我无法使用 Curl 发送电子邮件

Question

我的目标是通过 Curl C 程序用 gmail 发送电子邮件。每当我运行此命令时，即使我指定了使用 SSL 的选项，我也会收到 SSL 错误

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

static size_t payload_source(char *ptr, size_t size, size_t nmemb, void *userp);

typedef struct {
  size_t bytes_read;
} upload_status;

char *from_addr = "<[email protected]>";
char *to_addr = "<[email protected]>";

static const char *payload_text =
  "To: " "<[email protected]>" "\r\n"
  "From: " "<[email protected]>" "\r\n"
  "Cc: " "" "\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 RFC 5322 */
  "This message is a test\r\n"
  "\r\n"
  "It could be a lot of lines, could be MIME encoded, whatever.\r\n"
  "Check RFC 5322.\r\n";

int main(void)
{
    CURL *curl;
    CURLcode res = CURLE_OK;
    struct curl_slist *recipients = NULL;
    upload_status upload = { 0 };
    printf("This is a curl program\n");
    
    curl = curl_easy_init();

    if(!curl)
    {
        printf("Curl wasn't initialized!\n");
        return 1;
    }

    printf("Curl was initialized!\n");

    curl_easy_setopt(curl, CURLOPT_URL, "smtps://smtp.gmail.com:465");

    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, from_addr);

    recipients = curl_slist_append(recipients, to_addr);
    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);

    curl_easy_setopt(curl, CURLOPT_USE_SSL, 1L);
    curl_easy_setopt(curl, CURLOPT_USERNAME, from_addr);
    curl_easy_setopt(curl, CURLOPT_PASSWORD, "password");

    curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
    curl_easy_setopt(curl, CURLOPT_READDATA, &upload);
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

    curl_easy_setopt(curl, CURLOPT_HTTPAUTH, (long)CURLAUTH_ANY);

    printf("Sending email...\n");
    res = curl_easy_perform(curl);
    printf("%d %d\n", (int)res, (int)CURLE_OK);

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

    curl_slist_free_all(recipients);
    curl_easy_cleanup(curl);

    return (int)res;
}

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

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

    data = &payload_text[upload_ctx->bytes_read];

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

    return len;
    }

    return 0;
}

我从这段代码中得到的错误消息是：“SSL 对等证书或 SSH 远程密钥不正常”

如果我将 cacert.pem 的路径添加到 CURLOPT_SSLCERT，我会得到：“本地 SSL 证书出现问题”和“无法设置私钥文件：‘cacert.pem’类型 PEM”

如果我将路径添加到curl-ca-bundle.crt，我会得到：“本地SSL证书有问题”和“无法设置私钥文件：'cert.crt'类型PEM”

Answer 1

我相信谷歌不再允许使用没有令牌（API）的基本身份验证。

愿本主题对您有所帮助： curl 可以不再使用 gmail 帐户发送电子邮件吗？