mirror of
https://github.com/yarrick/iodine.git
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172 lines
3.4 KiB
C
172 lines
3.4 KiB
C
/* Copyright (c) 2006-2007 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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* Copyright (c) 2007 Albert Lee <trisk@acm.jhu.edu>.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <netinet/in.h>
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#ifdef DARWIN
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#include <arpa/nameser8_compat.h>
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#endif
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#include <time.h>
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#include <err.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <termios.h>
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#include "common.h"
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/* daemon(3) exists only in 4.4BSD or later, and in GNU libc */
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#if !(defined(BSD) && (BSD >= 199306)) && !defined(__GLIBC__)
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static int daemon(int nochdir, int noclose)
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{
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int fd, i;
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switch (fork()) {
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case 0:
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break;
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case -1:
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return -1;
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default:
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_exit(0);
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}
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if (!nochdir) {
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chdir("/");
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}
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if (setsid() < 0) {
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return -1;
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}
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if (!noclose) {
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if ((fd = open("/dev/null", O_RDWR)) >= 0) {
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for (i = 0; i < 3; i++) {
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dup2(fd, i);
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}
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if (fd > 2) {
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close(fd);
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}
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}
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}
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return 0;
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}
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#endif
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int
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open_dns(int localport, in_addr_t listen_ip)
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{
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struct sockaddr_in addr;
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int flag;
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int fd;
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(localport);
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/* listen_ip already in network byte order from inet_addr, or 0 */
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addr.sin_addr.s_addr = listen_ip;
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if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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err(1, "socket");
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flag = 1;
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#ifdef SO_REUSEPORT
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setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &flag, sizeof(flag));
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#endif
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));
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if(bind(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0)
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err(1, "bind");
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printf("Opened UDP socket\n");
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return fd;
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}
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void
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close_dns(int fd)
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{
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close(fd);
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}
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void
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do_chroot(char *newroot)
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{
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if (chroot(newroot) != 0 || chdir("/") != 0)
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err(1, "%s", newroot);
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seteuid(geteuid());
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setuid(getuid());
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}
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void
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do_detach()
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{
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printf("Detaching from terminal...\n");
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daemon(0, 0);
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umask(0);
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alarm(0);
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}
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void
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read_password(char *buf, size_t len)
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{
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struct termios old;
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struct termios tp;
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char pwd[80];
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tcgetattr(0, &tp);
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old = tp;
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tp.c_lflag &= (~ECHO);
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tcsetattr(0, TCSANOW, &tp);
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printf("Enter password: ");
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fflush(stdout);
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scanf("%79s", pwd);
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printf("\n");
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tcsetattr(0, TCSANOW, &old);
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strncpy(buf, pwd, len);
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buf[len-1] = '\0';
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}
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int
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check_topdomain(char *str)
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{
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int i;
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if(str[0] == '.') /* special case */
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return 1;
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for( i = 0; i < strlen(str); i++) {
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if( isalpha(str[i]) || isdigit(str[i]) || str[i] == '-' || str[i] == '.' )
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continue;
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else
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return 1;
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}
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return 0;
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}
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