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
|
/*
* smtp.c -- code for speaking SMTP to a listener port
*
* Concept due to Harry Hochheiser. Implementation by ESR. Cleanup and
* strict RFC821 compliance by Cameron MacPherson.
*
* Copyright 1996 Eric S. Raymond
* All rights reserved.
* For license terms, see the file COPYING in this directory.
*/
#include <stdio.h>
#include <config.h>
#include <unistd.h>
#include <string.h>
#include "fetchmail.h"
#include "socket.h"
#include "smtp.h"
struct opt
{
char *name;
int value;
};
static struct opt extensions[] =
{
{"8BITMIME", ESMTP_8BITMIME},
{"SIZE", ESMTP_SIZE},
{"ETRN", ESMTP_ETRN},
{(char *)NULL, 0},
};
char smtp_response[MSGBUFSIZE];
int SMTP_helo(int sock,char *host)
/* send a "HELO" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"HELO %s\r\n", host);
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> HELO %s", host);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_ehlo(int sock, char *host, int *opt)
/* send a "EHLO" message to the SMTP listener, return extension status bits */
{
int ok;
struct opt *hp;
SockPrintf(sock,"EHLO %s\r\n", host);
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> EHLO %s", host);
*opt = 0;
while ((SockRead(sock, smtp_response, sizeof(smtp_response)-1)) != -1)
{
int n = strlen(smtp_response);
if (smtp_response[strlen(smtp_response)-1] == '\n')
smtp_response[strlen(smtp_response)-1] = '\0';
if (smtp_response[strlen(smtp_response)-1] == '\r')
smtp_response[strlen(smtp_response)-1] = '\r';
if (n < 4)
return SM_ERROR;
smtp_response[n] = '\0';
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP< %s", smtp_response);
for (hp = extensions; hp->name; hp++)
if (!strncasecmp(hp->name, smtp_response+4, strlen(hp->name)))
*opt |= hp->value;
if ((smtp_response[0] == '1' || smtp_response[0] == '2' || smtp_response[0] == '3') && smtp_response[3] == ' ')
return SM_OK;
else if (smtp_response[3] != '-')
return SM_ERROR;
}
return SM_UNRECOVERABLE;
}
int SMTP_from(int sock, char *from, char *opts)
/* send a "MAIL FROM:" message to the SMTP listener */
{
int ok;
struct opt *hp;
char buf[MSGBUFSIZE];
sprintf(buf, "MAIL FROM:<%s>", from);
if (opts)
strcat(buf, opts);
SockPrintf(sock,"%s\r\n", buf);
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> %s", buf);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_rcpt(int sock, char *to)
/* send a "RCPT TO:" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"RCPT TO:<%s>\r\n", to);
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> RCPT TO:<%s>", to);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_data(int sock)
/* send a "DATA" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"DATA\r\n");
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> DATA");
ok = SMTP_ok(sock);
return ok;
}
int SMTP_rset(int sock)
/* send a "RSET" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"RSET\r\n");
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> RSET");
ok = SMTP_ok(sock);
return ok;
}
int SMTP_quit(int sock)
/* send a "QUIT" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"QUIT\r\n");
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> QUIT");
ok = SMTP_ok(sock);
return ok;
}
int SMTP_eom(int sock)
/* send a message data terminator to the SMTP listener */
{
int ok;
SockPrintf(sock,".\r\n");
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP>. (EOM)");
ok = SMTP_ok(sock);
return ok;
}
int SMTP_ok(int sock)
/* returns status of SMTP connection */
{
while ((SockRead(sock, smtp_response, sizeof(smtp_response)-1)) != -1)
{
int n = strlen(smtp_response);
if (smtp_response[strlen(smtp_response)-1] == '\n')
smtp_response[strlen(smtp_response)-1] = '\0';
if (smtp_response[strlen(smtp_response)-1] == '\r')
smtp_response[strlen(smtp_response)-1] = '\r';
if (n < 4)
return SM_ERROR;
smtp_response[n] = '\0';
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP< %s", smtp_response);
if ((smtp_response[0] == '1' || smtp_response[0] == '2' || smtp_response[0] == '3') && smtp_response[3] == ' ')
return SM_OK;
else if (smtp_response[3] != '-')
return SM_ERROR;
}
return SM_UNRECOVERABLE;
}
/* smtp.c ends here */
|
