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1 | #include "pkt-line.h" | |
2 | #include "sideband.h" | |
3 | ||
4 | /* | |
5 | * Receive multiplexed output stream over git native protocol. | |
6 | * in_stream is the input stream from the remote, which carries data | |
7 | * in pkt_line format with band designator. Demultiplex it into out | |
8 | * and err and return error appropriately. Band #1 carries the | |
9 | * primary payload. Things coming over band #2 is not necessarily | |
10 | * error; they are usually informative message on the standard error | |
11 | * stream, aka "verbose"). A message over band #3 is a signal that | |
12 | * the remote died unexpectedly. A flush() concludes the stream. | |
13 | */ | |
14 | ||
15 | #define PREFIX "remote:" | |
16 | ||
17 | #define ANSI_SUFFIX "\033[K" | |
18 | #define DUMB_SUFFIX " " | |
19 | ||
20 | #define FIX_SIZE 10 /* large enough for any of the above */ | |
21 | ||
22 | int recv_sideband(const char *me, int in_stream, int out, int err) | |
23 | { | |
24 | unsigned pf = strlen(PREFIX); | |
25 | unsigned sf; | |
26 | char buf[LARGE_PACKET_MAX + 2*FIX_SIZE]; | |
27 | char *suffix, *term; | |
28 | ||
29 | memcpy(buf, PREFIX, pf); | |
30 | term = getenv("TERM"); | |
31 | if (term && strcmp(term, "dumb")) | |
32 | suffix = ANSI_SUFFIX; | |
33 | else | |
34 | suffix = DUMB_SUFFIX; | |
35 | sf = strlen(suffix); | |
36 | ||
37 | while (1) { | |
38 | int band, len; | |
39 | len = packet_read_line(in_stream, buf + pf, LARGE_PACKET_MAX); | |
40 | if (len == 0) | |
41 | break; | |
42 | if (len < 1) { | |
43 | len = sprintf(buf, "%s: protocol error: no band designator\n", me); | |
44 | safe_write(err, buf, len); | |
45 | return SIDEBAND_PROTOCOL_ERROR; | |
46 | } | |
47 | band = buf[pf] & 0xff; | |
48 | len--; | |
49 | switch (band) { | |
50 | case 3: | |
51 | buf[pf] = ' '; | |
52 | buf[pf+1+len] = '\n'; | |
53 | safe_write(err, buf, pf+1+len+1); | |
54 | return SIDEBAND_REMOTE_ERROR; | |
55 | case 2: | |
56 | buf[pf] = ' '; | |
57 | len += pf+1; | |
58 | while (1) { | |
59 | int brk = pf+1; | |
60 | ||
61 | /* Break the buffer into separate lines. */ | |
62 | while (brk < len) { | |
63 | brk++; | |
64 | if (buf[brk-1] == '\n' || | |
65 | buf[brk-1] == '\r') | |
66 | break; | |
67 | } | |
68 | ||
69 | /* | |
70 | * Let's insert a suffix to clear the end | |
71 | * of the screen line, but only if current | |
72 | * line data actually contains something. | |
73 | */ | |
74 | if (brk > pf+1 + 1) { | |
75 | char save[FIX_SIZE]; | |
76 | memcpy(save, buf + brk, sf); | |
77 | buf[brk + sf - 1] = buf[brk - 1]; | |
78 | memcpy(buf + brk - 1, suffix, sf); | |
79 | safe_write(err, buf, brk + sf); | |
80 | memcpy(buf + brk, save, sf); | |
81 | } else | |
82 | safe_write(err, buf, brk); | |
83 | ||
84 | if (brk < len) { | |
85 | memmove(buf + pf+1, buf + brk, len - brk); | |
86 | len = len - brk + pf+1; | |
87 | } else | |
88 | break; | |
89 | } | |
90 | continue; | |
91 | case 1: | |
92 | safe_write(out, buf + pf+1, len); | |
93 | continue; | |
94 | default: | |
95 | len = sprintf(buf, | |
96 | "%s: protocol error: bad band #%d\n", | |
97 | me, band); | |
98 | safe_write(err, buf, len); | |
99 | return SIDEBAND_PROTOCOL_ERROR; | |
100 | } | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
105 | /* | |
106 | * fd is connected to the remote side; send the sideband data | |
107 | * over multiplexed packet stream. | |
108 | */ | |
109 | ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max) | |
110 | { | |
111 | ssize_t ssz = sz; | |
112 | const char *p = data; | |
113 | ||
114 | while (sz) { | |
115 | unsigned n; | |
116 | char hdr[5]; | |
117 | ||
118 | n = sz; | |
119 | if (packet_max - 5 < n) | |
120 | n = packet_max - 5; | |
121 | sprintf(hdr, "%04x", n + 5); | |
122 | hdr[4] = band; | |
123 | safe_write(fd, hdr, 5); | |
124 | safe_write(fd, p, n); | |
125 | p += n; | |
126 | sz -= n; | |
127 | } | |
128 | return ssz; | |
129 | } |