diff options
Diffstat (limited to 'networking/udhcp/common.c')
| -rw-r--r-- | networking/udhcp/common.c | 47 |
1 files changed, 38 insertions, 9 deletions
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c index fb4f8d1..50e2c84 100644 --- a/networking/udhcp/common.c +++ b/networking/udhcp/common.c @@ -324,9 +324,27 @@ int FAST_FUNC udhcp_str2nip(const char *str, void *arg) } /* udhcp_str2optset: - * Parse string option representation to binary form - * and add it to opt_list + * 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, @@ -335,13 +353,12 @@ static NOINLINE void attach_option( int length) { struct option_set *existing, *new, **curr; -#if ENABLE_FEATURE_UDHCP_RFC3397 char *allocated = NULL; -#endif 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 */ @@ -368,7 +385,8 @@ static NOINLINE void attach_option( unsigned old_len; /* add it to an existing option */ - log1("Attaching option %02x to existing member of list", optflag->code); + 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) { @@ -390,10 +408,8 @@ static NOINLINE void attach_option( } /* else, ignore the data, we could put this in a second option in the future */ } /* else, ignore the new data */ - ret: ; -#if ENABLE_FEATURE_UDHCP_RFC3397 + ret: free(allocated); -#endif } int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg) @@ -402,6 +418,8 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg) char *opt, *val, *endptr; char *str; const struct dhcp_optflag *optflag; + struct dhcp_optflag bin_optflag; + unsigned optcode; int retval, length; char buffer[8] ALIGNED(4); uint16_t *result_u16 = (uint16_t *) buffer; @@ -413,7 +431,15 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg) if (!opt) return 0; - optflag = &dhcp_optflags[udhcp_option_idx(opt)]; + 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 { @@ -482,6 +508,9 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg) retval = (endptr[0] == '\0'); break; } + case OPTION_BIN: /* handled in attach_option() */ + opt = val; + retval = 1; default: break; } |