#include<iostream>
#include<Windows.h>
#include<winsock.h>
#include <assert.h>
#include<string>
using namespace std;
#pragma comment(lib, "ws2_32.lib")
typedef char uint8;
typedef unsigned long uint32;
static uint8 alphabet_map[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static uint8 reverse_map[] =
{
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 255, 255, 255,
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
{
uint32 i, j;
for (i = 0, j = 0; i + 3 <= text_len; i + = 3)
{
encode [j ++] = alphabet_map [text [i] >> 2]; // Remove the first 6 digits of the first character and find the corresponding result character
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
255, 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, 255, 255, 255, 255, 255
};
uint32 base64_encode ( const uint8 * text, uint32 text_len, uint8 * encode)
encode [j ++] = alphabet_map [((text [i] << 4) & 0x30) | (text [i + 1] >> 4)]; // will Combine the last 2 digits of one character with the first 4 digits of the second character and find the corresponding character
encode [j ++] = alphabet_map [((text [i + 1] << 2) & 0x3c) | (text [ i + 2] >> 6)]; // Combine the last 4 digits of the second character with the first 2 digits of the third character and find the corresponding character
encode [j ++] = alphabet_map [text [i + 2 ] & 0x3f]; // Remove the last 6 digits of the third character and find the resulting character
}
if (i <text_len)
{
uint32 tail = text_len-i;
if (tail == 1)
{
encode [j ++] = alphabet_map [text [i] >> 2];
encode [ j ++] = alphabet_map [(text [i] << 4) & 0x30];
encode [j ++] = '=';
encode [j ++] = '=';
}
else //tail==2
{
encode[j++] = alphabet_map[text[i] >> 2];
encode [j ++] = alphabet_map [((text [i] << 4) & 0x30) | (text [i + 1] >> 4)];
encode [j ++] = alphabet_map [(text [i + 1] << 2) & 0x3c ];
encode [j ++] = '=';
}
}
return j;
}
uint32 base64_decode (const uint8 * code, uint32 code_len, uint8 * plain)
{
// assert ((code_len & 0x03) == 0); // if If its condition returns an error, the program execution is terminated. A multiple of 4.
uint32 i, j = 0;
uint8 quad [4];
for (i = 0; i <code_len; i + = 4)
{
for (uint32 k = 0; k <4; k ++)
{
quad [k] = reverse_map [code [i + k]]; // Grouping, each group of four are converted into decimal numbers in the base64 table in turn
}
assert (quad [0] <64 && quad [1] <64) ;
plain [j ++] = (quad [0] << 2) | (quad [1] >> 4); // Remove the first 6 digits of the decimal number of the base64 table corresponding to the first character and the base64 table of the second character The first two digits of the decimal number are combined
if (quad [2]> = 64)
break;
else if (quad [3]> = 64)
{
plain [j ++] = (quad [1] << 4) | (quad [2] >> 2); // Remove the last 4 digits of the second character corresponding to the base64 table decimal number and the third character corresponding to the first 4 digits of the base64 table decimal number
break;
}
else
{
plain [j ++ ] = (quad [1] << 4) | (quad [2] >> 2);
plain [j ++] = (quad [2] << 6) | quad [3]; // Remove the third character corresponding The last 2 digits of the decimal number of the base64 table are combined with the fourth character
}
}
return j;
}
char * base64 (char * input) (
uint8 * text = (uint8 *) input;
uint32 text_len = (uint32) strlen (( char *) text);
uint8 buffer [1024],buffer2[4096];
uint32 size = base64_encode(text, text_len, buffer2);
buffer2[size] = '\0';
return buffer2;
}//改变编码
SOCKET connect_server(char * host, int port);//连接服务器
void disconnect(SOCKET c) {//断开
closesocket(c);
WSACleanup();
}
void recv_ms(SOCKET c) {
char text[2000];
strnset(text, 0, sizeof(text));
recv(c, text, 2000, 0);
cout << text << endl << endl;
}
void send_ms(SOCKET c, char *msg) {
send(c, msg, strlen(msg), 0);
}
char email[200], pas[200];
int main() {
char host[] = "smtp.qq.com";
char *pstr = NULL;
int port = 25;
SOCKET c;
// establish connection
c = connect_server (host, port);
// receive message
recv_ms (c);
// send message hello
send_ms (c, (char *) "helo qq \ r \ n \ 0");
// Inform login
recv_ms (c);
send_ms (c, (char *) "auth login \ r \ n \ 0");
recv_ms (c);
// start login
cout << "enter mailbox \ n";
cin >> email ;
// rcpt to: <[email protected]>
char buf [200];
char * a = base64 (email);
strcat (a, "\ r \ n \ 0");
send_ms (c, a);
recv_ms (c);
send_ms (c, (char *) "abc \ r \ n \ 0"); // abc represents the base64 encryption of the authorization code
recv_ms (c); // authorization code
memset (buf, 0, sizeof (buf ));
sprintf (buf, "mail from: <% s> \ r \ n \ 0", email);
send_ms(c, buf);
recv_ms (c); // Where to send
printf ("Enter recipient \ n");
cin >> email;
memset (buf, 0, sizeof (buf));
sprintf (buf, "rcpt to: <% s > \ r \ n \ 0 ", email);
send_ms (c, buf);
recv_ms (c); // Where to send
send_ms (c, (char *)" data \ r \ n \ 0 ");
recv_ms ( c);
memset (buf, 0, sizeof (buf));
cout << "input title \ n";
cout << "input title \ n";
cin >> buf; // title
cin >> email; // Content
char ans [2000];
strcpy (ans, "subject:");
strcat (ans, buf);
strcat (ans, "\ r \ n \ r \ n");
strcat (ans, email);
strcat (ans , "\ r \ n. \ r \ n \ 0");
send_ms (c, ans);
recv_ms (c);
disconnect(c);
return 0;
}
SOCKET connect_server(char * host, int port) {
WSADATA wd;
SOCKET c;
SOCKADDR_IN saddr;
struct hostent *pHostent;
int ret = 0;
ret = WSAStartup(MAKEWORD(2, 2), &wd);
if (ret != 0) return 0;
c = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
pHostent = gethostbyname(host);
saddr.sin_addr.S_un.S_addr = *((unsigned long*)pHostent->h_addr_list[0]);//地址
saddr.sin_family = AF_INET;//ipv4
saddr.sin_port = htons(port);//端口
connect(c, (SOCKADDR*)&saddr, sizeof(SOCKADDR));
return c;
}
//[email protected]
//[email protected]
Just learned, according to the big brother, it is mainly called the library, which has an important role in understanding the computer network