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/*
* These are socket routines for the main module of CNTLM
*
* CNTLM is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* CNTLM is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
* St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (c) 2007 David Kubicek
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <netdb.h>
#include <syslog.h>
#include "utils.h"
extern int debug;
/*
* gethostbyname() wrapper. Return 1 if OK, otherwise 0.
*/
int so_resolv(struct in_addr *host, const char *name) {
/*
struct hostent *resolv;
resolv = gethostbyname(name);
if (!resolv)
return 0;
memcpy(host, resolv->h_addr_list[0], resolv->h_length);
return 1;
*/
struct addrinfo hints, *res, *p;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
int rc = getaddrinfo(name, NULL, &hints, &res);
if (rc != 0) {
if (debug)
printf("so_resolv: %s failed: %s (%d)\n", name, gai_strerror(rc), rc);
return 0;
}
if (debug)
printf("Resolve %s:\n", name);
int addr_set = 0;
for (p = res; p != NULL; p = p->ai_next) {
struct sockaddr_in *ad = (struct sockaddr_in*)(p->ai_addr);
if (ad == NULL) {
freeaddrinfo(res);
return 0;
}
if (!addr_set) {
memcpy(host, &ad->sin_addr, sizeof(ad->sin_addr));
addr_set = 1;
if (debug)
printf(" -> %s\n", inet_ntoa(ad->sin_addr));
} else
if (debug)
printf(" %s\n", inet_ntoa(ad->sin_addr));
}
freeaddrinfo(res);
return 1;
}
/*
* Connect to a host. Host is required to be resolved
* in the struct in_addr already.
* Returns: socket descriptor
*/
int so_connect(struct in_addr host, int port) {
int flags, fd, rc;
struct sockaddr_in saddr;
// struct timeval tv;
// fd_set fds;
if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
if (debug)
printf("so_connect: create: %s\n", strerror(errno));
return -1;
}
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(port);
saddr.sin_addr = host;
if ((flags = fcntl(fd, F_GETFL, 0)) < 0) {
if (debug)
printf("so_connect: get flags: %s\n", strerror(errno));
close(fd);
return -1;
}
/* NON-BLOCKING connect with timeout
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0) {
if (debug)
printf("so_connect: set non-blocking: %s\n", strerror(errno));
close(fd);
return -1;
}
*/
rc = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
/*
printf("connect = %d\n", rc);
if (rc < 0 && (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINPROGRESS)) {
FD_ZERO(&fds);
FD_SET(fd, &fds);
tv.tv_sec = 10;
tv.tv_usec = 0;
printf("select!\n");
rc = select(fd+1, NULL, &fds, NULL, &tv) - 1;
printf("select = %d\n", rc);
}
*/
if (rc < 0) {
if (debug)
printf("so_connect: %s\n", strerror(errno));
close(fd);
return -1;
}
if (fcntl(fd, F_SETFL, flags & ~O_NONBLOCK) < 0) {
if (debug)
printf("so_connect: set blocking: %s\n", strerror(errno));
close(fd);
return -1;
}
return fd;
}
/*
* Bind the specified port and listen on it.
* Return socket descriptor if OK, otherwise 0.
*/
int so_listen(int port, struct in_addr source) {
struct sockaddr_in saddr;
int fd;
socklen_t clen;
fd = socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0) {
if (debug)
printf("so_listen: new socket: %s\n", strerror(errno));
close(fd);
return -1;
}
clen = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &clen, sizeof(clen));
memset((void *)&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(port);
saddr.sin_addr.s_addr = source.s_addr;
if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr))) {
syslog(LOG_ERR, "Cannot bind port %d: %s!\n", port, strerror(errno));
close(fd);
return -1;
}
if (listen(fd, 5)) {
close(fd);
return -1;
}
return fd;
}
/*
* Return 1 if data is available on the socket,
* 0 if connection was closed
* -1 if error (errno is set)
*/
int so_recvtest(int fd) {
char buf;
int i;
#ifndef MSG_DONTWAIT
unsigned int flags;
flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
i = recv(fd, &buf, 1, MSG_PEEK);
fcntl(fd, F_SETFL, flags);
#else
i = recv(fd, &buf, 1, MSG_DONTWAIT | MSG_PEEK);
#endif
return i;
}
/*
* Return true if there are some data on the socket
*/
int so_dataready(int fd) {
return so_recvtest(fd) > 0;
}
/*
* Reliable way of finding out whether a connection was closed
* on the remote end, without actually reading from it.
*/
int so_closed(int fd) {
int i;
if (fd == -1)
return 1;
i = so_recvtest(fd);
return (i == 0 || (i == -1 && errno != EAGAIN && errno != ENOENT)); /* ENOENT, you ask? Perhap AIX devels could explain! :-( */
}
/*
* Receive a single line from the socket. This is no super-efficient
* implementation, but more than we need to read in a few headers.
* What's more, the data is actually recv'd from a socket buffer.
*
* I had to time this in comparison to recv with block read :) and
* the performance was very similar. Given the fact that it keeps us
* from creating a whole buffering scheme around the socket (HTTP
* connection is both line and block oriented, switching back and forth),
* it is actually OK.
*/
int so_recvln(int fd, char **buf, int *size) {
int len = 0;
int r = 1;
char c = 0;
char *tmp;
while (len < *size-1 && c != '\n') {
r = read(fd, &c, 1);
if (r <= 0)
break;
(*buf)[len++] = c;
/*
* End of buffer, still no EOL? Resize the buffer
*/
if (len == *size-1 && c != '\n') {
if (debug)
printf("so_recvln(%d): realloc %d\n", fd, *size*2);
*size *= 2;
tmp = realloc(*buf, *size);
if (tmp == NULL)
return -1;
else
*buf = tmp;
}
}
(*buf)[len] = 0;
return r;
}
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