[821] | 1 | /* dhcpc.c
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| 2 | *
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| 3 | * udhcp DHCP client
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| 4 | *
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| 5 | * Russ Dill <Russ.Dill@asu.edu> July 2001
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| 6 | *
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| 7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 8 | */
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| 9 |
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| 10 | #include <sys/file.h>
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| 11 | #include <unistd.h>
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| 12 | #include <getopt.h>
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| 13 | #include <stdlib.h>
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| 14 | #include <sys/socket.h>
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| 15 | #include <netinet/in.h>
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| 16 | #include <arpa/inet.h>
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| 17 | #include <signal.h>
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| 18 | #include <time.h>
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| 19 | #include <string.h>
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| 20 | #include <sys/ioctl.h>
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| 21 | #include <net/if.h>
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| 22 | #include <errno.h>
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| 23 |
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| 24 | #include "common.h"
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| 25 | #include "dhcpd.h"
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| 26 | #include "dhcpc.h"
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| 27 | #include "options.h"
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| 28 | #include "clientpacket.h"
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| 29 | #include "clientsocket.h"
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| 30 | #include "socket.h"
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| 31 | #include "signalpipe.h"
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| 32 |
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| 33 | static int state;
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| 34 | static unsigned long requested_ip; /* = 0 */
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| 35 | static unsigned long server_addr;
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| 36 | static unsigned long timeout;
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| 37 | static int packet_num; /* = 0 */
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| 38 | static int fd = -1;
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| 39 |
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| 40 | #define LISTEN_NONE 0
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| 41 | #define LISTEN_KERNEL 1
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| 42 | #define LISTEN_RAW 2
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| 43 | static int listen_mode;
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| 44 |
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| 45 | struct client_config_t client_config = {
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| 46 | /* Default options. */
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| 47 | .abort_if_no_lease = 0,
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| 48 | .foreground = 0,
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| 49 | .quit_after_lease = 0,
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| 50 | .background_if_no_lease = 0,
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| 51 | .interface = "eth0",
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| 52 | .pidfile = NULL,
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| 53 | .script = DEFAULT_SCRIPT,
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| 54 | .clientid = NULL,
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| 55 | .vendorclass = NULL,
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| 56 | .hostname = NULL,
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| 57 | .fqdn = NULL,
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| 58 | .ifindex = 0,
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| 59 | .retries = 3,
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| 60 | .timeout = 3,
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| 61 | .arp = "\0\0\0\0\0\0", /* appease gcc-3.0 */
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| 62 | };
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| 63 |
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| 64 | /* just a little helper */
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| 65 | static void change_mode(int new_mode)
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| 66 | {
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| 67 | DEBUG(LOG_INFO, "entering %s listen mode",
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| 68 | new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
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| 69 | if (fd >= 0) close(fd);
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| 70 | fd = -1;
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| 71 | listen_mode = new_mode;
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| 72 | }
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| 73 |
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| 74 |
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| 75 | /* perform a renew */
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| 76 | static void perform_renew(void)
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| 77 | {
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| 78 | LOG(LOG_INFO, "Performing a DHCP renew");
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| 79 | switch (state) {
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| 80 | case BOUND:
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| 81 | change_mode(LISTEN_KERNEL);
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| 82 | case RENEWING:
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| 83 | case REBINDING:
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| 84 | state = RENEW_REQUESTED;
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| 85 | break;
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| 86 | case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
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| 87 | udhcp_run_script(NULL, "deconfig");
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| 88 | case REQUESTING:
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| 89 | case RELEASED:
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| 90 | change_mode(LISTEN_RAW);
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| 91 | state = INIT_SELECTING;
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| 92 | break;
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| 93 | case INIT_SELECTING:
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| 94 | break;
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| 95 | }
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| 96 |
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| 97 | /* start things over */
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| 98 | packet_num = 0;
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| 99 |
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| 100 | /* Kill any timeouts because the user wants this to hurry along */
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| 101 | timeout = 0;
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| 102 | }
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| 103 |
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| 104 |
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| 105 | /* perform a release */
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| 106 | static void perform_release(void)
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| 107 | {
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| 108 | char buffer[16];
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| 109 | struct in_addr temp_addr;
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| 110 |
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| 111 | /* send release packet */
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| 112 | if (state == BOUND || state == RENEWING || state == REBINDING) {
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| 113 | temp_addr.s_addr = server_addr;
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| 114 | sprintf(buffer, "%s", inet_ntoa(temp_addr));
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| 115 | temp_addr.s_addr = requested_ip;
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| 116 | LOG(LOG_INFO, "Unicasting a release of %s to %s",
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| 117 | inet_ntoa(temp_addr), buffer);
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| 118 | send_release(server_addr, requested_ip); /* unicast */
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| 119 | udhcp_run_script(NULL, "deconfig");
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| 120 | }
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| 121 | LOG(LOG_INFO, "Entering released state");
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| 122 |
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| 123 | change_mode(LISTEN_NONE);
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| 124 | state = RELEASED;
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| 125 | timeout = 0x7fffffff;
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| 126 | }
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| 127 |
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| 128 |
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| 129 | static void client_background(void)
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| 130 | {
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| 131 | udhcp_background(client_config.pidfile);
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| 132 | client_config.foreground = 1; /* Do not fork again. */
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| 133 | client_config.background_if_no_lease = 0;
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| 134 | }
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| 135 |
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| 136 |
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| 137 | int udhcpc_main(int argc, char *argv[])
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| 138 | {
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| 139 | uint8_t *temp, *message;
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| 140 | unsigned long t1 = 0, t2 = 0, xid = 0;
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| 141 | unsigned long start = 0, lease;
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| 142 | fd_set rfds;
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| 143 | int retval;
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| 144 | struct timeval tv;
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| 145 | int c, len;
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| 146 | struct dhcpMessage packet;
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| 147 | struct in_addr temp_addr;
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| 148 | long now;
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| 149 | int max_fd;
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| 150 | int sig;
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| 151 | int no_clientid = 0;
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| 152 |
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| 153 | static const struct option arg_options[] = {
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| 154 | {"clientid", required_argument, 0, 'c'},
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| 155 | {"clientid-none", no_argument, 0, 'C'},
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| 156 | {"vendorclass", required_argument, 0, 'V'},
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| 157 | {"foreground", no_argument, 0, 'f'},
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| 158 | {"background", no_argument, 0, 'b'},
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| 159 | {"hostname", required_argument, 0, 'H'},
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| 160 | {"hostname", required_argument, 0, 'h'},
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| 161 | {"fqdn", required_argument, 0, 'F'},
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| 162 | {"interface", required_argument, 0, 'i'},
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| 163 | {"now", no_argument, 0, 'n'},
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| 164 | {"pidfile", required_argument, 0, 'p'},
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| 165 | {"quit", no_argument, 0, 'q'},
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| 166 | {"request", required_argument, 0, 'r'},
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| 167 | {"script", required_argument, 0, 's'},
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| 168 | {"timeout", required_argument, 0, 'T'},
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| 169 | {"version", no_argument, 0, 'v'},
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| 170 | {"retries", required_argument, 0, 't'},
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| 171 | {0, 0, 0, 0}
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| 172 | };
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| 173 |
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| 174 | /* get options */
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| 175 | while (1) {
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| 176 | int option_index = 0;
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| 177 | c = getopt_long(argc, argv, "c:CV:fbH:h:F:i:np:qr:s:T:t:v", arg_options, &option_index);
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| 178 | if (c == -1) break;
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| 179 |
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| 180 | switch (c) {
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| 181 | case 'c':
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| 182 | if (no_clientid) bb_show_usage();
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| 183 | len = strlen(optarg) > 255 ? 255 : strlen(optarg);
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| 184 | free(client_config.clientid);
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| 185 | client_config.clientid = xmalloc(len + 2);
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| 186 | client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
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| 187 | client_config.clientid[OPT_LEN] = len;
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| 188 | client_config.clientid[OPT_DATA] = '\0';
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| 189 | strncpy((char*)client_config.clientid + OPT_DATA, optarg, len);
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| 190 | break;
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| 191 | case 'C':
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| 192 | if (client_config.clientid) bb_show_usage();
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| 193 | no_clientid = 1;
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| 194 | break;
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| 195 | case 'V':
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| 196 | len = strlen(optarg) > 255 ? 255 : strlen(optarg);
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| 197 | free(client_config.vendorclass);
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| 198 | client_config.vendorclass = xmalloc(len + 2);
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| 199 | client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
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| 200 | client_config.vendorclass[OPT_LEN] = len;
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| 201 | strncpy((char*)client_config.vendorclass + OPT_DATA, optarg, len);
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| 202 | break;
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| 203 | case 'f':
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| 204 | client_config.foreground = 1;
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| 205 | break;
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| 206 | case 'b':
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| 207 | client_config.background_if_no_lease = 1;
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| 208 | break;
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| 209 | case 'h':
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| 210 | case 'H':
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| 211 | len = strlen(optarg) > 255 ? 255 : strlen(optarg);
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| 212 | free(client_config.hostname);
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| 213 | client_config.hostname = xmalloc(len + 2);
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| 214 | client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
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| 215 | client_config.hostname[OPT_LEN] = len;
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| 216 | strncpy((char*)client_config.hostname + 2, optarg, len);
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| 217 | break;
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| 218 | case 'F':
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| 219 | len = strlen(optarg) > 255 ? 255 : strlen(optarg);
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| 220 | free(client_config.fqdn);
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| 221 | client_config.fqdn = xmalloc(len + 5);
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| 222 | client_config.fqdn[OPT_CODE] = DHCP_FQDN;
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| 223 | client_config.fqdn[OPT_LEN] = len + 3;
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| 224 | /* Flags: 0000NEOS
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| 225 | S: 1 => Client requests Server to update A RR in DNS as well as PTR
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| 226 | O: 1 => Server indicates to client that DNS has been updated regardless
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| 227 | E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
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| 228 | N: 1 => Client requests Server to not update DNS
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| 229 | */
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| 230 | client_config.fqdn[OPT_LEN + 1] = 0x1;
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| 231 | client_config.fqdn[OPT_LEN + 2] = 0;
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| 232 | client_config.fqdn[OPT_LEN + 3] = 0;
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| 233 | strncpy((char*)client_config.fqdn + 5, optarg, len);
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| 234 | break;
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| 235 | case 'i':
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| 236 | client_config.interface = optarg;
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| 237 | break;
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| 238 | case 'n':
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| 239 | client_config.abort_if_no_lease = 1;
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| 240 | break;
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| 241 | case 'p':
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| 242 | client_config.pidfile = optarg;
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| 243 | break;
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| 244 | case 'q':
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| 245 | client_config.quit_after_lease = 1;
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| 246 | break;
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| 247 | case 'r':
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| 248 | requested_ip = inet_addr(optarg);
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| 249 | break;
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| 250 | case 's':
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| 251 | client_config.script = optarg;
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| 252 | break;
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| 253 | case 'T':
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| 254 | client_config.timeout = atoi(optarg);
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| 255 | break;
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| 256 | case 't':
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| 257 | client_config.retries = atoi(optarg);
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| 258 | break;
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| 259 | case 'v':
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| 260 | printf("version %s\n\n", BB_VER);
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| 261 | return 0;
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| 262 | break;
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| 263 | default:
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| 264 | bb_show_usage();
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| 265 | }
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| 266 | }
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| 267 |
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| 268 | /* Start the log, sanitize fd's, and write a pid file */
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| 269 | udhcp_start_log_and_pid("udhcpc", client_config.pidfile);
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| 270 |
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| 271 | if (read_interface(client_config.interface, &client_config.ifindex,
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| 272 | NULL, client_config.arp) < 0)
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| 273 | return 1;
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| 274 |
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| 275 | /* if not set, and not suppressed, setup the default client ID */
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| 276 | if (!client_config.clientid && !no_clientid) {
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| 277 | client_config.clientid = xmalloc(6 + 3);
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| 278 | client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
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| 279 | client_config.clientid[OPT_LEN] = 7;
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| 280 | client_config.clientid[OPT_DATA] = 1;
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| 281 | memcpy(client_config.clientid + 3, client_config.arp, 6);
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| 282 | }
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| 283 |
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| 284 | if (!client_config.vendorclass) {
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| 285 | client_config.vendorclass = xmalloc(sizeof("udhcp "BB_VER) + 2);
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| 286 | client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
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| 287 | client_config.vendorclass[OPT_LEN] = sizeof("udhcp "BB_VER) - 1;
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| 288 | client_config.vendorclass[OPT_DATA] = 1;
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| 289 | memcpy(&client_config.vendorclass[OPT_DATA],
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| 290 | "udhcp "BB_VER, sizeof("udhcp "BB_VER) - 1);
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| 291 | }
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| 292 |
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| 293 |
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| 294 | /* setup the signal pipe */
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| 295 | udhcp_sp_setup();
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| 296 |
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| 297 | state = INIT_SELECTING;
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| 298 | udhcp_run_script(NULL, "deconfig");
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| 299 | change_mode(LISTEN_RAW);
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| 300 |
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| 301 | for (;;) {
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| 302 |
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| 303 | tv.tv_sec = timeout - uptime();
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| 304 | tv.tv_usec = 0;
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| 305 |
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| 306 | if (listen_mode != LISTEN_NONE && fd < 0) {
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| 307 | if (listen_mode == LISTEN_KERNEL)
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| 308 | fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
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| 309 | else
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| 310 | fd = raw_socket(client_config.ifindex);
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| 311 | if (fd < 0) {
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| 312 | LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m");
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| 313 | return 0;
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| 314 | }
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| 315 | }
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| 316 | max_fd = udhcp_sp_fd_set(&rfds, fd);
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| 317 |
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| 318 | if (tv.tv_sec > 0) {
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| 319 | DEBUG(LOG_INFO, "Waiting on select...");
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| 320 | retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
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| 321 | } else retval = 0; /* If we already timed out, fall through */
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| 322 |
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| 323 | now = uptime();
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| 324 | if (retval == 0) {
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| 325 | /* timeout dropped to zero */
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| 326 | switch (state) {
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| 327 | case INIT_SELECTING:
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| 328 | if (packet_num < client_config.retries) {
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| 329 | if (packet_num == 0)
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| 330 | xid = random_xid();
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| 331 |
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| 332 | /* send discover packet */
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| 333 | send_discover(xid, requested_ip); /* broadcast */
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| 334 |
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| 335 | timeout = now + client_config.timeout;
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| 336 | packet_num++;
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| 337 | } else {
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| 338 | udhcp_run_script(NULL, "leasefail");
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| 339 | if (client_config.background_if_no_lease) {
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| 340 | LOG(LOG_INFO, "No lease, forking to background.");
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| 341 | client_background();
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| 342 | } else if (client_config.abort_if_no_lease) {
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| 343 | LOG(LOG_INFO, "No lease, failing.");
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| 344 | return 1;
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| 345 | }
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| 346 | /* wait to try again */
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| 347 | packet_num = 0;
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| 348 | timeout = now + 60;
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| 349 | }
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| 350 | break;
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| 351 | case RENEW_REQUESTED:
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| 352 | case REQUESTING:
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| 353 | if (packet_num < client_config.retries) {
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| 354 | /* send request packet */
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| 355 | if (state == RENEW_REQUESTED)
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| 356 | send_renew(xid, server_addr, requested_ip); /* unicast */
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| 357 | else send_selecting(xid, server_addr, requested_ip); /* broadcast */
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| 358 |
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| 359 | timeout = now + ((packet_num == 2) ? 10 : 2);
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| 360 | packet_num++;
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| 361 | } else {
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| 362 | /* timed out, go back to init state */
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| 363 | if (state == RENEW_REQUESTED) udhcp_run_script(NULL, "deconfig");
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| 364 | state = INIT_SELECTING;
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| 365 | timeout = now;
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| 366 | packet_num = 0;
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| 367 | change_mode(LISTEN_RAW);
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| 368 | }
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| 369 | break;
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| 370 | case BOUND:
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| 371 | /* Lease is starting to run out, time to enter renewing state */
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| 372 | state = RENEWING;
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| 373 | change_mode(LISTEN_KERNEL);
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| 374 | DEBUG(LOG_INFO, "Entering renew state");
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| 375 | /* fall right through */
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| 376 | case RENEWING:
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| 377 | /* Either set a new T1, or enter REBINDING state */
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| 378 | if ((t2 - t1) <= (lease / 14400 + 1)) {
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| 379 | /* timed out, enter rebinding state */
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| 380 | state = REBINDING;
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| 381 | timeout = now + (t2 - t1);
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| 382 | DEBUG(LOG_INFO, "Entering rebinding state");
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| 383 | } else {
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| 384 | /* send a request packet */
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| 385 | send_renew(xid, server_addr, requested_ip); /* unicast */
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| 386 |
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| 387 | t1 = (t2 - t1) / 2 + t1;
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| 388 | timeout = t1 + start;
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| 389 | }
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| 390 | break;
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| 391 | case REBINDING:
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| 392 | /* Either set a new T2, or enter INIT state */
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| 393 | if ((lease - t2) <= (lease / 14400 + 1)) {
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| 394 | /* timed out, enter init state */
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| 395 | state = INIT_SELECTING;
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| 396 | LOG(LOG_INFO, "Lease lost, entering init state");
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| 397 | udhcp_run_script(NULL, "deconfig");
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| 398 | timeout = now;
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| 399 | packet_num = 0;
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| 400 | change_mode(LISTEN_RAW);
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| 401 | } else {
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| 402 | /* send a request packet */
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| 403 | send_renew(xid, 0, requested_ip); /* broadcast */
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| 404 |
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| 405 | t2 = (lease - t2) / 2 + t2;
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| 406 | timeout = t2 + start;
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| 407 | }
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| 408 | break;
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| 409 | case RELEASED:
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| 410 | /* yah, I know, *you* say it would never happen */
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| 411 | timeout = 0x7fffffff;
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| 412 | break;
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| 413 | }
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| 414 | } else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
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| 415 | /* a packet is ready, read it */
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| 416 |
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| 417 | if (listen_mode == LISTEN_KERNEL)
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| 418 | len = udhcp_get_packet(&packet, fd);
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| 419 | else len = get_raw_packet(&packet, fd);
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| 420 |
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| 421 | if (len == -1 && errno != EINTR) {
|
---|
| 422 | DEBUG(LOG_INFO, "error on read, %m, reopening socket");
|
---|
| 423 | change_mode(listen_mode); /* just close and reopen */
|
---|
| 424 | }
|
---|
| 425 | if (len < 0) continue;
|
---|
| 426 |
|
---|
| 427 | if (packet.xid != xid) {
|
---|
| 428 | DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
|
---|
| 429 | (unsigned long) packet.xid, xid);
|
---|
| 430 | continue;
|
---|
| 431 | }
|
---|
| 432 |
|
---|
| 433 | /* Ignore packets that aren't for us */
|
---|
| 434 | if (memcmp(packet.chaddr, client_config.arp, 6)) {
|
---|
| 435 | DEBUG(LOG_INFO, "packet does not have our chaddr -- ignoring");
|
---|
| 436 | continue;
|
---|
| 437 | }
|
---|
| 438 |
|
---|
| 439 | if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
|
---|
| 440 | DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
|
---|
| 441 | continue;
|
---|
| 442 | }
|
---|
| 443 |
|
---|
| 444 | switch (state) {
|
---|
| 445 | case INIT_SELECTING:
|
---|
| 446 | /* Must be a DHCPOFFER to one of our xid's */
|
---|
| 447 | if (*message == DHCPOFFER) {
|
---|
| 448 | if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
|
---|
| 449 | memcpy(&server_addr, temp, 4);
|
---|
| 450 | xid = packet.xid;
|
---|
| 451 | requested_ip = packet.yiaddr;
|
---|
| 452 |
|
---|
| 453 | /* enter requesting state */
|
---|
| 454 | state = REQUESTING;
|
---|
| 455 | timeout = now;
|
---|
| 456 | packet_num = 0;
|
---|
| 457 | } else {
|
---|
| 458 | DEBUG(LOG_ERR, "No server ID in message");
|
---|
| 459 | }
|
---|
| 460 | }
|
---|
| 461 | break;
|
---|
| 462 | case RENEW_REQUESTED:
|
---|
| 463 | case REQUESTING:
|
---|
| 464 | case RENEWING:
|
---|
| 465 | case REBINDING:
|
---|
| 466 | if (*message == DHCPACK) {
|
---|
| 467 | if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
|
---|
| 468 | LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease");
|
---|
| 469 | lease = 60 * 60;
|
---|
| 470 | } else {
|
---|
| 471 | memcpy(&lease, temp, 4);
|
---|
| 472 | lease = ntohl(lease);
|
---|
| 473 | }
|
---|
| 474 |
|
---|
| 475 | /* enter bound state */
|
---|
| 476 | t1 = lease / 2;
|
---|
| 477 |
|
---|
| 478 | /* little fixed point for n * .875 */
|
---|
| 479 | t2 = (lease * 0x7) >> 3;
|
---|
| 480 | temp_addr.s_addr = packet.yiaddr;
|
---|
| 481 | LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
|
---|
| 482 | inet_ntoa(temp_addr), lease);
|
---|
| 483 | start = now;
|
---|
| 484 | timeout = t1 + start;
|
---|
| 485 | requested_ip = packet.yiaddr;
|
---|
| 486 | udhcp_run_script(&packet,
|
---|
| 487 | ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
|
---|
| 488 |
|
---|
| 489 | state = BOUND;
|
---|
| 490 | change_mode(LISTEN_NONE);
|
---|
| 491 | if (client_config.quit_after_lease)
|
---|
| 492 | return 0;
|
---|
| 493 | if (!client_config.foreground)
|
---|
| 494 | client_background();
|
---|
| 495 |
|
---|
| 496 | } else if (*message == DHCPNAK) {
|
---|
| 497 | /* return to init state */
|
---|
| 498 | LOG(LOG_INFO, "Received DHCP NAK");
|
---|
| 499 | udhcp_run_script(&packet, "nak");
|
---|
| 500 | if (state != REQUESTING)
|
---|
| 501 | udhcp_run_script(NULL, "deconfig");
|
---|
| 502 | state = INIT_SELECTING;
|
---|
| 503 | timeout = now;
|
---|
| 504 | requested_ip = 0;
|
---|
| 505 | packet_num = 0;
|
---|
| 506 | change_mode(LISTEN_RAW);
|
---|
| 507 | sleep(3); /* avoid excessive network traffic */
|
---|
| 508 | }
|
---|
| 509 | break;
|
---|
| 510 | /* case BOUND, RELEASED: - ignore all packets */
|
---|
| 511 | }
|
---|
| 512 | } else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
|
---|
| 513 | switch (sig) {
|
---|
| 514 | case SIGUSR1:
|
---|
| 515 | perform_renew();
|
---|
| 516 | break;
|
---|
| 517 | case SIGUSR2:
|
---|
| 518 | perform_release();
|
---|
| 519 | break;
|
---|
| 520 | case SIGTERM:
|
---|
| 521 | LOG(LOG_INFO, "Received SIGTERM");
|
---|
| 522 | return 0;
|
---|
| 523 | }
|
---|
| 524 | } else if (retval == -1 && errno == EINTR) {
|
---|
| 525 | /* a signal was caught */
|
---|
| 526 | } else {
|
---|
| 527 | /* An error occured */
|
---|
| 528 | DEBUG(LOG_ERR, "Error on select");
|
---|
| 529 | }
|
---|
| 530 |
|
---|
| 531 | }
|
---|
| 532 | return 0;
|
---|
| 533 | }
|
---|