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Commit | Line | Data |
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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"; |
bbc30f99 JK |
6 | static const char trace_key[] = "GIT_TRACE_PACKET"; |
7 | ||
8 | void packet_trace_identity(const char *prog) | |
9 | { | |
10 | packet_trace_prefix = xstrdup(prog); | |
11 | } | |
12 | ||
13 | static void packet_trace(const char *buf, unsigned int len, int write) | |
14 | { | |
15 | int i; | |
16 | struct strbuf out; | |
17 | ||
18 | if (!trace_want(trace_key)) | |
19 | return; | |
20 | ||
21 | /* +32 is just a guess for header + quoting */ | |
22 | strbuf_init(&out, len+32); | |
23 | ||
24 | strbuf_addf(&out, "packet: %12s%c ", | |
25 | packet_trace_prefix, write ? '>' : '<'); | |
26 | ||
59556548 CC |
27 | if ((len >= 4 && starts_with(buf, "PACK")) || |
28 | (len >= 5 && starts_with(buf+1, "PACK"))) { | |
bbc30f99 JK |
29 | strbuf_addstr(&out, "PACK ..."); |
30 | unsetenv(trace_key); | |
31 | } | |
32 | else { | |
33 | /* XXX we should really handle printable utf8 */ | |
34 | for (i = 0; i < len; i++) { | |
35 | /* suppress newlines */ | |
36 | if (buf[i] == '\n') | |
37 | continue; | |
38 | if (buf[i] >= 0x20 && buf[i] <= 0x7e) | |
39 | strbuf_addch(&out, buf[i]); | |
40 | else | |
41 | strbuf_addf(&out, "\\%o", buf[i]); | |
42 | } | |
43 | } | |
44 | ||
45 | strbuf_addch(&out, '\n'); | |
46 | trace_strbuf(trace_key, &out); | |
47 | strbuf_release(&out); | |
48 | } | |
49 | ||
f3a3214e LT |
50 | /* |
51 | * If we buffered things up above (we don't, but we should), | |
52 | * we'd flush it here | |
53 | */ | |
54 | void packet_flush(int fd) | |
55 | { | |
bbc30f99 | 56 | packet_trace("0000", 4, 1); |
cdf4fb8e | 57 | write_or_die(fd, "0000", 4); |
f3a3214e LT |
58 | } |
59 | ||
f5615d24 SP |
60 | void packet_buf_flush(struct strbuf *buf) |
61 | { | |
bbc30f99 | 62 | packet_trace("0000", 4, 1); |
f5615d24 SP |
63 | strbuf_add(buf, "0000", 4); |
64 | } | |
65 | ||
f3a3214e | 66 | #define hex(a) (hexchar[(a) & 15]) |
f5615d24 SP |
67 | static char buffer[1000]; |
68 | static unsigned format_packet(const char *fmt, va_list args) | |
f3a3214e | 69 | { |
f3a3214e | 70 | static char hexchar[] = "0123456789abcdef"; |
f3a3214e LT |
71 | unsigned n; |
72 | ||
f3a3214e | 73 | n = vsnprintf(buffer + 4, sizeof(buffer) - 4, fmt, args); |
f3a3214e LT |
74 | if (n >= sizeof(buffer)-4) |
75 | die("protocol error: impossibly long line"); | |
76 | n += 4; | |
77 | buffer[0] = hex(n >> 12); | |
78 | buffer[1] = hex(n >> 8); | |
79 | buffer[2] = hex(n >> 4); | |
80 | buffer[3] = hex(n); | |
bbc30f99 | 81 | packet_trace(buffer+4, n-4, 1); |
f5615d24 SP |
82 | return n; |
83 | } | |
84 | ||
85 | void packet_write(int fd, const char *fmt, ...) | |
86 | { | |
87 | va_list args; | |
88 | unsigned n; | |
89 | ||
90 | va_start(args, fmt); | |
91 | n = format_packet(fmt, args); | |
92 | va_end(args); | |
cdf4fb8e | 93 | write_or_die(fd, buffer, n); |
f3a3214e LT |
94 | } |
95 | ||
f5615d24 SP |
96 | void packet_buf_write(struct strbuf *buf, const char *fmt, ...) |
97 | { | |
98 | va_list args; | |
99 | unsigned n; | |
100 | ||
101 | va_start(args, fmt); | |
102 | n = format_packet(fmt, args); | |
103 | va_end(args); | |
104 | strbuf_add(buf, buffer, n); | |
105 | } | |
106 | ||
4981fe75 JK |
107 | static int get_packet_data(int fd, char **src_buf, size_t *src_size, |
108 | void *dst, unsigned size, int options) | |
f3a3214e | 109 | { |
4981fe75 JK |
110 | ssize_t ret; |
111 | ||
112 | if (fd >= 0 && src_buf && *src_buf) | |
113 | die("BUG: multiple sources given to packet_read"); | |
114 | ||
115 | /* Read up to "size" bytes from our source, whatever it is. */ | |
116 | if (src_buf && *src_buf) { | |
117 | ret = size < *src_size ? size : *src_size; | |
118 | memcpy(dst, *src_buf, ret); | |
119 | *src_buf += ret; | |
120 | *src_size -= ret; | |
121 | } else { | |
122 | ret = read_in_full(fd, dst, size); | |
123 | if (ret < 0) | |
124 | die_errno("read error"); | |
125 | } | |
126 | ||
127 | /* And complain if we didn't get enough bytes to satisfy the read. */ | |
128 | if (ret < size) { | |
03809429 | 129 | if (options & PACKET_READ_GENTLE_ON_EOF) |
46284dd1 HV |
130 | return -1; |
131 | ||
c697ad14 | 132 | die("The remote end hung up unexpectedly"); |
46284dd1 HV |
133 | } |
134 | ||
135 | return ret; | |
f3a3214e LT |
136 | } |
137 | ||
f5615d24 | 138 | static int packet_length(const char *linelen) |
f3a3214e LT |
139 | { |
140 | int n; | |
f5615d24 | 141 | int len = 0; |
f3a3214e | 142 | |
f3a3214e LT |
143 | for (n = 0; n < 4; n++) { |
144 | unsigned char c = linelen[n]; | |
145 | len <<= 4; | |
146 | if (c >= '0' && c <= '9') { | |
147 | len += c - '0'; | |
148 | continue; | |
149 | } | |
150 | if (c >= 'a' && c <= 'f') { | |
151 | len += c - 'a' + 10; | |
152 | continue; | |
153 | } | |
154 | if (c >= 'A' && c <= 'F') { | |
155 | len += c - 'A' + 10; | |
156 | continue; | |
157 | } | |
f5615d24 | 158 | return -1; |
f3a3214e | 159 | } |
f5615d24 SP |
160 | return len; |
161 | } | |
162 | ||
4981fe75 JK |
163 | int packet_read(int fd, char **src_buf, size_t *src_len, |
164 | char *buffer, unsigned size, int options) | |
f5615d24 | 165 | { |
46284dd1 | 166 | int len, ret; |
f5615d24 SP |
167 | char linelen[4]; |
168 | ||
4981fe75 | 169 | ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options); |
03809429 | 170 | if (ret < 0) |
46284dd1 | 171 | return ret; |
f5615d24 SP |
172 | len = packet_length(linelen); |
173 | if (len < 0) | |
743c4b7b | 174 | die("protocol error: bad line length character: %.4s", linelen); |
bbc30f99 JK |
175 | if (!len) { |
176 | packet_trace("0000", 4, 0); | |
f3a3214e | 177 | return 0; |
bbc30f99 | 178 | } |
f3a3214e LT |
179 | len -= 4; |
180 | if (len >= size) | |
181 | die("protocol error: bad line length %d", len); | |
4981fe75 | 182 | ret = get_packet_data(fd, src_buf, src_len, buffer, len, options); |
03809429 | 183 | if (ret < 0) |
46284dd1 | 184 | return ret; |
819b929d JK |
185 | |
186 | if ((options & PACKET_READ_CHOMP_NEWLINE) && | |
187 | len && buffer[len-1] == '\n') | |
188 | len--; | |
189 | ||
f3a3214e | 190 | buffer[len] = 0; |
bbc30f99 | 191 | packet_trace(buffer, len, 0); |
f3a3214e LT |
192 | return len; |
193 | } | |
f5615d24 | 194 | |
4981fe75 JK |
195 | static char *packet_read_line_generic(int fd, |
196 | char **src, size_t *src_len, | |
197 | int *dst_len) | |
46284dd1 | 198 | { |
4981fe75 JK |
199 | int len = packet_read(fd, src, src_len, |
200 | packet_buffer, sizeof(packet_buffer), | |
74543a04 | 201 | PACKET_READ_CHOMP_NEWLINE); |
4981fe75 JK |
202 | if (dst_len) |
203 | *dst_len = len; | |
74543a04 | 204 | return len ? packet_buffer : NULL; |
46284dd1 HV |
205 | } |
206 | ||
4981fe75 | 207 | char *packet_read_line(int fd, int *len_p) |
f5615d24 | 208 | { |
4981fe75 JK |
209 | return packet_read_line_generic(fd, NULL, NULL, len_p); |
210 | } | |
f5615d24 | 211 | |
4981fe75 JK |
212 | char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len) |
213 | { | |
214 | return packet_read_line_generic(-1, src, src_len, dst_len); | |
f5615d24 | 215 | } |