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
|
/* Copyright 1993-95 by Carl Harris, Jr. Copyright 1996 by Eric S. Raymond
* All rights reserved.
* For license terms, see the file COPYING in this directory.
*/
/***********************************************************************
module: socket.c
project: popclient
programmer: Carl Harris, ceharris@mal.com
description: socket library functions
***********************************************************************/
#include <config.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/time.h>
#if defined(STDC_HEADERS)
#include <string.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <stdlib.h>
#include <varargs.h>
#include "bzero.h"
#include "socket.h"
/* Size of buffer for internal buffering read function
don't increase beyond the maximum atomic read/write size for
your sockets, or you'll take a potentially huge performance hit */
#define INTERNAL_BUFSIZE 2048
int Socket(host, clientPort)
char *host;
int clientPort;
{
int sock;
unsigned long inaddr;
struct sockaddr_in ad;
struct hostent *hp;
memset(&ad, 0, sizeof(ad));
ad.sin_family = AF_INET;
inaddr = inet_addr(host);
if (inaddr != INADDR_NONE)
memcpy(&ad.sin_addr, &inaddr, sizeof(inaddr));
else
{
hp = gethostbyname(host);
if (hp == NULL)
return -1;
memcpy(&ad.sin_addr, hp->h_addr, hp->h_length);
}
ad.sin_port = htons(clientPort);
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
return sock;
if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
return -1;
return sock;
}
int SockGets(socket,buf,len)
int socket;
char *buf;
int len;
{
while (--len)
{
if (SockInternalRead(socket, buf, 1) != 1)
return -1;
if (*buf == '\n')
break;
if (*buf != '\r') /* remove all CRs */
buf++;
}
*buf = 0;
return 0;
}
int SockPuts(socket,buf)
int socket;
char *buf;
{
int rc;
if (rc = SockWrite(socket, buf, strlen(buf)))
return rc;
return SockWrite(socket, "\r\n", 2);
}
int SockWrite(socket,buf,len)
int socket;
char *buf;
int len;
{
int n;
while (len)
{
n = write(socket, buf, len);
if (n <= 0)
return -1;
len -= n;
buf += n;
}
return 0;
}
int SockRead(socket,buf,len)
int socket;
char *buf;
int len;
{
int n;
while (len)
{
n = SockInternalRead(socket, buf, len);
if (n <= 0)
return -1;
len -= n;
buf += n;
}
return 0;
}
int SockInternalRead (socket,buf,len)
int socket;
char *buf;
int len;
{
static int sbuflen = 0;
static char sbuf [INTERNAL_BUFSIZE];
static char *bp;
if (sbuflen == 0) {
/* buffer is empty; refresh. */
if ((sbuflen = read(socket,sbuf,INTERNAL_BUFSIZE)) < 0) {
perror("SockInternalRead: read");
exit(9);
}
else
bp = sbuf;
}
else
; /* already some data in the buffer */
/* can't get more than we have right now. */
/* XXX -- should probably try to load any unused part of sbuf
so that as much of 'len' as possible can be satisfied */
if (len > sbuflen)
len = sbuflen;
else
; /* wants no more than we already have */
/* transfer to caller's buffer */
if (len == 1) {
/* special case: if caller only wants one character, it probably
costs a lot more to call bcopy than to do it ourselves. */
*buf = *(bp++);
sbuflen--;
}
else {
bcopy(bp,buf,len);
sbuflen -= len;
bp += len;
}
return(len);
}
int SockPrintf(socket,format,va_alist)
int socket;
char *format;
va_dcl {
va_list ap;
char buf[8192];
va_start(ap);
vsprintf(buf, format, ap);
va_end(ap);
return SockWrite(socket, buf, strlen(buf));
}
|
