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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <ctype.h>
#include <assert.h>
#include <errno.h>
#include "cmsys.h"
#define DEFAULT_TCP_QLEN (10)
uint32_t
ipstr2int(const char *ip)
{
unsigned int i;
uint32_t val = 0;
char buf[32];
char *nil, *p;
strlcpy(buf, ip, sizeof(buf));
p = buf;
for (i = 0; i < 4; i++) {
nil = strchr(p, '.');
if (nil != NULL)
*nil = 0;
val *= 256;
val += atoi(p);
if (nil != NULL)
p = nil + 1;
}
return val;
}
// addr format:
// xxx.xxx.xxx.xxx:port
// :port (bind to loopback)
// *:port (bind to addr_any, allow remote connect)
// all others formats are UNIX domain socket path.
int tobindex(const char *addr, int qlen, int (*_setsock)(int), int do_listen)
{
const int v_on = 1;
int sockfd;
assert(addr && *addr);
if (!isdigit(addr[0]) && addr[0] != ':' && addr[0] != '*') {
struct sockaddr_un servaddr;
if ( (sockfd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0 ) {
perror("socket()");
exit(1);
}
servaddr.sun_family = AF_UNIX;
strlcpy(servaddr.sun_path, addr, sizeof(servaddr.sun_path));
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
(void *)&v_on, sizeof(v_on));
if (_setsock)
_setsock(sockfd);
// remove the file first if it exists.
unlink(servaddr.sun_path);
if (bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
perror("bind()");
exit(1);
}
}
else {
char buf[64], *port;
struct sockaddr_in servaddr;
if ( (sockfd = socket(PF_INET, SOCK_STREAM, 0)) < 0 ) {
perror("socket()");
exit(1);
}
strlcpy(buf, addr, sizeof(buf));
if ( (port = strchr(buf, ':')) != NULL)
*port++ = '\0';
assert(port && atoi(port) != 0);
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
(void *)&v_on, sizeof(v_on));
if (_setsock)
_setsock(sockfd);
if (!buf[0])
servaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
else if (buf[0] == '*')
servaddr.sin_addr.s_addr = htonl(INADDR_ANY); // XXX use INADDR_LOOPBACK?
else if (inet_aton(buf, &servaddr.sin_addr) == 0) {
perror("inet_aton()");
exit(1);
}
servaddr.sin_port = htons(atoi(port));
servaddr.sin_family = AF_INET;
if( bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0 ) {
perror("bind()");
exit(1);
}
}
if (do_listen && listen(sockfd, qlen) < 0) {
perror("listen()");
exit(1);
}
return sockfd;
}
int tobind(const char * addr)
{
return tobindex(addr, DEFAULT_TCP_QLEN, NULL, 1);
}
int toconnect(const char *addr)
{
int sock;
assert(addr && *addr);
if (!isdigit(addr[0]) && addr[0] != ':' && addr[0] != '*') {
struct sockaddr_un serv_name;
if ( (sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0 ) {
perror("socket");
return -1;
}
serv_name.sun_family = AF_UNIX;
strlcpy(serv_name.sun_path, addr, sizeof(serv_name.sun_path));
if (connect(sock, (struct sockaddr *)&serv_name, sizeof(serv_name)) < 0) {
close(sock);
return -1;
}
}
else {
char buf[64], *port;
struct sockaddr_in serv_name;
if( (sock = socket(PF_INET, SOCK_STREAM, 0)) < 0 ){
perror("socket");
return -1;
}
strlcpy(buf, addr, sizeof(buf));
if ( (port = strchr(buf, ':')) != NULL)
*port++ = '\0';
assert(port && atoi(port) != 0);
if (!buf[0] || buf[0] == '*')
serv_name.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
else
serv_name.sin_addr.s_addr = inet_addr(buf);
serv_name.sin_port = htons(atoi(port));
serv_name.sin_family = AF_INET;
if( connect(sock, (struct sockaddr*)&serv_name, sizeof(serv_name)) < 0 ){
close(sock);
return -1;
}
}
return sock;
}
/**
* same as read(2), but read until exactly size len
*/
int toread(int fd, void *buf, int len)
{
int l;
for( l = 0 ; len > 0 ; )
if( (l = read(fd, buf, len)) <= 0 ) {
if (l < 0 && (errno == EINTR || errno == EAGAIN))
continue;
return l;
}else{
buf += l;
len -= l;
}
return l;
}
/**
* same as write(2), but write until exactly size len
*/
int towrite(int fd, const void *buf, int len)
{
int l;
for( l = 0 ; len > 0 ; )
if( (l = write(fd, buf, len)) <= 0){
if (l < 0 && (errno == EINTR || errno == EAGAIN))
continue;
return l;
}else{
buf += l;
len -= l;
}
return l;
}
/**
* fd sharing by piaip
*/
// return: -1 if error, otherwise success.
int send_remote_fd(int tunnel, int fd)
{
struct msghdr msg = {0};
struct iovec vec = {0};
struct cmsghdr *cmsg;
char ccmsg [CMSG_SPACE(sizeof(fd))];
char dummy = 0;
int rv;
vec.iov_base = &dummy; // must send/receive at least one byte
vec.iov_len = 1;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
msg.msg_control = ccmsg;
msg.msg_controllen = sizeof(ccmsg);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
*(int*)CMSG_DATA(cmsg) = fd;
// adjust msg again
msg.msg_controllen = cmsg->cmsg_len;
msg.msg_flags = 0;
do {
// ignore EINTR
rv = sendmsg(tunnel, &msg, 0);
} while (rv == -1 && errno == EINTR);
if (rv == -1) {
perror("sendmsg");
return rv;
}
return 0;
}
// return: remote fd (-1 if error)
int recv_remote_fd(int tunnel, const char *tunnel_path)
{
struct msghdr msg;
struct iovec iov;
char dummy;
int rv;
int connfd = -1;
char ccmsg[CMSG_SPACE(sizeof(connfd))];
struct cmsghdr *cmsg;
struct sockaddr_un sun = {0};
iov.iov_base = &dummy;
iov.iov_len = 1;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = ccmsg;
msg.msg_controllen = sizeof(ccmsg);
// XXX assigning msg_name here again is stupid,
// but seems like Linux need it (while FreeBSD does not...)
msg.msg_name = &sun;
msg.msg_namelen = sizeof(sun);
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, tunnel_path, sizeof(sun.sun_path));
do {
// ignore EINTR
rv = recvmsg(tunnel, &msg, 0);
} while (rv == -1 && errno == EINTR);
if (rv == -1) {
perror("recvmsg");
return -1;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (!cmsg) {
// kernel indicates there's no ancillary data
return -1;
}
assert(cmsg->cmsg_type == SCM_RIGHTS);
if (cmsg->cmsg_type != SCM_RIGHTS)
{
// invalid message!?
return -1;
}
return *(int*)CMSG_DATA(cmsg);
}
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