X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Fudhcp%2Foptions.c;h=6526472297ed7b24c89d61fde99fad9ffec0af42;hb=e40c04b82695c1cde8ad9ed1e2aa1756463d73a7;hp=a3edd0b8be64ac6d4837b25c8bef68e47368d7d7;hpb=24833430bc2dbea733c3b0b9ea6c6b976f95474a;p=oweals%2Fbusybox.git diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c index a3edd0b8b..652647229 100644 --- a/networking/udhcp/options.c +++ b/networking/udhcp/options.c @@ -1,19 +1,20 @@ -/* - * options.c -- DHCP server option packet tools +/* vi: set sw=4 ts=4: */ +/* + * options.c -- DHCP server option packet tools * Rewrite by Russ Dill July 2001 */ - + #include #include +#include "common.h" #include "dhcpd.h" -#include "files.h" #include "options.h" -#include "common.h" +#include "files.h" /* supported options are easily added here */ -struct dhcp_option options[] = { +struct dhcp_option dhcp_options[] = { /* name[10] flags code */ {"subnet", OPTION_IP | OPTION_REQ, 0x01}, {"timezone", OPTION_S32, 0x02}, @@ -32,7 +33,9 @@ struct dhcp_option options[] = { {"ipttl", OPTION_U8, 0x17}, {"mtu", OPTION_U16, 0x1a}, {"broadcast", OPTION_IP | OPTION_REQ, 0x1c}, - {"ntpsrv", OPTION_IP | OPTION_LIST, 0x2a}, + {"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}, @@ -59,34 +62,34 @@ int option_lengths[] = { /* get an option with bounds checking (warning, not aligned). */ -unsigned char *get_option(struct dhcpMessage *packet, int code) +uint8_t *get_option(struct dhcpMessage *packet, int code) { int i, length; - unsigned char *optionptr; + uint8_t *optionptr; int over = 0, done = 0, curr = OPTION_FIELD; - + optionptr = packet->options; i = 0; length = 308; while (!done) { 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; - } + } switch (optionptr[i + OPT_CODE]) { case DHCP_PADDING: i++; 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]; @@ -114,10 +117,10 @@ unsigned char *get_option(struct dhcpMessage *packet, int code) /* return the position of the 'end' option (no bounds checking) */ -int end_option(unsigned char *optionptr) +int 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; @@ -128,16 +131,17 @@ int end_option(unsigned char *optionptr) /* add an option string to the options (an option string contains an option code, * length, then data) */ -int add_option_string(unsigned char *optionptr, unsigned char *string) +int 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]); + 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; @@ -145,84 +149,25 @@ int add_option_string(unsigned char *optionptr, unsigned char *string) /* add a one to four byte option to a packet */ -int add_simple_option(unsigned char *optionptr, unsigned char code, u_int32_t data) +int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) { - char length = 0; - int i; - unsigned char option[2 + 4]; - unsigned char *u8; - u_int16_t *u16; - u_int32_t *u32; - u_int32_t aligned; - u8 = (unsigned char *) &aligned; - u16 = (u_int16_t *) &aligned; - u32 = &aligned; - - for (i = 0; options[i].code; i++) - if (options[i].code == code) { - length = option_lengths[options[i].flags & TYPE_MASK]; + struct dhcp_option *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]; + option[OPT_LEN] = len; + 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); + return add_option_string(optionptr, option); } - - if (!length) { - DEBUG(LOG_ERR, "Could not add option 0x%02x", code); - return 0; } - - option[OPT_CODE] = code; - option[OPT_LEN] = length; - - switch (length) { - case 1: *u8 = data; break; - case 2: *u16 = data; break; - case 4: *u32 = data; break; - } - memcpy(option + 2, &aligned, length); - return add_option_string(optionptr, option); -} - - -/* find option 'code' in opt_list */ -struct option_set *find_option(struct option_set *opt_list, char code) -{ - while (opt_list && opt_list->data[OPT_CODE] < code) - opt_list = opt_list->next; - if (opt_list && opt_list->data[OPT_CODE] == code) return opt_list; - else return NULL; -} - - -/* add an option to the opt_list */ -void attach_option(struct option_set **opt_list, struct dhcp_option *option, char *buffer, int length) -{ - struct option_set *existing, *new, **curr; - - /* add it to an existing option */ - if ((existing = find_option(*opt_list, option->code))) { - DEBUG(LOG_INFO, "Attaching option %s to existing member of list", option->name); - if (option->flags & OPTION_LIST) { - if (existing->data[OPT_LEN] + length <= 255) { - existing->data = realloc(existing->data, - existing->data[OPT_LEN] + length + 2); - memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length); - existing->data[OPT_LEN] += length; - } /* else, ignore the data, we could put this in a second option in the future */ - } /* else, ignore the new data */ - } else { - DEBUG(LOG_INFO, "Attaching option %s to list", option->name); - - /* make a new option */ - new = xmalloc(sizeof(struct option_set)); - new->data = xmalloc(length + 2); - new->data[OPT_CODE] = option->code; - new->data[OPT_LEN] = length; - memcpy(new->data + 2, buffer, length); - - curr = opt_list; - while (*curr && (*curr)->data[OPT_CODE] < option->code) - curr = &(*curr)->next; - - new->next = *curr; - *curr = new; - } + bb_error_msg("Could not add option 0x%02x", code); + return 0; }