ubuntuopenssl 连接gmial smtp服务

引用我的代码片

OpenSSL 是一个安全套接字层密码库，囊括主要的密码算法、常用的密钥和证书封装管理功能及SSL协议，并提供丰富的应用程序供测试或其它目的使用

1.安装开发库

sudo apt-get install libssl-dev2.创建c语言文件

我命名为 test.c

3.包含ssl头文件

/*openssl*/ #include <openssl/ssl.h> #include <openssl/bio.h>4.包含socket头文件

/*socket*/ #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> #include <arpa/inet.h>

5.添加标准库

#include<stdio.h> #include<stdlib.h> #include<string.h>

6.添加一个结构体保存基本信息

struct email{ char *username; //登陆用户名 char *password; //登陆密码 char *from; //邮箱来自 char *send; //邮箱发送 char *title; //邮件标题 char *body; //邮件内容 }mail;

7.新建一个函数 GetEmailInfo() 用于获取基本信息

int GetEmailInfo() { mail.username = (char *)malloc(64 * (sizeof(char))); mail.password = (char *)malloc(64 * (sizeof(char))); mail.title = (char *)malloc(64 * (sizeof(char))); mail.body = (char *)malloc(64 * (sizeof(char))); mail.send = (char *)malloc(64 * (sizeof(char))); mail.from = (char *)malloc(64 * (sizeof(char))); printf("请输入你的邮箱地址:"); scanf("%s",mail.username); printf("请输入你的邮箱密码:"); scanf("%s", mail.password); printf("请输入收件人信息:"); scanf("%s", mail.send); printf("请输入邮件的标题:"); scanf("%s",mail.title); printf("请输入邮件内容:"); scanf("%s",mail.body); strcpy(mail.from, mail.username); return 0; }

8. 新建函数 char *GetIpAddress(const char *domain) 用于把域名转换为ip

char *GetIpAddress(const char *domain){ const char *ip = NULL; struct in_addr *host_name; struct hostent *list =gethostbyname(domain); int x=0; for(x;list->h_addr_list[x]!=0;x++){ host_name= list->h_addr_list[x]; ip = inet_ntoa(*host_name); } return ip; } 9.新建函数 ConnectServer(const char * ServerAddr)用于连接服务器

int connectToServer(const char *ServerAdd){ int socket_fd = socket(AF_INET,SOCK_STREAM,IPPROTO_IP); struct sockaddr_in client; memset(&client,0,sizeof(client)); client.sin_family = AF_INET; client.sin_port =htons(465); if(inet_pton(AF_INET,GetIpAddress(ServerAdd),&client.sin_addr)==1){ connect(socket_fd,&client,sizeof(client)); } return socket_fd; }

10.base64

const char * base64char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; char * mybase64_encode( const unsigned char * bindata, char * base64, int binlength ) { int i, j; unsigned char current; for ( i = 0, j = 0 ; i < binlength ; i += 3 ) { current = (bindata[i] >> 2) ; current &= (unsigned char)0x3F; base64[j++] = base64char[(int)current]; current = ( (unsigned char)(bindata[i] << 4 ) ) & ( (unsigned char)0x30 ) ; if ( i + 1 >= binlength ) { base64[j++] = base64char[(int)current]; base64[j++] = '='; base64[j++] = '='; break; } current |= ( (unsigned char)(bindata[i+1] >> 4) ) & ( (unsigned char) 0x0F ); base64[j++] = base64char[(int)current]; current = ( (unsigned char)(bindata[i+1] << 2) ) & ( (unsigned char)0x3C ) ; if ( i + 2 >= binlength ) { base64[j++] = base64char[(int)current]; base64[j++] = '='; break; } current |= ( (unsigned char)(bindata[i+2] >> 6) ) & ( (unsigned char) 0x03 ); base64[j++] = base64char[(int)current]; current = ( (unsigned char)bindata[i+2] ) & ( (unsigned char)0x3F ) ; base64[j++] = base64char[(int)current]; } base64[j] = '\0'; return base64; }

11.主函数

int main(void){ GetEmailInfo(); BIO *obj_bio =NULL; BIO *obj_out =NULL; const SSL_METHOD *method =NULL; SSL_CTX *ctx=NULL; SSL *ssl; int connect_fd = 0; int ret,i; ret=i=0; OpenSSL_add_all_algorithms(); ERR_load_BIO_strings(); ERR_load_CRYPTO_strings(); SSL_load_error_strings(); obj_bio = BIO_new(BIO_s_file()); obj_out = BIO_new_fp(stdout,BIO_NOCLOSE); if(SSL_library_init()<=0){ BIO_printf(obj_out,"ssl iniliatile fail"); } else{ method = SSLv23_client_method(); if((ctx=SSL_CTX_new(method))==NULL){ BIO_printf(obj_out,"open ssl fail"); } else{ SSL_CTX_set_options(ctx,SSL_OP_NO_SSLv2); ssl=SSL_new(ctx); connect_fd = connectToServer("smtp.gmail.com"); if(connect_fd!=0){ BIO_printf(obj_out,"success connect\n"); SSL_set_fd(ssl,connect_fd); if(SSL_connect(ssl) !=0){ char *rn ="\r\n"; char buf[4096]; char rbuf[4768]; memset(buf,0,sizeof(buf)); memset(rbuf,0,sizeof(rbuf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); strcpy(&buf,"HELO SERVER"); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(&buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); strcpy(&buf,"AUTH LOGIN"); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(&buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); mybase64_encode(mail.username,&buf,strlen(mail.username)); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf));; mybase64_encode(mail.password,&buf,strlen(mail.password)); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); strcpy(buf,"mail from:<"); strcat(buf,mail.from); strcat(buf,">"); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); strcpy(buf,"rcpt to:<"); strcat(buf,mail.send); strcat(buf,">"); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); strcpy(buf,"data"); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); strcpy(buf,"subject:"); strcat(buf,mail.title); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(buf,0,sizeof(buf)); strcat(buf,mail.body); strcat(buf,rn); strcat(buf,"."); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); strcpy(buf,"quit"); strcat(buf,rn); SSL_write(ssl,buf,strlen(buf)); BIO_printf(obj_out,buf); memset(buf,0,sizeof(buf)); SSL_read(ssl,rbuf,sizeof(rbuf)); BIO_printf(obj_out,rbuf); memset(rbuf,0,sizeof(rbuf)); } } } } return 0; }