| /* vi: set sw=4 ts=4: */ |
| /* |
| * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001 |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| #include "common.h" |
| |
| #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1 |
| unsigned dhcp_verbose; |
| #endif |
| |
| const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = { |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
| }; |
| |
| /* Supported options are easily added here. |
| * See RFC2132 for more options. |
| * OPTION_REQ: these options are requested by udhcpc (unless -o). |
| */ |
| const struct dhcp_optflag dhcp_optflags[] = { |
| /* 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_HOST | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */ |
| { OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */ |
| { OPTION_STRING_HOST | 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 */ |
| //TODO: why do we request DHCP_BROADCAST? Can't we assume that |
| //in the unlikely case it is different from typical N.N.255.255, |
| //server would let us know anyway? |
| { OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */ |
| { OPTION_IP_PAIR | OPTION_LIST , 0x21 }, /* DHCP_ROUTES */ |
| { OPTION_STRING_HOST , 0x28 }, /* DHCP_NIS_DOMAIN */ |
| { OPTION_IP | OPTION_LIST , 0x29 }, /* DHCP_NIS_SERVER */ |
| { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */ |
| { OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */ |
| { OPTION_U32 , 0x33 }, /* DHCP_LEASE_TIME */ |
| { OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */ |
| { OPTION_STRING , 0x38 }, /* DHCP_ERR_MESSAGE */ |
| //TODO: must be combined with 'sname' and 'file' handling: |
| { OPTION_STRING_HOST , 0x42 }, /* DHCP_TFTP_SERVER_NAME */ |
| { OPTION_STRING , 0x43 }, /* DHCP_BOOT_FILE */ |
| //TODO: not a string, but a set of LASCII strings: |
| // { OPTION_STRING , 0x4D }, /* DHCP_USER_CLASS */ |
| #if ENABLE_FEATURE_UDHCP_RFC3397 |
| { OPTION_DNS_STRING | OPTION_LIST , 0x77 }, /* DHCP_DOMAIN_SEARCH */ |
| { OPTION_SIP_SERVERS , 0x78 }, /* DHCP_SIP_SERVERS */ |
| #endif |
| { OPTION_STATIC_ROUTES | OPTION_LIST , 0x79 }, /* DHCP_STATIC_ROUTES */ |
| #if ENABLE_FEATURE_UDHCP_8021Q |
| { OPTION_U16 , 0x84 }, /* DHCP_VLAN_ID */ |
| { OPTION_U8 , 0x85 }, /* DHCP_VLAN_PRIORITY */ |
| #endif |
| { OPTION_6RD , 0xd4 }, /* DHCP_6RD */ |
| { OPTION_STATIC_ROUTES | OPTION_LIST , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */ |
| { OPTION_STRING , 0xfc }, /* DHCP_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. |
| * These entries are only used internally by udhcp[cd] |
| * to correctly encode options into packets. |
| */ |
| |
| { OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */ |
| { OPTION_U8 , 0x35 }, /* DHCP_MESSAGE_TYPE */ |
| { OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */ |
| //looks like these opts will work just fine even without these defs: |
| // { OPTION_STRING , 0x3c }, /* DHCP_VENDOR */ |
| // /* not really a string: */ |
| // { OPTION_STRING , 0x3d }, /* DHCP_CLIENT_ID */ |
| { 0, 0 } /* zeroed terminating entry */ |
| }; |
| |
| /* Used for converting options from incoming packets to env variables |
| * for udhcpc stript, and for setting options for udhcpd via |
| * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file. |
| */ |
| /* Must match dhcp_optflags[] 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 */ |
| "routes" "\0" /* DHCP_ROUTES */ |
| "nisdomain" "\0" /* DHCP_NIS_DOMAIN */ |
| "nissrv" "\0" /* DHCP_NIS_SERVER */ |
| "ntpsrv" "\0" /* DHCP_NTP_SERVER */ |
| "wins" "\0" /* DHCP_WINS_SERVER */ |
| "lease" "\0" /* DHCP_LEASE_TIME */ |
| "serverid" "\0" /* DHCP_SERVER_ID */ |
| "message" "\0" /* DHCP_ERR_MESSAGE */ |
| "tftp" "\0" /* DHCP_TFTP_SERVER_NAME */ |
| "bootfile" "\0" /* DHCP_BOOT_FILE */ |
| // "userclass" "\0" /* DHCP_USER_CLASS */ |
| #if ENABLE_FEATURE_UDHCP_RFC3397 |
| "search" "\0" /* DHCP_DOMAIN_SEARCH */ |
| // doesn't work in udhcpd.conf since OPTION_SIP_SERVERS |
| // is not handled yet by "string->option" conversion code: |
| "sipsrv" "\0" /* DHCP_SIP_SERVERS */ |
| #endif |
| "staticroutes" "\0"/* DHCP_STATIC_ROUTES */ |
| #if ENABLE_FEATURE_UDHCP_8021Q |
| "vlanid" "\0" /* DHCP_VLAN_ID */ |
| "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY */ |
| #endif |
| "ip6rd" "\0" /* DHCP_6RD */ |
| "msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */ |
| "wpad" "\0" /* DHCP_WPAD */ |
| ; |
| |
| /* Lengths of the option types in binary form. |
| * Used by: |
| * udhcp_str2optset: to determine how many bytes to allocate. |
| * xmalloc_optname_optval: to estimate string length |
| * from binary option length: (option[LEN] / dhcp_option_lengths[opt_type]) |
| * is the number of elements, multiply in by one element's string width |
| * (len_of_option_as_string[opt_type]) and you know how wide string you need. |
| */ |
| const uint8_t dhcp_option_lengths[] ALIGN1 = { |
| [OPTION_IP] = 4, |
| [OPTION_IP_PAIR] = 8, |
| // [OPTION_BOOLEAN] = 1, |
| [OPTION_STRING] = 1, /* ignored by udhcp_str2optset */ |
| [OPTION_STRING_HOST] = 1, /* ignored by udhcp_str2optset */ |
| #if ENABLE_FEATURE_UDHCP_RFC3397 |
| [OPTION_DNS_STRING] = 1, /* ignored by both udhcp_str2optset and xmalloc_optname_optval */ |
| [OPTION_SIP_SERVERS] = 1, |
| #endif |
| [OPTION_U8] = 1, |
| [OPTION_U16] = 2, |
| // [OPTION_S16] = 2, |
| [OPTION_U32] = 4, |
| [OPTION_S32] = 4, |
| /* Just like OPTION_STRING, we use minimum length here */ |
| [OPTION_STATIC_ROUTES] = 5, |
| [OPTION_6RD] = 22, /* ignored by udhcp_str2optset */ |
| }; |
| |
| |
| #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2 |
| static void log_option(const char *pfx, const uint8_t *opt) |
| { |
| if (dhcp_verbose >= 2) { |
| char buf[256 * 2 + 2]; |
| *bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0'; |
| bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf); |
| } |
| } |
| #else |
| # define log_option(pfx, opt) ((void)0) |
| #endif |
| |
| unsigned FAST_FUNC udhcp_option_idx(const char *name) |
| { |
| int n = index_in_strings(dhcp_option_strings, name); |
| if (n >= 0) |
| return n; |
| |
| { |
| char buf[sizeof(dhcp_option_strings)]; |
| char *d = buf; |
| const char *s = dhcp_option_strings; |
| while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) { |
| *d++ = (*s == '\0' ? ' ' : *s); |
| s++; |
| } |
| *d = '\0'; |
| bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf); |
| } |
| } |
| |
| /* Get an option with bounds checking (warning, result is not aligned) */ |
| uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code) |
| { |
| uint8_t *optionptr; |
| int len; |
| int rem; |
| int overload = 0; |
| enum { |
| FILE_FIELD101 = FILE_FIELD * 0x101, |
| SNAME_FIELD101 = SNAME_FIELD * 0x101, |
| }; |
| |
| /* option bytes: [code][len][data1][data2]..[dataLEN] */ |
| optionptr = packet->options; |
| rem = sizeof(packet->options); |
| while (1) { |
| if (rem <= 0) { |
| bb_error_msg("bad packet, malformed option field"); |
| return NULL; |
| } |
| if (optionptr[OPT_CODE] == DHCP_PADDING) { |
| rem--; |
| optionptr++; |
| continue; |
| } |
| if (optionptr[OPT_CODE] == DHCP_END) { |
| if ((overload & FILE_FIELD101) == FILE_FIELD) { |
| /* can use packet->file, and didn't look at it yet */ |
| overload |= FILE_FIELD101; /* "we looked at it" */ |
| optionptr = packet->file; |
| rem = sizeof(packet->file); |
| continue; |
| } |
| if ((overload & SNAME_FIELD101) == SNAME_FIELD) { |
| /* can use packet->sname, and didn't look at it yet */ |
| overload |= SNAME_FIELD101; /* "we looked at it" */ |
| optionptr = packet->sname; |
| rem = sizeof(packet->sname); |
| continue; |
| } |
| break; |
| } |
| len = 2 + optionptr[OPT_LEN]; |
| rem -= len; |
| if (rem < 0) |
| continue; /* complain and return NULL */ |
| |
| if (optionptr[OPT_CODE] == code) { |
| log_option("Option found", optionptr); |
| return optionptr + OPT_DATA; |
| } |
| |
| if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) { |
| overload |= optionptr[OPT_DATA]; |
| /* fall through */ |
| } |
| optionptr += len; |
| } |
| |
| /* log3 because udhcpc uses it a lot - very noisy */ |
| log3("Option 0x%02x not found", code); |
| return NULL; |
| } |
| |
| /* Return the position of the 'end' option (no bounds checking) */ |
| int FAST_FUNC udhcp_end_option(uint8_t *optionptr) |
| { |
| int i = 0; |
| |
| while (optionptr[i] != DHCP_END) { |
| if (optionptr[i] != DHCP_PADDING) |
| i += optionptr[i + OPT_LEN] + OPT_DATA-1; |
| i++; |
| } |
| return i; |
| } |
| |
| /* Add an option (supplied in binary form) to the options. |
| * Option format: [code][len][data1][data2]..[dataLEN] |
| */ |
| void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) |
| { |
| unsigned len; |
| uint8_t *optionptr = packet->options; |
| unsigned end = udhcp_end_option(optionptr); |
| |
| len = OPT_DATA + addopt[OPT_LEN]; |
| /* end position + (option code/length + addopt length) + end option */ |
| if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) { |
| //TODO: learn how to use overflow option if we exhaust packet->options[] |
| bb_error_msg("option 0x%02x did not fit into the packet", |
| addopt[OPT_CODE]); |
| return; |
| } |
| log_option("Adding option", addopt); |
| memcpy(optionptr + end, addopt, len); |
| optionptr[end + len] = DHCP_END; |
| } |
| |
| /* Add an one to four byte option to a packet */ |
| void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) |
| { |
| const struct dhcp_optflag *dh; |
| |
| for (dh = dhcp_optflags; dh->code; dh++) { |
| if (dh->code == code) { |
| uint8_t option[6], len; |
| |
| option[OPT_CODE] = code; |
| len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK]; |
| option[OPT_LEN] = len; |
| if (BB_BIG_ENDIAN) |
| data <<= 8 * (4 - len); |
| /* Assignment is unaligned! */ |
| move_to_unaligned32(&option[OPT_DATA], data); |
| udhcp_add_binary_option(packet, option); |
| return; |
| } |
| } |
| |
| bb_error_msg("can't add option 0x%02x", code); |
| } |
| |
| /* Find option 'code' in opt_list */ |
| struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t 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; |
| return NULL; |
| } |
| |
| /* Parse string to IP in network order */ |
| int FAST_FUNC udhcp_str2nip(const char *str, void *arg) |
| { |
| len_and_sockaddr *lsa; |
| |
| lsa = host_and_af2sockaddr(str, 0, AF_INET); |
| if (!lsa) |
| return 0; |
| /* arg maybe unaligned */ |
| move_to_unaligned32((uint32_t*)arg, lsa->u.sin.sin_addr.s_addr); |
| free(lsa); |
| return 1; |
| } |
| |
| /* udhcp_str2optset: |
| * Parse string option representation to binary form and add it to opt_list. |
| * Called to parse "udhcpc -x OPTNAME:OPTVAL" |
| * and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives. |
| */ |
| /* helper for the helper */ |
| static char *allocate_tempopt_if_needed( |
| const struct dhcp_optflag *optflag, |
| char *buffer, |
| int *length_p) |
| { |
| char *allocated = NULL; |
| if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) { |
| const char *end; |
| allocated = xstrdup(buffer); /* more than enough */ |
| end = hex2bin(allocated, buffer, 255); |
| if (errno) |
| bb_error_msg_and_die("malformed hex string '%s'", buffer); |
| *length_p = end - allocated; |
| } |
| return allocated; |
| } |
| /* helper: add an option to the opt_list */ |
| static NOINLINE void attach_option( |
| struct option_set **opt_list, |
| const struct dhcp_optflag *optflag, |
| char *buffer, |
| int length) |
| { |
| struct option_set *existing, *new, **curr; |
| char *allocated = NULL; |
| |
| existing = udhcp_find_option(*opt_list, optflag->code); |
| if (!existing) { |
| log2("Attaching option %02x to list", optflag->code); |
| allocated = allocate_tempopt_if_needed(optflag, buffer, &length); |
| #if ENABLE_FEATURE_UDHCP_RFC3397 |
| if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) { |
| /* reuse buffer and length for RFC1035-formatted string */ |
| allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length); |
| } |
| #endif |
| /* make a new option */ |
| new = xmalloc(sizeof(*new)); |
| new->data = xmalloc(length + OPT_DATA); |
| new->data[OPT_CODE] = optflag->code; |
| new->data[OPT_LEN] = length; |
| memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length); |
| |
| curr = opt_list; |
| while (*curr && (*curr)->data[OPT_CODE] < optflag->code) |
| curr = &(*curr)->next; |
| |
| new->next = *curr; |
| *curr = new; |
| goto ret; |
| } |
| |
| if (optflag->flags & OPTION_LIST) { |
| unsigned old_len; |
| |
| /* add it to an existing option */ |
| log2("Attaching option %02x to existing member of list", optflag->code); |
| allocated = allocate_tempopt_if_needed(optflag, buffer, &length); |
| old_len = existing->data[OPT_LEN]; |
| #if ENABLE_FEATURE_UDHCP_RFC3397 |
| if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) { |
| /* reuse buffer and length for RFC1035-formatted string */ |
| allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length); |
| } |
| #endif |
| if (old_len + length < 255) { |
| /* actually 255 is ok too, but adding a space can overlow it */ |
| |
| existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length); |
| if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING |
| || (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST |
| ) { |
| /* add space separator between STRING options in a list */ |
| existing->data[OPT_DATA + old_len] = ' '; |
| old_len++; |
| } |
| memcpy(existing->data + OPT_DATA + old_len, buffer, length); |
| existing->data[OPT_LEN] = old_len + length; |
| } /* else, ignore the data, we could put this in a second option in the future */ |
| } /* else, ignore the new data */ |
| |
| ret: |
| free(allocated); |
| } |
| |
| int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg) |
| { |
| struct option_set **opt_list = arg; |
| char *opt, *val; |
| char *str; |
| const struct dhcp_optflag *optflag; |
| struct dhcp_optflag bin_optflag; |
| unsigned optcode; |
| int retval, length; |
| /* IP_PAIR needs 8 bytes, STATIC_ROUTES needs 9 max */ |
| char buffer[9] ALIGNED(4); |
| uint16_t *result_u16 = (uint16_t *) buffer; |
| uint32_t *result_u32 = (uint32_t *) buffer; |
| |
| /* Cheat, the only *const* str possible is "" */ |
| str = (char *) const_str; |
| opt = strtok(str, " \t="); |
| if (!opt) |
| return 0; |
| |
| optcode = bb_strtou(opt, NULL, 0); |
| if (!errno && optcode < 255) { |
| /* Raw (numeric) option code */ |
| bin_optflag.flags = OPTION_BIN; |
| bin_optflag.code = optcode; |
| optflag = &bin_optflag; |
| } else { |
| optflag = &dhcp_optflags[udhcp_option_idx(opt)]; |
| } |
| |
| retval = 0; |
| do { |
| val = strtok(NULL, ", \t"); |
| if (!val) |
| break; |
| length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK]; |
| retval = 0; |
| opt = buffer; /* new meaning for variable opt */ |
| switch (optflag->flags & OPTION_TYPE_MASK) { |
| case OPTION_IP: |
| retval = udhcp_str2nip(val, buffer); |
| break; |
| case OPTION_IP_PAIR: |
| retval = udhcp_str2nip(val, buffer); |
| val = strtok(NULL, ", \t/-"); |
| if (!val) |
| retval = 0; |
| if (retval) |
| retval = udhcp_str2nip(val, buffer + 4); |
| break; |
| case OPTION_STRING: |
| case OPTION_STRING_HOST: |
| #if ENABLE_FEATURE_UDHCP_RFC3397 |
| case OPTION_DNS_STRING: |
| #endif |
| length = strnlen(val, 254); |
| if (length > 0) { |
| opt = val; |
| retval = 1; |
| } |
| break; |
| // case OPTION_BOOLEAN: { |
| // static const char no_yes[] ALIGN1 = "no\0yes\0"; |
| // buffer[0] = retval = index_in_strings(no_yes, val); |
| // retval++; /* 0 - bad; 1: "no" 2: "yes" */ |
| // break; |
| // } |
| case OPTION_U8: |
| buffer[0] = bb_strtou32(val, NULL, 0); |
| retval = (errno == 0); |
| break; |
| /* htonX are macros in older libc's, using temp var |
| * in code below for safety */ |
| /* TODO: use bb_strtoX? */ |
| case OPTION_U16: { |
| uint32_t tmp = bb_strtou32(val, NULL, 0); |
| *result_u16 = htons(tmp); |
| retval = (errno == 0 /*&& tmp < 0x10000*/); |
| break; |
| } |
| // case OPTION_S16: { |
| // long tmp = bb_strtoi32(val, NULL, 0); |
| // *result_u16 = htons(tmp); |
| // retval = (errno == 0); |
| // break; |
| // } |
| case OPTION_U32: { |
| uint32_t tmp = bb_strtou32(val, NULL, 0); |
| *result_u32 = htonl(tmp); |
| retval = (errno == 0); |
| break; |
| } |
| case OPTION_S32: { |
| int32_t tmp = bb_strtoi32(val, NULL, 0); |
| *result_u32 = htonl(tmp); |
| retval = (errno == 0); |
| break; |
| } |
| case OPTION_STATIC_ROUTES: { |
| /* Input: "a.b.c.d/m" */ |
| /* Output: mask(1 byte),pfx(0-4 bytes),gw(4 bytes) */ |
| unsigned mask; |
| char *slash = strchr(val, '/'); |
| if (slash) { |
| *slash = '\0'; |
| retval = udhcp_str2nip(val, buffer + 1); |
| buffer[0] = mask = bb_strtou(slash + 1, NULL, 10); |
| val = strtok(NULL, ", \t/-"); |
| if (!val || mask > 32 || errno) |
| retval = 0; |
| if (retval) { |
| length = ((mask + 7) >> 3) + 5; |
| retval = udhcp_str2nip(val, buffer + (length - 4)); |
| } |
| } |
| break; |
| } |
| case OPTION_BIN: /* handled in attach_option() */ |
| opt = val; |
| retval = 1; |
| default: |
| break; |
| } |
| if (retval) |
| attach_option(opt_list, optflag, opt, length); |
| } while (retval && (optflag->flags & OPTION_LIST)); |
| |
| return retval; |
| } |
| |
| /* note: ip is a pointer to an IPv6 in network order, possibly misaliged */ |
| int FAST_FUNC sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip) |
| { |
| char hexstrbuf[16 * 2]; |
| bin2hex(hexstrbuf, (void*)ip, 16); |
| return sprintf(dest, /* "%s" */ |
| "%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s", |
| /* pre, */ |
| hexstrbuf + 0 * 4, |
| hexstrbuf + 1 * 4, |
| hexstrbuf + 2 * 4, |
| hexstrbuf + 3 * 4, |
| hexstrbuf + 4 * 4, |
| hexstrbuf + 5 * 4, |
| hexstrbuf + 6 * 4, |
| hexstrbuf + 7 * 4 |
| ); |
| } |