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/*
* Copyright (c) 2019 Ori Bernstein <ori@openbsd.org>
* Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "got_error.h"
#include "got_lib_pkt.h"
#include "got_lib_poll.h"
const struct got_error *
got_pkt_readn(ssize_t *off, int fd, void *buf, size_t n,
int timeout)
{
const struct got_error *err;
size_t len;
err = got_poll_read_full_timeout(fd, &len, buf, n, n,
timeout);
if (err)
return err;
/* XXX size_t -> ssize_t */
if (len > SSIZE_MAX)
return got_error(GOT_ERR_RANGE);
*off = len;
return NULL;
}
const struct got_error *
got_pkt_flushpkt(int fd, int chattygot)
{
ssize_t w;
if (chattygot > 1)
fprintf(stderr, "%s: writepkt: 0000\n", getprogname());
w = write(fd, "0000", 4);
if (w == -1)
return got_error_from_errno("write");
if (w != 4)
return got_error(GOT_ERR_IO);
return NULL;
}
const struct got_error *
got_pkt_readlen(int *len, const char *str, int chattygot)
{
int i;
*len = 0;
for (i = 0; i < 4; i++) {
if ('0' <= str[i] && str[i] <= '9') {
*len *= 16;
*len += str[i] - '0';
} else if ('a' <= str[i] && str[i] <= 'f') {
*len *= 16;
*len += str[i] - 'a' + 10;
} else {
if (chattygot)
fprintf(stderr, "%s: bad length: '.4%s'\n",
getprogname(), str);
return got_error_msg(GOT_ERR_BAD_PACKET,
"packet length has invalid format");
}
}
return NULL;
}
/*
* Packet header contains a 4-byte hexstring which specifies the length
* of data which follows.
*/
const struct got_error *
got_pkt_readhdr(int *datalen, int fd, int chattygot, int timeout)
{
static const struct got_error *err;
char lenstr[4];
ssize_t r;
int n;
*datalen = 0;
err = got_pkt_readn(&r, fd, lenstr, 4, timeout);
if (err)
return err;
if (r == 0) {
/* implicit "0000" */
if (chattygot > 1)
fprintf(stderr, "%s: readpkt: 0000\n", getprogname());
return NULL;
}
if (r != 4)
return got_error_msg(GOT_ERR_BAD_PACKET,
"wrong packet header length");
err = got_pkt_readlen(&n, lenstr, chattygot);
if (n == 0)
return err;
if (n <= 4)
return got_error_msg(GOT_ERR_BAD_PACKET, "packet too short");
n -= 4;
*datalen = n;
return NULL;
}
const struct got_error *
got_pkt_readpkt(int *outlen, int fd, char *buf, int buflen, int chattygot,
int timeout)
{
const struct got_error *err = NULL;
int datalen, i;
ssize_t n;
err = got_pkt_readhdr(&datalen, fd, chattygot, timeout);
if (err)
return err;
if (datalen > buflen)
return got_error(GOT_ERR_NO_SPACE);
err = got_pkt_readn(&n, fd, buf, datalen, timeout);
if (err)
return err;
if (n != datalen)
return got_error_msg(GOT_ERR_BAD_PACKET, "short packet");
if (chattygot > 1) {
fprintf(stderr, "%s: readpkt: %zd:\t", getprogname(), n);
for (i = 0; i < n; i++) {
if (isprint((unsigned char)buf[i]))
fputc(buf[i], stderr);
else
fprintf(stderr, "[0x%.2x]", buf[i]);
}
fputc('\n', stderr);
}
*outlen = n;
return NULL;
}
const struct got_error *
got_pkt_writepkt(int fd, char *buf, int nbuf, int chattygot)
{
char len[5];
int i, ret;
ssize_t w;
ret = snprintf(len, sizeof(len), "%04x", nbuf + 4);
if (ret < 0 || (size_t)ret >= sizeof(len))
return got_error(GOT_ERR_NO_SPACE);
w = write(fd, len, 4);
if (w == -1)
return got_error_from_errno("write");
if (w != 4)
return got_error(GOT_ERR_IO);
w = write(fd, buf, nbuf);
if (w == -1)
return got_error_from_errno("write");
if (w != nbuf)
return got_error(GOT_ERR_IO);
if (chattygot > 1) {
fprintf(stderr, "%s: writepkt: %s:\t", getprogname(), len);
for (i = 0; i < nbuf; i++) {
if (isprint((unsigned char)buf[i]))
fputc(buf[i], stderr);
else
fprintf(stderr, "[0x%.2x]", buf[i]);
}
fputc('\n', stderr);
}
return NULL;
}
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