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pop3.c
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pop3.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "database.h"
#include "pop3.h"
void pop3_handler(FILE *client, void *arg)
{
pop3(client, (const char *) arg);
}
#define RESPOND(client, format, args...) \
fprintf(client, format "\n", args)
void pop3(FILE *client, const char *dbfile)
{
struct database db;
if (database_open(&db, dbfile) != 0) {
RESPOND(client, "%s", "-ERR");
fclose(client);
return;
} else {
RESPOND(client, "+OK %s", "POP3 server ready");
}
char user[512] = {0};
char pass[512] = {0};
char email[512] = {0};
char pass1[512] = {0};
char pass2[512] = {0};
char firstname[512] = {0};
char lastname[512] = {0};
struct message_email *messages = NULL;
struct message_user *messages_user = NULL;
while (!feof(client)) {
char line[512];
printf("Client message: %s", line);
if(fgets(line, sizeof(line), client)){}
char command[5] = {line[0], line[1], line[2], line[3]};
if(strcmp(command,"CREA") == 0){
int i;
int count = 0;
int errorCreate = 0;
if (strlen(line) > 5) {
char *a = line + 5, *b = email,*c = firstname,*d = lastname,*e = pass1,*f = pass2;
for(i = 0;i<strlen(line);i++)
if(line[i] =='+')
count++;
if(count==5){
while (*a!='+')
*(b++) = *(a++);
*b = '\0';
a++;
while (*a!='+')
*(c++) = *(a++);
*c = '\0';
a++;
while (*a!='+')
*(d++) = *(a++);
*d = '\0';
a++;
while (*a!='+')
*(e++) = *(a++);
*e = '\0';
a++;
while (*a!='+')
*(f++) = *(a++);
*f = '\0';
i=0;
messages_user = database_list_user_signin(&db,email,pass1);
for(struct message_user *m = messages_user; m; m = m->next){
i++;
}
if(i!=0){
errorCreate = 1;
} else
errorCreate = 0;
if(!errorCreate){
database_send_user(&db,email,firstname,lastname,pass1,pass2);
RESPOND(client,"%s","+OK");
}else RESPOND(client,"%s","-ER");
}
}
}else if (strcmp(command, "USER") == 0) {
if (strlen(line) > 5) {
char *a = line + 5, *b = user;
while (*a!='+')
*(b++) = *(a++);
*b = '\0';
RESPOND(client, "%s", "+OKUSER");
} else {
RESPOND(client, "%s", "-ERRUSER");
}
printf("|%s|\n",user);
messages = database_list_email(&db, user);
} else if (strcmp(command, "PASS") == 0) {
if (strlen(line) > 5) {
char *a = line + 5, *b = pass;
while (*a!='+')
*(b++) = *(a++);
*b = '\0';
if(!user[0])
RESPOND(client,"%s","-ERR enter user first");
else{
messages_user = database_list_user_signin(&db,user,pass);
int i = 0;
for(struct message_user *m = messages_user; m; m = m->next){
i++;
}
if(i!=1){
RESPOND(client,"%s","-ER");
} else
RESPOND(client,"%s","+OK");
}
}
} else if (strcmp(command, "FORG") == 0) {
if (strlen(line) > 5) {
char *a = line + 5, *b = pass;
while (*a!='+')
*(b++) = *(a++);
*b = '\0';
if(!user[0])
RESPOND(client,"%s","-ERR enter user first");
else{
messages_user = database_list_user_forgotpassword(&db,user,pass);
int i = 0;
for(struct message_user *m = messages_user; m; m = m->next){
i++;
RESPOND(client, "email: %s\npassword: %s", m->email, m->pass1);
}
if(i!=1){
RESPOND(client,"%s","Wrong level 2 password.");
}
}
}
}else if (strcmp(command, "STAT") == 0) {
int count = 0, size = 0;
for (struct message_email *m = messages; m; m = m->next) {
count++;
size += m->length;
}
RESPOND(client, "+OK %d %d", count, size);
} else if (strcmp(command, "LIST") == 0) {
int temp1=0;
for (struct message_email *m = messages; m; m = m->next){
temp1++;
char temp[1000];
char tempuser[1000];
int i=0;
while(m->content[i]!='\n'){
temp[i] = m->content[i];
i++;
}
temp[i]='\0';
i=0;
while(m->user[i]!='\n' && m->user[i]!='\r'){
tempuser[i] = m->user[i];
i++;
}
tempuser[i]='\0';
RESPOND(client, "%-5d | %-30s | %-30s", m->id, temp,tempuser);
}
if(temp1==0)
RESPOND(client,"%s","inbox is empty!");
}else if (strcmp(command, "RETR") == 0) {
int id = atoi(line + 4);
int found = 0;
for (struct message_email *m = messages; m; m = m->next)
if (m->id == id) {
found = 1;
RESPOND(client, " - Mail from: %s", m->user);
RESPOND(client, " - Subject: %s",m->content);
}
RESPOND(client, "%s", found ? "." : "-ERR");
} else if (strcmp(command, "DELE") == 0) {
int id = atoi(line + 4);
int found = 0;
for (struct message_email *m = messages; m; m = m->next) {
if (m->id == id) {
found = 1;
RESPOND(client, "%s", "+OK");
database_delete_email(&db, id);
break;
}
}
if (!found)
RESPOND(client, "%s", "-ERRor");
} else if (strcmp(command, "TOP ") == 0) {
int id, lines;
sscanf(line, "TOP %d %d", &id, &lines);
int found = 0;
for (struct message_email *m = messages; m; m = m->next) {
if (m->id == id) {
RESPOND(client, "%s", "+OK");
found = 1;
char *p = m->content;
while (*p && memcmp(p, "\r\n\r\n", 4) != 0) {
fputc(*p, client);
p++;
}
if (*p) {
p += 4;
int line = 0;
while (*p && line < lines) {
if (*p == '\n')
line++;
p++;
}
}
break;
}
}
RESPOND(client, "%s", found ? "\r\n." : "-ERR");
} else if (strcmp(command, "QUIT") == 0) {
RESPOND(client, "%s", "+OK");
break;
} else {
RESPOND(client, "%s", "-ERR");
}
}
while (messages) {
struct message_email *dead = messages;
messages = messages->next;
free(dead);
}
fclose(client);
database_close(&db);
}