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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/* 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: pop3.c
project: fetchmail
programmer: Carl Harris, ceharris@mal.com
Hacks and bug fixes by esr.
description: POP3 client code.
***********************************************************************/
#include <config.h>
#include <stdio.h>
#include "socket.h"
#include "fetchmail.h"
static int last;
int pop3_ok (socket, argbuf)
/* parse command response */
int socket;
char *argbuf;
{
int ok;
char buf [POPBUFSIZE+1];
char *bufp;
if (SockGets(socket, buf, sizeof(buf)) >= 0) {
if (outlevel == O_VERBOSE)
fprintf(stderr,"%s\n",buf);
bufp = buf;
if (*bufp == '+' || *bufp == '-')
bufp++;
else
return(PS_PROTOCOL);
while (isalpha(*bufp))
bufp++;
*(bufp++) = '\0';
if (strcmp(buf,"+OK") == 0)
ok = 0;
else if (strcmp(buf,"-ERR") == 0)
ok = PS_ERROR;
else
ok = PS_PROTOCOL;
if (argbuf != NULL)
strcpy(argbuf,bufp);
}
else
ok = PS_SOCKET;
return(ok);
}
int pop3_getauth(socket, queryctl, greeting)
/* apply for connection authorization */
int socket;
struct hostrec *queryctl;
char *greeting;
{
char buf [POPBUFSIZE+1];
/* build MD5 digest from greeting timestamp + password */
if (queryctl->protocol == P_APOP)
{
char *start,*end;
char *msg;
/* find start of timestamp */
for (start = greeting; *start != 0 && *start != '<'; start++)
continue;
if (*start == 0) {
fprintf(stderr,"Required APOP timestamp not found in greeting\n");
return(PS_AUTHFAIL);
}
/* find end of timestamp */
for (end = start; *end != 0 && *end != '>'; end++)
continue;
if (*end == 0 || (end - start - 1) == 1) {
fprintf(stderr,"Timestamp syntax error in greeting\n");
return(PS_AUTHFAIL);
}
/* copy timestamp and password into digestion buffer */
msg = (char *) malloc((end-start-1) + strlen(queryctl->password) + 1);
*(++end) = 0;
strcpy(msg,start);
strcat(msg,queryctl->password);
strcpy(queryctl->digest, MD5Digest(msg));
free(msg);
}
switch (queryctl->protocol) {
case P_POP3:
gen_send(socket,"USER %s", queryctl->remotename);
if (pop3_ok(socket, buf) != 0)
goto badAuth;
gen_send(socket, "PASS %s", queryctl->password);
if (pop3_ok(socket, buf) != 0)
goto badAuth;
break;
case P_RPOP:
gen_send(socket,"USER %s", queryctl->remotename);
if (pop3_ok(socket, buf) != 0)
goto badAuth;
gen_send(socket, "RPOP %s", queryctl->password);
if (pop3_ok(socket, buf) != 0)
goto badAuth;
break;
case P_APOP:
gen_send(socket,"APOP %s %s", queryctl->remotename, queryctl->digest);
if (pop3_ok(socket, buf) != 0)
goto badAuth;
break;
default:
fprintf(stderr,"Undefined protocol request in POP3_auth\n");
}
/* we're approved */
return(0);
/*NOTREACHED*/
badAuth:
if (outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"%s\n",buf);
return(PS_ERROR);
}
static pop3_getrange(socket, queryctl, countp)
/* get range of messages to be fetched */
int socket;
struct hostrec *queryctl;
int *countp;
{
int ok;
char buf [POPBUFSIZE+1];
/* get the total message count */
gen_send(socket, "STAT");
ok = pop3_ok(socket, buf);
if (ok == 0)
sscanf(buf,"%d %*d", countp);
else
return(ok);
/*
* Newer, RFC-1725-conformant POP servers may not have the LAST command.
*/
last = 0;
if (*countp > 0 && !queryctl->fetchall)
{
char id [IDLEN+1];
gen_send(socket,"LAST");
ok = pop3_ok(socket, buf);
if (ok == 0 && sscanf(buf, "%d", &last) == 0)
return(PS_ERROR);
}
return(0);
}
static int pop3_is_old(socket, queryctl, num)
int socket;
struct hostrec *queryctl;
int num;
{
return (num <= last);
}
static int pop3_fetch(socket, number, lenp)
/* request nth message */
int socket;
int number;
int *lenp;
{
*lenp = 0;
return(gen_transact(socket, "RETR %d", number));
}
static pop3_delete(socket, queryctl, number)
/* delete a given message */
int socket;
struct hostrec *queryctl;
int number;
{
int ok;
/* send the deletion request */
if ((ok = gen_transact(socket, "DELE %d", number)) != 0)
return(ok);
}
const static struct method pop3 =
{
"POP3", /* Post Office Protocol v3 */
110, /* standard POP3 port */
0, /* this is not a tagged protocol */
1, /* this uses a message delimiter */
pop3_ok, /* parse command response */
pop3_getauth, /* get authorization */
pop3_getrange, /* query range of messages */
pop3_is_old, /* how do we tell a message is old? */
pop3_fetch, /* request given message */
NULL, /* no message trailer */
pop3_delete, /* how to delete a message */
NULL, /* no POP3 expunge command */
"QUIT", /* the POP3 exit command */
};
int doPOP3 (queryctl)
/* retrieve messages using POP3 */
struct hostrec *queryctl;
{
if (queryctl->remotefolder[0]) {
fprintf(stderr,"Option --remote is not supported with POP3\n");
return(PS_SYNTAX);
}
return(do_protocol(queryctl, &pop3));
}
|
