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
|
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "utils.h"
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
const char *progname = NULL;
int port = 1234;
int listen_queue = 100;
const char *basedir = "/var/tmp";
static void
recvfile (int fd)
{
ssize_t rc;
int dfd = -1;
char *filename = NULL;
size_t filename_len;
off_t filelength = 0;
char *buf = malloc (PATH_MAX);
if (!buf)
{
warning ("failed to allocate space");
goto clean;
}
rc = read (fd, buf, PATH_MAX); /* filename\0payload */
if (rc < 0)
{
warning ("failed to read filename");
goto clean;
}
else if (0 == rc)
{
info ("no data received, connection closed by client");
goto clean;
}
/* XXX no subdirs. */
filename = strndup (buf, PATH_MAX);
if (!filename)
{
warning ("failed to create filename");
goto clean;
}
filename_len = strlen (filename);
dfd =
openat (AT_FDCWD, filename, O_CREAT + O_WRONLY,
S_IRUSR | S_IWUSR | S_IRGRP);
if (dfd < 0)
{
warning ("failed to open file `%s'", filename);
goto clean;
}
char *payload_start = buf + filename_len + 1;
ssize_t rest_len = rc - filename_len - 1;
rc = write (dfd, payload_start, rest_len); /* write the rest of buf. */
if (rc != rest_len)
{
warning ("Failed to write `%s'", filename);
goto clean;
}
filelength += rc;
while ((rc = read (fd, buf, PATH_MAX)) > 0)
{
if (write (dfd, buf, rc) < 0)
{
warning ("failed to write `%s'", filename);
goto clean;
}
filelength += rc;
}
info ("received %lu of `%s'", filelength, filename);
clean:
if (buf)
free (buf);
if (filename)
free (filename);
if (dfd > 0)
{
if (close (dfd))
{
warning ("failed to close %d", dfd);
}
}
}
int
main (int argc, char **argv)
{
NOTUSED (argc);
int listen_fd;
int conn_fd;
struct sockaddr_in servaddr;
int rc;
progname = argv[0];
if (chdir (basedir))
{
fatal ("failed to change directory to `%s'", basedir);
}
listen_fd = socket (AF_INET, SOCK_STREAM, 0);
if (listen_fd < 0)
{
fatal ("failed to create listen socket");
}
memset (&servaddr, 0, sizeof (servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl (INADDR_ANY);
servaddr.sin_port = htons (port);
rc = bind (listen_fd, (const struct sockaddr *) &servaddr,
sizeof (servaddr));
if (0 != rc)
{
fatal ("failed to bind listen socket");
}
rc = listen (listen_fd, listen_queue);
if (0 != rc)
{
fatal ("failed to plug listen socket");
}
info ("accepting connections on port %d", port);
info ("will save files under `%s'", basedir);
while (1)
{
conn_fd = accept (listen_fd, NULL, NULL);
if (conn_fd < 0)
{
warning ("accept() failed");
continue;
}
recvfile (conn_fd);
}
return EXIT_SUCCESS;
}
|
