#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
+#include <errno.h>
+
#include <termios.h>
#include <unistd.h>
+#include <fcntl.h>
#include "putty.h"
#include "storage.h"
static void *console_logctx = NULL;
+static struct termios orig_termios_stderr;
+static int stderr_is_a_tty;
+
+void stderr_tty_init()
+{
+ /* Ensure that if stderr is a tty, we can get it back to a sane state. */
+ if ((flags & FLAG_STDERR_TTY) && isatty(STDERR_FILENO)) {
+ stderr_is_a_tty = TRUE;
+ tcgetattr(STDERR_FILENO, &orig_termios_stderr);
+ }
+}
+
+void premsg(struct termios *cf)
+{
+ if (stderr_is_a_tty) {
+ tcgetattr(STDERR_FILENO, cf);
+ tcsetattr(STDERR_FILENO, TCSADRAIN, &orig_termios_stderr);
+ }
+}
+void postmsg(struct termios *cf)
+{
+ if (stderr_is_a_tty)
+ tcsetattr(STDERR_FILENO, TCSADRAIN, cf);
+}
+
/*
* Clean up and exit.
*/
{
}
-void timer_change_notify(long next)
+void timer_change_notify(unsigned long next)
{
}
-int verify_ssh_host_key(void *frontend, char *host, int port, char *keytype,
- char *keystr, char *fingerprint,
+/*
+ * Wrapper around Unix read(2), suitable for use on a file descriptor
+ * that's been set into nonblocking mode. Handles EAGAIN/EWOULDBLOCK
+ * by means of doing a one-fd select and then trying again; all other
+ * errors (including errors from select) are returned to the caller.
+ */
+static int block_and_read(int fd, void *buf, size_t len)
+{
+ int ret;
+
+ while ((ret = read(fd, buf, len)) < 0 && (
+#ifdef EAGAIN
+ (errno == EAGAIN) ||
+#endif
+#ifdef EWOULDBLOCK
+ (errno == EWOULDBLOCK) ||
+#endif
+ 0)) {
+
+ fd_set rfds;
+ FD_ZERO(&rfds);
+ FD_SET(fd, &rfds);
+ ret = select(fd+1, &rfds, NULL, NULL, NULL);
+ assert(ret != 0);
+ if (ret < 0)
+ return ret;
+ assert(FD_ISSET(fd, &rfds));
+ }
+
+ return ret;
+}
+
+int verify_ssh_host_key(void *frontend, char *host, int port,
+ const char *keytype, char *keystr, char *fingerprint,
void (*callback)(void *ctx, int result), void *ctx)
{
int ret;
static const char abandoned[] = "Connection abandoned.\n";
char line[32];
+ struct termios cf;
/*
* Verify the key.
if (ret == 0) /* success - key matched OK */
return 1;
+ premsg(&cf);
if (ret == 2) { /* key was different */
if (console_batch_mode) {
fprintf(stderr, wrongmsg_batch, keytype, fingerprint);
newmode.c_lflag |= ECHO | ISIG | ICANON;
tcsetattr(0, TCSANOW, &newmode);
line[0] = '\0';
- read(0, line, sizeof(line) - 1);
+ if (block_and_read(0, line, sizeof(line) - 1) <= 0)
+ /* handled below */;
tcsetattr(0, TCSANOW, &oldmode);
}
if (line[0] != '\0' && line[0] != '\r' && line[0] != '\n') {
if (line[0] == 'y' || line[0] == 'Y')
store_host_key(host, port, keytype, keystr);
+ postmsg(&cf);
return 1;
} else {
fprintf(stderr, abandoned);
+ postmsg(&cf);
return 0;
}
}
static const char abandoned[] = "Connection abandoned.\n";
char line[32];
+ struct termios cf;
+ premsg(&cf);
if (console_batch_mode) {
fprintf(stderr, msg_batch, algtype, algname);
return 0;
newmode.c_lflag |= ECHO | ISIG | ICANON;
tcsetattr(0, TCSANOW, &newmode);
line[0] = '\0';
- read(0, line, sizeof(line) - 1);
+ if (block_and_read(0, line, sizeof(line) - 1) <= 0)
+ /* handled below */;
tcsetattr(0, TCSANOW, &oldmode);
}
if (line[0] == 'y' || line[0] == 'Y') {
+ postmsg(&cf);
return 1;
} else {
fprintf(stderr, abandoned);
+ postmsg(&cf);
return 0;
}
}
* Ask whether to wipe a session log file before writing to it.
* Returns 2 for wipe, 1 for append, 0 for cancel (don't log).
*/
-int askappend(void *frontend, Filename filename,
+int askappend(void *frontend, Filename *filename,
void (*callback)(void *ctx, int result), void *ctx)
{
static const char msgtemplate[] =
"Logging will not be enabled.\n";
char line[32];
+ struct termios cf;
+ premsg(&cf);
if (console_batch_mode) {
- fprintf(stderr, msgtemplate_batch, FILENAME_MAX, filename.path);
+ fprintf(stderr, msgtemplate_batch, FILENAME_MAX, filename->path);
fflush(stderr);
return 0;
}
- fprintf(stderr, msgtemplate, FILENAME_MAX, filename.path);
+ fprintf(stderr, msgtemplate, FILENAME_MAX, filename->path);
fflush(stderr);
{
newmode.c_lflag |= ECHO | ISIG | ICANON;
tcsetattr(0, TCSANOW, &newmode);
line[0] = '\0';
- read(0, line, sizeof(line) - 1);
+ if (block_and_read(0, line, sizeof(line) - 1) <= 0)
+ /* handled below */;
tcsetattr(0, TCSANOW, &oldmode);
}
+ postmsg(&cf);
if (line[0] == 'y' || line[0] == 'Y')
return 2;
else if (line[0] == 'n' || line[0] == 'N')
"Once the key is loaded into PuTTYgen, you can perform\n"
"this conversion simply by saving it again.\n";
+ struct termios cf;
+ premsg(&cf);
fputs(message, stderr);
+ postmsg(&cf);
}
void console_provide_logctx(void *logctx)
void logevent(void *frontend, const char *string)
{
+ struct termios cf;
+ if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE))
+ premsg(&cf);
if (console_logctx)
log_eventlog(console_logctx, string);
+ if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE))
+ postmsg(&cf);
+}
+
+/*
+ * Special functions to read and print to the console for password
+ * prompts and the like. Uses /dev/tty or stdin/stderr, in that order
+ * of preference; also sanitises escape sequences out of the text, on
+ * the basis that it might have been sent by a hostile SSH server
+ * doing malicious keyboard-interactive.
+ */
+static void console_open(FILE **outfp, int *infd)
+{
+ int fd;
+
+ if ((fd = open("/dev/tty", O_RDWR)) >= 0) {
+ *infd = fd;
+ *outfp = fdopen(*infd, "w");
+ } else {
+ *infd = 0;
+ *outfp = stderr;
+ }
+}
+static void console_close(FILE *outfp, int infd)
+{
+ if (outfp != stderr)
+ fclose(outfp); /* will automatically close infd too */
}
-int console_get_line(const char *prompt, char *str,
- int maxlen, int is_pw)
+static void console_prompt_text(FILE *outfp, const char *data, int len)
{
- struct termios oldmode, newmode;
int i;
- if (console_batch_mode) {
- if (maxlen > 0)
- str[0] = '\0';
+ for (i = 0; i < len; i++)
+ if ((data[i] & 0x60) || (data[i] == '\n'))
+ fputc(data[i], outfp);
+ fflush(outfp);
+}
+
+int console_get_userpass_input(prompts_t *p, const unsigned char *in,
+ int inlen)
+{
+ size_t curr_prompt;
+ FILE *outfp = NULL;
+ int infd;
+
+ /*
+ * Zero all the results, in case we abort half-way through.
+ */
+ {
+ int i;
+ for (i = 0; i < p->n_prompts; i++)
+ prompt_set_result(p->prompts[i], "");
+ }
+
+ if (p->n_prompts && console_batch_mode)
return 0;
- } else {
- tcgetattr(0, &oldmode);
+
+ console_open(&outfp, &infd);
+
+ /*
+ * Preamble.
+ */
+ /* We only print the `name' caption if we have to... */
+ if (p->name_reqd && p->name) {
+ size_t l = strlen(p->name);
+ console_prompt_text(outfp, p->name, l);
+ if (p->name[l-1] != '\n')
+ console_prompt_text(outfp, "\n", 1);
+ }
+ /* ...but we always print any `instruction'. */
+ if (p->instruction) {
+ size_t l = strlen(p->instruction);
+ console_prompt_text(outfp, p->instruction, l);
+ if (p->instruction[l-1] != '\n')
+ console_prompt_text(outfp, "\n", 1);
+ }
+
+ for (curr_prompt = 0; curr_prompt < p->n_prompts; curr_prompt++) {
+
+ struct termios oldmode, newmode;
+ int len;
+ prompt_t *pr = p->prompts[curr_prompt];
+
+ tcgetattr(infd, &oldmode);
newmode = oldmode;
newmode.c_lflag |= ISIG | ICANON;
- if (is_pw)
+ if (!pr->echo)
newmode.c_lflag &= ~ECHO;
else
newmode.c_lflag |= ECHO;
- tcsetattr(0, TCSANOW, &newmode);
-
- fputs(prompt, stdout);
- fflush(stdout);
- i = read(0, str, maxlen - 1);
-
- tcsetattr(0, TCSANOW, &oldmode);
-
- if (i > 0 && str[i-1] == '\n')
- i--;
- str[i] = '\0';
+ tcsetattr(infd, TCSANOW, &newmode);
+
+ console_prompt_text(outfp, pr->prompt, strlen(pr->prompt));
+
+ len = 0;
+ while (1) {
+ int ret;
+
+ prompt_ensure_result_size(pr, len * 5 / 4 + 512);
+ ret = read(infd, pr->result + len, pr->resultsize - len - 1);
+ if (ret <= 0) {
+ len = -1;
+ break;
+ }
+ len += ret;
+ if (pr->result[len - 1] == '\n') {
+ len--;
+ break;
+ }
+ }
+
+ tcsetattr(infd, TCSANOW, &oldmode);
+
+ if (!pr->echo)
+ console_prompt_text(outfp, "\n", 1);
+
+ if (len < 0) {
+ console_close(outfp, infd);
+ return 0; /* failure due to read error */
+ }
+
+ pr->result[len] = '\0';
+ }
- if (is_pw)
- fputs("\n", stdout);
+ console_close(outfp, infd);
- return 1;
- }
+ return 1; /* success */
}
void frontend_keypress(void *handle)
* X11-forwarding-related things suitable for console.
*/
-const char platform_x11_best_transport[] = "unix";
-
char *platform_get_x_display(void) {
return dupstr(getenv("DISPLAY"));
}