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linux.c
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282 lines (254 loc) · 6.67 KB
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/*
* PseudoNode
* Copyright (c) 2015 the copyright holders
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
// Linux cruft:
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pwd.h>
#include <pthread.h>
#ifdef MACOSX
#define s6_addr16 __u6_addr.__u6_addr16
#define MSG_NOSIGNAL 0
#define MAP_ANONYMOUS MAP_ANON
#endif
#define get_error() strerror(errno)
static bool system_init(void)
{
return true;
}
static bool rand_init(uint64_t *r)
{
FILE *stream = fopen("/dev/urandom", "r");
if (stream == NULL)
return false;
bool ok = (fread(r, sizeof(uint64_t), 2, stream) == 2);
fclose(stream);
return ok;
}
typedef pthread_mutex_t mutex;
static inline void mutex_init(mutex *m)
{
int res = pthread_mutex_init(m, NULL);
assert(res == 0);
}
static inline void mutex_free(mutex *m)
{
int res = pthread_mutex_destroy(m);
assert(res == 0);
}
static inline void mutex_lock(mutex *m)
{
int res = pthread_mutex_lock(m);
assert(res == 0);
}
static inline void mutex_unlock(mutex *m)
{
int res = pthread_mutex_unlock(m);
assert(res == 0);
}
static inline void msleep(size_t ms)
{
usleep(ms * 1000);
}
// Implementation of Windows-style events in pthreads:
struct event
{
pthread_mutex_t mutex;
pthread_cond_t cond;
bool set;
};
typedef struct event event;
static void event_init(event *e)
{
mutex_init(&e->mutex);
int res;
pthread_condattr_t attr;
pthread_condattr_init(&attr);
#ifndef MACOSX
res = pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
assert(res == 0);
#endif
res = pthread_cond_init(&e->cond, &attr);
assert(res == 0);
e->set = false;
}
static bool event_wait(event *e)
{
struct timespec ts;
#ifndef MACOSX
clock_gettime(CLOCK_MONOTONIC, &ts);
#else
struct timeval tv;
int res = gettimeofday(&tv, NULL);
assert(res == 0);
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = 1000 * tv.tv_usec;
#endif
ts.tv_sec += 2;
mutex_lock(&e->mutex);
while (!e->set)
{
int res = pthread_cond_timedwait(&e->cond, &e->mutex, &ts);
if (res == ETIMEDOUT)
{
mutex_unlock(&e->mutex);
return false;
}
}
e->set = false;
mutex_unlock(&e->mutex);
return true;
}
static void event_set(event *e)
{
mutex_lock(&e->mutex);
e->set = true;
mutex_unlock(&e->mutex);
int res = pthread_cond_signal(&e->cond);
assert(res == 0);
}
static inline void event_free(event *e)
{
mutex_free(&e->mutex);
int res = pthread_cond_destroy(&e->cond);
assert(res == 0);
}
static bool spawn_thread(void *(f)(void *), void *arg)
{
pthread_t thread;
int res = pthread_create(&thread, NULL, f, (void *)arg);
if (res != 0)
return false;
res = pthread_detach(thread);
assert(res == 0);
return true;
}
typedef int sock;
#define INVALID_SOCKET (-1)
static sock socket_open(void)
{
sock s = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
if (s < 0)
return INVALID_SOCKET;
int on = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *)&on, sizeof(on));
struct timeval tv;
tv.tv_sec = 120; // 2 minutes
tv.tv_usec = 0;
setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, (char *)&tv, sizeof(tv));
return s;
}
static bool socket_bind(sock s, uint16_t port)
{
struct sockaddr_in6 sockaddr;
memset(&sockaddr, 0, sizeof(sockaddr));
sockaddr.sin6_family = AF_INET6;
sockaddr.sin6_port = port;
if (bind(s, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) != 0)
return false;
return true;
}
static bool socket_listen(sock s)
{
return (listen(s, 4) == 0);
}
static sock socket_accept(sock s, struct in6_addr *addr)
{
socklen_t len = sizeof(struct sockaddr_in6);
struct sockaddr_in6 sockaddr;
int s1 = accept(s, (struct sockaddr *)&sockaddr, &len);
if (s1 < 0)
return s1;
*addr = sockaddr.sin6_addr;
return s1;
}
static bool socket_connect(sock s, struct in6_addr addr, uint16_t port)
{
struct sockaddr_in6 sockaddr;
memset(&sockaddr, 0, sizeof(sockaddr));
sockaddr.sin6_family = AF_INET6;
sockaddr.sin6_port = port;
sockaddr.sin6_addr = addr;
int flags = fcntl(s, F_GETFL, 0);
if (flags < 0 || fcntl(s, F_SETFL, (flags | O_NONBLOCK)) != 0)
return false;
if (connect(s, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) < 0 &&
errno != EINPROGRESS)
return false;
if (fcntl(s, F_SETFL, flags) != 0)
return false;
struct timeval tv;
tv.tv_sec = 6;
tv.tv_usec = 0;
fd_set fds;
FD_ZERO(&fds);
FD_SET(s, &fds);
int r = select(s+1, NULL, &fds, NULL, &tv);
if (r == 0)
errno = ETIMEDOUT;
return (r > 0);
}
static ssize_t socket_recv(sock s, void *buf, size_t len, bool *timeout)
{
*timeout = false;
struct timeval tv;
tv.tv_sec = 2;
tv.tv_usec = 0;
fd_set fds;
FD_ZERO(&fds);
FD_SET(s, &fds);
int r = select(s+1, &fds, NULL, &fds, &tv);
if (r > 0)
return recv(s, buf, len, MSG_DONTWAIT);
if (r == 0)
{
*timeout = true;
return 0;
}
return -1;
}
static ssize_t socket_send(sock s, void *buf, size_t len)
{
for (size_t i = 0; i < len; )
{
int r = send(s, buf+i, len-i, MSG_NOSIGNAL);
if (r <= 0)
return r;
i += r;
}
return len;
}
static void socket_close(sock s, bool err)
{
if (!err)
shutdown(s, SHUT_RDWR);
close(s);
}