();
switch (pid = fork()) {
case -1:
cu_err(1, "fork");
case 0:
fd = open(_PATH_DEVNULL, O_RDWR);
if (fd < 0 || dup2(fd, STDIN_FILENO) == -1)
_exit(1);
close(fd);
if (signal(SIGINT, SIG_DFL) == SIG_ERR)
_exit(1);
if (signal(SIGQUIT, SIG_DFL) == SIG_ERR)
_exit(1);
/* attach stdout to line */
if (dup2(line_fd, STDOUT_FILENO) == -1)
_exit(1);
if (closefrom(STDERR_FILENO + 1) != 0)
_exit(1);
execl(_PATH_BSHELL, "sh", "-c", cmd, (void*)NULL);
_exit(1);
default:
while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
/* nothing */;
break;
}
set_termios();
}
void
set_termios(void)
{
struct termios tio;
if (!isatty(STDIN_FILENO))
return;
memcpy(&tio, &saved_tio, sizeof(tio));
tio.c_lflag &= ~(ICANON|IEXTEN|ECHO);
tio.c_iflag &= ~(INPCK|ICRNL);
tio.c_oflag &= ~OPOST;
tio.c_cc[VMIN] = 1;
tio.c_cc[VTIME] = 0;
tio.c_cc[VDISCARD] = _POSIX_VDISABLE;
tio.c_cc[VDSUSP] = _POSIX_VDISABLE;
tio.c_cc[VINTR] = _POSIX_VDISABLE;
tio.c_cc[VLNEXT] = _POSIX_VDISABLE;
tio.c_cc[VQUIT] = _POSIX_VDISABLE;
tio.c_cc[VSUSP] = _POSIX_VDISABLE;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
cu_err(1, "tcsetattr");
}
void
xmodem_send(const char *file)
{
FILE *f;
u_char buf[3 + XMODEM_BLOCK + 2], c;
size_t len, pktlen;
uint8_t num;
uint16_t crc;
int crc_mode;
u_int i, total;
struct termios tio;
struct sigaction act, oact;
f = fopen(file, "r");
if (f == NULL) {
cu_warn("%s", file);
return;
}
memset(&act, 0, sizeof(act));
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = xmodem_signal;
if (sigaction(SIGINT, &act, &oact) != 0)
cu_err(1, "sigaction");
xmodem_stop = 0;
if (isatty(STDIN_FILENO)) {
memcpy(&tio, &saved_tio, sizeof(tio));
tio.c_lflag &= ~ECHO;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
cu_err(1, "tcsetattr");
}
tcflush(line_fd, TCIFLUSH);
if (xmodem_read(&c) != 0)
goto fail;
if (c == XMODEM_C)
crc_mode = 1;
else if (c == XMODEM_NAK)
crc_mode = 0;
else {
cu_warnx("%s: unexpected response \%03hho", file, c);
goto fail;
}
num = 1;
total = 1;
pktlen = 3 + XMODEM_BLOCK + (crc_mode ? 2 : 1);
for (;;) {
len = fread(buf + 3, 1, XMODEM_BLOCK, f);
if (len == 0)
break;
memset(buf + 3 + len, XMODEM_SUB, XMODEM_BLOCK - len);
buf[0] = XMODEM_SOH;
buf[1] = num;
buf[2] = 255 - num;
if (crc_mode) {
crc = xmodem_crc16(buf + 3, XMODEM_BLOCK);
buf[3 + XMODEM_BLOCK] = crc >> 8;
buf[3 + XMODEM_BLOCK + 1] = crc & 0xFF;
} else {
buf[3 + XMODEM_BLOCK] = 0;
for (i = 0; i < XMODEM_BLOCK; i++)
buf[3 + XMODEM_BLOCK] += buf[3 + i];
}
for (i = 0; i < XMODEM_RETRIES; i++) {
if (xmodem_stop) {
errno = EINTR;
goto fail;
}
cu_warnx("%s: sending block %u (attempt %u)", file,
total, 1 + i);
if (xmodem_write(buf, pktlen) != 0)
goto fail;
if (xmodem_read(&c) != 0)
goto fail;
if (c == XMODEM_ACK)
break;
if (c != XMODEM_NAK) {
cu_warnx("%s: unexpected response \%03hho",
file, c);
}
}
if (i == XMODEM_RETRIES) {
cu_warnx("%s: too many retries", file);
goto out;
}
if (len < XMODEM_BLOCK)
break;
num++;
total++;
}
