| | |
| recv() |
| send() |
| recv() |
| send() |
| recv() |
| send() |
| send() |
| recv() |
| recv() |
| send() |
| send() |
| recv() |
1 /*
2 * POP3 client program
3 * mailp.c
4 * cc mailp.c -lnsl -o mailp
5 */
6
7 #include
8 #include
9 #include
10 #include
11 #include
12 #include
13 #include
14 #include
15
16 #define BUFMAX 256
17 #define PORT_NO 110
18
19 void read_msg();
20 void print_err(char *);
21
22 extern int h_errno;
23 int net;
24 int nbyte;
25 char r_msg[BUFMAX];
26 char s_msg[BUFMAX];
27 char input[6];
28
29 int
30 main(int argc, char *argv[])
31 {
32 struct hostent *host;
33 struct servent *serv;
34 struct sockaddr_in sa;
35 char p_list[] = "LIST\n";
36 char p_user[] = "USER pop_user\n";
37 char p_pass[] = "PASS pop_password\n";
38 char p_quit[] = "QUIT\n";
39
40 if (argc != 2) {
41 printf("Usage: %s hostname\n", argv[0]);
42 exit(1);
43 }
44
45 /*
46 * Check Host name
47 */
48 if ((host = gethostbyname(argv[1])) == NULL){
49 herror("gethostbyname()");
50 close(net);
51 exit(1);
52 }
53
54 memset(&sa,0, sizeof(struct sockaddr_in));
55 memcpy(&sa.sin_addr, host->h_addr, sizeof(struct in_addr));
56
57 sa.sin_family = AF_INET;
58 sa.sin_port = htons(PORT_NO);
59
60 /*
61 * Make socket
62 */
63 if((net = socket(AF_INET, SOCK_STREAM, 0)) < 0)
64 print_err("socket()");
65
66 /*
67 * Connect to the mail server
68 */
69 if (connect(net, (struct sockaddr *)&sa, sizeof(struct sockaddr)) < 0)
70 print_err("connect()");
71
72 /*
73 * Receive connection messages from server
74 */
75 memset(r_msg,0,BUFMAX);
76 if( recv(net,r_msg,BUFMAX,0) < 0)
77 print_err("recv()");
78 printf("%s",r_msg);
79
80 /*
81 * Send user name
82 */
83 nbyte = strlen( p_user );
84 if( send(net,p_user,nbyte,0) < 0)
85 print_err("send()");
86
87 memset(r_msg,0,BUFMAX);
88 if( recv(net,r_msg,BUFMAX,0) < 0)
89 print_err("recv");
90 printf("%s",r_msg);
91
92 /*
93 * Send password
94 */
95 nbyte = strlen(p_pass);
96 if( send(net,p_pass,nbyte,0) < 0 )
97 print_err("send()");
98
99 memset(r_msg,0,BUFMAX);
100 if( recv(net,r_msg,BUFMAX,0) < 0)
101 print_err("recv()");
102 printf("%s",r_msg);
103
104 /*
105 * Request mail list & Select letter number
106 */
107 while(1){ /* loop start */
108 nbyte = strlen( p_list );
109 if( send(net,p_list,nbyte,0) < 0 )
110 print_err("send()");
111 while(1){
112 memset(r_msg,0,BUFMAX);
113 if( recv(net,r_msg,BUFMAX,0) < 0)
114 print_err("recv()");
115 printf("%s",r_msg);
116 if ( strstr( r_msg, "\n.") != NULL) {
117 printf("\n");
118 break;
119 }
120 }
121
122 /*
123 * Enter letter number
124 */
125 printf("Enter the number you want to read( q for quit)\n");
126 if ( scanf("%5s", input) < 0)
127 print_err("scanf()");
128
129 if ( input[0] == 'q' ) {
130 nbyte = strlen( p_quit );
131 if( send(net,p_quit,nbyte,0) < 0)
132 print_err("send()");
133 memset(r_msg,0,BUFMAX);
134 if( recv(net,r_msg,BUFMAX,0) < 0)
135 print_err("recv()");
136 printf("%s\n",r_msg);
137 /* Normal closure process */
138 if (shutdown(net, 2) < 0)
139 print_err("shutdown()");
140 close(net);
141 exit(0);
142 }
143 if( (isdigit(input[0])) == 0){
144 printf("Input error\n");
145 continue;
146 }
147 read_msg();
148 } /* loop end */
149 }
150
151 /*********************************************************
152 * read_msg()
153 *
154 * Retrieve and print email message from the mail server
155 *********************************************************/
156 void
157 read_msg()
158 {
159 sprintf(s_msg,"RETR %s\n",input);
160 nbyte = strlen(s_msg);
161 if( send(net,s_msg,nbyte,0) < 0 )
162 print_err("send()");
163 while(1){
164 memset(r_msg,0,BUFMAX);
165 if( recv(net,r_msg,BUFMAX,0) < 0)
166 print_err("recv()");
167 printf("%s",r_msg);
168 if( strstr(r_msg,"\n.") != NULL ){
169 printf("\n");
170 break;
171 }
172 }
173 return;
174 }
175
176 void
177 print_err(char *func)
178 {
179 perror(func);
180 close(net);
181 exit(1);
182 }
mailp.c
% ./mailp mail.example.com
+OK POP3 mail v2001.80 server ready
+OK User name accepted, password please
+OK Mailbox open, 2 messages
+OK Mailbox scan listing follows
1 392
2 395
.
Enter the number you want to read.( q for quit)
1
+OK 392 octets
Return-Path: <root><root@mail.example.com>
Received: (from root@localhost)
by mail.example.com (8.8.7/8.8.7) id AAA21525
for pop_user; Thu, 1 Jul 1999 00:24:05 +0900
Date: Thu, 1 Jul 1999 00:24:05 +0900
From: root
Message-Id: <199906301524.AAA21525@mail.example.com>
To: pop_user@mail.example.com
Subject: test1
X-UIDL: 0beb13dbeab34ae6e3549b3f5ea2872c
Status: RO
This is a test mail from root.
Can you read?
.
+OK 2 messages (787 octets)
1 392
2 395
.
Enter the number you want to read( q for quit)
q
+OK Sayonara
40 if (argc != 2) {
41 printf("Usage: %s hostname\n", argv[0]);
42 exit(1);
43 }
48 if ((host = gethostbyname(argv[1])) == NULL){
49 herror("gethostbyname()");
50 close(net);
51 exit(1);
52 }
| gethostbyname() |
| |
| #include <netdb.h> |
| struct hostent *gethostbyname(const char *name); |
| |
|
|
54 memset(&sa,0, sizeof(struct sockaddr_in));
80 /*
81 * Send user name
82 */
83 nbyte = strlen( p_user );
84 if( send(net,p_user,nbyte,0) < 0)
85 print_err("send()");
86
87 memset(r_msg,0,BUFMAX);
88 if( recv(net,r_msg,BUFMAX,0) < 0)
89 print_err("recv");
90 printf("%s",r_msg);
| send() |
| |
| #include <sys/types.h>
#include <sys/socket.h> |
| int send(int s, const void *msg, int len, unsigned int flags); |
|
|
|
|
| recv() |
| |
| #include <sys/types.h>
#include <sys/socket.h> |
| int recv(int s, void *msg, int len, unsigned int flags); |
|
|
|
|
104 /*
105 * Request mail list & Select letter number
106 */
107 while(1){ /* loop start */
108 nbyte = strlen( p_list );
109 if( send(net,p_list,nbyte,0) < 0 )
110 print_err("send()");
111 while(1){
112 memset(r_msg,0,BUFMAX);
113 if( recv(net,r_msg,BUFMAX,0) < 0)
114 print_err("recv()");
115 printf("%s",r_msg);
116 if ( strstr( r_msg, "\n.") != NULL) {
117 printf("\n");
118 break;
119 }
120 }
122 /*
123 * Enter letter number
124 */
125 printf("Enter the number you want to read( q for quit)\n");
126 if ( scanf("%5s", input) < 0)
127 print_err("scanf()");
128
129 if ( input[0] == 'q' ) {
130 nbyte = strlen( p_quit );
131 if( send(net,p_quit,nbyte,0) < 0)
132 print_err("send()");
133 memset(r_msg,0,BUFMAX);
134 if( recv(net,r_msg,BUFMAX,0) < 0)
135 print_err("recv()");
136 printf("%s\n",r_msg);
137 /* Normal closure process */
138 if (shutdown(net, 2) < 0)
139 print_err("shutdown()");
140 close(net);
141 exit(0);
142 }
143 if( (isdigit(input[0])) == 0){
144 printf("Input error\n");
145 continue;
146 }
143 if( (isdigit(input[0])) == 0){
144 printf("Input error\n");
145 continue;
146 }
147 read_msg();
156 void
157 read_msg()
158 {
159 sprintf(s_msg,"RETR %s\n",input);
160 nbyte = strlen(s_msg);
161 if( send(net,s_msg,nbyte,0) < 0 )
162 print_err("send()");
163 while(1){
164 memset(r_msg,0,BUFMAX);
165 if( recv(net,r_msg,BUFMAX,0) < 0)
166 print_err("recv()");
167 printf("%s",r_msg);
168 if( strstr(r_msg,"\n.") != NULL ){
169 printf("\n");
170 break;
171 }
172 }
173 return;
174 }
