mirror of https://github.com/deavmi/libtun.git
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/**
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* This module is used just to interface between the Linux
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* kernel (via GLIBC) such that the tun adpater can be setup
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* and destroyed
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*
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* `int createTun(char* interfaceName)`
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* - This creates a tun interface with the provided name
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* - and returns the fd
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* `int destroyTun(int fd)`
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* - This destroys the tun interface given
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*
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* Once we have the fd everything else can be done in D
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* as we just read()/write() on the returned fd we got
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* using `createTun`
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*/
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#include<linux/if.h>
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#include<linux/if_tun.h>
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#include<fcntl.h>
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#include<string.h>
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#include<sys/ioctl.h>
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#include<unistd.h>
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#include<stdint.h>
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/* TODO: Update types here using stdint */
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//TODO: We could possibly use directly
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uint32_t createTun(char* interfaceName, int32_t iffFlags)
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{
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/* TODO: Add all required error checking */
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int32_t tunFD = open("/dev/net/tun", O_RDWR);
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/* If error */
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if(tunFD < 0)
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{
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return tunFD;
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}
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/* TUN properties */
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struct ifreq interfaceReqData;
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/* TODO: Do tuntype */
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/* Set the flags for the tun adapter */
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interfaceReqData.ifr_flags = iffFlags;
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/* Set the requested interface's name */
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strcpy(interfaceReqData.ifr_name, interfaceName);
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/* Attempt to bring up the tun device node */
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int32_t tunStatus = ioctl(tunFD, TUNSETIFF, &interfaceReqData);
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if(tunStatus < 0)
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{
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tunFD = tunStatus;
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}
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return tunFD;
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}
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//TOOD: Maybe use directly
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uint32_t destroyTun(uint32_t fd)
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{
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return close(fd);
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}
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//TODO: Maybe use directly
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uint32_t tunWrite(uint32_t fd, char* data, int length)
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{
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write(fd, data, length);
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}
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/**
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* TODO: Depending on mode we need to read a certain amount
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* to get the length and then from there move onwards
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*
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* (FIXME: For now we just read 20 bytes)
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*/
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//TODO: Maybe use directly
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uint32_t tunRead(uint32_t fd, char* data, int amount)
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{
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return read(fd, data, amount);
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}
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// uint32_t tunSet()
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