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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 0211-1301 USA */
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <errno.h>
#include "xlog.h"
#include "rpcmisc.h"
#include "nfslib.h"
#include "config.h"
#ifdef _LIBC
# include <libintl.h>
#else
# ifndef _
# define _(s) (s)
# endif
# define __socket(d, t, p) socket ((d), (t), (p))
# define __close(f) close ((f))
#endif
int getservport(u_long number, const char *proto)
{
char servdata[1024];
struct rpcent *rpcp;
struct servent servbuf, *servp = NULL;
int ret = 0;
#ifdef HAVE_GETRPCBYNUMBER_R
char rpcdata[1024];
struct rpcent rpcbuf;
ret = getrpcbynumber_r(number, &rpcbuf, rpcdata, sizeof rpcdata,
&rpcp);
#else
rpcp = getrpcbynumber(number);
#endif
if (ret == 0 && rpcp != NULL) {
/* First try name. */
ret = getservbyname_r(rpcp->r_name, proto, &servbuf, servdata,
sizeof servdata, &servp);
if ((ret != 0 || servp == NULL) && rpcp->r_aliases) {
const char **a;
/* Then we try aliases. */
for (a = (const char **) rpcp->r_aliases; *a != NULL; a++) {
ret = getservbyname_r(*a, proto, &servbuf, servdata,
sizeof servdata, &servp);
if (ret == 0 && servp != NULL)
break;
}
}
}
if (ret == 0 && servp != NULL)
return ntohs(servp->s_port);
return 0;
}
int
svcsock_nonblock(int sock)
{
int flags;
if (sock < 0)
return sock;
/* This socket might be shared among multiple processes
* if mountd is run multi-threaded. So it is safest to
* make it non-blocking, else all threads might wake
* one will get the data, and the others will block
* indefinitely.
* In all cases, transaction on this socket are atomic
* (accept for TCP, packet-read and packet-write for UDP)
* so O_NONBLOCK will not confuse unprepared code causing
* it to corrupt messages.
* It generally safest to have O_NONBLOCK when doing an accept
* as if we get a RST after the SYN and before accept runs,
* we can block despite being told there was an acceptable
* connection.
*/
if ((flags = fcntl(sock, F_GETFL)) < 0)
xlog(L_ERROR, "svc_socket: can't get socket flags: %m");
else if (fcntl(sock, F_SETFL, flags|O_NONBLOCK) < 0)
xlog(L_ERROR, "svc_socket: can't set socket flags: %m");
else
return sock;
(void) __close(sock);
return -1;
}
static int
svc_socket (u_long number, int type, int protocol, int reuse)
{
struct sockaddr_in addr;
socklen_t len = sizeof (struct sockaddr_in);
int sock, ret;
const char *proto = protocol == IPPROTO_TCP ? "tcp" : "udp";
if ((sock = __socket (AF_INET, type, protocol)) < 0)
{
xlog(L_ERROR, "svc_socket: socket creation problem: %m");
return sock;
}
if (reuse)
{
ret = 1;
ret = setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, &ret,
sizeof (ret));
if (ret < 0)
{
xlog(L_ERROR, "svc_socket: socket reuse problem: %m");
(void) __close(sock);
return ret;
}
}
memset (&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(getservport(number, proto));
if (bind(sock, (struct sockaddr *) &addr, len) < 0)
{
xlog(L_ERROR, "svc_socket: bind problem: %m");
(void) __close(sock);
sock = -1;
}
return svcsock_nonblock(sock);
}
/*
* Create and bind a TCP socket based on program number
*/
int
svctcp_socket (u_long number, int reuse)
{
return svc_socket (number, SOCK_STREAM, IPPROTO_TCP, reuse);
}
/*
* Create and bind a UDP socket based on program number
*/
int
svcudp_socket (u_long number)
{
return svc_socket (number, SOCK_DGRAM, IPPROTO_UDP, FALSE);
}
#ifdef TEST
static int
check (u_long number, u_short port, int protocol, int reuse)
{
int socket;
int result;
struct sockaddr_in addr;
socklen_t len = sizeof (struct sockaddr_in);
if (protocol == IPPROTO_TCP)
socket = svctcp_socket (number, reuse);
else
socket = svcudp_socket (number);
if (socket < 0)
return 1;
result = getsockname (socket, (struct sockaddr *) &addr, &len);
if (result == 0)
{
if (port != 0 && ntohs (addr.sin_port) != port)
printf ("Program: %ld, expect port: %d, got: %d\n",
number, port, ntohs (addr.sin_port));
else
printf ("Program: %ld, port: %d\n",
number, ntohs (addr.sin_port));
}
close (socket);
return result;
}
int
main (void)
{
int result = 0;
result += check (100001, 0, IPPROTO_TCP, 0);
result += check (100001, 0, IPPROTO_UDP, 0);
result += check (100003, 2049, IPPROTO_TCP, 1);
result += check (100003, 2049, IPPROTO_UDP, 1);
return result;
}
#endif
|
