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Implementation of POP3 client code
2022-07-24 02:21:00 【ZhuMou】
This is the course of this semester The big homework of Internet Application , Done by one alone . Specific resources can be downloaded for free on my homepage , I think so . I remember I set it as free .
Requirements are as follows ：
More specifically, you should see my design report , You can't upload it here . Just looking at the following code is not very good to understand .
Just download it from the resources , Free of charge . It's not free to kick me , I'll change it . Yes bug Kick me .
Please pay attention to copying code ： Some of my notes are in Chinese , Be careful not to pass the compiler . Then I C The language is C99 Of , Environment is wubantu .
1 makefile be used for Linux compile
main.exe:main.out tcp.out logon.out choose.out stat.out list.out retr.out encode.out readLine.out dele.out search.out
gcc main.out tcp.out logon.out choose.out stat.out list.out retr.out encode.out readLine.out dele.out search.out -o main.exe
main.out:main.c
gcc -c main.c -o main.out
tcp.out:tcp.c
gcc -c tcp.c -o tcp.out
logon.out:logon.c
gcc -c logon.c -o logon.out
choose.out:choose.c
gcc -c choose.c -o choose.out
stat.out:stat.c
gcc -c stat.c -o stat.out
list.out:list.c
gcc -c list.c -o list.out
retr.out:retr.c
gcc -c retr.c -o retr.out
encode.out:encode.c
gcc -c encode.c -o encode.out
readLine.out:readLine.c
gcc -c readLine.c -o readLine.out
dele.out:dele.c
gcc -c dele.c -o dele.out
search.out:search.c
gcc -c search.c -o search.out
2 choose() POP3 Client function selection
#ifndef _CHOOSE_H_
#define _CHOOSE_H_
int choose();
#endif
#include <unistd.h>
#include <stdio.h>
#include "choose.h"
int choose(){
int choice = 0;
puts("-----Here is the main menu!-----");
puts("UA offers these functions for you:");
puts("1.check the state of the mailbox");
puts("2.list all the mails in the mailbox");
puts("3.display the content of a mail");
puts("4.delete a main from the mailbox");
puts("5.keyword search in local mails");
puts("6.display the subjects of local mails");
puts("7.quit anyway");
puts("------End of the main menu------");
int rec = 0;
char buf[BUFSIZ];
do{
puts("Your choice: ");
while(rec == 0){
rec = read(STDIN_FILENO,buf,sizeof(buf));
}
if(rec > 2){
puts("Error: too long input!");
rec = 0;
continue;
}
if(buf[0] < '1' || buf[0] > '7'){
rec = 0;
puts("Error: beyond 1-7!");
continue;
}
break;
}while(1 == 1);
choice = buf[0] - '0';
return choice;
}
3 dele() Delete mail
#ifndef _DELE_H_
#define _DELE_H_
void dele(int cfd);
#endif
#include "dele.h"
#include <unistd.h>
#include <stdio.h>
#include <string.h>
void dele(int cfd){
int rec = 0;
char dele[20] = {'D','E','L','E',' ','\0'};
puts("----DELE----");
char buf[BUFSIZ];
// Give users a whole inquiry function , So as not to delete by mistake
char num[10];// Used to store the serial number to be deleted
char a;
int i = 0;
while((a = getchar())!='\n'){
num[i] = a;
++i;
}
num[i] = '\n'; num[i+1] = '\0';
strcat(dele,num);
// Here is a confirmation
puts("Are you SURE you want DELETE an email?");
printf("You command: %s",dele);
puts("Enter y/Y to confirm and others to CANCEL!");
printf("You FINAL choice:");
a = getchar();
char b;//b It is used to empty the buffer
while((b=getchar())!='\n'){
}
if(a=='y' || a=='Y'){
;//do nothing
}else return;
write(cfd,dele,strlen(dele));
readLine(cfd,buf,sizeof(buf));
if(buf[0]=='-' && buf[1]=='E' && buf[2]=='R'){
system("clear");
puts("From MTA: invalid command!");
puts("From MTA: or you may not have so many mails!");
return;
}
puts("You have delete one mail!");
}
4 encode() be used for base64 decode , It was originally named decode Of , The name was wrong , Has been used
#ifndef _ENCODE_H_
#define _ENCODE_H_
void encode(char* buf,char*);
#endif
#include "encode.h"
#include <stdio.h>
//encode for very four BASE64 codes
void toBinary(int num,int* binary){
int i = 0;
int j = 0;
if(num == -1){// Deal with what the equal sign brings -1 The situation of , At this time, we need all -1
for(j=0;j<6;++j){
binary[j] = 0;
}
return;
}
while(num !=0){
binary[i] = num%2;
++i;
num = num / 2;
}
return;
}
void encode(char* password,char* result){
//password It's known to be four , such as dasf\0, Split and remove \n The function of needs to be solved externally
//result Three digits ascii character , For the result of decoding . If dad\0
const char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int bit0[6] = {0};//password[0] The binary representation of
int bit1[6] = {0};//password[1] The binary representation of
int bit2[6] = {0};//password[2] The binary representation of
int bit3[6] = {0};//password[3] The binary representation of
int count = 0;//= The number of
int bit[25];
// hold base64 The code text becomes based on table The number of represents , Store in num in
int num[4];
int i = 0; int j = 0;int k = 0;
for(i=0;i<4;++i){
for(j=0;j<64;++j){
if(password[i]==table[j]){// For every one password The codeword of is found in table Position in
// Record location
num[i] = j;
break;// Saving time
}
if(password[i]=='='){
num[i] = -1;// about =, We turn it into -1 To differentiate
}
}
}
//test for password to num Three inputs :addd ad== add=
/*printf("%c = %d\n",password[0],num[0]);
printf("%c = %d\n",password[1],num[1]);
printf("%c = %d\n",password[2],num[2]);
printf("%c = %d\n",password[3],num[3]);
*/
// hold num The number in becomes the corresponding binary form , Put in bit0,1,2,3 in
toBinary(num[0],bit0);
toBinary(num[1],bit1);
toBinary(num[2],bit2);
toBinary(num[3],bit3);
//test for the all above codes Three inputs :addd ad== add=
/* for(int i =0;i<6;++i){
printf("%d\n",bit0[i]);
}
for(int i =0;i<6;++i){
printf("%d\n",bit1[i]);
}
for(int i =0;i<6;++i){
printf("%d\n",bit2[i]);
}
for(int i =0;i<6;++i){
printf("%d\n",bit3[i]);
}*/
// At this time, we need to find out how many = In order to determine how much to subtract at the end 0. Subtract from each equal sign 8 individual 0.
for(k=0;k<4;++k){
if(num[k]==-1) ++count;
}
//test for count = Three inputs :addd ad== add=
/* printf("count = %d\n",count);*/
int charnum = 3 - count;// Calculate what can be converted ascii The number of characters
int pow2[6] = {1,2,4,8,16,32};
int ascii0 = 0;
int ascii1 = 0;
int ascii2 = 0;
int temp1 = 0;
int temp2 = 0;
int temp3 = 0;
//ascii0 Need that bit0 All and bit1 Two high positions of , Don't forget to deal with it
for(k=0;k<6;++k){
ascii0 = ascii0 + bit0[k] * pow2[k];
}
ascii0 = ascii0 * 4;
for(k=4;k<6;++k){
temp1 = temp1 + bit1[k] * pow2[k];
}
temp1 = temp1/16;
ascii0 += temp1;
// printf("ascii0 = %d\n",ascii0);
//ascii1 need bit1 And bit2 Four high positions of
if(charnum >= 2){
for(k=0;k<4;k++){
ascii1 = ascii1 + bit1[k]*pow2[k];
}
ascii1 = 16 * ascii1;
for(k=2;k<6;++k){
temp2 = temp2 + bit2[k]*pow2[k];
}
temp2 = temp2/4;
ascii1 += temp2;
// printf("ascii1 = %d\n",ascii1);
}
//ascii need bit2 And bit3 All
if(charnum >= 3){
for(k=0;k<2;k++){
ascii2 = ascii2 + bit2[k]*pow2[k];
}
ascii2 = 64 * ascii2;
for(k=0;k<6;++k){
temp3 = temp3 + bit3[k]*pow2[k];
}
ascii2 = ascii2 + temp3;
// printf("ascii2 = %d\n",ascii2);
}
if(charnum==1){
result[0] = ascii0;
result[1] = '\0';
}
if(charnum==2){
result[0] = ascii0;
result[1] = ascii1;
result[2] = '\0';
}
if(charnum==3){
result[0] = ascii0;
result[1] = ascii1;
result[2] = ascii2;
result[3] = '\0';
}
return;
}
5 list() Used to view mailbox status
#ifndef _LIST_H_
#define _LIST_H_
void list();
#endif
#include <stdio.h>
#include "list.h"
#include <unistd.h>
void list(int cfd){
int rec = 0;
puts("----LIST----");
char buf[BUFSIZ];
write(cfd,"LIST\n",5);
while(1){
rec = readLine(cfd,buf,sizeof(buf));
if(buf[0]=='.' && buf[1]==13 && buf[2]==10){
puts("From UA: end of list");
break;
}
printf("From MTA: %s",buf);
}
}
6 logon() For user login
#ifndef _LOGON_H_
#define _LOGON_H_
int logon(int cfd);
#endif
#include <stdio.h>
#include <ctype.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "logon.h"
int logon(int cfd){
int rec1 = 0;
int rec2 = 0;
int returnValue = 0;
char buf1[BUFSIZ];
char buf2[BUFSIZ];
char buf3[BUFSIZ];
char buf4[BUFSIZ];
char buf5[BUFSIZ];
char pass[] = "PASS "; char* commands;
char user[] = "USER "; char* command;
char a,b;
puts("------LOG IN------");
puts("Your username: ");
//ask for use
int i = 0;
while((a = getchar()) != '\n'){
buf2[i] = a;
++i;
}
buf2[i] = '\n'; buf2[i+1] = '\0';
command = strcat(user,buf2);
printf("YOUR COMMAND = %s",command);
write(cfd,command,strlen(command));
rec1 = read(cfd,buf3,sizeof(buf3));
printf("From MTA: %s",buf3);
//ask for password
puts("Your password: ");
//ask for pass
int j = 0;
while((b = getchar())!='\n'){
buf4[j] = b;
++j;
}
buf4[j] = '\n'; buf4[j+1] = '\0';
commands = strcat(pass,buf4);
printf("YOUR COMMANDS = %s",commands);
write(cfd,commands,strlen(commands));
rec1 = read(cfd,buf5,sizeof(buf5));
printf("From MTA: %s",buf5);
// If it is +OK Words , It indicates that the login is successful ; Otherwise failure
if(buf5[0]=='+'&&buf5[1]=='O'){
returnValue = 1;
}else returnValue = -1;
return returnValue;
}
7 main() The main function
#include "tcp.h"
#include "logon.h"
#include <stdio.h>
#include <stdlib.h>
#include "choose.h"
#include "stat.h"
#include "list.h"
#include "retr.h"
#include "encode.h"
#include "readLine.h"
#include "dele.h"
#include "search.h"
#include "main.h"
#define SER_PORT 110
int main(){
// First try to establish tcp Connect
system("clear");
const char ser_ip[] = "123.126.96.209";
int cfd = tcp(SER_PORT,ser_ip);
int result = 0;
system("clear");
while((result = logon(cfd)) == -1){
puts("------please try again------\n");
}
system("clear");
// As long as the connection and login succeed, it doesn't matter
int flag = 0;
int i = 0;
char a;
char buf[BUFSIZ];
char keyword[20];
do{
// system("clear");
int choice = choose();
printf("Your choice is %d\n",choice);
switch(choice){
case 1: stat(cfd); break;
case 2: list(cfd); break;
case 3: retr(cfd); break;
case 4: dele(cfd); break;
case 6: search(buf,"./EMAIL/",1); break;
case 5:
puts("Enter the keyword you want to search:");
while((a=getchar())!='\n'){
keyword[i] = a;
++i;
}
keyword[i] = '\0';
search(keyword,"./EMAIL/",2);
i = 0;
break;
case 7: close(cfd);puts("-----Good bye-----");exit(0); break;
}
}while(1);
return 0;
}
8 readLine() Used to read a row from the specified socket （ With \n ending ）
#ifndef _READLINE_H_
#define _READLINE_H_
int readLine(int fd,char* buf,int size);
#endif
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "readLine.h"
int readLine(int fd,char* buf,int size){
char buf1[10];
int rec = 0;
int i = 0;
while((rec = read(fd,buf1,1)) > 0){
*(buf + i) = buf1[0];
i++;
if(buf1[0] == '\n') break;// Handle blocking
}
*(buf + i) = '\0';// Finally, add \n
return strlen(buf);
}
9 retr() Used to view the specific contents of the mailbox , And you can choose whether to download the email locally （ Ubantu system ）
#ifndef _RETR_H_
#define _RETR_H_
void retr(int cfd);
#endif
#include <stdio.h>
#include "retr.h"
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include "encode.h"
#include "readLine.h"
int judge(char* buf,int size);
void retr(int cfd){
int rec = 0;
char buf1[10];// Used to form commands
char buf[BUFSIZ];
char retu[] = "RETR ";// Used to form commands
char a;// Used to read keyboard buffer
char* buf2;// Later, it is used to read the mail content
// Clean buffer , The keyboard buffer is empty
puts("----RETR----");
puts("Enter the sequence ID: ");
int i = 0;
while((a = getchar()) != '\n'){
buf1[i] = a;
++i;
// Until you read something from the keyboard
}
buf1[i] = '\n'; buf1[i+1] = '\0';
strcat(retu,buf1);
write(cfd,retu,strlen(retu));
/* char buf_en[] = "QQ==";
char result[3];
encode(buf_en,result);
printf("result of encode = %s\n",result);*/
printf("Your command is %s",retu);
// Print the content , The key is how to read the contents of the buffer , Especially if the number of mail bytes is too large
// When the printing is finished, the whole fault-tolerant
// Use read(cfd,buf,1); It can read a single character . We read one line at a time , Until I read .\n
int j = 0;
int k = 0;
int length = 0;
int flag = -1;// Whether the previous item meets the conditions
char buf_4[] = "1234";
char buf_en[] = "123";
int html_plain = 0;
FILE* file;
file = fopen("./EMAIL/copyused","w");// Must be in override mode !
while(1){
++j;
readLine(cfd,buf,BUFSIZ);
// Fault tolerance
if(j == 1){
if(buf[0] == '-' && buf[1] == 'E'&& buf[2] == 'R'){
system("clear");
puts("From MTA: invalid command!");
puts("From MTA: or you may not have so many mails!");
fclose(file);
return;
}
}
// Handle blocking , Avoid blocking and affecting the user experience
if(buf[0] == '.' && buf[1] == '\r' && buf[2] == '\n'){
printf("\n%s",buf);
fprintf(file,"\n%s",buf);
break;
}
// Keep what users need header
if(judge(buf,BUFSIZ) == 1){
printf("\r%s",buf);
fprintf(file,"\r%s",buf);
continue;
}
if(judge(buf,BUFSIZ) == 0){
flag = -1*flag;
continue;
}
if(judge(buf,BUFSIZ) == 4){
++html_plain;
}
if(flag == 1 && judge(buf,BUFSIZ)!=2 && html_plain%2==0){// Here is the text , need encodei
// Need to put buff Constantly split into 4 A group of characters
// Because every line is 4 Multiple , So there is no need to remember
length = strlen(buf) - 2;//buf remove \n\r Number of outer characters
for(k=0;;++k){
if(4*k >= length) break;
buf_4[0] = buf[4*k]; buf_4[1] = buf[4*k+1];
buf_4[2] = buf[4*k+2]; buf_4[3] = buf[4*k+3]; buf_4[4] = '\0';
encode(buf_4,buf_en);
//oneline That's ok buf whole strcat(buf,oneline) decode(buf)
//readLine(socket,oneline)
buf_en[3] = '\0';
printf("%s",buf_en);
fprintf(file,"%s",buf_en);
}
continue;
}
}
fclose(file);
puts("\nFrom UA: Mail End");
puts("Do you want to save this mail in your PC?");
puts("Y/y for yes");
char linuxcommand[300] = "cp ./EMAIL/copyused ";
char filename[255] = "./EMAIL/";
char suffix[] = ".eml";
char q;char p;int r = 8;
p = getchar();// I only look at the first character as long as the first character is y/Y that will do
while((q=getchar())!='\n'){
// Empty buffer
}
if(p =='y' || p == 'Y'){
puts("Your email named as:");
while((q=getchar())!='\n'){
filename[r] = q;
++r;
}
filename[r] = '\0';
strcat(filename,suffix);
strcat(linuxcommand,filename);
}
return;
}
// Determine whether you need to type this string , We just need the email itself , Others don't need
//1 representative header part ,-1 Represent other control information that users definitely don't want to see ,0 representative blank line( Carriage return and line feed ),2 The representative begins with This Of
int judge(char* buf,int size){
int type = -1;
//from part
if(buf[0]=='F'&&buf[1]=='r'&&buf[2]=='o'&&buf[3]=='m')
type = 1;
if(buf[0]=='T'&&buf[1]=='o'&&buf[2]==':')
type = 1;
if(buf[0]=='S'&&buf[1]=='u'&&buf[2]=='b'&buf[3]=='j'&&buf[4]=='e'&&buf[5]=='c'&&buf[6]=='t')
type = 1;
if(buf[0]=='D'&&buf[1]=='a'&&buf[2]=='t'&&buf[3]=='e')
type = 1;
if(buf[0]=='C'&&buf[1]=='c')
type = 1;
if(buf[0]=='T'&&buf[1]=='h'&&buf[2]=='i'&&buf[3]=='s')
type = 2;
// How to judge the blank line is a problem
// hypothesis header And content Between the blank line Only line breaks \n
if(buf[0] == 13 && buf[1]==10)//
type = 0;
if(buf[0] == '-' && buf[1]=='-')
type = 3;
if(buf[0]=='C'&&buf[1]=='o'&&buf[2]=='n'&buf[3]=='t'&&buf[4]=='e'&&buf[5]=='n'&&buf[6]=='t'&&buf[7]=='-'&&buf[8]=='T'&&buf[9]=='y')
type = 4;
return type;
}
10 search() Search the subject or keyword of local mail
#ifndef _SEARCH_H_
#define _SEARCH_H_
void search(char* keyword,char* directory,int type);
#endif
#include <dirent.h>
#include <stdio.h>
#include <string.h>
void search(char* keyword,char* directory,int type){//type = 1 Indicates topic retrieval ,type = 2 Indicates keyword search
// Need to dynamically maintain a emltable
char* emltable[100];// Too lazy to engage in dynamic allocation , Just static allocation
char* temp;// For temporary storage of file names
DIR* dirptr = NULL;// Pointer to folder
struct dirent *entry;// Information about storing documents
if((dirptr = opendir(directory))==NULL){
puts("From UA: fail to open Directory MAIL!");
return;
}
int num = 0;// Storage file The number of
int length = 0;// Temporary storage string length
while((entry=readdir(dirptr))){
// printf("%s",entry->d_name);// Including the current directory and the upper level directory
// as long as endwith .eml The file of , Unwanted copyused,. and ..
temp = entry->d_name;
length = strlen(temp);
if(temp[length-1]=='l'&&temp[length-2]=='m'&&temp[length-3]=='e'&&temp[length-4]=='.'){
emltable[num] = temp;
++num;
}
}
// The above code successfully put the file names of all the files in the folder emltable In this watch ,num Express eml Number of documents
FILE* file;// Here is the emltable It's OK to complete all the elements in
int i = 0;int j =0;int k = 0;
//type = 1 Topic retrieval
char filename[100];
strcpy(filename,directory);
char oneline[1000] = "123";
int length2 = 0;
int num_k = 0;
int length_k = strlen(keyword);
for(i=0;i<num;++i){
file = fopen(strcat(filename,emltable[i]),"r");
// Here is the retrieval operation
// Topics can be retrieved line by line
if(type == 1){
while(1){
freadLine(file,oneline,BUFSIZ);
if(oneline[0]=='.' && oneline[1]=='\r' & oneline[2] == '\n'){
break;
}
if(type == 1){
if(oneline[0]=='\r' && oneline[1] == 'S' && oneline[2] == 'u'){
printf("From %s:\n",emltable[i]);
printf("%s",oneline);
}
}
}
}
if(type == 2){
while(1){
freadLine(file,oneline,BUFSIZ);
if(oneline[0]=='.' && oneline[1]=='\r' && oneline[2] == '\n')
break;
// How to search keywords in a row
for(j=0;j<strlen(oneline);++j){
if(keyword[0]==oneline[j]){
for(k=0;k<strlen(keyword);++k){
if(k+j > strlen(oneline)-1) break;
if(keyword[k]==oneline[k+j]){
;
} else break;
}//end of k for
// if(k==strlen(keyword)-1) puts("FOUND");
if(k==strlen(keyword)){
++num_k;
// printf("%s has %s\n",emltable[i],keyword);
}
}//end of outer if
}
}
}
if(num_k > 0)
printf("%s has %d %s\n",emltable[i],num_k,keyword);
// printf("%s",oneline);
num_k = 0;
fclose(file);
strcpy(filename,directory);
}
return;
}
// Need one freadLine function
int freadLine(FILE* file,char* buf,int size){
char a = 0;
int i = 0;
while((a = fgetc(file)) > 0){
*(buf + i) = a;
++i;
if(a == '\n') break;
}
*(buf + i) = '\0';
return strlen(buf);
}
11 stat() Used to view mailbox status
#ifndef _STAT_H_
#define _STAT_H_
void stat(int cfd);
#endif
#include <stdio.h>
#include "stat.h"
#include <unistd.h>
void stat(int cfd){
int rec = 0;
puts("----STAT----");
char buf[BUFSIZ];
write(cfd,"STAT\n",5);
rec = readLine(cfd,buf,sizeof(buf));
printf("From MTA: %s",buf);
puts("From UA: end of stat");
}
12 For building tcp Connect
#ifndef _TCP_H_
#define _TCP_H_
int tcp(short port,const char* ip);
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "tcp.h"
#include <stdlib.h>
#include <string.h>
int tcp(short port, const char* ip){
int cfd = socket(AF_INET,SOCK_STREAM,0);// Socket for client
struct sockaddr_in serv_addr; // Socket address used to store the server
char serv_ip_addr[1024];
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
inet_pton(AF_INET,ip,(void*)&(serv_addr.sin_addr.s_addr));
if(cfd == -1){
printf("Socket created failed!");
exit(-1);
return -1;
}
if((connect(cfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr))) == -1){
printf("TCP connection failed!");
exit(-1);
return -1;
}
// Now that the connection is successful , Then type the socket address on the server side
printf("The IP address of the server is %s.\n",inet_ntop(AF_INET,&serv_addr.sin_addr.s_addr,serv_ip_addr,sizeof(serv_ip_addr)));
printf("The port of the server is %d.\n",ntohs(serv_addr.sin_port));
char buf[BUFSIZ];
read(cfd,buf,sizeof(buf));
// because server talk first, So first deal with the cache , Empty it , Avoid affecting the next operation
/* printf("From MTA: %s\n",buf1);
puts("-------------------------------");*/
// Do an experiment here , Look at using read and write Reading and writing socket Is it feasible
// It must be used in this way strcat, Each use
/* char user0[] = "USER "; char user1[] = "wrong ycz18257687229\n"; char* user2 = strcat(user0,user1);
printf("%d\n",strlen(user2));
write(cfd,user2,strlen(user2));
rec1 = read(cfd,buf1,BUFSIZ);
printf("From MTA: %s\n",buf1);
puts("---------------------------------");
char pass0[] = "PASS "; char pass1[] = "wrongCLTWZWKNGARUDDSR\n"; char* pass2 = strcat(pass0,pass1);
write(cfd,pass2,strlen(pass2));
rec1 = read(cfd,buf1,BUFSIZ);
printf("From MTA: %s\n",buf1);
close(cfd);*/
return cfd;
}
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