source: branches/stable/mindi-busybox/networking/udhcp/packet.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: 5.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2
3#include <netinet/in.h>
4#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
5#include <netpacket/packet.h>
6#include <net/ethernet.h>
7#else
8#include <asm/types.h>
9#include <linux/if_packet.h>
10#include <linux/if_ether.h>
11#endif
12
13#include "common.h"
14#include "dhcpd.h"
15#include "options.h"
16
17
18void udhcp_init_header(struct dhcpMessage *packet, char type)
19{
20    memset(packet, 0, sizeof(struct dhcpMessage));
21    switch (type) {
22    case DHCPDISCOVER:
23    case DHCPREQUEST:
24    case DHCPRELEASE:
25    case DHCPINFORM:
26        packet->op = BOOTREQUEST;
27        break;
28    case DHCPOFFER:
29    case DHCPACK:
30    case DHCPNAK:
31        packet->op = BOOTREPLY;
32    }
33    packet->htype = ETH_10MB;
34    packet->hlen = ETH_10MB_LEN;
35    packet->cookie = htonl(DHCP_MAGIC);
36    packet->options[0] = DHCP_END;
37    add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
38}
39
40
41/* read a packet from socket fd, return -1 on read error, -2 on packet error */
42int udhcp_get_packet(struct dhcpMessage *packet, int fd)
43{
44#if 0
45    static const char broken_vendors[][8] = {
46        "MSFT 98",
47        ""
48    };
49#endif
50    int bytes;
51    unsigned char *vendor;
52
53    memset(packet, 0, sizeof(*packet));
54    bytes = read(fd, packet, sizeof(*packet));
55    if (bytes < 0) {
56        DEBUG("cannot read on listening socket, ignoring");
57        return -1;
58    }
59
60    if (ntohl(packet->cookie) != DHCP_MAGIC) {
61        bb_error_msg("received bogus message, ignoring");
62        return -2;
63    }
64    DEBUG("Received a packet");
65
66    if (packet->op == BOOTREQUEST) {
67        vendor = get_option(packet, DHCP_VENDOR);
68        if (vendor) {
69#if 0
70            int i;
71            for (i = 0; broken_vendors[i][0]; i++) {
72                if (vendor[OPT_LEN - 2] == (uint8_t)strlen(broken_vendors[i])
73                 && !strncmp((char*)vendor, broken_vendors[i], vendor[OPT_LEN - 2])
74                ) {
75                    DEBUG("broken client (%s), forcing broadcast",
76                        broken_vendors[i]);
77                    packet->flags |= htons(BROADCAST_FLAG);
78                }
79            }
80#else
81            if (vendor[OPT_LEN - 2] == (uint8_t)(sizeof("MSFT 98")-1)
82             && memcmp(vendor, "MSFT 98", sizeof("MSFT 98")-1) == 0
83            ) {
84                DEBUG("broken client (%s), forcing broadcast", "MSFT 98");
85                packet->flags |= htons(BROADCAST_FLAG);
86            }
87#endif
88        }
89    }
90
91    return bytes;
92}
93
94
95uint16_t udhcp_checksum(void *addr, int count)
96{
97    /* Compute Internet Checksum for "count" bytes
98     *         beginning at location "addr".
99     */
100    int32_t sum = 0;
101    uint16_t *source = (uint16_t *) addr;
102
103    while (count > 1)  {
104        /*  This is the inner loop */
105        sum += *source++;
106        count -= 2;
107    }
108
109    /*  Add left-over byte, if any */
110    if (count > 0) {
111        /* Make sure that the left-over byte is added correctly both
112         * with little and big endian hosts */
113        uint16_t tmp = 0;
114        *(uint8_t *) (&tmp) = * (uint8_t *) source;
115        sum += tmp;
116    }
117    /*  Fold 32-bit sum to 16 bits */
118    while (sum >> 16)
119        sum = (sum & 0xffff) + (sum >> 16);
120
121    return ~sum;
122}
123
124
125/* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
126void BUG_sizeof_struct_udp_dhcp_packet_must_be_576(void);
127int udhcp_raw_packet(struct dhcpMessage *payload,
128        uint32_t source_ip, int source_port,
129        uint32_t dest_ip, int dest_port, const uint8_t *dest_arp, int ifindex)
130{
131    int fd;
132    int result;
133    struct sockaddr_ll dest;
134    struct udp_dhcp_packet packet;
135
136    fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
137    if (fd < 0) {
138        bb_perror_msg("socket");
139        return -1;
140    }
141
142    memset(&dest, 0, sizeof(dest));
143    memset(&packet, 0, sizeof(packet));
144
145    dest.sll_family = AF_PACKET;
146    dest.sll_protocol = htons(ETH_P_IP);
147    dest.sll_ifindex = ifindex;
148    dest.sll_halen = 6;
149    memcpy(dest.sll_addr, dest_arp, 6);
150    if (bind(fd, (struct sockaddr *)&dest, sizeof(struct sockaddr_ll)) < 0) {
151        bb_perror_msg("bind");
152        close(fd);
153        return -1;
154    }
155
156    packet.ip.protocol = IPPROTO_UDP;
157    packet.ip.saddr = source_ip;
158    packet.ip.daddr = dest_ip;
159    packet.udp.source = htons(source_port);
160    packet.udp.dest = htons(dest_port);
161    packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage)); /* cheat on the psuedo-header */
162    packet.ip.tot_len = packet.udp.len;
163    memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
164    packet.udp.check = udhcp_checksum(&packet, sizeof(struct udp_dhcp_packet));
165
166    packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
167    packet.ip.ihl = sizeof(packet.ip) >> 2;
168    packet.ip.version = IPVERSION;
169    packet.ip.ttl = IPDEFTTL;
170    packet.ip.check = udhcp_checksum(&(packet.ip), sizeof(packet.ip));
171
172    if (sizeof(struct udp_dhcp_packet) != 576)
173        BUG_sizeof_struct_udp_dhcp_packet_must_be_576();
174
175    result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0,
176            (struct sockaddr *) &dest, sizeof(dest));
177    if (result <= 0) {
178        bb_perror_msg("sendto");
179    }
180    close(fd);
181    return result;
182}
183
184
185/* Let the kernel do all the work for packet generation */
186int udhcp_kernel_packet(struct dhcpMessage *payload,
187        uint32_t source_ip, int source_port,
188        uint32_t dest_ip, int dest_port)
189{
190    int fd, result;
191    struct sockaddr_in client;
192
193    fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
194    if (fd < 0)
195        return -1;
196
197    setsockopt_reuseaddr(fd);
198
199    memset(&client, 0, sizeof(client));
200    client.sin_family = AF_INET;
201    client.sin_port = htons(source_port);
202    client.sin_addr.s_addr = source_ip;
203
204    if (bind(fd, (struct sockaddr *)&client, sizeof(client)) == -1) {
205        close(fd);
206        return -1;
207    }
208
209    memset(&client, 0, sizeof(client));
210    client.sin_family = AF_INET;
211    client.sin_port = htons(dest_port);
212    client.sin_addr.s_addr = dest_ip;
213
214    if (connect(fd, (struct sockaddr *)&client, sizeof(struct sockaddr)) == -1) {
215        close(fd);
216        return -1;
217    }
218
219    result = write(fd, payload, sizeof(struct dhcpMessage));
220    close(fd);
221    return result;
222}
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