X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Fudhcp%2Foptions.c;h=581a7b67134f7efcafd2a21c249d32921bc269d0;hb=9f57cf6604638f14390effa01b51c8ad979f14cd;hp=d394b4c39cc5ab9d725f819ac399f9b6aa201488;hpb=7031f62d9b750568b5e98bdb8c59c3c1a72e073d;p=oweals%2Fbusybox.git diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c index d394b4c39..581a7b671 100644 --- a/networking/udhcp/options.c +++ b/networking/udhcp/options.c @@ -1,83 +1,143 @@ +/* vi: set sw=4 ts=4: */ /* * options.c -- DHCP server option packet tools * Rewrite by Russ Dill July 2001 + * + * Licensed under GPLv2, see file LICENSE in this tarball for details. */ -#include -#include - #include "common.h" #include "dhcpd.h" #include "options.h" -#include "files.h" - - -/* supported options are easily added here */ -struct dhcp_option dhcp_options[] = { - /* name[10] flags code */ - {"subnet", OPTION_IP | OPTION_REQ, 0x01}, - {"timezone", OPTION_S32, 0x02}, - {"router", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03}, - {"timesvr", OPTION_IP | OPTION_LIST, 0x04}, - {"namesvr", OPTION_IP | OPTION_LIST, 0x05}, - {"dns", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06}, - {"logsvr", OPTION_IP | OPTION_LIST, 0x07}, - {"cookiesvr", OPTION_IP | OPTION_LIST, 0x08}, - {"lprsvr", OPTION_IP | OPTION_LIST, 0x09}, - {"hostname", OPTION_STRING | OPTION_REQ, 0x0c}, - {"bootsize", OPTION_U16, 0x0d}, - {"domain", OPTION_STRING | OPTION_REQ, 0x0f}, - {"swapsvr", OPTION_IP, 0x10}, - {"rootpath", OPTION_STRING, 0x11}, - {"ipttl", OPTION_U8, 0x17}, - {"mtu", OPTION_U16, 0x1a}, - {"broadcast", OPTION_IP | OPTION_REQ, 0x1c}, - {"nisdomain", OPTION_STRING | OPTION_REQ, 0x28}, - {"nissrv", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x29}, - {"ntpsrv", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a}, - {"wins", OPTION_IP | OPTION_LIST, 0x2c}, - {"requestip", OPTION_IP, 0x32}, - {"lease", OPTION_U32, 0x33}, - {"dhcptype", OPTION_U8, 0x35}, - {"serverid", OPTION_IP, 0x36}, - {"message", OPTION_STRING, 0x38}, - {"tftp", OPTION_STRING, 0x42}, - {"bootfile", OPTION_STRING, 0x43}, - {"", 0x00, 0x00} + + +/* Supported options are easily added here */ +const struct dhcp_option dhcp_options[] = { + /* flags code */ + { OPTION_IP | OPTION_REQ, 0x01 }, /* DHCP_SUBNET */ + { OPTION_S32 , 0x02 }, /* DHCP_TIME_OFFSET */ + { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03 }, /* DHCP_ROUTER */ + { OPTION_IP | OPTION_LIST , 0x04 }, /* DHCP_TIME_SERVER */ + { OPTION_IP | OPTION_LIST , 0x05 }, /* DHCP_NAME_SERVER */ + { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06 }, /* DHCP_DNS_SERVER */ + { OPTION_IP | OPTION_LIST , 0x07 }, /* DHCP_LOG_SERVER */ + { OPTION_IP | OPTION_LIST , 0x08 }, /* DHCP_COOKIE_SERVER */ + { OPTION_IP | OPTION_LIST , 0x09 }, /* DHCP_LPR_SERVER */ + { OPTION_STRING | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */ + { OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */ + { OPTION_STRING | OPTION_LIST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */ + { OPTION_IP , 0x10 }, /* DHCP_SWAP_SERVER */ + { OPTION_STRING , 0x11 }, /* DHCP_ROOT_PATH */ + { OPTION_U8 , 0x17 }, /* DHCP_IP_TTL */ + { OPTION_U16 , 0x1a }, /* DHCP_MTU */ + { OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */ + { OPTION_STRING , 0x28 }, /* nisdomain */ + { OPTION_IP | OPTION_LIST , 0x29 }, /* nissrv */ + { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */ + { OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */ + { OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */ + { OPTION_U32 , 0x33 }, /* DHCP_LEASE_TIME */ + { OPTION_U8 , 0x35 }, /* dhcptype */ + { OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */ + { OPTION_STRING , 0x38 }, /* DHCP_MESSAGE */ + { OPTION_STRING , 0x3C }, /* DHCP_VENDOR */ + { OPTION_STRING , 0x3D }, /* DHCP_CLIENT_ID */ + { OPTION_STRING , 0x42 }, /* tftp */ + { OPTION_STRING , 0x43 }, /* bootfile */ + { OPTION_STRING , 0x4D }, /* userclass */ +#if ENABLE_FEATURE_UDHCP_RFC3397 + { OPTION_STR1035 | OPTION_LIST , 0x77 }, /* search */ +#endif + /* MSIE's "Web Proxy Autodiscovery Protocol" support */ + { OPTION_STRING , 0xfc }, /* wpad */ + + /* Options below have no match in dhcp_option_strings[], + * are not passed to dhcpc scripts, and cannot be specified + * with "option XXX YYY" syntax in dhcpd config file. */ + + { OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */ + { } /* zeroed terminating entry */ }; +/* Used for converting options from incoming packets to env variables + * for udhcpc stript */ +/* Must match dhcp_options[] order */ +const char dhcp_option_strings[] ALIGN1 = + "subnet" "\0" /* DHCP_SUBNET */ + "timezone" "\0" /* DHCP_TIME_OFFSET */ + "router" "\0" /* DHCP_ROUTER */ + "timesrv" "\0" /* DHCP_TIME_SERVER */ + "namesrv" "\0" /* DHCP_NAME_SERVER */ + "dns" "\0" /* DHCP_DNS_SERVER */ + "logsrv" "\0" /* DHCP_LOG_SERVER */ + "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */ + "lprsrv" "\0" /* DHCP_LPR_SERVER */ + "hostname" "\0" /* DHCP_HOST_NAME */ + "bootsize" "\0" /* DHCP_BOOT_SIZE */ + "domain" "\0" /* DHCP_DOMAIN_NAME */ + "swapsrv" "\0" /* DHCP_SWAP_SERVER */ + "rootpath" "\0" /* DHCP_ROOT_PATH */ + "ipttl" "\0" /* DHCP_IP_TTL */ + "mtu" "\0" /* DHCP_MTU */ + "broadcast" "\0" /* DHCP_BROADCAST */ + "nisdomain" "\0" /* */ + "nissrv" "\0" /* */ + "ntpsrv" "\0" /* DHCP_NTP_SERVER */ + "wins" "\0" /* DHCP_WINS_SERVER */ + "requestip" "\0" /* DHCP_REQUESTED_IP */ + "lease" "\0" /* DHCP_LEASE_TIME */ + "dhcptype" "\0" /* */ + "serverid" "\0" /* DHCP_SERVER_ID */ + "message" "\0" /* DHCP_MESSAGE */ + "vendorclass" "\0" /* DHCP_VENDOR */ + "clientid" "\0" /* DHCP_CLIENT_ID */ + "tftp" "\0" + "bootfile" "\0" + "userclass" "\0" +#if ENABLE_FEATURE_UDHCP_RFC3397 + "search" "\0" +#endif + /* MSIE's "Web Proxy Autodiscovery Protocol" support */ + "wpad" "\0" + ; + + /* Lengths of the different option types */ -int option_lengths[] = { - [OPTION_IP] = 4, - [OPTION_IP_PAIR] = 8, - [OPTION_BOOLEAN] = 1, - [OPTION_STRING] = 1, - [OPTION_U8] = 1, - [OPTION_U16] = 2, - [OPTION_S16] = 2, - [OPTION_U32] = 4, - [OPTION_S32] = 4 +const uint8_t dhcp_option_lengths[] ALIGN1 = { + [OPTION_IP] = 4, + [OPTION_IP_PAIR] = 8, + [OPTION_BOOLEAN] = 1, + [OPTION_STRING] = 1, +#if ENABLE_FEATURE_UDHCP_RFC3397 + [OPTION_STR1035] = 1, +#endif + [OPTION_U8] = 1, + [OPTION_U16] = 2, + [OPTION_S16] = 2, + [OPTION_U32] = 4, + [OPTION_S32] = 4 }; /* get an option with bounds checking (warning, not aligned). */ -uint8_t *get_option(struct dhcpMessage *packet, int code) +uint8_t* FAST_FUNC get_option(struct dhcpMessage *packet, int code) { int i, length; uint8_t *optionptr; - int over = 0, done = 0, curr = OPTION_FIELD; + int over = 0; + int curr = OPTION_FIELD; optionptr = packet->options; i = 0; - length = 308; - while (!done) { + length = sizeof(packet->options); + while (1) { if (i >= length) { - LOG(LOG_WARNING, "bogus packet, option fields too long."); + bb_error_msg("bogus packet, option fields too long"); return NULL; } if (optionptr[i + OPT_CODE] == code) { if (i + 1 + optionptr[i + OPT_LEN] >= length) { - LOG(LOG_WARNING, "bogus packet, option fields too long."); + bb_error_msg("bogus packet, option fields too long"); return NULL; } return optionptr + i + 2; @@ -88,24 +148,25 @@ uint8_t *get_option(struct dhcpMessage *packet, int code) break; case DHCP_OPTION_OVER: if (i + 1 + optionptr[i + OPT_LEN] >= length) { - LOG(LOG_WARNING, "bogus packet, option fields too long."); + bb_error_msg("bogus packet, option fields too long"); return NULL; } over = optionptr[i + 3]; i += optionptr[OPT_LEN] + 2; break; case DHCP_END: - if (curr == OPTION_FIELD && over & FILE_FIELD) { + if (curr == OPTION_FIELD && (over & FILE_FIELD)) { optionptr = packet->file; i = 0; - length = 128; + length = sizeof(packet->file); curr = FILE_FIELD; - } else if (curr == FILE_FIELD && over & SNAME_FIELD) { + } else if (curr == FILE_FIELD && (over & SNAME_FIELD)) { optionptr = packet->sname; i = 0; - length = 64; + length = sizeof(packet->sname); curr = SNAME_FIELD; - } else done = 1; + } else + return NULL; break; default: i += optionptr[OPT_LEN + i] + 2; @@ -116,13 +177,15 @@ uint8_t *get_option(struct dhcpMessage *packet, int code) /* return the position of the 'end' option (no bounds checking) */ -int end_option(uint8_t *optionptr) +int FAST_FUNC end_option(uint8_t *optionptr) { int i = 0; while (optionptr[i] != DHCP_END) { - if (optionptr[i] == DHCP_PADDING) i++; - else i += optionptr[i + OPT_LEN] + 2; + if (optionptr[i] == DHCP_PADDING) + i++; + else + i += optionptr[i + OPT_LEN] + 2; } return i; } @@ -130,16 +193,17 @@ int end_option(uint8_t *optionptr) /* add an option string to the options (an option string contains an option code, * length, then data) */ -int add_option_string(uint8_t *optionptr, uint8_t *string) +int FAST_FUNC add_option_string(uint8_t *optionptr, uint8_t *string) { int end = end_option(optionptr); /* end position + string length + option code/length + end option */ - if (end + string[OPT_LEN] + 2 + 1 >= 308) { - LOG(LOG_ERR, "Option 0x%02x did not fit into the packet!", string[OPT_CODE]); + if (end + string[OPT_LEN] + 2 + 1 >= DHCP_OPTIONS_BUFSIZE) { + bb_error_msg("option 0x%02x did not fit into the packet", + string[OPT_CODE]); return 0; } - DEBUG(LOG_INFO, "adding option 0x%02x", string[OPT_CODE]); + DEBUG("adding option 0x%02x", string[OPT_CODE]); memcpy(optionptr + end, string, string[OPT_LEN] + 2); optionptr[end + string[OPT_LEN] + 2] = DHCP_END; return string[OPT_LEN] + 2; @@ -147,26 +211,25 @@ int add_option_string(uint8_t *optionptr, uint8_t *string) /* add a one to four byte option to a packet */ -int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) +int FAST_FUNC add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) { - struct dhcp_option *dh; + const struct dhcp_option *dh; - for (dh=dhcp_options; dh->code; dh++) { + for (dh = dhcp_options; dh->code; dh++) { if (dh->code == code) { uint8_t option[6], len; option[OPT_CODE] = code; - len = option_lengths[dh->flags & TYPE_MASK]; + len = dhcp_option_lengths[dh->flags & TYPE_MASK]; option[OPT_LEN] = len; - if (__BYTE_ORDER == __BIG_ENDIAN) + if (BB_BIG_ENDIAN) data <<= 8 * (4 - len); - /* This memcpy is for broken processors which can't - * handle a simple unaligned 32-bit assignment */ - memcpy(&option[OPT_DATA], &data, 4); + /* Assignment is unaligned! */ + move_to_unaligned32(&option[OPT_DATA], data); return add_option_string(optionptr, option); } } - DEBUG(LOG_ERR, "Could not add option 0x%02x", code); + bb_error_msg("cannot add option 0x%02x", code); return 0; }