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-rw-r--r--src/iface.c179
1 files changed, 113 insertions, 66 deletions
diff --git a/src/iface.c b/src/iface.c
index b2b0d55..043d0bd 100644
--- a/src/iface.c
+++ b/src/iface.c
@@ -88,14 +88,14 @@ static inline fastd_iface_type_t get_iface_type(void) {
}
}
-static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu);
+static bool open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu);
static void cleanup_iface(fastd_iface_t *iface);
#ifdef __linux__
/** Opens the TUN/TAP device helper shared by Android and Linux targets */
-static void open_iface_linux(fastd_iface_t *iface, const char *ifname, uint16_t mtu, const char *dev_name) {
+static bool open_iface_linux(fastd_iface_t *iface, const char *ifname, uint16_t mtu, const char *dev_name) {
struct ifreq ifr = {};
iface->fd = FASTD_POLL_FD(POLL_TYPE_IFACE, open(dev_name, O_RDWR|O_NONBLOCK));
@@ -121,7 +121,7 @@ static void open_iface_linux(fastd_iface_t *iface, const char *ifname, uint16_t
ifr.ifr_flags |= IFF_NO_PI;
if (ioctl(iface->fd.fd, TUNSETIFF, &ifr) < 0) {
pr_error_errno("unable to open TUN/TAP interface: TUNSETIFF ioctl failed");
- goto error;
+ return false;
}
iface->name = fastd_strndup(ifr.ifr_name, IFNAMSIZ-1);
@@ -133,15 +133,11 @@ static void open_iface_linux(fastd_iface_t *iface, const char *ifname, uint16_t
ifr.ifr_mtu = mtu;
if (ioctl(ctx.ioctl_sock, SIOCSIFMTU, &ifr) < 0) {
pr_error_errno("unable to set TUN/TAP interface MTU: SIOCSIFMTU ioctl failed");
- goto error;
+ return false;
}
}
- return;
-
- error:
- close(iface->fd.fd);
- iface->fd.fd = -1;
+ return true;
}
/** Removes TUN/TAP interfaces on platforms which need this */
@@ -153,32 +149,33 @@ static void cleanup_iface(UNUSED fastd_iface_t *iface) {
#if defined(__ANDROID__)
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
+static bool open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
if (conf.android_integration) {
if (get_iface_type() != IFACE_TYPE_TUN)
exit_bug("Non-TUN iface type with Android integration");
pr_debug("using android TUN fd");
iface->fd = FASTD_POLL_FD(POLL_TYPE_IFACE, fastd_android_receive_tunfd());
-
fastd_android_send_pid();
+
+ return true;
} else {
/* this requires root on Android */
- open_iface_linux(iface, ifname, mtu, "/dev/tun");
+ return open_iface_linux(iface, ifname, mtu, "/dev/tun");
}
}
#elif defined(__linux__)
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
- open_iface_linux(iface, ifname, mtu, "/dev/net/tun");
+static bool open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
+ return open_iface_linux(iface, ifname, mtu, "/dev/net/tun");
}
#elif defined(__FreeBSD__) || defined(__OpenBSD__)
/** Sets the MTU of the TUN/TAP device */
-static void set_tun_mtu(fastd_iface_t *iface, uint16_t mtu) {
+static bool set_tun_mtu(fastd_iface_t *iface, uint16_t mtu) {
struct tuninfo tuninfo;
if (ioctl(iface->fd.fd, TUNGIFINFO, &tuninfo) < 0)
@@ -186,8 +183,12 @@ static void set_tun_mtu(fastd_iface_t *iface, uint16_t mtu) {
tuninfo.mtu = mtu;
- if (ioctl(iface->fd.fd, TUNSIFINFO, &tuninfo) < 0)
- exit_errno("TUNSIFINFO ioctl failed");
+ if (ioctl(iface->fd.fd, TUNSIFINFO, &tuninfo) < 0) {
+ pr_error_errno("TUNSIFINFO ioctl failed");
+ return false;
+ }
+
+ return true;
}
/** Removes TUN/TAP interfaces on platforms which need this */
@@ -206,7 +207,7 @@ static void cleanup_iface(fastd_iface_t *iface) {
#ifdef __FreeBSD__
/** Sets the MTU of the TAP device */
-static void set_tap_mtu(fastd_iface_t *iface, uint16_t mtu) {
+static bool set_tap_mtu(fastd_iface_t *iface, uint16_t mtu) {
struct tapinfo tapinfo;
if (ioctl(iface->fd.fd, TAPGIFINFO, &tapinfo) < 0)
@@ -214,21 +215,27 @@ static void set_tap_mtu(fastd_iface_t *iface, uint16_t mtu) {
tapinfo.mtu = mtu;
- if (ioctl(iface->fd.fd, TAPSIFINFO, &tapinfo) < 0)
- exit_errno("TAPSIFINFO ioctl failed");
+ if (ioctl(iface->fd.fd, TAPSIFINFO, &tapinfo) < 0) {
+ pr_error_errno("TAPSIFINFO ioctl failed");
+ return false;
+ }
+
+ return true;
}
/** Sets up the TUN device */
-static void setup_tun(fastd_iface_t *iface, uint16_t mtu) {
+static bool setup_tun(fastd_iface_t *iface, uint16_t mtu) {
int one = 1;
- if (ioctl(iface->fd.fd, TUNSIFHEAD, &one) < 0)
- exit_errno("TUNSIFHEAD ioctl failed");
+ if (ioctl(iface->fd.fd, TUNSIFHEAD, &one) < 0) {
+ pr_error_errno("TUNSIFHEAD ioctl failed");
+ return false;
+ }
- set_tun_mtu(iface, mtu);
+ return set_tun_mtu(iface, mtu);
}
/** Sets up the TAP device */
-static void setup_tap(fastd_iface_t *iface, uint16_t mtu) {
+static bool setup_tap(fastd_iface_t *iface, uint16_t mtu) {
struct ifreq ifr = {};
if (ioctl(iface->fd.fd, TAPGIFNAME, &ifr) < 0)
@@ -237,11 +244,11 @@ static void setup_tap(fastd_iface_t *iface, uint16_t mtu) {
free(iface->name);
iface->name = fastd_strndup(ifr.ifr_name, IFNAMSIZ-1);
- set_tap_mtu(iface, mtu);
+ return set_tap_mtu(iface, mtu);
}
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
+static bool open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
char dev_name[5+IFNAMSIZ] = "/dev/";
const char *type;
@@ -261,8 +268,10 @@ static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
iface->cleanup = true;
if (ifname) {
- if (strlen(ifname) <= 3 || strncmp(ifname, type, 3) != 0)
- exit_error("Invalid %s interface `%s'", type, ifname);
+ if (strlen(ifname) <= 3 || strncmp(ifname, type, 3) != 0) {
+ pr_error("Invalid %s interface `%s'", type, ifname);
+ return false;
+ }
strncat(dev_name, ifname, IFNAMSIZ-1);
@@ -274,29 +283,35 @@ static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
}
iface->fd = FASTD_POLL_FD(POLL_TYPE_IFACE, open(dev_name, O_RDWR|O_NONBLOCK));
- if (iface->fd.fd < 0)
- exit_errno("could not open TUN/TAP device file");
+ if (iface->fd.fd < 0) {
+ pr_error_errno("could not open TUN/TAP device file");
+ return false;
+ }
if (!(iface->name = fdevname_r(iface->fd.fd, fastd_alloc(IFNAMSIZ), IFNAMSIZ)))
exit_errno("could not get TUN/TAP interface name");
switch (get_iface_type()) {
case IFACE_TYPE_TAP:
- setup_tap(iface, mtu);
+ if (!setup_tap(iface, mtu))
+ return false;
break;
case IFACE_TYPE_TUN:
- setup_tun(iface, mtu);
+ if (!setup_tun(iface, mtu))
+ return false;
break;
default:
exit_bug("invalid mode");
}
+
+ return true;
}
#else /* __OpenBSD__ */
-static void set_link0(fastd_iface_t *iface, bool set) {
+static bool set_link0(fastd_iface_t *iface, bool set) {
struct ifreq ifr = {};
strncpy(ifr.ifr_name, iface->name, IFNAMSIZ-1);
@@ -308,52 +323,67 @@ static void set_link0(fastd_iface_t *iface, bool set) {
else
ifr.ifr_flags &= ~IFF_LINK0;
- if (ioctl(ctx.ioctl_sock, SIOCSIFFLAGS, &ifr) < 0)
- exit_errno("SIOCSIFFLAGS ioctl failed");
+ if (ioctl(ctx.ioctl_sock, SIOCSIFFLAGS, &ifr) < 0) {
+ pr_error_errno("SIOCSIFFLAGS ioctl failed");
+ return false;
+ }
+
+ return true;
}
/** Sets up the TUN device */
-static void setup_tun(fastd_iface_t *iface, uint16_t mtu) {
- set_link0(iface, false);
- set_tun_mtu(iface, mtu);
+static bool setup_tun(fastd_iface_t *iface, uint16_t mtu) {
+ return set_link0(iface, false) && set_tun_mtu(iface, mtu);
}
/** Sets up the TAP device */
-static void setup_tap(fastd_iface_t *iface, uint16_t mtu) {
- set_link0(iface, true);
- set_tun_mtu(iface, mtu);
+static bool setup_tap(fastd_iface_t *iface, uint16_t mtu) {
+ return set_link0(iface, true) && set_tun_mtu(iface, mtu);
}
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
+static bool open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
char dev_name[5+IFNAMSIZ] = "/dev/";
- if (!ifname)
- exit_error("config error: no interface name given.");
- else if (strncmp(ifname, "tun", 3) != 0)
- exit_error("config error: `%s' doesn't seem to be a tun device", ifname);
- else
+ if (!ifname) {
+ pr_error("config error: no interface name given.");
+ return false;
+ }
+ else if (strncmp(ifname, "tun", 3) != 0) {
+ pr_error("config error: `%s' doesn't seem to be a TUN device", ifname);
+ return false;
+ }
+ else {
strncat(dev_name, ifname, IFNAMSIZ-1);
+ }
- iface->cleanup = !if_nametoindex(ifname);
+ bool cleanup = !if_nametoindex(ifname);
iface->fd = FASTD_POLL_FD(POLL_TYPE_IFACE, open(dev_name, O_RDWR|O_NONBLOCK));
- if (iface->fd.fd < 0)
- exit_errno("could not open tun device file");
+ if (iface->fd.fd < 0) {
+ pr_error_errno("could not open TUN device file");
+ return false;
+ }
iface->name = fastd_strndup(ifname, IFNAMSIZ-1);
switch (get_iface_type()) {
case IFACE_TYPE_TAP:
- setup_tap(iface, mtu);
+ if (!setup_tap(iface, mtu))
+ return false;
+
+ iface->cleanup = cleanup;
break;
case IFACE_TYPE_TUN:
- setup_tun(iface, mtu);
+ if (!setup_tun(iface, mtu))
+ return false;
break;
default:
exit_bug("invalid mode");
}
+
+ return true;
}
#endif
@@ -361,7 +391,7 @@ static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
#elif __APPLE__
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
+static bool open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
const char *devtype;
switch (get_iface_type()) {
case IFACE_TYPE_TAP:
@@ -377,24 +407,35 @@ static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
}
char dev_name[5+IFNAMSIZ] = "/dev/";
- if (!ifname)
- exit_error("config error: no interface name given.");
- else if (strncmp(ifname, devtype, 3) != 0)
- exit_error("config error: `%s' doesn't seem to be a %s device", ifname, devtype);
- else
+ if (!ifname) {
+ pr_error("config error: no interface name given.");
+ return false;
+ }
+ else if (strncmp(ifname, devtype, 3) != 0) {
+ pr_error("config error: `%s' doesn't seem to be a %s device", ifname, devtype);
+ return false;
+ }
+ else {
strncat(dev_name, ifname, IFNAMSIZ-1);
+ }
iface->fd = FASTD_POLL_FD(POLL_TYPE_IFACE, open(dev_name, O_RDWR|O_NONBLOCK));
- if (iface->fd.fd < 0)
- exit_errno("could not open tun device file");
+ if (iface->fd.fd < 0) {
+ pr_error_errno("could not open TUN device file");
+ return false;
+ }
iface->name = fastd_strndup(ifname, IFNAMSIZ-1);
struct ifreq ifr = {};
strncpy(ifr.ifr_name, ifname, IFNAMSIZ-1);
ifr.ifr_mtu = mtu;
- if (ioctl(ctx.ioctl_sock, SIOCSIFMTU, &ifr) < 0)
- exit_errno("SIOCSIFMTU ioctl failed");
+ if (ioctl(ctx.ioctl_sock, SIOCSIFMTU, &ifr) < 0) {
+ pr_error_errno("SIOCSIFMTU ioctl failed");
+ return false;
+ }
+
+ return true;
}
/** Removes TUN/TAP interfaces on platforms which need this */
@@ -508,7 +549,7 @@ fastd_iface_t * fastd_iface_open(fastd_peer_t *peer) {
}
}
else {
- pr_error("Invalid TUN/TAP device name: `%%n' and `%%k' patterns can't be used in TAP mode");
+ pr_error("invalid TUN/TAP device name: `%%n' and `%%k' patterns can't be used in TAP mode");
return NULL;
}
}
@@ -518,9 +559,15 @@ fastd_iface_t * fastd_iface_open(fastd_peer_t *peer) {
iface->mtu = fastd_peer_get_mtu(peer);
pr_debug("initializing TUN/TAP device...");
- open_iface(iface, ifname, iface->mtu);
- if (iface->fd.fd < 0) {
+ if (!open_iface(iface, ifname, iface->mtu)) {
+ if (iface->fd.fd >= 0) {
+ if (close(iface->fd.fd) == 0)
+ cleanup_iface(iface);
+ else
+ pr_warn_errno("closing TUN/TAP: close");
+ }
+
free(iface->name);
free(iface);
return NULL;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 00:29:03 +0100