Merge branch 'lt/gpg-show-long-key-in-signature-verification-maint' into lt/gpg-show...
[git] / pkt-line.c
1 #include "cache.h"
2 #include "pkt-line.h"
3 #include "run-command.h"
4
5 char packet_buffer[LARGE_PACKET_MAX];
6 static const char *packet_trace_prefix = "git";
7 static struct trace_key trace_packet = TRACE_KEY_INIT(PACKET);
8 static struct trace_key trace_pack = TRACE_KEY_INIT(PACKFILE);
9
10 void packet_trace_identity(const char *prog)
11 {
12         packet_trace_prefix = xstrdup(prog);
13 }
14
15 static const char *get_trace_prefix(void)
16 {
17         return in_async() ? "sideband" : packet_trace_prefix;
18 }
19
20 static int packet_trace_pack(const char *buf, unsigned int len, int sideband)
21 {
22         if (!sideband) {
23                 trace_verbatim(&trace_pack, buf, len);
24                 return 1;
25         } else if (len && *buf == '\1') {
26                 trace_verbatim(&trace_pack, buf + 1, len - 1);
27                 return 1;
28         } else {
29                 /* it's another non-pack sideband */
30                 return 0;
31         }
32 }
33
34 static void packet_trace(const char *buf, unsigned int len, int write)
35 {
36         int i;
37         struct strbuf out;
38         static int in_pack, sideband;
39
40         if (!trace_want(&trace_packet) && !trace_want(&trace_pack))
41                 return;
42
43         if (in_pack) {
44                 if (packet_trace_pack(buf, len, sideband))
45                         return;
46         } else if (starts_with(buf, "PACK") || starts_with(buf, "\1PACK")) {
47                 in_pack = 1;
48                 sideband = *buf == '\1';
49                 packet_trace_pack(buf, len, sideband);
50
51                 /*
52                  * Make a note in the human-readable trace that the pack data
53                  * started.
54                  */
55                 buf = "PACK ...";
56                 len = strlen(buf);
57         }
58
59         if (!trace_want(&trace_packet))
60                 return;
61
62         /* +32 is just a guess for header + quoting */
63         strbuf_init(&out, len+32);
64
65         strbuf_addf(&out, "packet: %12s%c ",
66                     get_trace_prefix(), write ? '>' : '<');
67
68         /* XXX we should really handle printable utf8 */
69         for (i = 0; i < len; i++) {
70                 /* suppress newlines */
71                 if (buf[i] == '\n')
72                         continue;
73                 if (buf[i] >= 0x20 && buf[i] <= 0x7e)
74                         strbuf_addch(&out, buf[i]);
75                 else
76                         strbuf_addf(&out, "\\%o", buf[i]);
77         }
78
79         strbuf_addch(&out, '\n');
80         trace_strbuf(&trace_packet, &out);
81         strbuf_release(&out);
82 }
83
84 /*
85  * If we buffered things up above (we don't, but we should),
86  * we'd flush it here
87  */
88 void packet_flush(int fd)
89 {
90         packet_trace("0000", 4, 1);
91         write_or_die(fd, "0000", 4);
92 }
93
94 void packet_buf_flush(struct strbuf *buf)
95 {
96         packet_trace("0000", 4, 1);
97         strbuf_add(buf, "0000", 4);
98 }
99
100 #define hex(a) (hexchar[(a) & 15])
101 static void format_packet(struct strbuf *out, const char *fmt, va_list args)
102 {
103         static char hexchar[] = "0123456789abcdef";
104         size_t orig_len, n;
105
106         orig_len = out->len;
107         strbuf_addstr(out, "0000");
108         strbuf_vaddf(out, fmt, args);
109         n = out->len - orig_len;
110
111         if (n > LARGE_PACKET_MAX)
112                 die("protocol error: impossibly long line");
113
114         out->buf[orig_len + 0] = hex(n >> 12);
115         out->buf[orig_len + 1] = hex(n >> 8);
116         out->buf[orig_len + 2] = hex(n >> 4);
117         out->buf[orig_len + 3] = hex(n);
118         packet_trace(out->buf + orig_len + 4, n - 4, 1);
119 }
120
121 void packet_write(int fd, const char *fmt, ...)
122 {
123         static struct strbuf buf = STRBUF_INIT;
124         va_list args;
125
126         strbuf_reset(&buf);
127         va_start(args, fmt);
128         format_packet(&buf, fmt, args);
129         va_end(args);
130         write_or_die(fd, buf.buf, buf.len);
131 }
132
133 void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
134 {
135         va_list args;
136
137         va_start(args, fmt);
138         format_packet(buf, fmt, args);
139         va_end(args);
140 }
141
142 static int get_packet_data(int fd, char **src_buf, size_t *src_size,
143                            void *dst, unsigned size, int options)
144 {
145         ssize_t ret;
146
147         if (fd >= 0 && src_buf && *src_buf)
148                 die("BUG: multiple sources given to packet_read");
149
150         /* Read up to "size" bytes from our source, whatever it is. */
151         if (src_buf && *src_buf) {
152                 ret = size < *src_size ? size : *src_size;
153                 memcpy(dst, *src_buf, ret);
154                 *src_buf += ret;
155                 *src_size -= ret;
156         } else {
157                 ret = read_in_full(fd, dst, size);
158                 if (ret < 0)
159                         die_errno("read error");
160         }
161
162         /* And complain if we didn't get enough bytes to satisfy the read. */
163         if (ret < size) {
164                 if (options & PACKET_READ_GENTLE_ON_EOF)
165                         return -1;
166
167                 die("The remote end hung up unexpectedly");
168         }
169
170         return ret;
171 }
172
173 static int packet_length(const char *linelen)
174 {
175         int n;
176         int len = 0;
177
178         for (n = 0; n < 4; n++) {
179                 unsigned char c = linelen[n];
180                 len <<= 4;
181                 if (c >= '0' && c <= '9') {
182                         len += c - '0';
183                         continue;
184                 }
185                 if (c >= 'a' && c <= 'f') {
186                         len += c - 'a' + 10;
187                         continue;
188                 }
189                 if (c >= 'A' && c <= 'F') {
190                         len += c - 'A' + 10;
191                         continue;
192                 }
193                 return -1;
194         }
195         return len;
196 }
197
198 int packet_read(int fd, char **src_buf, size_t *src_len,
199                 char *buffer, unsigned size, int options)
200 {
201         int len, ret;
202         char linelen[4];
203
204         ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options);
205         if (ret < 0)
206                 return ret;
207         len = packet_length(linelen);
208         if (len < 0)
209                 die("protocol error: bad line length character: %.4s", linelen);
210         if (!len) {
211                 packet_trace("0000", 4, 0);
212                 return 0;
213         }
214         len -= 4;
215         if (len >= size)
216                 die("protocol error: bad line length %d", len);
217         ret = get_packet_data(fd, src_buf, src_len, buffer, len, options);
218         if (ret < 0)
219                 return ret;
220
221         if ((options & PACKET_READ_CHOMP_NEWLINE) &&
222             len && buffer[len-1] == '\n')
223                 len--;
224
225         buffer[len] = 0;
226         packet_trace(buffer, len, 0);
227         return len;
228 }
229
230 static char *packet_read_line_generic(int fd,
231                                       char **src, size_t *src_len,
232                                       int *dst_len)
233 {
234         int len = packet_read(fd, src, src_len,
235                               packet_buffer, sizeof(packet_buffer),
236                               PACKET_READ_CHOMP_NEWLINE);
237         if (dst_len)
238                 *dst_len = len;
239         return len ? packet_buffer : NULL;
240 }
241
242 char *packet_read_line(int fd, int *len_p)
243 {
244         return packet_read_line_generic(fd, NULL, NULL, len_p);
245 }
246
247 char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len)
248 {
249         return packet_read_line_generic(-1, src, src_len, dst_len);
250 }