| #include "cache.h" |
| #include "pkt-line.h" |
| |
| char packet_buffer[LARGE_PACKET_MAX]; |
| static const char *packet_trace_prefix = "git"; |
| static struct trace_key trace_packet = TRACE_KEY_INIT(PACKET); |
| |
| void packet_trace_identity(const char *prog) |
| { |
| packet_trace_prefix = xstrdup(prog); |
| } |
| |
| static void packet_trace(const char *buf, unsigned int len, int write) |
| { |
| int i; |
| struct strbuf out; |
| |
| if (!trace_want(&trace_packet)) |
| return; |
| |
| /* +32 is just a guess for header + quoting */ |
| strbuf_init(&out, len+32); |
| |
| strbuf_addf(&out, "packet: %12s%c ", |
| packet_trace_prefix, write ? '>' : '<'); |
| |
| if ((len >= 4 && starts_with(buf, "PACK")) || |
| (len >= 5 && starts_with(buf+1, "PACK"))) { |
| strbuf_addstr(&out, "PACK ..."); |
| trace_disable(&trace_packet); |
| } |
| else { |
| /* XXX we should really handle printable utf8 */ |
| for (i = 0; i < len; i++) { |
| /* suppress newlines */ |
| if (buf[i] == '\n') |
| continue; |
| if (buf[i] >= 0x20 && buf[i] <= 0x7e) |
| strbuf_addch(&out, buf[i]); |
| else |
| strbuf_addf(&out, "\\%o", buf[i]); |
| } |
| } |
| |
| strbuf_addch(&out, '\n'); |
| trace_strbuf(&trace_packet, &out); |
| strbuf_release(&out); |
| } |
| |
| /* |
| * If we buffered things up above (we don't, but we should), |
| * we'd flush it here |
| */ |
| void packet_flush(int fd) |
| { |
| packet_trace("0000", 4, 1); |
| write_or_die(fd, "0000", 4); |
| } |
| |
| void packet_buf_flush(struct strbuf *buf) |
| { |
| packet_trace("0000", 4, 1); |
| strbuf_add(buf, "0000", 4); |
| } |
| |
| #define hex(a) (hexchar[(a) & 15]) |
| static void format_packet(struct strbuf *out, const char *fmt, va_list args) |
| { |
| static char hexchar[] = "0123456789abcdef"; |
| size_t orig_len, n; |
| |
| orig_len = out->len; |
| strbuf_addstr(out, "0000"); |
| strbuf_vaddf(out, fmt, args); |
| n = out->len - orig_len; |
| |
| if (n > LARGE_PACKET_MAX) |
| die("protocol error: impossibly long line"); |
| |
| out->buf[orig_len + 0] = hex(n >> 12); |
| out->buf[orig_len + 1] = hex(n >> 8); |
| out->buf[orig_len + 2] = hex(n >> 4); |
| out->buf[orig_len + 3] = hex(n); |
| packet_trace(out->buf + orig_len + 4, n - 4, 1); |
| } |
| |
| void packet_write(int fd, const char *fmt, ...) |
| { |
| static struct strbuf buf = STRBUF_INIT; |
| va_list args; |
| |
| strbuf_reset(&buf); |
| va_start(args, fmt); |
| format_packet(&buf, fmt, args); |
| va_end(args); |
| write_or_die(fd, buf.buf, buf.len); |
| } |
| |
| void packet_buf_write(struct strbuf *buf, const char *fmt, ...) |
| { |
| va_list args; |
| |
| va_start(args, fmt); |
| format_packet(buf, fmt, args); |
| va_end(args); |
| } |
| |
| static int get_packet_data(int fd, char **src_buf, size_t *src_size, |
| void *dst, unsigned size, int options) |
| { |
| ssize_t ret; |
| |
| if (fd >= 0 && src_buf && *src_buf) |
| die("BUG: multiple sources given to packet_read"); |
| |
| /* Read up to "size" bytes from our source, whatever it is. */ |
| if (src_buf && *src_buf) { |
| ret = size < *src_size ? size : *src_size; |
| memcpy(dst, *src_buf, ret); |
| *src_buf += ret; |
| *src_size -= ret; |
| } else { |
| ret = read_in_full(fd, dst, size); |
| if (ret < 0) |
| die_errno("read error"); |
| } |
| |
| /* And complain if we didn't get enough bytes to satisfy the read. */ |
| if (ret < size) { |
| if (options & PACKET_READ_GENTLE_ON_EOF) |
| return -1; |
| |
| die("The remote end hung up unexpectedly"); |
| } |
| |
| return ret; |
| } |
| |
| static int packet_length(const char *linelen) |
| { |
| int n; |
| int len = 0; |
| |
| for (n = 0; n < 4; n++) { |
| unsigned char c = linelen[n]; |
| len <<= 4; |
| if (c >= '0' && c <= '9') { |
| len += c - '0'; |
| continue; |
| } |
| if (c >= 'a' && c <= 'f') { |
| len += c - 'a' + 10; |
| continue; |
| } |
| if (c >= 'A' && c <= 'F') { |
| len += c - 'A' + 10; |
| continue; |
| } |
| return -1; |
| } |
| return len; |
| } |
| |
| int packet_read(int fd, char **src_buf, size_t *src_len, |
| char *buffer, unsigned size, int options) |
| { |
| int len, ret; |
| char linelen[4]; |
| |
| ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options); |
| if (ret < 0) |
| return ret; |
| len = packet_length(linelen); |
| if (len < 0) |
| die("protocol error: bad line length character: %.4s", linelen); |
| if (!len) { |
| packet_trace("0000", 4, 0); |
| return 0; |
| } |
| len -= 4; |
| if (len >= size) |
| die("protocol error: bad line length %d", len); |
| ret = get_packet_data(fd, src_buf, src_len, buffer, len, options); |
| if (ret < 0) |
| return ret; |
| |
| if ((options & PACKET_READ_CHOMP_NEWLINE) && |
| len && buffer[len-1] == '\n') |
| len--; |
| |
| buffer[len] = 0; |
| packet_trace(buffer, len, 0); |
| return len; |
| } |
| |
| static char *packet_read_line_generic(int fd, |
| char **src, size_t *src_len, |
| int *dst_len) |
| { |
| int len = packet_read(fd, src, src_len, |
| packet_buffer, sizeof(packet_buffer), |
| PACKET_READ_CHOMP_NEWLINE); |
| if (dst_len) |
| *dst_len = len; |
| return len ? packet_buffer : NULL; |
| } |
| |
| char *packet_read_line(int fd, int *len_p) |
| { |
| return packet_read_line_generic(fd, NULL, NULL, len_p); |
| } |
| |
| char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len) |
| { |
| return packet_read_line_generic(-1, src, src_len, dst_len); |
| } |