mirror of
https://github.com/git/git
synced 2024-08-28 12:09:19 +00:00
![René Scharfe](/assets/img/avatar_default.png)
hex2chr() takes care not to run over the end of a NUL-terminated string. It's used in packet_length(), but both callers of that function pass a four-byte buffer, making NUL-checks unnecessary. packet_length() could accidentally be used with a pointer to a buffer of unknown size at new call-sites, though, and the compiler wouldn't complain. Add a size parameter plus check, and remove the NUL-checks by calling hexval() directly. This trades three NUL checks against one size check and the ability to report the use of a short buffer at runtime. If any of the four bytes is NUL or -- more generally -- not a hexadecimal digit, then packet_length() still returns a negative value. Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
685 lines
16 KiB
C
685 lines
16 KiB
C
#include "git-compat-util.h"
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#include "copy.h"
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#include "pkt-line.h"
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#include "gettext.h"
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#include "hex.h"
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#include "run-command.h"
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#include "trace.h"
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#include "wrapper.h"
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#include "write-or-die.h"
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char packet_buffer[LARGE_PACKET_MAX];
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static const char *packet_trace_prefix = "git";
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static struct trace_key trace_packet = TRACE_KEY_INIT(PACKET);
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static struct trace_key trace_pack = TRACE_KEY_INIT(PACKFILE);
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void packet_trace_identity(const char *prog)
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{
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packet_trace_prefix = xstrdup(prog);
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}
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static const char *get_trace_prefix(void)
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{
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return in_async() ? "sideband" : packet_trace_prefix;
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}
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static int packet_trace_pack(const char *buf, unsigned int len, int sideband)
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{
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if (!sideband) {
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trace_verbatim(&trace_pack, buf, len);
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return 1;
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} else if (len && *buf == '\1') {
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trace_verbatim(&trace_pack, buf + 1, len - 1);
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return 1;
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} else {
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/* it's another non-pack sideband */
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return 0;
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}
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}
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static void packet_trace(const char *buf, unsigned int len, int write)
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{
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int i;
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struct strbuf out;
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static int in_pack, sideband;
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if (!trace_want(&trace_packet) && !trace_want(&trace_pack))
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return;
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if (in_pack) {
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if (packet_trace_pack(buf, len, sideband))
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return;
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} else if (starts_with(buf, "PACK") || starts_with(buf, "\1PACK")) {
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in_pack = 1;
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sideband = *buf == '\1';
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packet_trace_pack(buf, len, sideband);
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/*
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* Make a note in the human-readable trace that the pack data
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* started.
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*/
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buf = "PACK ...";
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len = strlen(buf);
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}
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if (!trace_want(&trace_packet))
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return;
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/* +32 is just a guess for header + quoting */
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strbuf_init(&out, len+32);
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strbuf_addf(&out, "packet: %12s%c ",
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get_trace_prefix(), write ? '>' : '<');
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/* XXX we should really handle printable utf8 */
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for (i = 0; i < len; i++) {
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/* suppress newlines */
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if (buf[i] == '\n')
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continue;
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if (buf[i] >= 0x20 && buf[i] <= 0x7e)
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strbuf_addch(&out, buf[i]);
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else
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strbuf_addf(&out, "\\%o", buf[i]);
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}
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strbuf_addch(&out, '\n');
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trace_strbuf(&trace_packet, &out);
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strbuf_release(&out);
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}
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/*
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* If we buffered things up above (we don't, but we should),
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* we'd flush it here
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*/
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void packet_flush(int fd)
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{
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packet_trace("0000", 4, 1);
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if (write_in_full(fd, "0000", 4) < 0)
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die_errno(_("unable to write flush packet"));
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}
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void packet_delim(int fd)
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{
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packet_trace("0001", 4, 1);
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if (write_in_full(fd, "0001", 4) < 0)
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die_errno(_("unable to write delim packet"));
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}
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void packet_response_end(int fd)
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{
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packet_trace("0002", 4, 1);
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if (write_in_full(fd, "0002", 4) < 0)
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die_errno(_("unable to write response end packet"));
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}
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int packet_flush_gently(int fd)
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{
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packet_trace("0000", 4, 1);
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if (write_in_full(fd, "0000", 4) < 0)
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return error(_("flush packet write failed"));
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return 0;
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}
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void packet_buf_flush(struct strbuf *buf)
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{
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packet_trace("0000", 4, 1);
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strbuf_add(buf, "0000", 4);
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}
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void packet_buf_delim(struct strbuf *buf)
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{
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packet_trace("0001", 4, 1);
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strbuf_add(buf, "0001", 4);
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}
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void set_packet_header(char *buf, int size)
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{
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static char hexchar[] = "0123456789abcdef";
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#define hex(a) (hexchar[(a) & 15])
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buf[0] = hex(size >> 12);
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buf[1] = hex(size >> 8);
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buf[2] = hex(size >> 4);
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buf[3] = hex(size);
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#undef hex
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}
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static void format_packet(struct strbuf *out, const char *prefix,
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const char *fmt, va_list args)
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{
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size_t orig_len, n;
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orig_len = out->len;
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strbuf_addstr(out, "0000");
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strbuf_addstr(out, prefix);
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strbuf_vaddf(out, fmt, args);
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n = out->len - orig_len;
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if (n > LARGE_PACKET_MAX)
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die(_("protocol error: impossibly long line"));
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set_packet_header(&out->buf[orig_len], n);
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packet_trace(out->buf + orig_len + 4, n - 4, 1);
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}
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static int packet_write_fmt_1(int fd, int gently, const char *prefix,
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const char *fmt, va_list args)
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{
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static struct strbuf buf = STRBUF_INIT;
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strbuf_reset(&buf);
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format_packet(&buf, prefix, fmt, args);
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if (write_in_full(fd, buf.buf, buf.len) < 0) {
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if (!gently) {
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check_pipe(errno);
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die_errno(_("packet write with format failed"));
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}
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return error(_("packet write with format failed"));
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}
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return 0;
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}
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void packet_write_fmt(int fd, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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packet_write_fmt_1(fd, 0, "", fmt, args);
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va_end(args);
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}
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int packet_write_fmt_gently(int fd, const char *fmt, ...)
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{
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int status;
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va_list args;
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va_start(args, fmt);
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status = packet_write_fmt_1(fd, 1, "", fmt, args);
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va_end(args);
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return status;
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}
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static int do_packet_write(const int fd_out, const char *buf, size_t size,
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struct strbuf *err)
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{
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char header[4];
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size_t packet_size;
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if (size > LARGE_PACKET_DATA_MAX) {
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strbuf_addstr(err, _("packet write failed - data exceeds max packet size"));
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return -1;
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}
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packet_trace(buf, size, 1);
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packet_size = size + 4;
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set_packet_header(header, packet_size);
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/*
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* Write the header and the buffer in 2 parts so that we do
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* not need to allocate a buffer or rely on a static buffer.
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* This also avoids putting a large buffer on the stack which
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* might have multi-threading issues.
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*/
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if (write_in_full(fd_out, header, 4) < 0 ||
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write_in_full(fd_out, buf, size) < 0) {
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strbuf_addf(err, _("packet write failed: %s"), strerror(errno));
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return -1;
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}
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return 0;
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}
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static int packet_write_gently(const int fd_out, const char *buf, size_t size)
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{
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struct strbuf err = STRBUF_INIT;
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if (do_packet_write(fd_out, buf, size, &err)) {
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error("%s", err.buf);
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strbuf_release(&err);
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return -1;
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}
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return 0;
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}
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void packet_write(int fd_out, const char *buf, size_t size)
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{
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struct strbuf err = STRBUF_INIT;
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if (do_packet_write(fd_out, buf, size, &err))
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die("%s", err.buf);
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}
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void packet_fwrite(FILE *f, const char *buf, size_t size)
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{
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size_t packet_size;
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char header[4];
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if (size > LARGE_PACKET_DATA_MAX)
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die(_("packet write failed - data exceeds max packet size"));
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packet_trace(buf, size, 1);
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packet_size = size + 4;
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set_packet_header(header, packet_size);
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fwrite_or_die(f, header, 4);
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fwrite_or_die(f, buf, size);
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}
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void packet_fwrite_fmt(FILE *fh, const char *fmt, ...)
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{
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static struct strbuf buf = STRBUF_INIT;
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va_list args;
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strbuf_reset(&buf);
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va_start(args, fmt);
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format_packet(&buf, "", fmt, args);
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va_end(args);
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fwrite_or_die(fh, buf.buf, buf.len);
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}
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void packet_fflush(FILE *f)
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{
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packet_trace("0000", 4, 1);
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fwrite_or_die(f, "0000", 4);
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fflush_or_die(f);
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}
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void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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format_packet(buf, "", fmt, args);
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va_end(args);
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}
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int write_packetized_from_fd_no_flush(int fd_in, int fd_out)
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{
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char *buf = xmalloc(LARGE_PACKET_DATA_MAX);
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int err = 0;
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ssize_t bytes_to_write;
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while (!err) {
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bytes_to_write = xread(fd_in, buf, LARGE_PACKET_DATA_MAX);
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if (bytes_to_write < 0) {
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free(buf);
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return COPY_READ_ERROR;
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}
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if (bytes_to_write == 0)
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break;
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err = packet_write_gently(fd_out, buf, bytes_to_write);
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}
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free(buf);
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return err;
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}
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int write_packetized_from_buf_no_flush_count(const char *src_in, size_t len,
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int fd_out, int *packet_counter)
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{
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int err = 0;
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size_t bytes_written = 0;
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size_t bytes_to_write;
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while (!err) {
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if ((len - bytes_written) > LARGE_PACKET_DATA_MAX)
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bytes_to_write = LARGE_PACKET_DATA_MAX;
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else
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bytes_to_write = len - bytes_written;
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if (bytes_to_write == 0)
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break;
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err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write);
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bytes_written += bytes_to_write;
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if (packet_counter)
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(*packet_counter)++;
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}
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return err;
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}
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static int get_packet_data(int fd, char **src_buf, size_t *src_size,
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void *dst, unsigned size, int options)
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{
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ssize_t ret;
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if (fd >= 0 && src_buf && *src_buf)
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BUG("multiple sources given to packet_read");
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/* Read up to "size" bytes from our source, whatever it is. */
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if (src_buf && *src_buf) {
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ret = size < *src_size ? size : *src_size;
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memcpy(dst, *src_buf, ret);
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*src_buf += ret;
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*src_size -= ret;
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} else {
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ret = read_in_full(fd, dst, size);
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if (ret < 0) {
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if (options & PACKET_READ_GENTLE_ON_READ_ERROR)
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return error_errno(_("read error"));
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die_errno(_("read error"));
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}
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}
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/* And complain if we didn't get enough bytes to satisfy the read. */
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if (ret != size) {
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if (options & PACKET_READ_GENTLE_ON_EOF)
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return -1;
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if (options & PACKET_READ_GENTLE_ON_READ_ERROR)
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return error(_("the remote end hung up unexpectedly"));
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die(_("the remote end hung up unexpectedly"));
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}
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return ret;
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}
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int packet_length(const char lenbuf_hex[4], size_t size)
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{
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if (size < 4)
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BUG("buffer too small");
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return hexval(lenbuf_hex[0]) << 12 |
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hexval(lenbuf_hex[1]) << 8 |
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hexval(lenbuf_hex[2]) << 4 |
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hexval(lenbuf_hex[3]);
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}
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static char *find_packfile_uri_path(const char *buffer)
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{
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const char *URI_MARK = "://";
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char *path;
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int len;
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/* First char is sideband mark */
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buffer += 1;
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len = strspn(buffer, "0123456789abcdefABCDEF");
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/* size of SHA1 and SHA256 hash */
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if (!(len == 40 || len == 64) || buffer[len] != ' ')
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return NULL; /* required "<hash>SP" not seen */
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path = strstr(buffer + len + 1, URI_MARK);
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if (!path)
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return NULL;
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path = strchr(path + strlen(URI_MARK), '/');
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if (!path || !*(path + 1))
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return NULL;
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/* position after '/' */
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return ++path;
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}
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enum packet_read_status packet_read_with_status(int fd, char **src_buffer,
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size_t *src_len, char *buffer,
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unsigned size, int *pktlen,
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int options)
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{
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int len;
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char linelen[4];
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char *uri_path_start;
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if (get_packet_data(fd, src_buffer, src_len, linelen, 4, options) < 0) {
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*pktlen = -1;
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return PACKET_READ_EOF;
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}
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len = packet_length(linelen, sizeof(linelen));
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if (len < 0) {
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if (options & PACKET_READ_GENTLE_ON_READ_ERROR)
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return error(_("protocol error: bad line length "
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"character: %.4s"), linelen);
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die(_("protocol error: bad line length character: %.4s"), linelen);
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} else if (!len) {
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packet_trace("0000", 4, 0);
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*pktlen = 0;
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return PACKET_READ_FLUSH;
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} else if (len == 1) {
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packet_trace("0001", 4, 0);
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*pktlen = 0;
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return PACKET_READ_DELIM;
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} else if (len == 2) {
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packet_trace("0002", 4, 0);
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*pktlen = 0;
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return PACKET_READ_RESPONSE_END;
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} else if (len < 4) {
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if (options & PACKET_READ_GENTLE_ON_READ_ERROR)
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return error(_("protocol error: bad line length %d"),
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len);
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die(_("protocol error: bad line length %d"), len);
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}
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len -= 4;
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if ((unsigned)len >= size) {
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if (options & PACKET_READ_GENTLE_ON_READ_ERROR)
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return error(_("protocol error: bad line length %d"),
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len);
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die(_("protocol error: bad line length %d"), len);
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}
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if (get_packet_data(fd, src_buffer, src_len, buffer, len, options) < 0) {
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*pktlen = -1;
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return PACKET_READ_EOF;
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}
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if ((options & PACKET_READ_CHOMP_NEWLINE) &&
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len && buffer[len-1] == '\n')
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len--;
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buffer[len] = 0;
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if (options & PACKET_READ_REDACT_URI_PATH &&
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(uri_path_start = find_packfile_uri_path(buffer))) {
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const char *redacted = "<redacted>";
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struct strbuf tracebuf = STRBUF_INIT;
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strbuf_insert(&tracebuf, 0, buffer, len);
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strbuf_splice(&tracebuf, uri_path_start - buffer,
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strlen(uri_path_start), redacted, strlen(redacted));
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packet_trace(tracebuf.buf, tracebuf.len, 0);
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strbuf_release(&tracebuf);
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} else {
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packet_trace(buffer, len, 0);
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}
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if ((options & PACKET_READ_DIE_ON_ERR_PACKET) &&
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starts_with(buffer, "ERR "))
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die(_("remote error: %s"), buffer + 4);
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*pktlen = len;
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return PACKET_READ_NORMAL;
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}
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int packet_read(int fd, char *buffer, unsigned size, int options)
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{
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int pktlen = -1;
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packet_read_with_status(fd, NULL, NULL, buffer, size, &pktlen,
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options);
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return pktlen;
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}
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char *packet_read_line(int fd, int *dst_len)
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{
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int len = packet_read(fd, packet_buffer, sizeof(packet_buffer),
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PACKET_READ_CHOMP_NEWLINE);
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if (dst_len)
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*dst_len = len;
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return (len > 0) ? packet_buffer : NULL;
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}
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int packet_read_line_gently(int fd, int *dst_len, char **dst_line)
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{
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int len = packet_read(fd, packet_buffer, sizeof(packet_buffer),
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PACKET_READ_CHOMP_NEWLINE|PACKET_READ_GENTLE_ON_EOF);
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if (dst_len)
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*dst_len = len;
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if (dst_line)
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*dst_line = (len > 0) ? packet_buffer : NULL;
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|
return len;
|
|
}
|
|
|
|
ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out, int options)
|
|
{
|
|
int packet_len;
|
|
|
|
size_t orig_len = sb_out->len;
|
|
size_t orig_alloc = sb_out->alloc;
|
|
|
|
for (;;) {
|
|
strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX);
|
|
packet_len = packet_read(fd_in,
|
|
/* strbuf_grow() above always allocates one extra byte to
|
|
* store a '\0' at the end of the string. packet_read()
|
|
* writes a '\0' extra byte at the end, too. Let it know
|
|
* that there is already room for the extra byte.
|
|
*/
|
|
sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1,
|
|
options);
|
|
if (packet_len <= 0)
|
|
break;
|
|
sb_out->len += packet_len;
|
|
}
|
|
|
|
if (packet_len < 0) {
|
|
if (orig_alloc == 0)
|
|
strbuf_release(sb_out);
|
|
else
|
|
strbuf_setlen(sb_out, orig_len);
|
|
return packet_len;
|
|
}
|
|
return sb_out->len - orig_len;
|
|
}
|
|
|
|
int recv_sideband(const char *me, int in_stream, int out)
|
|
{
|
|
char buf[LARGE_PACKET_MAX + 1];
|
|
int len;
|
|
struct strbuf scratch = STRBUF_INIT;
|
|
enum sideband_type sideband_type;
|
|
|
|
while (1) {
|
|
int status = packet_read_with_status(in_stream, NULL, NULL,
|
|
buf, LARGE_PACKET_MAX,
|
|
&len,
|
|
PACKET_READ_GENTLE_ON_EOF);
|
|
if (!demultiplex_sideband(me, status, buf, len, 0, &scratch,
|
|
&sideband_type))
|
|
continue;
|
|
switch (sideband_type) {
|
|
case SIDEBAND_PRIMARY:
|
|
write_or_die(out, buf + 1, len - 1);
|
|
break;
|
|
default: /* errors: message already written */
|
|
if (scratch.len > 0)
|
|
BUG("unhandled incomplete sideband: '%s'",
|
|
scratch.buf);
|
|
return sideband_type;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Packet Reader Functions */
|
|
void packet_reader_init(struct packet_reader *reader, int fd,
|
|
char *src_buffer, size_t src_len,
|
|
int options)
|
|
{
|
|
memset(reader, 0, sizeof(*reader));
|
|
|
|
reader->fd = fd;
|
|
reader->src_buffer = src_buffer;
|
|
reader->src_len = src_len;
|
|
reader->buffer = packet_buffer;
|
|
reader->buffer_size = sizeof(packet_buffer);
|
|
reader->options = options;
|
|
reader->me = "git";
|
|
reader->hash_algo = &hash_algos[GIT_HASH_SHA1];
|
|
}
|
|
|
|
enum packet_read_status packet_reader_read(struct packet_reader *reader)
|
|
{
|
|
struct strbuf scratch = STRBUF_INIT;
|
|
|
|
if (reader->line_peeked) {
|
|
reader->line_peeked = 0;
|
|
return reader->status;
|
|
}
|
|
|
|
/*
|
|
* Consume all progress packets until a primary payload packet is
|
|
* received
|
|
*/
|
|
while (1) {
|
|
enum sideband_type sideband_type;
|
|
reader->status = packet_read_with_status(reader->fd,
|
|
&reader->src_buffer,
|
|
&reader->src_len,
|
|
reader->buffer,
|
|
reader->buffer_size,
|
|
&reader->pktlen,
|
|
reader->options);
|
|
if (!reader->use_sideband)
|
|
break;
|
|
if (demultiplex_sideband(reader->me, reader->status,
|
|
reader->buffer, reader->pktlen, 1,
|
|
&scratch, &sideband_type))
|
|
break;
|
|
}
|
|
|
|
if (reader->status == PACKET_READ_NORMAL)
|
|
/* Skip the sideband designator if sideband is used */
|
|
reader->line = reader->use_sideband ?
|
|
reader->buffer + 1 : reader->buffer;
|
|
else
|
|
reader->line = NULL;
|
|
|
|
return reader->status;
|
|
}
|
|
|
|
enum packet_read_status packet_reader_peek(struct packet_reader *reader)
|
|
{
|
|
/* Only allow peeking a single line */
|
|
if (reader->line_peeked)
|
|
return reader->status;
|
|
|
|
/* Peek a line by reading it and setting peeked flag */
|
|
packet_reader_read(reader);
|
|
reader->line_peeked = 1;
|
|
return reader->status;
|
|
}
|
|
|
|
void packet_writer_init(struct packet_writer *writer, int dest_fd)
|
|
{
|
|
writer->dest_fd = dest_fd;
|
|
writer->use_sideband = 0;
|
|
}
|
|
|
|
void packet_writer_write(struct packet_writer *writer, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
packet_write_fmt_1(writer->dest_fd, 0,
|
|
writer->use_sideband ? "\001" : "", fmt, args);
|
|
va_end(args);
|
|
}
|
|
|
|
void packet_writer_error(struct packet_writer *writer, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
packet_write_fmt_1(writer->dest_fd, 0,
|
|
writer->use_sideband ? "\003" : "ERR ", fmt, args);
|
|
va_end(args);
|
|
}
|
|
|
|
void packet_writer_delim(struct packet_writer *writer)
|
|
{
|
|
packet_delim(writer->dest_fd);
|
|
}
|
|
|
|
void packet_writer_flush(struct packet_writer *writer)
|
|
{
|
|
packet_flush(writer->dest_fd);
|
|
}
|