C++ 使用winsock（cpp）发送电子邮件时出现问题_C++_Smtp_Winsock2

C++ 使用winsock（cpp）发送电子邮件时出现问题

c++ smtp

C++ 使用winsock（cpp）发送电子邮件时出现问题,c++,smtp,winsock2,C++,Smtp,Winsock2,为什么我的电子邮件不想发送？我尝试在telnet和电子邮件中发送命令。我试图打印服务器的输出，并给了我 235 Authentication succeeded 问题是我想到了“来自piotrek的邮件”。m@mail.com" 从控制台输出 lsd@DESKTOP-U4D23JB:~$ telnet smtp.mail.com 587 Trying 74.208.5.15... Connected to smtp.mail.com. Escape character is '^]'. 22

为什么我的电子邮件不想发送？我尝试在telnet和电子邮件中发送命令。我试图打印服务器的输出，并给了我

235 Authentication succeeded

问题是我想到了“来自piotrek的邮件”。m@mail.com"

从控制台输出

lsd@DESKTOP-U4D23JB:~$ telnet smtp.mail.com 587 Trying 74.208.5.15... Connected to smtp.mail.com. Escape character is '^]'. 220 gmx.com (mrgmxus004) Nemesis ESMTP Service ready EHLO t 250-gmx.com Hello t [79.187.142.70] 250-8BITMIME 250-AUTH LOGIN PLAIN 250-SIZE 141557760 250 STARTTLS AUTH LOGIN 334 VXNlcm5hbWU6 (my base64 login) 334 UGFzc3dvcmQ6 (my base64 pass) 235 Authentication succeeded MAIL FROM: piotrek.m@mail.com 250 Requested mail action okay, completed RCPT TO: piotrek.m@mail.com 250 OK DATA 354 Start mail input; end with <CRLF>.<CRLF> FROM: piotrek.m@mail.com TO: piotrek.m@mail.com SUBJECT: asdfasfdssf asdasdasdasdasdasd . 250 Requested mail action okay, completed: id=0MDiX2-1kTprK3nZO-00HAti

#pragma warning(disable:4996) #include <iostream> #include <cstdio> #include <cstdlib> #include <WinSock2.h> #define SMTP_HOST "smtp.mail.com" #define SMTP_PORT 587 unsigned const char SMTP_USERNAME[] = "examplm@mail.com"; unsigned const char SMTP_PASSWORD[] = "supersecretpassword@"; static int sendmail(const char* from, const char* to, const char* subject, const char* body); static void sendmail_write(const int sock, const char* str, const char* arg); std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len); int main() { char to[] = "piotrek.m@mail.com"; char* from = to; sendmail(from, to, "subject123", "body1234"); } static void sendmail_write(const int sock, const char* str, const char* arg) { char buf[4096]; if (arg != NULL) snprintf(buf, sizeof(buf), str, arg); else snprintf(buf, sizeof(buf), str); send(sock, buf, strlen(buf), 0); } static int sendmail(const char* from, const char* to, const char* subject, const char* body) { sockaddr_in service; WSADATA wsaData; SOCKET sock; struct hostent* remoteHost; int result = WSAStartup(MAKEWORD(2, 2), &wsaData); if (result != NO_ERROR) { std::cout << 1; return -1; } sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (sock == INVALID_SOCKET) { WSACleanup(); return -2; } remoteHost = gethostbyname(SMTP_HOST); memset(&service, 0, sizeof(service)); service.sin_family = AF_INET; service.sin_addr.s_addr = *(u_long*)remoteHost->h_addr_list[0]; service.sin_port = htons(SMTP_PORT); if (connect(sock, (SOCKADDR*)&service, sizeof(service)) == SOCKET_ERROR) { WSACleanup(); return EXIT_FAILURE; } std::string u_b64 = base64_encode(SMTP_USERNAME, strlen((char*)SMTP_USERNAME)) + "\r\n"; std::string p_b64 = base64_encode(SMTP_PASSWORD, strlen((char*)SMTP_PASSWORD)) + "\r\n"; sendmail_write(sock, "EHLO %s\r\n", from); sendmail_write(sock, "AUTH LOGIN\r\n", NULL); sendmail_write(sock, u_b64.c_str(), NULL); sendmail_write(sock, p_b64.c_str(), NULL); sendmail_write(sock, "DATA\n", NULL); sendmail_write(sock, "MAIL FROM: %s\n", from); sendmail_write(sock, "RCPT TO: %s\n", to); sendmail_write(sock, "From: %s\n", from); sendmail_write(sock, "To: %s\n", to); sendmail_write(sock, "Subject: %s\n", subject); sendmail_write(sock, "\n", NULL); sendmail_write(sock, "%s\n", body); sendmail_write(sock, ".\n", NULL); sendmail_write(sock, "QUIT\n", NULL); closesocket(sock); return EXIT_SUCCESS; } std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) { static const std::string base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz" "0123456789+/"; std::string ret; int i = 0; int j = 0; unsigned char char_array_3[3]; unsigned char char_array_4[4]; while (in_len--) { char_array_3[i++] = *(bytes_to_encode++); if (i == 3) { char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); char_array_4[3] = char_array_3[2] & 0x3f; for (i = 0; (i < 4); i++) ret += base64_chars[char_array_4[i]]; i = 0; } } if (i) { for (j = i; j < 3; j++) char_array_3[j] = '\0'; char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); char_array_4[3] = char_array_3[2] & 0x3f; for (j = 0; (j < i + 1); j++) ret += base64_chars[char_array_4[j]]; while ((i++ < 3)) ret += '='; } return ret; }

lsd@DESKTOP-U4D23JB:~$telnet smtp.mail.com 587 正在尝试74.208.5.15。。。已连接到smtp.mail.com。转义字符为“^]”。 220 gmx.com（mrgmxus004）Nemesis ESMTP服务就绪埃洛t 250-gmx.com你好t[79.187.142.70] 250-8比特 250-AUTH普通登录 250号141557760 250标准身份验证登录 334 VXNlcm5hbWU6 （我的base64登录） 334 UGFzc3dvcmQ6 （我的base64通行证） 235身份验证成功邮寄地址：piotrek。m@mail.com 250请求的邮件操作正常，已完成 RCPT收件人：piotrek。m@mail.com 250行资料 354开始邮件输入；以…结束。发件人：piotrek。m@mail.com 致：piotrek。m@mail.com 主题：asdfasfdssf asdasdasdasdasd . 250请求的邮件操作正常，已完成：id=0MDiX2-1kTprK3nZO-00HAti
然后邮件已成功传递，但来自cpp代码的邮件未成功传递
代码

lsd@DESKTOP-U4D23JB:~$ telnet smtp.mail.com 587 Trying 74.208.5.15... Connected to smtp.mail.com. Escape character is '^]'. 220 gmx.com (mrgmxus004) Nemesis ESMTP Service ready EHLO t 250-gmx.com Hello t [79.187.142.70] 250-8BITMIME 250-AUTH LOGIN PLAIN 250-SIZE 141557760 250 STARTTLS AUTH LOGIN 334 VXNlcm5hbWU6 (my base64 login) 334 UGFzc3dvcmQ6 (my base64 pass) 235 Authentication succeeded MAIL FROM: piotrek.m@mail.com 250 Requested mail action okay, completed RCPT TO: piotrek.m@mail.com 250 OK DATA 354 Start mail input; end with <CRLF>.<CRLF> FROM: piotrek.m@mail.com TO: piotrek.m@mail.com SUBJECT: asdfasfdssf asdasdasdasdasdasd . 250 Requested mail action okay, completed: id=0MDiX2-1kTprK3nZO-00HAti

#pragma warning(disable:4996) #include <iostream> #include <cstdio> #include <cstdlib> #include <WinSock2.h> #define SMTP_HOST "smtp.mail.com" #define SMTP_PORT 587 unsigned const char SMTP_USERNAME[] = "examplm@mail.com"; unsigned const char SMTP_PASSWORD[] = "supersecretpassword@"; static int sendmail(const char* from, const char* to, const char* subject, const char* body); static void sendmail_write(const int sock, const char* str, const char* arg); std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len); int main() { char to[] = "piotrek.m@mail.com"; char* from = to; sendmail(from, to, "subject123", "body1234"); } static void sendmail_write(const int sock, const char* str, const char* arg) { char buf[4096]; if (arg != NULL) snprintf(buf, sizeof(buf), str, arg); else snprintf(buf, sizeof(buf), str); send(sock, buf, strlen(buf), 0); } static int sendmail(const char* from, const char* to, const char* subject, const char* body) { sockaddr_in service; WSADATA wsaData; SOCKET sock; struct hostent* remoteHost; int result = WSAStartup(MAKEWORD(2, 2), &wsaData); if (result != NO_ERROR) { std::cout << 1; return -1; } sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (sock == INVALID_SOCKET) { WSACleanup(); return -2; } remoteHost = gethostbyname(SMTP_HOST); memset(&service, 0, sizeof(service)); service.sin_family = AF_INET; service.sin_addr.s_addr = *(u_long*)remoteHost->h_addr_list[0]; service.sin_port = htons(SMTP_PORT); if (connect(sock, (SOCKADDR*)&service, sizeof(service)) == SOCKET_ERROR) { WSACleanup(); return EXIT_FAILURE; } std::string u_b64 = base64_encode(SMTP_USERNAME, strlen((char*)SMTP_USERNAME)) + "\r\n"; std::string p_b64 = base64_encode(SMTP_PASSWORD, strlen((char*)SMTP_PASSWORD)) + "\r\n"; sendmail_write(sock, "EHLO %s\r\n", from); sendmail_write(sock, "AUTH LOGIN\r\n", NULL); sendmail_write(sock, u_b64.c_str(), NULL); sendmail_write(sock, p_b64.c_str(), NULL); sendmail_write(sock, "DATA\n", NULL); sendmail_write(sock, "MAIL FROM: %s\n", from); sendmail_write(sock, "RCPT TO: %s\n", to); sendmail_write(sock, "From: %s\n", from); sendmail_write(sock, "To: %s\n", to); sendmail_write(sock, "Subject: %s\n", subject); sendmail_write(sock, "\n", NULL); sendmail_write(sock, "%s\n", body); sendmail_write(sock, ".\n", NULL); sendmail_write(sock, "QUIT\n", NULL); closesocket(sock); return EXIT_SUCCESS; } std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) { static const std::string base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz" "0123456789+/"; std::string ret; int i = 0; int j = 0; unsigned char char_array_3[3]; unsigned char char_array_4[4]; while (in_len--) { char_array_3[i++] = *(bytes_to_encode++); if (i == 3) { char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); char_array_4[3] = char_array_3[2] & 0x3f; for (i = 0; (i < 4); i++) ret += base64_chars[char_array_4[i]]; i = 0; } } if (i) { for (j = i; j < 3; j++) char_array_3[j] = '\0'; char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); char_array_4[3] = char_array_3[2] & 0x3f; for (j = 0; (j < i + 1); j++) ret += base64_chars[char_array_4[j]]; while ((i++ < 3)) ret += '='; } return ret; }

#杂注警告（禁用：4996） #包括 #包括 #包括 #包括 #定义SMTP_主机“SMTP.mail.com” #定义SMTP_端口587 未签名的常量字符SMTP_用户名[]=“examplm@mail.com"; unsigned const char SMTP_PASSWORD[]=“supersecretpassword@”；静态int sendmail（const char*from，const char*to，const char*subject，const char*body）；静态void sendmail_write（const int sock、const char*str、const char*arg）； std:：string base64_encode（无符号字符常量*bytes_to_encode，无符号整数in_len）； int main（）{ 字符到[]=”piotrek。m@mail.com"; char*from=to；发送邮件（发件人、收件人、“主题123”、“正文1234”）； } 静态void sendmail_write（常量int sock、常量char*str、常量char*arg）{ char-buf[4096]；如果（arg！=NULL） snprintf（buf，sizeof（buf），str，arg）；其他的 snprintf（buf，sizeof（buf），str）；发送（sock、buf、strlen（buf）、0）； } 静态int sendmail（const char*from、const char*to、const char*subject、const char*body）{ 正在使用的sockaddr_； WSADATA WSADATA；插座；结构主机*远程主机； int result=WSAStartup（MAKEWORD（2,2）和wsaData）；如果（结果！=无错误）{ std:：cout h_addr_list[0]； service.sin_port=htons（SMTP_端口）； if（connect（sock，（SOCKADDR*）和service，sizeof（service））==SOCKET\u错误）{ WSACleanup（）；返回退出失败； } std:：string u_b64=base64_编码（SMTP_用户名，strlen（（char*）SMTP_用户名））+“\r\n”； std:：string p_b64=base64_编码（SMTP_密码，strlen（（char*）SMTP_密码））+“\r\n”； sendmail\u write（sock，“EHLO%s\r\n”，来自）； sendmail\u write（sock，“AUTH LOGIN\r\n”，NULL）； sendmail_write（sock，u_b64.c_str（），NULL）； sendmail_write（sock，p_b64.c_str（），NULL）； sendmail_write（sock，“数据\n”，NULL）； sendmail\u write（sock，“邮件发件人：%s\n”，发件人）；发送邮件（sock，“收件人：%s\n”，收件人）； sendmail_write（sock，“发件人：%s\n”，发件人）；发送邮件（sock，“收件人：%s\n”，收件人）； sendmail_write（sock，“主题：%s\n”，主题）； sendmail_write（sock，“\n”，NULL）； sendmail_write（sock，“%s\n”，正文）； sendmail_write（sock，“.\n”，NULL）； sendmail\u write（sock，“QUIT\n”，NULL）；插座；返回退出成功； } std:：string base64_encode（无符号字符常量*bytes_to_encode，无符号整数in_len）{ 静态常量std:：字符串base64_字符= “ABCDEFGHIJKLMNOPQRSTUVWXYZ” “abcdefghijklmnopqrstuvwxyz” "0123456789+/"; std：：字符串ret； int i=0； int j=0；无符号字符数组3[3]；无符号字符数组4[4]；而（在_len--）{ 字符数组3[i++]=*（字节到编码++）；如果（i==3）{ char_数组_4[0]=（char_数组_3[0]&0xfc）>>2； char_数组_4[1]=（（char_数组_3[0]&0x03）>4）； char_数组_4[2]=（（char_数组_3[1]&0x0f）>6）； char_数组_4[3]=char_数组_3[2]&0x3f；对于（i=0；（i<4）；i++） ret+=base64_字符[char_数组_4[i]； i=0； } } 如果（i）{ 对于（j=i；j<3；j++）字符数组_3[j]='\0'； char_数组_4[0]=（char_数组_3[0]&0xfc）>>2； char_数组_4[1]=（（char_数组_3[0]&0x03）>4）； char_数组_4[2]=（（char_数组_3[1]&0x0f）>6）； char_数组_4[3]=char_数组_3[2]&0x3f；对于（j=0；（j
为什么中途停止发送回车？说你需要发送
数据
，它会一直读到看到
你也会在从和RCPT发送邮件之前发送数据。请遵循Postel的原则，确保你的发送通信遵循SMTP协议。你的意思是什么？我举了一个例子第一行在<代码> \r\n>代码>结束，然后切换到<>代码> \n>代码>。您可以考虑读取任何返回的数据来查看是否有任何线索。<代码>邮件：PIOTRAK。m@mail.com和
RCPT TO:piotrek。m@mail.com
是语法无效的SMTP命令。此特定服务器接受格式错误的命令，但不必。请参阅RFC 2821，以了解
邮件自
和
RCPT至
的正确语法。此外，由于没有正确遵循SMTP规范，您正在发送命令，但没有读取任何响应（甚至连服务器的初始问候语都没有）。您不能忽略响应。如果服务器报告了错误，请停止发送新命令（而不是退出），并根据需要向用户报告问题。您也没有检查fa的
gethostbyname（）