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#include <err.h>
#include <errno.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <tls.h>
#define BUFSIZE 16384
#define TLS_DEBUG 0
#if TLS_DEBUG
# define dbg(...) fprintf(stderr, __VA_ARGS__)
#else
# define dbg(...) ((void)0)
#endif
static void copy_from_stdin_to_tls(struct tls *ctx, int *fd)
{
static size_t buf[BUFSIZE];
ssize_t n;
int i = 0;
dbg("DEBUG: data from STDIN\n");
do {
n = read(STDIN_FILENO, buf, sizeof(buf));
dbg("read %zu\n", n);
} while (n < 0 && errno == EINTR);
if (n < 1) {
*fd = -1;
return;
}
while (n > 0) {
ssize_t r = tls_write(ctx, &buf[i], n);
if (r == TLS_WANT_POLLIN || r == TLS_WANT_POLLOUT)
continue;
if (r < 0)
err(1, "tls_write: %s", tls_error(ctx));
i += r;
n -= r;
}
}
static int copy_from_tls_to_stdout(struct tls *ctx)
{
static size_t buf[BUFSIZE];
ssize_t n,r;
int i = 0;
dbg("DEBUG: data from TLS\n");
do {
n = tls_read(ctx, buf, sizeof(buf));
} while (n == TLS_WANT_POLLIN || r == TLS_WANT_POLLOUT);
if (n < 0)
err(1, "tls read: %s", tls_error(ctx));
if (n == 0)
return 1;
while (n) {
r = write(STDOUT_FILENO, &buf[i], n);
if (r < 0)
err(1, "write");
i += r;
n -= r;
}
return 0;
}
int do_poll(struct pollfd *fds, int nfds)
{
int r;
while ((r = poll(fds, nfds, -1)) < 0) {
if (errno != EINTR && errno != ENOMEM)
err(1, "poll");
}
return r;
}
static void copy_loop(struct tls *ctx, int sfd)
{
struct pollfd fds[2] = {
{ .fd = STDIN_FILENO, .events = POLLIN },
{ .fd = sfd, .events = POLLIN },
};
while (1) {
int r = do_poll(fds, 2);
if (fds[0].revents)
copy_from_stdin_to_tls(ctx, &fds[0].fd);
if (fds[1].revents && copy_from_tls_to_stdout(ctx))
break;
}
}
void usage(const char *prog, int ret) {
printf("usage: %s [-s FD] [-I] -n SNI\n", prog);
exit(ret);
}
int main(int argc, char *argv[])
{
int c, sfd = 1;;
const char *sni = NULL;
struct tls_config *tc;
struct tls *ctx;
int insecure = 0;
while ((c = getopt(argc, argv, "hs:n:I")) != -1) {
switch (c) {
case 'h':
usage(argv[0], 0);
break;
case 's':
sfd = atoi(optarg);
break;
case 'n':
sni = optarg;
break;
case 'I':
insecure = 1;
break;
case '?':
usage(argv[0], 1);
}
}
if (tls_init() == -1)
errx(1, "tls_init() failed");
if ((ctx = tls_client()) == NULL)
errx(1, "tls_client() failed");
if (insecure) {
if ((tc = tls_config_new()) == NULL)
errx(1, "tls_config_new() failed");
tls_config_insecure_noverifycert(tc);
tls_config_insecure_noverifyname(tc);
tls_config_insecure_noverifytime(tc);
if (tls_configure(ctx, tc) == -1)
err(1, "tls_configure: %s", tls_error(ctx));
tls_config_free(tc);
}
if (tls_connect_fds(ctx, sfd, sfd, sni) == -1)
errx(1, "%s: TLS connect failed", sni);
if (tls_handshake(ctx) == -1)
errx(1, "%s: %s", sni, tls_error(ctx));
copy_loop(ctx, sfd);
tls_close(ctx);
return 0;
}
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