]>
Commit | Line | Data |
---|---|---|
f3a3214e LT |
1 | #include "cache.h" |
2 | #include "pkt-line.h" | |
3 | ||
74543a04 | 4 | char packet_buffer[LARGE_PACKET_MAX]; |
1e4cd68c | 5 | static const char *packet_trace_prefix = "git"; |
6aa30857 | 6 | static struct trace_key trace_packet = TRACE_KEY_INIT(PACKET); |
32359838 | 7 | static struct trace_key trace_pack = TRACE_KEY_INIT(PACKFILE); |
bbc30f99 JK |
8 | |
9 | void packet_trace_identity(const char *prog) | |
10 | { | |
11 | packet_trace_prefix = xstrdup(prog); | |
12 | } | |
13 | ||
32359838 JK |
14 | static int packet_trace_pack(const char *buf, unsigned int len, int sideband) |
15 | { | |
16 | if (!sideband) { | |
17 | trace_verbatim(&trace_pack, buf, len); | |
18 | return 1; | |
19 | } else if (len && *buf == '\1') { | |
20 | trace_verbatim(&trace_pack, buf + 1, len - 1); | |
21 | return 1; | |
22 | } else { | |
23 | /* it's another non-pack sideband */ | |
24 | return 0; | |
25 | } | |
26 | } | |
27 | ||
bbc30f99 JK |
28 | static void packet_trace(const char *buf, unsigned int len, int write) |
29 | { | |
30 | int i; | |
31 | struct strbuf out; | |
32359838 JK |
32 | static int in_pack, sideband; |
33 | ||
34 | if (!trace_want(&trace_packet) && !trace_want(&trace_pack)) | |
35 | return; | |
36 | ||
37 | if (in_pack) { | |
38 | if (packet_trace_pack(buf, len, sideband)) | |
39 | return; | |
40 | } else if (starts_with(buf, "PACK") || starts_with(buf, "\1PACK")) { | |
41 | in_pack = 1; | |
42 | sideband = *buf == '\1'; | |
43 | packet_trace_pack(buf, len, sideband); | |
44 | ||
45 | /* | |
46 | * Make a note in the human-readable trace that the pack data | |
47 | * started. | |
48 | */ | |
49 | buf = "PACK ..."; | |
50 | len = strlen(buf); | |
51 | } | |
bbc30f99 | 52 | |
6aa30857 | 53 | if (!trace_want(&trace_packet)) |
bbc30f99 JK |
54 | return; |
55 | ||
56 | /* +32 is just a guess for header + quoting */ | |
57 | strbuf_init(&out, len+32); | |
58 | ||
59 | strbuf_addf(&out, "packet: %12s%c ", | |
60 | packet_trace_prefix, write ? '>' : '<'); | |
61 | ||
32359838 JK |
62 | /* XXX we should really handle printable utf8 */ |
63 | for (i = 0; i < len; i++) { | |
64 | /* suppress newlines */ | |
65 | if (buf[i] == '\n') | |
66 | continue; | |
67 | if (buf[i] >= 0x20 && buf[i] <= 0x7e) | |
68 | strbuf_addch(&out, buf[i]); | |
69 | else | |
70 | strbuf_addf(&out, "\\%o", buf[i]); | |
bbc30f99 JK |
71 | } |
72 | ||
73 | strbuf_addch(&out, '\n'); | |
6aa30857 | 74 | trace_strbuf(&trace_packet, &out); |
bbc30f99 JK |
75 | strbuf_release(&out); |
76 | } | |
77 | ||
f3a3214e LT |
78 | /* |
79 | * If we buffered things up above (we don't, but we should), | |
80 | * we'd flush it here | |
81 | */ | |
82 | void packet_flush(int fd) | |
83 | { | |
bbc30f99 | 84 | packet_trace("0000", 4, 1); |
cdf4fb8e | 85 | write_or_die(fd, "0000", 4); |
f3a3214e LT |
86 | } |
87 | ||
f5615d24 SP |
88 | void packet_buf_flush(struct strbuf *buf) |
89 | { | |
bbc30f99 | 90 | packet_trace("0000", 4, 1); |
f5615d24 SP |
91 | strbuf_add(buf, "0000", 4); |
92 | } | |
93 | ||
f3a3214e | 94 | #define hex(a) (hexchar[(a) & 15]) |
8e9faf27 | 95 | static void format_packet(struct strbuf *out, const char *fmt, va_list args) |
f3a3214e | 96 | { |
f3a3214e | 97 | static char hexchar[] = "0123456789abcdef"; |
8e9faf27 | 98 | size_t orig_len, n; |
f3a3214e | 99 | |
8e9faf27 JK |
100 | orig_len = out->len; |
101 | strbuf_addstr(out, "0000"); | |
102 | strbuf_vaddf(out, fmt, args); | |
103 | n = out->len - orig_len; | |
104 | ||
105 | if (n > LARGE_PACKET_MAX) | |
f3a3214e | 106 | die("protocol error: impossibly long line"); |
8e9faf27 JK |
107 | |
108 | out->buf[orig_len + 0] = hex(n >> 12); | |
109 | out->buf[orig_len + 1] = hex(n >> 8); | |
110 | out->buf[orig_len + 2] = hex(n >> 4); | |
111 | out->buf[orig_len + 3] = hex(n); | |
112 | packet_trace(out->buf + orig_len + 4, n - 4, 1); | |
f5615d24 SP |
113 | } |
114 | ||
115 | void packet_write(int fd, const char *fmt, ...) | |
116 | { | |
8e9faf27 | 117 | static struct strbuf buf = STRBUF_INIT; |
f5615d24 | 118 | va_list args; |
f5615d24 | 119 | |
8e9faf27 | 120 | strbuf_reset(&buf); |
f5615d24 | 121 | va_start(args, fmt); |
8e9faf27 | 122 | format_packet(&buf, fmt, args); |
f5615d24 | 123 | va_end(args); |
8e9faf27 | 124 | write_or_die(fd, buf.buf, buf.len); |
f3a3214e LT |
125 | } |
126 | ||
f5615d24 SP |
127 | void packet_buf_write(struct strbuf *buf, const char *fmt, ...) |
128 | { | |
129 | va_list args; | |
f5615d24 SP |
130 | |
131 | va_start(args, fmt); | |
8e9faf27 | 132 | format_packet(buf, fmt, args); |
f5615d24 | 133 | va_end(args); |
f5615d24 SP |
134 | } |
135 | ||
4981fe75 JK |
136 | static int get_packet_data(int fd, char **src_buf, size_t *src_size, |
137 | void *dst, unsigned size, int options) | |
f3a3214e | 138 | { |
4981fe75 JK |
139 | ssize_t ret; |
140 | ||
141 | if (fd >= 0 && src_buf && *src_buf) | |
142 | die("BUG: multiple sources given to packet_read"); | |
143 | ||
144 | /* Read up to "size" bytes from our source, whatever it is. */ | |
145 | if (src_buf && *src_buf) { | |
146 | ret = size < *src_size ? size : *src_size; | |
147 | memcpy(dst, *src_buf, ret); | |
148 | *src_buf += ret; | |
149 | *src_size -= ret; | |
150 | } else { | |
151 | ret = read_in_full(fd, dst, size); | |
152 | if (ret < 0) | |
153 | die_errno("read error"); | |
154 | } | |
155 | ||
156 | /* And complain if we didn't get enough bytes to satisfy the read. */ | |
157 | if (ret < size) { | |
03809429 | 158 | if (options & PACKET_READ_GENTLE_ON_EOF) |
46284dd1 HV |
159 | return -1; |
160 | ||
c697ad14 | 161 | die("The remote end hung up unexpectedly"); |
46284dd1 HV |
162 | } |
163 | ||
164 | return ret; | |
f3a3214e LT |
165 | } |
166 | ||
f5615d24 | 167 | static int packet_length(const char *linelen) |
f3a3214e LT |
168 | { |
169 | int n; | |
f5615d24 | 170 | int len = 0; |
f3a3214e | 171 | |
f3a3214e LT |
172 | for (n = 0; n < 4; n++) { |
173 | unsigned char c = linelen[n]; | |
174 | len <<= 4; | |
175 | if (c >= '0' && c <= '9') { | |
176 | len += c - '0'; | |
177 | continue; | |
178 | } | |
179 | if (c >= 'a' && c <= 'f') { | |
180 | len += c - 'a' + 10; | |
181 | continue; | |
182 | } | |
183 | if (c >= 'A' && c <= 'F') { | |
184 | len += c - 'A' + 10; | |
185 | continue; | |
186 | } | |
f5615d24 | 187 | return -1; |
f3a3214e | 188 | } |
f5615d24 SP |
189 | return len; |
190 | } | |
191 | ||
4981fe75 JK |
192 | int packet_read(int fd, char **src_buf, size_t *src_len, |
193 | char *buffer, unsigned size, int options) | |
f5615d24 | 194 | { |
46284dd1 | 195 | int len, ret; |
f5615d24 SP |
196 | char linelen[4]; |
197 | ||
4981fe75 | 198 | ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options); |
03809429 | 199 | if (ret < 0) |
46284dd1 | 200 | return ret; |
f5615d24 SP |
201 | len = packet_length(linelen); |
202 | if (len < 0) | |
743c4b7b | 203 | die("protocol error: bad line length character: %.4s", linelen); |
bbc30f99 JK |
204 | if (!len) { |
205 | packet_trace("0000", 4, 0); | |
f3a3214e | 206 | return 0; |
bbc30f99 | 207 | } |
f3a3214e LT |
208 | len -= 4; |
209 | if (len >= size) | |
210 | die("protocol error: bad line length %d", len); | |
4981fe75 | 211 | ret = get_packet_data(fd, src_buf, src_len, buffer, len, options); |
03809429 | 212 | if (ret < 0) |
46284dd1 | 213 | return ret; |
819b929d JK |
214 | |
215 | if ((options & PACKET_READ_CHOMP_NEWLINE) && | |
216 | len && buffer[len-1] == '\n') | |
217 | len--; | |
218 | ||
f3a3214e | 219 | buffer[len] = 0; |
bbc30f99 | 220 | packet_trace(buffer, len, 0); |
f3a3214e LT |
221 | return len; |
222 | } | |
f5615d24 | 223 | |
4981fe75 JK |
224 | static char *packet_read_line_generic(int fd, |
225 | char **src, size_t *src_len, | |
226 | int *dst_len) | |
46284dd1 | 227 | { |
4981fe75 JK |
228 | int len = packet_read(fd, src, src_len, |
229 | packet_buffer, sizeof(packet_buffer), | |
74543a04 | 230 | PACKET_READ_CHOMP_NEWLINE); |
4981fe75 JK |
231 | if (dst_len) |
232 | *dst_len = len; | |
74543a04 | 233 | return len ? packet_buffer : NULL; |
46284dd1 HV |
234 | } |
235 | ||
4981fe75 | 236 | char *packet_read_line(int fd, int *len_p) |
f5615d24 | 237 | { |
4981fe75 JK |
238 | return packet_read_line_generic(fd, NULL, NULL, len_p); |
239 | } | |
f5615d24 | 240 | |
4981fe75 JK |
241 | char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len) |
242 | { | |
243 | return packet_read_line_generic(-1, src, src_len, dst_len); | |
f5615d24 | 244 | } |