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f3a3214e LT |
1 | #ifndef PKTLINE_H |
2 | #define PKTLINE_H | |
3 | ||
07d68930 | 4 | #include "git-compat-util.h" |
f5615d24 | 5 | #include "strbuf.h" |
fbd76cd4 | 6 | #include "sideband.h" |
07d68930 | 7 | |
f3a3214e | 8 | /* |
e1485428 JK |
9 | * Write a packetized stream, where each line is preceded by |
10 | * its length (including the header) as a 4-byte hex number. | |
11 | * A length of 'zero' means end of stream (and a length of 1-3 | |
12 | * would be an error). | |
13 | * | |
14 | * This is all pretty stupid, but we use this packetized line | |
15 | * format to make a streaming format possible without ever | |
16 | * over-running the read buffers. That way we'll never read | |
17 | * into what might be the pack data (which should go to another | |
18 | * process entirely). | |
19 | * | |
20 | * The writing side could use stdio, but since the reading | |
21 | * side can't, we stay with pure read/write interfaces. | |
f3a3214e LT |
22 | */ |
23 | void packet_flush(int fd); | |
a4cfd41c | 24 | void packet_delim(int fd); |
0181b600 | 25 | void packet_response_end(int fd); |
81c634e9 | 26 | void packet_write_fmt(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3))); |
f5615d24 | 27 | void packet_buf_flush(struct strbuf *buf); |
a4cfd41c | 28 | void packet_buf_delim(struct strbuf *buf); |
a97d0079 | 29 | void set_packet_header(char *buf, int size); |
5d2124b3 | 30 | void packet_write(int fd_out, const char *buf, size_t size); |
f5615d24 | 31 | void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3))); |
f1f4d8ac | 32 | void packet_buf_write_len(struct strbuf *buf, const char *data, size_t len); |
038ce90f | 33 | int packet_flush_gently(int fd); |
70428d1a | 34 | int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3))); |
bb643d8b LS |
35 | int write_packetized_from_fd(int fd_in, int fd_out); |
36 | int write_packetized_from_buf(const char *src_in, size_t len, int fd_out); | |
f3a3214e | 37 | |
03809429 | 38 | /* |
4981fe75 JK |
39 | * Read a packetized line into the buffer, which must be at least size bytes |
40 | * long. The return value specifies the number of bytes read into the buffer. | |
41 | * | |
01689909 JL |
42 | * If src_buffer and *src_buffer are not NULL, it should point to a buffer |
43 | * containing the packet data to parse, of at least *src_len bytes. After the | |
44 | * function returns, src_buf will be incremented and src_len decremented by the | |
45 | * number of bytes consumed. | |
4981fe75 JK |
46 | * |
47 | * If src_buffer (or *src_buffer) is NULL, then data is read from the | |
48 | * descriptor "fd". | |
03809429 JK |
49 | * |
50 | * If options does not contain PACKET_READ_GENTLE_ON_EOF, we will die under any | |
51 | * of the following conditions: | |
52 | * | |
53 | * 1. Read error from descriptor. | |
54 | * | |
55 | * 2. Protocol error from the remote (e.g., bogus length characters). | |
56 | * | |
57 | * 3. Receiving a packet larger than "size" bytes. | |
58 | * | |
59 | * 4. Truncated output from the remote (e.g., we expected a packet but got | |
60 | * EOF, or we got a partial packet followed by EOF). | |
61 | * | |
62 | * If options does contain PACKET_READ_GENTLE_ON_EOF, we will not die on | |
63 | * condition 4 (truncated input), but instead return -1. However, we will still | |
64 | * die for the other 3 conditions. | |
819b929d JK |
65 | * |
66 | * If options contains PACKET_READ_CHOMP_NEWLINE, a trailing newline (if | |
67 | * present) is removed from the buffer before returning. | |
2d103c31 MS |
68 | * |
69 | * If options contains PACKET_READ_DIE_ON_ERR_PACKET, it dies when it sees an | |
70 | * ERR packet. | |
03809429 | 71 | */ |
2d103c31 MS |
72 | #define PACKET_READ_GENTLE_ON_EOF (1u<<0) |
73 | #define PACKET_READ_CHOMP_NEWLINE (1u<<1) | |
74 | #define PACKET_READ_DIE_ON_ERR_PACKET (1u<<2) | |
4981fe75 JK |
75 | int packet_read(int fd, char **src_buffer, size_t *src_len, char |
76 | *buffer, unsigned size, int options); | |
03809429 | 77 | |
101736a1 DL |
78 | /* |
79 | * Convert a four hex digit packet line length header into its numeric | |
80 | * representation. | |
81 | * | |
82 | * If lenbuf_hex contains non-hex characters, return -1. Otherwise, return the | |
83 | * numeric value of the length header. | |
84 | */ | |
85 | int packet_length(const char lenbuf_hex[4]); | |
86 | ||
2153d478 BW |
87 | /* |
88 | * Read a packetized line into a buffer like the 'packet_read()' function but | |
89 | * returns an 'enum packet_read_status' which indicates the status of the read. | |
a4fb016b | 90 | * The number of bytes read will be assigned to *pktlen if the status of the |
2153d478 BW |
91 | * read was 'PACKET_READ_NORMAL'. |
92 | */ | |
93 | enum packet_read_status { | |
94 | PACKET_READ_EOF, | |
95 | PACKET_READ_NORMAL, | |
96 | PACKET_READ_FLUSH, | |
a4cfd41c | 97 | PACKET_READ_DELIM, |
0181b600 | 98 | PACKET_READ_RESPONSE_END, |
2153d478 BW |
99 | }; |
100 | enum packet_read_status packet_read_with_status(int fd, char **src_buffer, | |
101 | size_t *src_len, char *buffer, | |
102 | unsigned size, int *pktlen, | |
103 | int options); | |
104 | ||
819b929d JK |
105 | /* |
106 | * Convenience wrapper for packet_read that is not gentle, and sets the | |
74543a04 JK |
107 | * CHOMP_NEWLINE option. The return value is NULL for a flush packet, |
108 | * and otherwise points to a static buffer (that may be overwritten by | |
109 | * subsequent calls). If the size parameter is not NULL, the length of the | |
110 | * packet is written to it. | |
819b929d | 111 | */ |
74543a04 JK |
112 | char *packet_read_line(int fd, int *size); |
113 | ||
825b9226 BP |
114 | /* |
115 | * Convenience wrapper for packet_read that sets the PACKET_READ_GENTLE_ON_EOF | |
116 | * and CHOMP_NEWLINE options. The return value specifies the number of bytes | |
117 | * read into the buffer or -1 on truncated input. If the *dst_line parameter | |
118 | * is not NULL it will return NULL for a flush packet or when the number of | |
119 | * bytes copied is zero and otherwise points to a static buffer (that may be | |
120 | * overwritten by subsequent calls). If the size parameter is not NULL, the | |
121 | * length of the packet is written to it. | |
122 | */ | |
123 | int packet_read_line_gently(int fd, int *size, char **dst_line); | |
124 | ||
4981fe75 JK |
125 | /* |
126 | * Same as packet_read_line, but read from a buf rather than a descriptor; | |
127 | * see packet_read for details on how src_* is used. | |
128 | */ | |
129 | char *packet_read_line_buf(char **src_buf, size_t *src_len, int *size); | |
03809429 | 130 | |
bb643d8b LS |
131 | /* |
132 | * Reads a stream of variable sized packets until a flush packet is detected. | |
133 | */ | |
134 | ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out); | |
135 | ||
fbd76cd4 JT |
136 | /* |
137 | * Receive multiplexed output stream over git native protocol. | |
138 | * in_stream is the input stream from the remote, which carries data | |
139 | * in pkt_line format with band designator. Demultiplex it into out | |
140 | * and err and return error appropriately. Band #1 carries the | |
141 | * primary payload. Things coming over band #2 is not necessarily | |
142 | * error; they are usually informative message on the standard error | |
143 | * stream, aka "verbose"). A message over band #3 is a signal that | |
144 | * the remote died unexpectedly. A flush() concludes the stream. | |
145 | * | |
146 | * Returns SIDEBAND_FLUSH upon a normal conclusion, and SIDEBAND_PROTOCOL_ERROR | |
147 | * or SIDEBAND_REMOTE_ERROR if an error occurred. | |
148 | */ | |
149 | int recv_sideband(const char *me, int in_stream, int out); | |
150 | ||
77dabc14 BW |
151 | struct packet_reader { |
152 | /* source file descriptor */ | |
153 | int fd; | |
154 | ||
155 | /* source buffer and its size */ | |
156 | char *src_buffer; | |
157 | size_t src_len; | |
158 | ||
159 | /* buffer that pkt-lines are read into and its size */ | |
160 | char *buffer; | |
161 | unsigned buffer_size; | |
162 | ||
163 | /* options to be used during reads */ | |
164 | int options; | |
165 | ||
166 | /* status of the last read */ | |
167 | enum packet_read_status status; | |
168 | ||
169 | /* length of data read during the last read */ | |
170 | int pktlen; | |
171 | ||
172 | /* the last line read */ | |
173 | const char *line; | |
174 | ||
175 | /* indicates if a line has been peeked */ | |
176 | int line_peeked; | |
0bbc0bc5 JT |
177 | |
178 | unsigned use_sideband : 1; | |
179 | const char *me; | |
77dabc14 BW |
180 | }; |
181 | ||
182 | /* | |
183 | * Initialize a 'struct packet_reader' object which is an | |
184 | * abstraction around the 'packet_read_with_status()' function. | |
185 | */ | |
55454427 | 186 | void packet_reader_init(struct packet_reader *reader, int fd, |
ad6dad09 DL |
187 | char *src_buffer, size_t src_len, |
188 | int options); | |
77dabc14 BW |
189 | |
190 | /* | |
191 | * Perform a packet read and return the status of the read. | |
192 | * The values of 'pktlen' and 'line' are updated based on the status of the | |
193 | * read as follows: | |
194 | * | |
195 | * PACKET_READ_ERROR: 'pktlen' is set to '-1' and 'line' is set to NULL | |
196 | * PACKET_READ_NORMAL: 'pktlen' is set to the number of bytes read | |
197 | * 'line' is set to point at the read line | |
198 | * PACKET_READ_FLUSH: 'pktlen' is set to '0' and 'line' is set to NULL | |
199 | */ | |
55454427 | 200 | enum packet_read_status packet_reader_read(struct packet_reader *reader); |
77dabc14 BW |
201 | |
202 | /* | |
203 | * Peek the next packet line without consuming it and return the status. | |
204 | * The next call to 'packet_reader_read()' will perform a read of the same line | |
205 | * that was peeked, consuming the line. | |
206 | * | |
207 | * Peeking multiple times without calling 'packet_reader_read()' will return | |
208 | * the same result. | |
209 | */ | |
55454427 | 210 | enum packet_read_status packet_reader_peek(struct packet_reader *reader); |
77dabc14 | 211 | |
047ec602 JK |
212 | #define DEFAULT_PACKET_MAX 1000 |
213 | #define LARGE_PACKET_MAX 65520 | |
bb643d8b | 214 | #define LARGE_PACKET_DATA_MAX (LARGE_PACKET_MAX - 4) |
74543a04 | 215 | extern char packet_buffer[LARGE_PACKET_MAX]; |
047ec602 | 216 | |
bc2e795c JT |
217 | struct packet_writer { |
218 | int dest_fd; | |
0bbc0bc5 | 219 | unsigned use_sideband : 1; |
bc2e795c JT |
220 | }; |
221 | ||
222 | void packet_writer_init(struct packet_writer *writer, int dest_fd); | |
223 | ||
224 | /* These functions die upon failure. */ | |
225 | __attribute__((format (printf, 2, 3))) | |
226 | void packet_writer_write(struct packet_writer *writer, const char *fmt, ...); | |
227 | __attribute__((format (printf, 2, 3))) | |
228 | void packet_writer_error(struct packet_writer *writer, const char *fmt, ...); | |
229 | void packet_writer_delim(struct packet_writer *writer); | |
230 | void packet_writer_flush(struct packet_writer *writer); | |
231 | ||
f3a3214e | 232 | #endif |