tobast/congestvpn
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C rewrite: phase out exceptions

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This commit is contained in:
Théophile Bastian 2020-07-22 19:09:27 +02:00
parent 7c1e5562f2
commit ecc996f3f0
12 changed files with 67 additions and 149 deletions
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34
TunDevice.cpp
View file

@ -18,8 +18,8 @@ TunDevice::TunDevice(const std::string& dev)
int fd;
if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) {
throw TunDevice::InitializationError(
"Cannot open /dev/net/tun", errno, true);
perror("Tun device: cannot open /dev/net/tun: ");
exit(1);
}
memset(&ifr, 0, sizeof(ifr));
@ -31,15 +31,17 @@ TunDevice::TunDevice(const std::string& dev)
*/
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
if(!dev.empty()) {
if(dev.size() >= IFNAMSIZ - 2)
throw TunDevice::InitializationError("Device name is too long.");
if(dev.size() >= IFNAMSIZ - 2) {
fprintf(stderr, "Tun device: device name is too long.\n");
exit(1);
}
strncpy(ifr.ifr_name, dev.c_str(), IFNAMSIZ-1);
}
if(ioctl(fd, TUNSETIFF, (void *) &ifr) < 0){
close(fd);
throw TunDevice::InitializationError(
"Tunnel interface failed [TUNSETIFF]", errno, true);
perror("Tun device: tunnel interface failed [TUNSETIFF]: ");
exit(1);
}
_dev_name = ifr.ifr_name;
_fd = fd;
@ -50,16 +52,16 @@ TunDevice::TunDevice(const std::string& dev)
if(ioctl(sockfd, SIOCGIFFLAGS, (void*) &ifr) < 0) {
close(fd);
close(sockfd);
throw TunDevice::InitializationError(
"Could not get tunnel interface flags", errno, true);
perror("Tun device: could not get tunnel interface flags: ");
exit(1);
}
ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
if(ioctl(sockfd, SIOCSIFFLAGS, (void*) &ifr) < 0) {
close(fd);
close(sockfd);
throw TunDevice::InitializationError(
"Could not bring tunnel interface up", errno, true);
perror("Tun device: could not bring tunnel interface up: ");
exit(1);
}
close(sockfd);
@ -102,8 +104,8 @@ size_t TunDevice::poll_packet(char* read_buffer, size_t buf_size, int timeout) {
if(poll_rc < 0) {
if(errno == EINTR) // Interrupt.
return 0;
throw TunDevice::NetError(
"Error polling from interface", errno, true);
perror("Tun device: error polling from interface: ");
exit(1);
}
else if(poll_rc == 0 || (_poll_fd.revents & POLLIN) == 0) {
// Nothing to read
@ -116,8 +118,8 @@ size_t TunDevice::poll_packet(char* read_buffer, size_t buf_size, int timeout) {
size_t TunDevice::read(char* read_buffer, size_t buf_size) {
int nread = ::read(_fd, read_buffer, buf_size);
if(nread < 0) {
throw TunDevice::NetError(
"Error reading from interface", errno, true);
perror("Tun device: error reading from interface: ");
exit(1);
}
_last_read_size = nread;
return _last_read_size;
@ -126,8 +128,8 @@ size_t TunDevice::read(char* read_buffer, size_t buf_size) {
size_t TunDevice::write(const char* data, size_t len) {
int nwritten = ::write(_fd, data, len);
if(nwritten < 0) {
throw TunDevice::NetError(
"Error writing to interface: ", errno, true);
perror("Tun device: error writing to interface: ");
exit(1);
}
return nwritten;
}

17
TunDevice.hpp
View file

@ -6,23 +6,6 @@
class TunDevice {
public:
class InitializationError : public MsgException {
public:
InitializationError(
const std::string& msg,
int code=0,
bool is_perror=false)
: MsgException(msg, code, is_perror) {}
};
class NetError : public MsgException {
public:
NetError(
const std::string& msg,
int code=0,
bool is_perror=false)
: MsgException(msg, code, is_perror) {}
};
TunDevice(const std::string& dev);
~TunDevice();

16
UdpVpn.cpp
View file

@ -24,8 +24,10 @@ UdpVpn::UdpVpn()
_tun_dev.set_mtu(VpnPacket::get_tunnelled_mtu(_vpn_mtu));
_socket = socket(AF_INET6, SOCK_DGRAM, 0);
if(_socket < 0)
throw UdpVpn::InitializationError("Cannot create socket", errno, true);
if(_socket < 0) {
perror("UdpVpn: cannot create socket: ");
exit(1);
}
}
UdpVpn::~UdpVpn() {
@ -58,8 +60,8 @@ void UdpVpn::run() {
if(rc < 0) {
if(errno == EINTR) // Interrupt.
continue;
throw UdpVpn::NetError(
"Error polling from interface", errno, true);
perror("UdpVpn: error polling from interface: ");
exit(1);
}
// ## Check periodic actions
@ -124,8 +126,10 @@ size_t UdpVpn::read_from_udp(char* buffer, size_t len,
nread = recvfrom(_socket, buffer, len, 0,
(struct sockaddr*) &peer_addr, &peer_addr_len);
if(nread < 0)
throw UdpVpn::NetError("Cannot receive datagram", errno, true);
if(nread < 0) {
perror("UdpVpn: cannot receive datagram: ");
exit(1);
}
if(nread == 0)
return 0;

17
UdpVpn.hpp
View file

@ -13,23 +13,6 @@
class UdpVpn {
public:
class InitializationError : public MsgException {
public:
InitializationError(
const std::string& msg,
int code=0,
bool is_perror=false)
: MsgException(msg, code, is_perror) {}
};
class NetError : public MsgException {
public:
NetError(
const std::string& msg,
int code=0,
bool is_perror=false)
: MsgException(msg, code, is_perror) {}
};
UdpVpn();
virtual ~UdpVpn();

3
UdpVpnServer.cpp
View file

@ -51,7 +51,8 @@ void UdpVpnServer::bind(const struct in6_addr& bind_addr6, in_port_t port) {
rc = ::bind(
_socket, (const struct sockaddr*)&_bind_addr, sizeof(_bind_addr));
if(rc < 0) {
throw UdpVpn::InitializationError("Cannot bind socket", errno, true);
perror("UdpVpn: cannot bind socket: ");
exit(1);
}
debugf("> Listening on port %d\n", port);

6
VpnPacket.cpp
View file

@ -79,8 +79,10 @@ void VpnPacket::upon_reception() {
}
uint32_t VpnPacket::next_seqno() {
if(!_peer)
throw PeerNotSet();
if(!_peer) {
fprintf(stderr, "ERROR: trying to get seqno without peer.\n");
return 0;
}
return _peer->next_seqno();
}

2
VpnPacket.hpp
View file

@ -3,7 +3,6 @@
/** A packet to be transmitted or received over the VPN socket */
#include <stdlib.h>
#include <exception>
#include "ip_header.hpp"
@ -50,7 +49,6 @@ class VpnPacketTLV;
class VpnPacket {
public:
static const size_t VPN_HEADER_BYTES;
class PeerNotSet: public std::exception {};
VpnPacket(size_t mtu, bool inbound);
~VpnPacket();

6
VpnPeer.cpp
View file

@ -69,8 +69,10 @@ size_t VpnPeer::write(const char* data, size_t len) {
nsent = sendto(_vpn->get_socket_fd(), data, len, MSG_CONFIRM,
(const struct sockaddr*) &_ext_addr, sizeof(_ext_addr));
if(nsent < 0)
throw NetError("Could not send UDP packet", errno, true);
if(nsent < 0) {
perror("Could not send UDP packet: ");
exit(1);
}
_tot_bytes_sent += nsent;

9
VpnPeer.hpp
View file

@ -68,15 +68,6 @@ class RTTLogger {
class VpnPeer {
public:
class NetError : public MsgException {
public:
NetError(
const std::string& msg,
int code=0,
bool is_perror=false)
: MsgException(msg, code, is_perror) {}
};
/// Logs the loss reports sent by the remote peer
struct LossReports {
uint32_t prev_seqno, last_seqno;

11
main.cpp
View file

@ -100,7 +100,6 @@ int main(int argc, char** argv) {
signal(SIGINT, stop_sig_handler);
signal(SIGUSR1, dump_sig_handler);
try {
if(program_options.listen && program_options.has_peer) {
fprintf(stderr,
"ERROR: Cannot be a server and a client at the same time "
@ -137,15 +136,5 @@ int main(int argc, char** argv) {
delete vpn_instance;
printf("Shutting down.\n");
} catch(const TunDevice::InitializationError& exn) {
fprintf(stderr, "TUN INIT ERROR: %s\n", exn.what());
} catch(const TunDevice::NetError& exn) {
fprintf(stderr, "TUN NET ERROR: %s\n", exn.what());
} catch(const UdpVpn::InitializationError& exn) {
fprintf(stderr, "VPN INIT ERROR: %s\n", exn.what());
} catch(const UdpVpn::NetError& exn) {
fprintf(stderr, "VPN NET ERROR: %s\n", exn.what());
}
return 0;
}

17
util.cpp
View file

@ -109,20 +109,3 @@ bool equal_to<in6_addr>::operator()(
return memcmp(lhs.s6_addr, rhs.s6_addr, sizeof(lhs.s6_addr)) == 0;
}
}
MsgException::MsgException(const std::string& msg, int code, bool is_perror)
: _msg(msg), _code(code)
{
_what = _msg;
if(_code != 0) {
if(is_perror) {
_what += ": ";
_what += strerror(errno);
}
char remainder[20];
sprintf(remainder, " (code %d)", _code);
_what += remainder;
}
}

20
util.hpp
View file

@ -1,6 +1,5 @@
#pragma once
#include <exception>
#include <string>
#include <netinet/in.h>
@ -96,22 +95,3 @@ namespace std {
bool operator()(const in6_addr& lhs, const in6_addr& rhs) const;
};
}
/** MsgException -- an exception bearing a passed explanation message
*
* If `is_perror` is true, then the `strerror` corresponding message is appened
* to the message in `what()`.
*/
class MsgException : public std::exception {
public:
MsgException(const std::string& msg, int code=0, bool is_perror=false);
int errcode() const noexcept { return _code; }
const char* what() const noexcept { return _what.c_str(); };
private:
std::string _msg;
int _code;
std::string _what;
};