1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
* This file is part of the Green End SFTP Server.
* Copyright (C) 2007, 2011 Richard Kettlewell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/** @file send.c @brief Message sending implementation */
#include "sftpserver.h"
#include "debug.h"
#include "utils.h"
#include "handle.h"
#include "send.h"
#include "thread.h"
#include "types.h"
#include "globals.h"
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include "putword.h"
#if NTHREADS > 1
/** @brief Mutex to serialize IO */
static pthread_mutex_t output_lock = PTHREAD_MUTEX_INITIALIZER;
#endif
int sftpout = 1; /* default is stdout */
/** @brief Store a 16-bit value */
#define sftp_send_raw16(u) do { \
put16(&w->buffer[w->bufused], u); \
w->bufused += 2; \
} while(0)
/** @brief Store a 32-bit value */
#define sftp_send_raw32(u) do { \
put32(&w->buffer[w->bufused], u); \
w->bufused += 4; \
} while(0)
/** @brief Store a 64-bit value */
#define sftp_send_raw64(u) do { \
put64(&w->buffer[w->bufused], u); \
w->bufused += 8; \
} while(0)
void sftp_send_need(struct worker *w, size_t n) {
assert(w->bufused < 0x80000000);
if(n > w->bufsize - w->bufused) {
size_t newsize = w->bufsize ? w->bufsize : 64;
while(newsize && newsize < w->bufsize + n)
newsize <<= 1;
if(!newsize)
fatal("sftp_send_need: out of memory (%zu)", n);
w->buffer = xrealloc(w->buffer, w->bufsize = newsize);
}
}
void sftp_send_begin(struct worker *w) {
w->bufused = 0;
sftp_send_uint32(w, 0); /* placeholder for length */
}
void sftp_send_end(struct worker *w) {
ssize_t n, written;
assert(w->bufused < 0x80000000);
/* Fill in length word. The malloc'd area is assumed to be aligned
* suitably. */
*(uint32_t *)w->buffer = htonl(w->bufused - 4);
/* Write the complete output, protecting stdout with a lock to avoid
* interleaving different responses. */
ferrcheck(pthread_mutex_lock(&output_lock));
if(sftp_debugging) {
D(("%s:", sendtype));
sftp_debug_hexdump(w->buffer + 4, w->bufused - 4);
}
/* Write the whole buffer, coping with short writes */
written = 0;
while((size_t)written < w->bufused)
if((n = write(sftpout, w->buffer + written, w->bufused - written)) > 0)
written += n;
else if(n < 0)
fatal("error sending response: %s", strerror(errno));
ferrcheck(pthread_mutex_unlock(&output_lock));
w->bufused = 0x80000000;
}
void sftp_send_uint8(struct worker *w, int n) {
sftp_send_need(w, 1);
w->buffer[w->bufused++] = (uint8_t)n;
}
void sftp_send_uint16(struct worker *w, uint16_t u) {
sftp_send_need(w, 2);
sftp_send_raw16(u);
}
void sftp_send_uint32(struct worker *w, uint32_t u) {
sftp_send_need(w, 4);
sftp_send_raw32(u);
}
void sftp_send_uint64(struct worker *w, uint64_t u) {
sftp_send_need(w, 8);
sftp_send_raw64(u);
}
void sftp_send_bytes(struct worker *w, const void *bytes, size_t n) {
sftp_send_need(w, n + 4);
sftp_send_raw32(n);
memcpy(w->buffer + w->bufused, bytes, n);
w->bufused += n;
}
void sftp_send_string(struct worker *w, const char *s) {
sftp_send_bytes(w, s, strlen(s));
}
void sftp_send_path(struct sftpjob *job, struct worker *w, const char *path) {
if(protocol->encode(job, (char **)&path))
fatal("cannot encode local path name '%s'", path);
sftp_send_string(w, path);
}
void sftp_send_handle(struct worker *w, const struct handleid *id) {
sftp_send_need(w, 12);
sftp_send_raw32(8);
sftp_send_raw32(id->id);
sftp_send_raw32(id->tag);
}
size_t sftp_send_sub_begin(struct worker *w) {
sftp_send_need(w, 4);
w->bufused += 4;
return w->bufused;
}
void sftp_send_sub_end(struct worker *w, size_t offset) {
const size_t latest = w->bufused;
w->bufused = offset - 4;
sftp_send_raw32(latest - offset);
w->bufused = latest;
}
/*
Local Variables:
c-basic-offset:2
comment-column:40
fill-column:79
indent-tabs-mode:nil
End:
*/
|
