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How to open utun device in OS X
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#include <netinet/in.h> | |
#include <string.h> | |
#include <sys/socket.h> | |
#include <sys/kern_control.h> | |
#include <net/if_utun.h> | |
#include <sys/ioctl.h> | |
#include <sys/kern_event.h> | |
int open_utun(int num) { | |
int err; | |
int fd; | |
struct sockaddr_ctl addr; | |
struct ctl_info info; | |
fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL); | |
if (fd < 0) { | |
return fd; | |
} | |
memset(&info, 0, sizeof (info)); | |
strncpy(info.ctl_name, UTUN_CONTROL_NAME, strlen(UTUN_CONTROL_NAME)); | |
err = ioctl(fd, CTLIOCGINFO, &info); | |
if (err < 0) { | |
close(fd); | |
return err; | |
} | |
addr.sc_id = info.ctl_id; | |
addr.sc_len = sizeof(addr); | |
addr.sc_family = AF_SYSTEM; | |
addr.ss_sysaddr = AF_SYS_CONTROL; | |
addr.sc_unit = num + 1; // utunX where X is sc.sc_unit -1 | |
err = connect(fd, (struct sockaddr*)&addr, sizeof(addr)); | |
if (err < 0) { | |
// this utun is in use | |
close(fd); | |
return err; | |
} | |
return fd; | |
} | |
int main(void) { | |
int fd; | |
for (int num = 0; num < 255; ++num) { | |
fd = open_utun(); | |
if (fd >= 0) { | |
break; | |
} | |
} | |
// hava fun | |
} |
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