diff options
| -rw-r--r-- | networking/nslookup.c | 204 |
1 files changed, 113 insertions, 91 deletions
diff --git a/networking/nslookup.c b/networking/nslookup.c index c6f4313..112e876 100644 --- a/networking/nslookup.c +++ b/networking/nslookup.c @@ -6,7 +6,7 @@ //config: help //config: nslookup is a tool to query Internet name servers. //config: -//config:config NSLOOKUP_BIG +//config:config FEATURE_NSLOOKUP_BIG //config: bool "Use internal resolver code instead of libc" //config: depends on NSLOOKUP //config: default y @@ -14,17 +14,16 @@ //config:config FEATURE_NSLOOKUP_LONG_OPTIONS //config: bool "Enable long options" //config: default y -//config: depends on NSLOOKUP_BIG && LONG_OPTS +//config: depends on FEATURE_NSLOOKUP_BIG && LONG_OPTS //applet:IF_NSLOOKUP(APPLET(nslookup, BB_DIR_USR_BIN, BB_SUID_DROP)) //kbuild:lib-$(CONFIG_NSLOOKUP) += nslookup.o //usage:#define nslookup_trivial_usage -//usage: "[HOST] [SERVER]" +//usage: IF_FEATURE_NSLOOKUP_BIG("[-type=QUERY_TYPE] ") "HOST [DNS_SERVER]" //usage:#define nslookup_full_usage "\n\n" -//usage: "Query the nameserver for the IP address of the given HOST\n" -//usage: "optionally using a specified DNS server" +//usage: "Query DNS about HOST" //usage: //usage:#define nslookup_example_usage //usage: "$ nslookup localhost\n" @@ -42,7 +41,7 @@ #include "common_bufsiz.h" -#if !ENABLE_NSLOOKUP_BIG +#if !ENABLE_FEATURE_NSLOOKUP_BIG /* * Mini nslookup implementation for busybox @@ -326,7 +325,7 @@ struct globals { } while (0) enum { - OPT_stats = (1 << 4), + OPT_stats = (1 << 0), }; static int parse_reply(const unsigned char *msg, size_t len) @@ -687,7 +686,7 @@ static void add_ns(const char *addr) G.server = xrealloc_vector(G.server, /*8=2^3:*/ 3, count); ns = &G.server[count]; ns->name = addr; - ns->lsa = xhost2sockaddr(addr, 53); + ns->lsa = xhost2sockaddr(addr, G.default_port); /*ns->replies = 0; - already is */ /*ns->failures = 0; - already is */ } @@ -747,107 +746,130 @@ int nslookup_main(int argc UNUSED_PARAM, char **argv) { struct ns *ns; struct query *queries; - llist_t *type_strings; int n_queries; unsigned types; - int opts; int rc; int err; INIT_G(); - type_strings = NULL; -#if ENABLE_FEATURE_NSLOOKUP_LONG_OPTIONS - opts = getopt32long(argv, "^" - "+" /* '+': stop at first non-option (why?) */ - "q:*p:+r:+t:+s" - "\0" - "-1:q::", /* minimum 1 arg, -q is a list */ - "type\0" Required_argument "q" - "querytype\0" Required_argument "q" - "port\0" Required_argument "p" - "retry\0" Required_argument "r" - "timeout\0" Required_argument "t" - "stats\0" No_argument "s", - &type_strings, &G.default_port, - &G.default_retry, &G.default_timeout - ); -#else - opts = getopt32(argv, "^" - "+" /* '+': stop at first non-option (why?) */ - "q:*p:+r:+t:+s" - "\0" - "-1:q::", /* minimum 1 arg, -q is a list */ - &type_strings, &G.default_port, - &G.default_retry, &G.default_timeout - ); -#endif - if (G.default_port > 65535) - bb_error_msg_and_die("invalid server port"); - if (G.default_retry == 0) - bb_error_msg_and_die("invalid retry value"); - if (G.default_timeout == 0) - bb_error_msg_and_die("invalid timeout value"); - + /* manpage: "Options can also be specified on the command line + * if they precede the arguments and are prefixed with a hyphen." + */ types = 0; - while (type_strings) { - int c; - char *ptr, *chr; - - ptr = llist_pop(&type_strings); - - /* skip leading text, e.g. when invoked with -querytype=AAAA */ - chr = strchr(ptr, '='); - if (chr) - ptr = chr + 1; + argv++; + for (;;) { + const char *options = +// bind-utils-9.11.3 accept these: +// class= cl= +// type= ty= querytype= query= qu= q= +// domain= do= +// port= po= +// timeout= t= +// retry= ret= +// ndots= +// recurse +// norecurse +// defname +// nodefname +// vc +// novc +// debug +// nodebug +// d2 +// nod2 +// search +// nosearch +// sil +// fail +// nofail +// ver (prints version and exits) + "type\0" /* 0 */ + "querytype\0" /* 1 */ + "port\0" /* 2 */ + "retry\0" /* 3 */ + "stats\0" /* 4 */ + "t\0" /* disambiguate with "type": else -t=2 fails */ + "timeout\0" /* 6 */ + ""; + int i; + char *arg; + char *val; + + if (!*argv) + bb_show_usage(); + if (argv[0][0] != '-') + break; - for (c = 0;; c++) { - if (c == ARRAY_SIZE(qtypes)) - bb_error_msg_and_die("invalid query type \"%s\"", ptr); - if (strcmp(qtypes[c].name, ptr) == 0) - break; + /* Separate out "=val" part */ + arg = (*argv++) + 1; + val = strchrnul(arg, '='); + if (*val) + *val++ = '\0'; + + i = index_in_substrings(options, arg); + //bb_error_msg("i:%d arg:'%s' val:'%s'", i, arg, val); + if (i < 0) + bb_show_usage(); + + if (i <= 1) { + for (i = 0;; i++) { + if (i == ARRAY_SIZE(qtypes)) + bb_error_msg_and_die("invalid query type \"%s\"", val); + if (strcmp(qtypes[i].name, val) == 0) + break; + } + types |= (1 << i); + continue; + } + if (i == 2) { + G.default_port = xatou_range(val, 1, 0xffff); + } + if (i == 3) { + G.default_retry = xatou_range(val, 1, INT_MAX); + } + if (i == 4) { + option_mask32 |= OPT_stats; + } + if (i > 4) { + G.default_timeout = xatou_range(val, 1, INT_MAX / 1000); } - - types |= (1 << c); } - argv += optind; - n_queries = 0; queries = NULL; - do { - if (types == 0) { - /* No explicit type given, guess query type. - * If we can convert the domain argument into a ptr (means that - * inet_pton() could read it) we assume a PTR request, else - * we issue A+AAAA queries and switch to an output format - * mimicking the one of the traditional nslookup applet. - */ - char *ptr; - char buf80[80]; - - ptr = make_ptr(buf80, *argv); - if (ptr) { - add_query(&queries, &n_queries, T_PTR, xstrdup(ptr)); - } else { - add_query(&queries, &n_queries, T_A, *argv); + if (types == 0) { + /* No explicit type given, guess query type. + * If we can convert the domain argument into a ptr (means that + * inet_pton() could read it) we assume a PTR request, else + * we issue A+AAAA queries and switch to an output format + * mimicking the one of the traditional nslookup applet. + */ + char *ptr; + char buf80[80]; + + ptr = make_ptr(buf80, argv[0]); + if (ptr) { + add_query(&queries, &n_queries, T_PTR, xstrdup(ptr)); + } else { + add_query(&queries, &n_queries, T_A, argv[0]); #if ENABLE_FEATURE_IPV6 - add_query(&queries, &n_queries, T_AAAA, *argv); + add_query(&queries, &n_queries, T_AAAA, argv[0]); #endif - } - } else { - int c; - for (c = 0; c < ARRAY_SIZE(qtypes); c++) { - if (types & (1 << c)) - add_query(&queries, &n_queries, qtypes[c].type, *argv); - } } - argv++; - } while (argv[0] && argv[1]); + } else { + int c; + for (c = 0; c < ARRAY_SIZE(qtypes); c++) { + if (types & (1 << c)) + add_query(&queries, &n_queries, qtypes[c].type, argv[0]); + } + } /* Use given DNS server if present */ - if (argv[0]) { - add_ns(argv[0]); + if (argv[1]) { + if (argv[2]) + bb_show_usage(); + add_ns(argv[1]); } else { parse_resolvconf(); /* Fall back to localhost if we could not find NS in resolv.conf */ @@ -861,7 +883,7 @@ int nslookup_main(int argc UNUSED_PARAM, char **argv) c = send_queries(&G.server[rc], queries, n_queries); if (c > 0) { /* more than zero replies received */ - if (opts & OPT_stats) { + if (option_mask32 & OPT_stats) { printf("Replies:\t%d\n", G.server[rc].replies); printf("Failures:\t%d\n\n", G.server[rc].failures); } |