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lvm.c
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lvm.c
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#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>
#include <string.h>
#include <sys/times.h>
#include <sys/select.h>
#include <sys/types.h>
#include <string.h>
#include <signal.h>
struct ProcessInfo{
FILE *stream; /// Pointer to the duplex pipe stream
pid_t pid; /// Process ID of the command
};
/*creat a pipe between this process and the process created by "command"*/
struct ProcessInfo* dpopen(char *const command[])
{
int fd[2];
pid_t pid;
FILE *stream;
struct ProcessInfo *pi;
socketpair(AF_UNIX, SOCK_STREAM, 0, fd); //creat pipe
if ( (pid = fork()) == 0) { //child process
close(fd[0]); // close parent end
dup2(fd[1], STDOUT_FILENO); // duplicate child end to standard ouput
dup2(fd[1], STDIN_FILENO); // duplicate child end to standard input
close(fd[1]); // close duplicated reading pipe.
execvp(command[0],command);/* execute command using exec */
} else { // parent process
close(fd[1]); // close child end
stream= fdopen(fd[0], "r+");
pi = (struct ProcessInfo*)malloc(sizeof(struct ProcessInfo));
pi->stream = stream;
/* Successfully return here */
pi->pid = pid;
return pi;
}
}
int lastpid;
void killp(int sig)
{
if(lastpid != 0)
kill(lastpid, sig);
lastpid = 0;
}
int main()
{
struct ProcessInfo *vm[128];
FILE *vms;
char *const cmd[] = {"vm", "-n", "bash", "-m", NULL};
char buf[1024], inbuf[2048] = "vm -p \0", outbuf[1024], c, vmn_c[5],hosti[20]="host-vm\0", vmi[20]="eth0-vm\0";
int i, cmdlen, n, vn, vmn, nextip=1;
fd_set fds;
struct timeval timeout={0,0};
lastpid = 0;
char *tail = ";printf \"\\177\\n\"\n";
printf("How many virtual machine you want to create(1~255):");
scanf("%d", &vmn);
scanf("%c",&c);
/*Create a links between bridge host and vms*/
for(i = 0; i <= vmn - 1; ++i)
{
vm[i] = dpopen(cmd);
sprintf(vmn_c, "%d", i);
hosti[7]= '\0';
vmi[7]= '\0';
strcat(hosti, vmn_c);
strcat(vmi, vmn_c);
sprintf(buf, "ip link add name %s type veth peer name %s", hosti, vmi);
system(buf);
sprintf(buf, "sudo ip link set %s netns %d\n", vmi, vm[i]->pid);
system(buf);
sprintf(buf,"ifconfig %s up\n", vmi);
fwrite(buf, strlen(buf)+1, 1, vm[i]->stream);
sprintf(buf,"ifconfig %s 192.168.38.%d\n", vmi,nextip);
fwrite(buf, strlen(buf)+1, 1, vm[i]->stream);
++nextip;
sprintf(buf,"ifconfig lo up\n");
fwrite(buf, strlen(buf)+1, 1, vm[i]->stream);
}
signal(SIGINT,killp);
/*CLI*/
while(1)
{
printf(">>>");
scanf("%c",&c);
for(i=0; i<=1023 && c != '\n'; i++)
{
buf[i] = c;
scanf("%c",&c);
}
buf[i] = '\0';
cmdlen = i+1;
if(buf[0] == 'v' && buf[1] == 'm')
{
for(i=2; buf[i] >= '0' && buf[i] <='9' && i <= cmdlen-1 ; ++i)
{
vmn_c[i-2] = buf[i];
}
if(buf[i] == ' ' || buf[i] == '\0')
{
vmn_c[i-2] = buf[i];
n = atoi(vmn_c);
if(n <= vmn-1)
{
vms = vm[n]->stream;
}
else
{
printf("ERROR: vm%d is not exist!\n", n);
continue;
}
}
else
{
printf("ERROR: Unknown virtual machine!\n");
continue;
}
inbuf[30] = '\0';
strcat(inbuf,&buf[i]);
strcat(inbuf, tail);
fwrite(inbuf, strlen(inbuf)+1, 1, vms);
select((int)vms+1, &fds, &fds, NULL, &timeout);
fgets(outbuf, 1024, vms);
for(i = 0; outbuf[0] != '\177'; ++i)
{
if(outbuf[0] == '\1')
{
lastpid = atoi(&outbuf[1]);
}
else
printf("%s", outbuf);
fgets(outbuf, 1024, vms);
}
}
else if(!strcmp(buf,"exit\0"))
{
return;
}
else if(!strcmp(buf,"\0"))
{
continue;
}
else
printf("ERROR: Unidentifiable command!\n");
}
return 0;
}