Misc cleanup of tun.c
- Make variables static - open_tun(): First Linux code, then Windows, then BSDs - write_tun()/read_tun(): Split Windows and normal code
This commit is contained in:
Erik Ekman
parent
3ebcd29b13
commit
bf658b0c59
167
src/tun.c
167
src/tun.c
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@ -33,8 +33,8 @@
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#include "windows.h"
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#include <winioctl.h>
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HANDLE dev_handle;
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struct tun_data data;
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static HANDLE dev_handle;
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static struct tun_data data;
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static void get_name(char *ifname, int namelen, char *dev_name);
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@ -60,9 +60,8 @@ static void get_name(char *ifname, int namelen, char *dev_name);
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#include "tun.h"
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#include "common.h"
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char if_name[250];
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static char if_name[250];
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#ifndef WINDOWS32
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#ifdef LINUX
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#include <sys/ioctl.h>
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@ -129,51 +128,8 @@ open_tun(const char *tun_device)
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return -1;
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}
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#else /* BSD */
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#elif WINDOWS32
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int
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open_tun(const char *tun_device)
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{
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int i;
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int tun_fd;
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char tun_name[50];
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if (tun_device != NULL) {
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snprintf(tun_name, sizeof(tun_name), "/dev/%s", tun_device);
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strncpy(if_name, tun_device, sizeof(if_name));
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if_name[sizeof(if_name)-1] = '\0';
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if ((tun_fd = open(tun_name, O_RDWR)) < 0) {
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warn("open_tun: %s: %s", tun_name, strerror(errno));
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return -1;
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}
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fprintf(stderr, "Opened %s\n", tun_name);
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fd_set_close_on_exec(tun_fd);
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return tun_fd;
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} else {
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for (i = 0; i < TUN_MAX_TRY; i++) {
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snprintf(tun_name, sizeof(tun_name), "/dev/tun%d", i);
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if ((tun_fd = open(tun_name, O_RDWR)) >= 0) {
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fprintf(stderr, "Opened %s\n", tun_name);
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snprintf(if_name, sizeof(if_name), "tun%d", i);
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fd_set_close_on_exec(tun_fd);
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return tun_fd;
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}
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if (errno == ENOENT)
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break;
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}
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warn("open_tun: Failed to open tunneling device");
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}
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return -1;
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}
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#endif /* !LINUX */
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#else /* WINDOWS32 */
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static void
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get_device(char *device, int device_len, const char *wanted_dev)
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{
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@ -356,6 +312,50 @@ open_tun(const char *tun_device)
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return tunfd;
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}
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#else /* BSD and friends */
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int
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open_tun(const char *tun_device)
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{
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int i;
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int tun_fd;
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char tun_name[50];
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if (tun_device != NULL) {
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snprintf(tun_name, sizeof(tun_name), "/dev/%s", tun_device);
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strncpy(if_name, tun_device, sizeof(if_name));
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if_name[sizeof(if_name)-1] = '\0';
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if ((tun_fd = open(tun_name, O_RDWR)) < 0) {
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warn("open_tun: %s: %s", tun_name, strerror(errno));
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return -1;
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}
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fprintf(stderr, "Opened %s\n", tun_name);
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fd_set_close_on_exec(tun_fd);
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return tun_fd;
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} else {
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for (i = 0; i < TUN_MAX_TRY; i++) {
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snprintf(tun_name, sizeof(tun_name), "/dev/tun%d", i);
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if ((tun_fd = open(tun_name, O_RDWR)) >= 0) {
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fprintf(stderr, "Opened %s\n", tun_name);
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snprintf(if_name, sizeof(if_name), "tun%d", i);
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fd_set_close_on_exec(tun_fd);
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return tun_fd;
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}
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if (errno == ENOENT)
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break;
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}
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warn("open_tun: Failed to open tunneling device");
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}
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return -1;
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}
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#endif
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void
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@ -365,10 +365,49 @@ close_tun(int tun_fd)
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close(tun_fd);
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}
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#ifdef WINDOWS32
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int
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write_tun(int tun_fd, char *data, size_t len)
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{
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#if defined (FREEBSD) || defined (DARWIN) || defined(NETBSD) || defined(WINDOWS32)
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DWORD written;
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DWORD res;
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OVERLAPPED olpd;
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data += 4;
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len -= 4;
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olpd.Offset = 0;
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olpd.OffsetHigh = 0;
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olpd.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
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res = WriteFile(dev_handle, data, len, &written, &olpd);
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if (!res && GetLastError() == ERROR_IO_PENDING) {
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WaitForSingleObject(olpd.hEvent, INFINITE);
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res = GetOverlappedResult(dev_handle, &olpd, &written, FALSE);
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if (written != len) {
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return -1;
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}
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}
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return 0;
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}
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ssize_t
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read_tun(int tun_fd, char *buf, size_t len)
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{
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int bytes;
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memset(buf, 0, 4);
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bytes = recv(tun_fd, buf + 4, len - 4, 0);
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if (bytes < 0) {
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return bytes;
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} else {
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return bytes + 4;
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}
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}
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#else
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int
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write_tun(int tun_fd, char *data, size_t len)
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{
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#if defined (FREEBSD) || defined (DARWIN) || defined(NETBSD)
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data += 4;
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len -= 4;
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#else /* !FREEBSD/DARWIN */
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@ -385,47 +424,22 @@ write_tun(int tun_fd, char *data, size_t len)
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#endif /* !LINUX */
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#endif /* FREEBSD */
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#ifndef WINDOWS32
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if (write(tun_fd, data, len) != len) {
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warn("write_tun");
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return 1;
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}
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#else /* WINDOWS32 */
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{
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DWORD written;
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DWORD res;
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OVERLAPPED olpd;
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olpd.Offset = 0;
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olpd.OffsetHigh = 0;
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olpd.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
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res = WriteFile(dev_handle, data, len, &written, &olpd);
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if (!res && GetLastError() == ERROR_IO_PENDING) {
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WaitForSingleObject(olpd.hEvent, INFINITE);
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res = GetOverlappedResult(dev_handle, &olpd, &written, FALSE);
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if (written != len) {
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return -1;
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}
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}
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}
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#endif
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return 0;
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}
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ssize_t
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read_tun(int tun_fd, char *buf, size_t len)
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{
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#if defined (FREEBSD) || defined (DARWIN) || defined(NETBSD) || defined(WINDOWS32)
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#if defined (FREEBSD) || defined (DARWIN) || defined(NETBSD)
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/* FreeBSD/Darwin/NetBSD has no header */
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int bytes;
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memset(buf, 0, 4);
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#ifdef WINDOWS32
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/* Windows needs recv() since it is local UDP socket */
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bytes = recv(tun_fd, buf + 4, len - 4, 0);
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#else
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/* The other need read() because fd is not a socket */
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bytes = read(tun_fd, buf + 4, len - 4);
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#endif /*WINDOWS32*/
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if (bytes < 0) {
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return bytes;
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} else {
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@ -435,6 +449,7 @@ read_tun(int tun_fd, char *buf, size_t len)
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return read(tun_fd, buf, len);
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#endif /* !FREEBSD */
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}
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#endif
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int
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tun_setip(const char *ip, const char *other_ip, int netbits)
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