Linux C实现发邮件功能
此功能在嵌入式开发中常用来通知用户。 比如监控异常了,发邮件通知。
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <netdb.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <arpa/inet.h> #include <sys/fcntl.h> #include <sys/stat.h> #define SOCKET_ERROR -1 #define IPSTR "220.181.12.12" #define PRINT(x) printf("%s\n",(x)) int sockfd; int ret; char *send_data; char *recv_data; char From[128]; char To[128]; char Date[128]; char Subject[512]; char Context[6000]={0}; char buffer[1024]; int connectHost(const char *smtpaddr) { struct sockaddr_in servaddr; sockfd = socket(AF_INET,SOCK_STREAM,0); if(sockfd < 0) { printf("Create socket error!\n"); return -1; } bzero(&servaddr,sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(25); if(inet_pton(AF_INET, IPSTR, &servaddr.sin_addr) <= 0 ) { printf("inet_pton error!\n"); return -1; }; if (connect(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr)) < 0) { printf("Connect failed... \n"); return -1; } printf("Connect to %s.... \n", IPSTR); memset(buffer, 0, sizeof(buffer)); if(recv(sockfd, buffer, sizeof(buffer), 0) < 0) { printf("receive failed... \n"); return -1; } else { printf("%s\n", buffer); } return sockfd; } int getResponse() { memset(buffer,0,sizeof(buffer)); ret = recv(sockfd,buffer,1024,0); if(ret == SOCKET_ERROR) { printf("receive nothing\n"); return -1; } buffer[ret]='\0'; if(*buffer == '5') { printf("the order is not support smtp host\n "); return -1; } printf("recieved buffer:%s\n",buffer); return 0; } int login(char *username,char *password) { printf("login.....sockfd: %d\n",sockfd); char ch[100]; if(username == "" || password == "") return -1; send_data = "HELO 163.com\r\n"; printf("%s\n",send_data); ret = send(sockfd, send_data, strlen(send_data), 0); if(ret == SOCKET_ERROR) { close(sockfd); return -1; } if(getResponse() < 0) return -1; send_data = "AUTH LOGIN\r\n"; printf("%s\n",send_data); ret = send(sockfd, send_data, strlen(send_data), 0); if(ret == SOCKET_ERROR) { close(sockfd); return -1; } if(getResponse() < 0) return -1; sprintf(ch, "%s\r\n", username); printf("%s\n",ch); ret = send(sockfd, (char *)ch, strlen(ch),0); if(ret == SOCKET_ERROR) { close(sockfd); return -1; } if(getResponse() < 0) return -1; sprintf(ch,"%s\r\n",password); printf("%s\n",ch); ret = send(sockfd,(char *)ch,strlen(ch),0); if(ret == SOCKET_ERROR) { close(sockfd); return -1; } if(getResponse() < 0) return -1; return 0; } int sendmail(char* from, char * to, char * subject, char * context) { if(from =="" ||to == ""||subject == ""||context == "") { printf("arguments error!\n"); return -1; } sprintf(From, "MAIL FROM: <%s>\r\n", from); printf("%s\n",From); if((ret = send(sockfd, From, strlen(From), 0)) == SOCKET_ERROR) { close(sockfd); return -1; } if(getResponse() < 0) return -1; sprintf(To, "RCPT TO: <%s>\r\n", to); if((ret = send(sockfd, To, strlen(To),0)) == SOCKET_ERROR) { close(sockfd); return -1; } if(getResponse() < 0) return -1; send_data = "DATA\r\n"; if((ret = send(sockfd,send_data,strlen(send_data),0)) == SOCKET_ERROR) { close(sockfd); return -1; } if(getResponse() < 0) return -1; memset(Subject, 0, sizeof(Subject)); sprintf(Subject, "Subject: %s\r\n", subject); strcat(Context, Subject); strcat(Context, "\r\n\r\n"); //strcat(Context,context); strcat(Context,"\r\n.\r\n"); if((ret= send(sockfd, Context, strlen(Context), 0)) == SOCKET_ERROR) { close(sockfd); return -1; } printf("ret size:%d\n", ret); memset(buffer, '\0', sizeof(buffer)); if(getResponse() < 0) return -1; printf("QUIT!!!!!!!!!!!!!!!!\n"); if((ret = send(sockfd,"QUIT\r\n",strlen("QUIT\r\n"), 0)) == SOCKET_ERROR) { close(sockfd); return -1; } if(getResponse() < 0) return -1; printf("Send Mail Successful!\n"); return 0; } int main() { char from[128] = "funnylinux@163.com"; char to[128] = "754056915@qq.com"; char subject[512] = "test...."; char context[6000] = "Just a test.........\n"; char server[56]="smtp.163.com"; char *name ="xxxxxxxxxxxxxx";//base64 char *passwd = "xxxxxxxxxxxxxxx";//base64 if(connectHost(server)<0) { printf("Can Not LOGIN !\n"); return -1; } if(login(name, passwd) < 0) { fprintf(stderr,"Can Not LOGIN !\n"); return -1; } sendmail(from, to, subject, context); return 0; }