c++ - 使用 libcurl 在 C++ 中发送电子邮件

Question

我正在关注 libcurl 示例代码并尝试使用它向自己发送电子邮件，但有些事情我不太了解......

#include <stdio.h>
#include <string.h>
#include <curl/curl.h>

/*
 * For an SMTP example using the multi interface please see smtp-multi.c.
 */ 

/* The libcurl options want plain addresses, the viewable headers in the mail
 * can very well get a full name as well.
 */ 
#define FROM_ADDR    "<[e-mail]>"
#define TO_ADDR      "<[e-mail]>"
#define CC_ADDR      "<[e-mail]>"

#define FROM_MAIL "Sender Person " FROM_ADDR
#define TO_MAIL   "A Receiver " TO_ADDR
#define CC_MAIL   "John CC Smith " CC_ADDR

static const char *payload_text[] = {
  "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
  "To: " TO_MAIL "\r\n",
  "From: " FROM_MAIL "\r\n",
  "Cc: " CC_MAIL "\r\n",
  "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
  "rfcpedant.example.org>\r\n",
  "Subject: SMTP example message\r\n",
  "\r\n", /* empty line to divide headers from body, see RFC5322 */ 
  "The body of the message starts here.\r\n",
  "\r\n",
  "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
  "Check RFC5322.\r\n",
  NULL
};

struct upload_status {
  int lines_read;
};

static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
{
  struct upload_status *upload_ctx = (struct upload_status *)userp;
  const char *data;

  if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
    return 0;
  }

  data = payload_text[upload_ctx->lines_read];

  if(data) {
    size_t len = strlen(data);
    memcpy(ptr, data, len);
    upload_ctx->lines_read++;

    return len;
  }

  return 0;
}

int main(void)
{
  CURL *curl;
  CURLcode res = CURLE_OK;
  struct curl_slist *recipients = NULL;
  struct upload_status upload_ctx;

  upload_ctx.lines_read = 0;

  curl = curl_easy_init();
  if(curl) {
    /* This is the URL for your mailserver */ 
    curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");

    /* Note that this option isn't strictly required, omitting it will result
     * in libcurl sending the MAIL FROM command with empty sender data. All
     * autoresponses should have an empty reverse-path, and should be directed
     * to the address in the reverse-path which triggered them. Otherwise,
     * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
     * details.
     */ 
    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_ADDR);

    /* Add two recipients, in this particular case they correspond to the
     * To: and Cc: addressees in the header, but they could be any kind of
     * recipient. */ 
    recipients = curl_slist_append(recipients, TO_ADDR);
    recipients = curl_slist_append(recipients, CC_ADDR);
    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);

    /* We're using a callback function to specify the payload (the headers and
     * body of the message). You could just use the CURLOPT_READDATA option to
     * specify a FILE pointer to read from. */ 
    curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
    curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

    /* Send the message */ 
    res = curl_easy_perform(curl);

    /* Check for errors */ 
    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %s\n",
              curl_easy_strerror(res));

    /* Free the list of recipients */ 
    curl_slist_free_all(recipients);

    /* curl won't send the QUIT command until you call cleanup, so you should
     * be able to re-use this connection for additional messages (setting
     * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling
     * curl_easy_perform() again. It may not be a good idea to keep the
     * connection open for a very long time though (more than a few minutes
     * may result in the server timing out the connection), and you do want to
     * clean up in the end.
     */ 
    curl_easy_cleanup(curl);
  }

  return (int)res;
}

现在它看起来像第一条 curl_easy 线，我需要将其更改为

curl_easy_setopt(curl, CURLOPT_URL, "smtp.gmail.com");

如果我使用的是gmail，对吗？而且由于这是用于外发邮件，所以只要我的外发邮件地址是 gmail 地址，我就不必担心用户正在使用什么？

有点不正常了...

recipients = curl_slist_append(recipients, useremail);

在这种情况下，它将是我的电子邮件。我需要做的就是将其替换为接收电子邮件正确吗？那么发件人呢？

curl_easy_setopt(curl, CURLOPT_MAIL_FROM, myemail);

我猜同样，我需要将其更改为我的电子邮件。但是感觉好像少了点什么。当然，我不能只是告诉这个程序在没有某种授权的情况下发送一封带有我地址的电子邮件，对吧？但是我在代码上看不到任何需要提供密码的地方（显然我不希望它被硬编码，但这是以后的问题），那么这将如何工作？

目前，这些是我需要更改的唯一行（除了特定消息），对吗？我会以正确的方式解决这个问题吗？我还需要做更多的工作吗？授权如何运作？

编辑：我已经根据我认为可行的方法以及对用户名和密码给出的建议进行了更新。我目前有这个错误：

curl_easy_perform() failed: Failed sending data to the peer

不幸的是，它并不太具体说明出了什么问题。这是新版本：

#include <stdio.h>
#include <string.h>
#include <curl/curl.h>

/*
 * For an SMTP example using the multi interface please see smtp-multi.c.
 */ 

/* The libcurl options want plain addresses, the viewable headers in the mail
 * can very well get a full name as well.
 */ 
#define FROM_ADDR    "<[e-mail]>"
#define TO_ADDR      "<[e-mail]>"
#define CC_ADDR      "<[e-mail]>"

#define FROM_MAIL "Sender Person " FROM_ADDR
#define TO_MAIL   "A Receiver " TO_ADDR
#define CC_MAIL   "John CC Smith " CC_ADDR

static const char *payload_text[] = {
  "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
  "To: " TO_MAIL "\r\n",
  "From: " FROM_MAIL "\r\n",
  "Cc: " CC_MAIL "\r\n",
  "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
  "rfcpedant.example.org>\r\n",
  "Subject: SMTP example message\r\n",
  "\r\n", /* empty line to divide headers from body, see RFC5322 */ 
  "The body of the message starts here.\r\n",
  "\r\n",
  "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
  "Check RFC5322.\r\n",
  NULL
};

struct upload_status {
  int lines_read;
};

static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
{
  struct upload_status *upload_ctx = (struct upload_status *)userp;
  const char *data;

  if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
    return 0;
  }

  data = payload_text[upload_ctx->lines_read];

  if(data) {
    size_t len = strlen(data);
    memcpy(ptr, data, len);
    upload_ctx->lines_read++;

    return len;
  }

  return 0;
}

int main(void)
{
  CURL *curl;
  CURLcode res = CURLE_OK;
  struct curl_slist *recipients = NULL;
  struct upload_status upload_ctx;

  upload_ctx.lines_read = 0;

  curl = curl_easy_init();
  if(curl) {
    /* This is the URL for your mailserver */ 
    curl_easy_setopt(curl, CURLOPT_URL, "smtp.gmail.com");

    /* Note that this option isn't strictly required, omitting it will result
     * in libcurl sending the MAIL FROM command with empty sender data. All
     * autoresponses should have an empty reverse-path, and should be directed
     * to the address in the reverse-path which triggered them. Otherwise,
     * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
     * details.
     */ 
    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, "[e-mail]");

    /* Add two recipients, in this particular case they correspond to the
     * To: and Cc: addressees in the header, but they could be any kind of
     * recipient. */ 
    recipients = curl_slist_append(recipients, "[e-mail]");
    recipients = curl_slist_append(recipients, CC_ADDR);
    curl_easy_setopt(curl, CURLOPT_USERNAME, "[e-mail]");
    curl_easy_setopt(curl, CURLOPT_PASSWORD, "mypassword");
    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);

    /* We're using a callback function to specify the payload (the headers and
     * body of the message). You could just use the CURLOPT_READDATA option to
     * specify a FILE pointer to read from. */ 
    curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
    curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

    /* Send the message */ 
    res = curl_easy_perform(curl);

    /* Check for errors */ 
    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %s\n",
              curl_easy_strerror(res));

    /* Free the list of recipients */ 
    curl_slist_free_all(recipients);

    /* curl won't send the QUIT command until you call cleanup, so you should
     * be able to re-use this connection for additional messages (setting
     * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling
     * curl_easy_perform() again. It may not be a good idea to keep the
     * connection open for a very long time though (more than a few minutes
     * may result in the server timing out the connection), and you do want to
     * clean up in the end.
     */ 
    curl_easy_cleanup(curl);
  }

  return (int)res;
}

我没有填写CC_MAIL，但这真的有必要吗？当您发送电子邮件时，Google 通常会自动填写个人的实际姓名。

标签： c++emaillibcurl

Answer 1

你可以在下面设置

curl_easy_setopt(curl, CURLOPT_USERNAME, USERNAME);
curl_easy_setopt(curl, CURLOPT_PASSWORD, PASSWORD);

请参考 curl 上的示例（标签：curl-7_34_0）

https://github.com/curl/curl/blob/curl-7_34_0/docs/examples/smtp-multi.c

推荐参考smtp-tls.c，使用TLS

https://github.com/curl/curl/blob/master/docs/examples/smtp-tls.c