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net.c
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net.c
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#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include "runtime.h"
static int bind0(int, const char *, unsigned short);
static int bindunix(int, const char *);
static int connect0(int, const char *, unsigned short);
static int connectunix(int, const char *);
void setcloexec(int fd) {}
void setnonblock(int fd) {
int n;
n = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
if (n < 0)
throw("setnonblock: fcntl failed with errno %d", errno);
}
int listen0(int type, const char *host, unsigned short port) {
int fd, n;
fd = bind0(type, host, port);
if (fd < 0)
throw("listen0: bind0 failed with %d", fd);
if (type != SOCK_STREAM)
return fd;
n = listen(fd, 128);
if (n < 0)
throw("listen0: listen failed with errno %d", errno);
return fd;
}
int dial0(int type, const char *host, unsigned short port) {
int fd;
fd = connect0(type, host, port);
if (fd < 0)
throw("dial0: connect0 failed with errno %d", errno);
return fd;
}
int listenunix0(int type, const char *path) {
int fd, n;
fd = bindunix(type, path);
if (fd < 0)
throw("listenunix0: bind0 failed with %d", fd);
if (type != SOCK_STREAM)
return fd;
n = listen(fd, 128);
if (n < 0)
throw("listenunix0: listen failed with errno %d", errno);
return fd;
}
int dialunix0(int net, const char *path) {
int fd;
fd = connectunix(SOCK_STREAM, path);
if (fd < 0)
throw("dialunix0: connectunix failed with errno %d", errno);
return fd;
}
static int isv6(const char *p) {
for (; *p; p++)
if (*p == ':')
return 1;
return 0;
}
static int bind0(int type, const char *host, unsigned short port) {
struct addrinfo hint, *ap;
char b[6];
int n, fd = -1;
snprintf(b, 6, "%u", port);
memset(&hint, 0, sizeof hint);
hint.ai_family = isv6(host) ? AF_INET6 : AF_INET;
hint.ai_socktype = type;
hint.ai_flags = AI_PASSIVE;
n = getaddrinfo(host, b, &hint, &ap);
if (n < 0)
throw("bind0: getaddrinfo failed with %d", n);
for (; ap; ap = ap->ai_next) {
fd = socket(ap->ai_family, ap->ai_socktype, ap->ai_protocol);
if (fd < 0)
continue;
n = bind(fd, ap->ai_addr, ap->ai_addrlen);
if (n < 0)
continue;
break;
}
freeaddrinfo(ap);
return fd;
}
int connect0(int type, const char *host, unsigned short port) {
struct addrinfo hint, *ap;
char b[6];
int n, fd;
snprintf(b, 6, "%u", port);
memset(&hint, 0, sizeof hint);
hint.ai_family = isv6(host) ? AF_INET6 : AF_INET;
hint.ai_socktype = type;
hint.ai_flags = AI_PASSIVE;
n = getaddrinfo(host, b, &hint, &ap);
if (n < 0)
throw("connect0: getaddrinfo failed with %d", n);
fd = socket(hint.ai_family, type, 0);
if (fd < 0)
throw("connect0: socket failed with errno %d", errno);
for (; ap; ap = ap->ai_next) {
n = connect(fd, ap->ai_addr, ap->ai_addrlen);
if (n < 0)
continue;
break;
}
freeaddrinfo(ap);
return fd;
}
static int bindunix(int type, const char *path) {
struct sockaddr_un sa;
int fd, n;
memset(&sa, 0, sizeof sa);
strncpy(sa.sun_path, path, sizeof(sa.sun_path) - 1);
sa.sun_family = AF_UNIX;
fd = socket(sa.sun_family, type, 0);
if (fd < 0)
throw("bindunix: socket failed with errno %d", errno);
n = bind(fd, (struct sockaddr *)&sa, sizeof sa);
if (n < 0)
throw("bindunix: bind failed with errno %d", errno);
return fd;
}
static int connectunix(int type, const char *path) {
struct sockaddr_un sa;
int fd, n;
memset(&sa, 0, sizeof sa);
strncpy(sa.sun_path, path, sizeof(sa.sun_path) - 1);
sa.sun_family = AF_UNIX;
fd = socket(sa.sun_family, type, 0);
if (fd < 0)
throw("bindunix: socket failed with errno %d", errno);
n = connect(fd, (struct sockaddr *)&sa, sizeof sa);
if (n < 0)
throw("bindunix: connect failed with errno %d", errno);
return fd;
}