source: branches/stable/mindi-busybox/networking/udhcp/clientpacket.c @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 13 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 6.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* clientpacket.c
3 *
4 * Packet generation and dispatching functions for the DHCP client.
5 *
6 * Russ Dill <Russ.Dill@asu.edu> July 2001
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9 */
10
11#include <features.h>
12#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
13#include <netpacket/packet.h>
14#include <net/ethernet.h>
15#else
16#include <asm/types.h>
17#include <linux/if_packet.h>
18#include <linux/if_ether.h>
19#endif
20
21#include "common.h"
22#include "dhcpd.h"
23#include "dhcpc.h"
24#include "options.h"
25
26
27/* Create a random xid */
28uint32_t random_xid(void)
29{
30    static smallint initialized;
31
32    if (!initialized) {
33        srand(monotonic_us());
34        initialized = 1;
35    }
36    return rand();
37}
38
39
40/* initialize a packet with the proper defaults */
41static void init_packet(struct dhcpMessage *packet, char type)
42{
43    udhcp_init_header(packet, type);
44    memcpy(packet->chaddr, client_config.arp, 6);
45    if (client_config.clientid)
46        add_option_string(packet->options, client_config.clientid);
47    if (client_config.hostname)
48        add_option_string(packet->options, client_config.hostname);
49    if (client_config.fqdn)
50        add_option_string(packet->options, client_config.fqdn);
51    add_option_string(packet->options, client_config.vendorclass);
52}
53
54
55/* Add a parameter request list for stubborn DHCP servers. Pull the data
56 * from the struct in options.c. Don't do bounds checking here because it
57 * goes towards the head of the packet. */
58static void add_requests(struct dhcpMessage *packet)
59{
60    int end = end_option(packet->options);
61    int i, len = 0;
62
63    packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
64    for (i = 0; dhcp_options[i].code; i++)
65        if (dhcp_options[i].flags & OPTION_REQ)
66            packet->options[end + OPT_DATA + len++] = dhcp_options[i].code;
67    packet->options[end + OPT_LEN] = len;
68    packet->options[end + OPT_DATA + len] = DHCP_END;
69
70}
71
72
73/* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
74int send_discover(uint32_t xid, uint32_t requested)
75{
76    struct dhcpMessage packet;
77
78    init_packet(&packet, DHCPDISCOVER);
79    packet.xid = xid;
80    if (requested)
81        add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
82
83    add_requests(&packet);
84    bb_info_msg("Sending discover...");
85    return udhcp_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
86            SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
87}
88
89
90/* Broadcasts a DHCP request message */
91int send_selecting(uint32_t xid, uint32_t server, uint32_t requested)
92{
93    struct dhcpMessage packet;
94    struct in_addr addr;
95
96    init_packet(&packet, DHCPREQUEST);
97    packet.xid = xid;
98
99    add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
100    add_simple_option(packet.options, DHCP_SERVER_ID, server);
101
102    add_requests(&packet);
103    addr.s_addr = requested;
104    bb_info_msg("Sending select for %s...", inet_ntoa(addr));
105    return udhcp_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
106                SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
107}
108
109
110/* Unicasts or broadcasts a DHCP renew message */
111int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
112{
113    struct dhcpMessage packet;
114
115    init_packet(&packet, DHCPREQUEST);
116    packet.xid = xid;
117    packet.ciaddr = ciaddr;
118
119    add_requests(&packet);
120    bb_info_msg("Sending renew...");
121    if (server)
122        return udhcp_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
123
124    return udhcp_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
125                SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
126}
127
128
129/* Unicasts a DHCP release message */
130int send_release(uint32_t server, uint32_t ciaddr)
131{
132    struct dhcpMessage packet;
133
134    init_packet(&packet, DHCPRELEASE);
135    packet.xid = random_xid();
136    packet.ciaddr = ciaddr;
137
138    add_simple_option(packet.options, DHCP_REQUESTED_IP, ciaddr);
139    add_simple_option(packet.options, DHCP_SERVER_ID, server);
140
141    bb_info_msg("Sending release...");
142    return udhcp_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
143}
144
145
146/* return -1 on errors that are fatal for the socket, -2 for those that aren't */
147int get_raw_packet(struct dhcpMessage *payload, int fd)
148{
149    int bytes;
150    struct udp_dhcp_packet packet;
151    uint32_t source, dest;
152    uint16_t check;
153
154    memset(&packet, 0, sizeof(struct udp_dhcp_packet));
155    bytes = read(fd, &packet, sizeof(struct udp_dhcp_packet));
156    if (bytes < 0) {
157        DEBUG("Cannot read on raw listening socket - ignoring");
158        usleep(500000); /* possible down interface, looping condition */
159        return -1;
160    }
161
162    if (bytes < (int) (sizeof(struct iphdr) + sizeof(struct udphdr))) {
163        DEBUG("Message too short, ignoring");
164        return -2;
165    }
166
167    if (bytes < ntohs(packet.ip.tot_len)) {
168        DEBUG("Truncated packet");
169        return -2;
170    }
171
172    /* ignore any extra garbage bytes */
173    bytes = ntohs(packet.ip.tot_len);
174
175    /* Make sure its the right packet for us, and that it passes sanity checks */
176    if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION
177     || packet.ip.ihl != sizeof(packet.ip) >> 2
178     || packet.udp.dest != htons(CLIENT_PORT)
179     || bytes > (int) sizeof(struct udp_dhcp_packet)
180     || ntohs(packet.udp.len) != (uint16_t)(bytes - sizeof(packet.ip))
181    ) {
182        DEBUG("Unrelated/bogus packet");
183        return -2;
184    }
185
186    /* check IP checksum */
187    check = packet.ip.check;
188    packet.ip.check = 0;
189    if (check != udhcp_checksum(&(packet.ip), sizeof(packet.ip))) {
190        DEBUG("bad IP header checksum, ignoring");
191        return -1;
192    }
193
194    /* verify the UDP checksum by replacing the header with a psuedo header */
195    source = packet.ip.saddr;
196    dest = packet.ip.daddr;
197    check = packet.udp.check;
198    packet.udp.check = 0;
199    memset(&packet.ip, 0, sizeof(packet.ip));
200
201    packet.ip.protocol = IPPROTO_UDP;
202    packet.ip.saddr = source;
203    packet.ip.daddr = dest;
204    packet.ip.tot_len = packet.udp.len; /* cheat on the psuedo-header */
205    if (check && check != udhcp_checksum(&packet, bytes)) {
206        bb_error_msg("packet with bad UDP checksum received, ignoring");
207        return -2;
208    }
209
210    memcpy(payload, &(packet.data), bytes - (sizeof(packet.ip) + sizeof(packet.udp)));
211
212    if (ntohl(payload->cookie) != DHCP_MAGIC) {
213        bb_error_msg("received bogus message (bad magic) - ignoring");
214        return -2;
215    }
216    DEBUG("oooooh!!! got some!");
217    return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
218}
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