diff options
Diffstat (limited to 'kio/misc/kpac/kpac_dhcp_helper.c')
-rw-r--r-- | kio/misc/kpac/kpac_dhcp_helper.c | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/kio/misc/kpac/kpac_dhcp_helper.c b/kio/misc/kpac/kpac_dhcp_helper.c deleted file mode 100644 index 906e89dfa..000000000 --- a/kio/misc/kpac/kpac_dhcp_helper.c +++ /dev/null @@ -1,229 +0,0 @@ -/* This file is part of the KDE Libraries - Copyright (c) 2001 Malte Starostik <malte@kde.org> - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public - License version 2 as published by the Free Software Foundation. - - This library 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 - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public License - along with this library; see the file COPYING.LIB. If not, write to - the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, - Boston, MA 02110-1301, USA. -*/ - - -#include <config.h> -#include <sys/types.h> -#include <grp.h> - -#include <unistd.h> -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <sys/time.h> -#include <sys/socket.h> -#include <time.h> -#include <netdb.h> -#include <netinet/in.h> - -#include "dhcp.h" - -#ifndef INADDR_NONE /* some OSes don't define this */ -#define INADDR_NONE -1 -#endif - -int set_gid(gid_t); -int set_uid(uid_t); -int get_port(const char *); -int init_socket(void); -uint32_t send_request(int); -void get_reply(int, uint32_t); - -int set_gid(gid_t gid) -{ -#ifdef HAVE_SHORTSETGROUPS - short x[2]; - x[0] = gid; - x[1] = 73; /* catch errors */ - if (setgroups(1, x) == -1) - return -1; -#else - if (setgroups(1, &gid) == -1) - return -1; -#endif - return setgid(gid); /* _should_ be redundant, but on some systems it isn't */ -} - -int set_uid(uid_t uid) -{ - return setuid(uid); -} - -/* All functions below do an exit(1) on the slightest error */ - -/* Returns the UDP port number for the given service name */ -int get_port(const char *service) -{ - struct servent *serv = getservbyname(service, "udp"); - if (serv == NULL) - exit(1); - - return serv->s_port; -} - -/* Opens the UDP socket, binds to the bootpc port and drops root privileges */ -int init_socket() -{ - struct sockaddr_in addr; - struct protoent *proto; - int sock; - int bcast = 1; - - memset(&addr, 0, sizeof(addr)); - addr.sin_family = AF_INET; - addr.sin_addr.s_addr = INADDR_ANY; - addr.sin_port = get_port("bootpc"); - - if ((proto = getprotobyname("udp")) == NULL || - (sock = socket(AF_INET, SOCK_DGRAM, proto->p_proto)) == -1) - exit(1); - - if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &bcast, sizeof(bcast)) == -1 || - setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &bcast, sizeof(bcast)) == -1 || - bind(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) - exit(1); - - if (set_gid(getgid()) != 0 || /* we don't need it anymore */ - set_uid(getuid()) != 0) - exit(1); - return sock; -} - -/* Fills the DHCPINFORM request packet, returns the transaction id */ -uint32_t send_request(int sock) -{ - char hostname[256]; - struct hostent *hent; - struct sockaddr_in addr; - struct dhcp_msg request; - uint8_t *offs = request.options; - - hostname[0] = '\0'; - hostname[255] = '\0'; - if (gethostname(hostname, 255) == -1 || - strlen(hostname) == 0 || - (hent = gethostbyname(hostname)) == NULL) - exit(1); - - memset(&addr, 0, sizeof(addr)); - addr.sin_family = AF_INET; - addr.sin_addr.s_addr = INADDR_NONE; - addr.sin_port = get_port("bootps"); - - memset(&request, 0, sizeof(request)); - request.op = DHCP_BOOTREQUEST; - srand(time(NULL)); - request.xid = rand(); - request.ciaddr = *(uint32_t*)*hent->h_addr_list; - - *offs++ = DHCP_MAGIC1; - *offs++ = DHCP_MAGIC2; - *offs++ = DHCP_MAGIC3; - *offs++ = DHCP_MAGIC4; - - *offs++ = DHCP_OPT_MSGTYPE; - *offs++ = 1; /* length */ - *offs++ = DHCP_INFORM; - - *offs++ = DHCP_OPT_PARAMREQ; - *offs++ = 1; /* length */ - *offs++ = DHCP_OPT_WPAD; - - *offs++ = DHCP_OPT_END; - - if (sendto(sock, &request, sizeof(request), 0, - (struct sockaddr *)&addr, sizeof(addr)) != sizeof(request)) - exit(1); - - return request.xid; -} - -/* Reads the reply from the socket, checks it and outputs the URL to STDOUT */ -void get_reply(int sock, uint32_t xid) -{ - struct dhcp_msg reply; - int len; - char wpad[DHCP_OPT_LEN + 1]; - uint8_t wpad_len; - uint8_t *offs = reply.options; - uint8_t *end; - - if ((len = recvfrom(sock, &reply, sizeof(reply), 0, NULL, NULL)) <= 0) - exit(1); - - end = (uint8_t *)&reply + len; - if (end < offs + 4 || - end > &reply.options[DHCP_OPT_LEN] || - reply.op != DHCP_BOOTREPLY || - reply.xid != xid || - *offs++ != DHCP_MAGIC1 || - *offs++ != DHCP_MAGIC2 || - *offs++ != DHCP_MAGIC3 || - *offs++ != DHCP_MAGIC4) - exit(1); - - for ( ; offs < end - 1; offs += *offs+1) - { - switch (*offs++) - { - case DHCP_OPT_END: - exit(1); - case DHCP_OPT_MSGTYPE: - if (*offs != 1 || (offs >= end - 1) || *(offs + 1) != DHCP_ACK) - exit(1); - break; - case DHCP_OPT_WPAD: - memset(wpad, 0, sizeof(wpad)); - wpad_len = *offs++; - if (offs >= end) - exit(1); - if (wpad_len > end - offs) - wpad_len = end - offs; - strncpy(wpad, (char *)offs, wpad_len); - wpad[wpad_len] = 0; - printf("%s\n", wpad); - close(sock); - exit(0); - } - } - exit(1); -} - -int main() -{ - fd_set rfds; - struct timeval tv; - int sock; - uint32_t xid; - - sock = init_socket(); - xid = send_request(sock); - - FD_ZERO(&rfds); - FD_SET(sock, &rfds); - tv.tv_sec = 5; - tv.tv_usec = 0; - if (select(sock + 1, &rfds, NULL, NULL, &tv) == 1 && FD_ISSET(sock, &rfds)) - get_reply(sock, xid); - - close(sock); - exit(1); -} - -/* vim: ts=4 sw=4 noet - */ |