tools: refine help (#481)

fix invalid help options and documentation typos

Fix By: @lifenjoiner

docs/acountry.1

@@ -17,7 +17,7 @@ This utility comes with the \fBc\-ares\fR asynchronous resolver library.
 \fB\-d\fR
 Print some extra debugging output.
 .TP
-\fB\-h\fR, \fB\-\-help\fR
+\fB\-h\fR, \fB\-?\fR
 Display this help and exit.
 .TP
 \fB\-v\fR

docs/adig.1

@@ -18,34 +18,40 @@ This utility comes with the \fBc\-ares\fR asynchronous resolver library.
 \fB\-c\fR class
 Set the query class.
 Possible values for class are
-NY, CHAOS, HS, IN (default).
+ANY, CHAOS, HS and IN (default).
 .TP
 \fB\-d\fR
 Print some extra debugging output.
 .TP
 \fB\-f\fR flag
-Add a flag.
+Add a behavior control flag.
 Possible values for flag are
-igntc, noaliases, norecurse, primary, stayopen, usevc.
+ igntc - ignore to query in TCP to get truncated UDP answer,
+ noaliases - don't honor the HOSTALIASES environment variable,
+ norecurse - don't query upstream servers recursively,
+ primary - use the first server,
+ stayopen - don't close the communication sockets, and
+ usevc - always use TCP.
 .TP
-\fB\-h\fR, \fB\-\-help\fR
+\fB\-h\fR, \fB\-?\fR
 Display this help and exit.
 .TP
-\fB\-T\fR port
-Use specified TCP port to connect to DNS server.
-.TP
 \fB\-s\fR server
 Connect to specified DNS server, instead of the system's default one(s).
+Servers are tried in round-robin, if the previous one failed.
 .TP
 \fB\-t\fR type
 Query records of specified type.
 Possible values for type are
 A (default), AAAA, AFSDB, ANY, AXFR, CNAME, GPOS, HINFO, ISDN, KEY, LOC, MAILA,
 MAILB, MB, MD, MF, MG, MINFO, MR, MX, NAPTR, NS, NSAP, NSAP_PTR, NULL,
-PTR, PX, RP, RT, SIG, SOA, SRV, TXT, URI, WKS, X25,
+PTR, PX, RP, RT, SIG, SOA, SRV, TXT, URI, WKS and X25.
+.TP
+\fB\-T\fR port
+Connect to the specified TCP port of DNS server.
 .TP
 \fB\-U\fR port
-Use specified UDP port to connect to DNS server.
+Connect to the specified UDP port of DNS server.
 .TP
 \fB\-x\fR
 For an IPv4 \fB-t PTR a.b.c.d\fR lookup, query for

docs/ahost.1

@@ -17,7 +17,7 @@ This utility comes with the \fBc\-ares\fR asynchronous resolver library.
 \fB\-d\fR
 Print some extra debugging output.
 .TP
-\fB\-h\fR, \fB\-\-help\fR
+\fB\-h\fR, \fB\-?\fR
 Display this help and exit.
 .TP
 \fB\-t\fR type

src/tools/acountry.c

@@ -644,9 +644,9 @@ static void find_country_from_cname(const char *cname, struct in_addr addr)
 /* Information from the man page. Formatting taken from man -h */
 static void print_help_info_acountry(void) {
     printf("acountry, version %s\n\n", ARES_VERSION_STR);
-    printf("usage: acountry [-hdv] {host|addr} ...\n\n"
-    "  d : Print some extra debugging output.\n"
+    printf("usage: acountry [-hdv] host|addr ...\n\n"
     "  h : Display this help and exit.\n"
+    "  d : Print some extra debugging output.\n"
     "  v : Be more verbose. Print extra information.\n\n");
     exit(0);
 }

src/tools/adig.c

@@ -961,22 +961,26 @@ static void append_addr_list(struct ares_addr_node **head,
 /* Information from the man page. Formatting taken from man -h */
 static void print_help_info_adig(void) {
     printf("adig, version %s\n\n", ARES_VERSION_STR);
-    printf("usage: adig [-h] [-d] [-f flag] [-s server] [-c class] [-t type] [-T|U port] [-x | -xx] name ...\n\n"
-    "  d : Print some extra debugging output.\n"
-    "  f : Add a flag. Possible values for flag are igntc, noaliases, norecurse, primary, stayopen, usevc.\n"
-    "  h : Display this help and exit.\n\n"
-    "  T port   : Use specified TCP port to connect to DNS server.\n"
-    "  U port   : Use specified UDP port to connect to DNS server.\n"
-    "  c class  : Set the query class. Possible values for class are NY, CHAOS, HS, IN  (default).\n"
-    "  s server : Connect to specified DNS server, instead of the system's default one(s).\n"
-    "  t type   : Query records of specified type.  \n"
-    "              Possible values for type are A  \n"
-    "              (default), AAAA, AFSDB,  ANY,\n"
-    "              AXFR, CNAME, GPOS, HINFO, ISDN,\n"
-    "              KEY, LOC, MAILA, MAILB, MB, MD,\n"
-    "              MF, MG, MINFO, MR, MX, NAPTR, NS,\n"
-    "              NSAP, NSAP_PTR, NULL, PTR, PX, RP,\n"
-    "              RT,  SIG,  SOA, SRV, TXT, URI, WKS, X25\n\n"
+    printf("usage: adig [-h] [-d] [-f flag] [[-s server] ...] [-T|U port] [-c class] [-t type] [-x|-xx] name ...\n\n"
+    "  h : Display this help and exit.\n"
+    "  d : Print some extra debugging output.\n\n"
+    "  f flag   : Add a behavior control flag. Possible values are\n"
+    "              igntc - ignore to query in TCP to get truncated UDP answer,\n"
+    "              noaliases - don't honor the HOSTALIASES environment variable,\n"
+    "              norecurse - don't query upstream servers recursively,\n"
+    "              primary - use the first server,\n"
+    "              stayopen - don't close the communication sockets, and\n"
+    "              usevc - use TCP only.\n"
+    "  s server : Connect to the specified DNS server, instead of the system's default one(s).\n"
+    "              Servers are tried in round-robin, if the previous one failed.\n"
+    "  T port   : Connect to the specified TCP port of DNS server.\n"
+    "  U port   : Connect to the specified UDP port of DNS server.\n"
+    "  c class  : Set the query class. Possible values for class are ANY, CHAOS, HS and IN (default)\n"
+    "  t type   : Query records of the specified type.\n"
+    "              Possible values for type are A (default), AAAA, AFSDB, ANY, AXFR,\n"
+    "              CNAME, GPOS, HINFO, ISDN, KEY, LOC, MAILA, MAILB, MB, MD, MF, MG,\n"
+    "              MINFO, MR, MX, NAPTR, NS, NSAP, NSAP_PTR, NULL, PTR, PX, RP, RT,\n"
+    "              SIG, SOA, SRV, TXT, URI, WKS and X25.\n\n"
     " -x  : For a '-t PTR a.b.c.d' lookup, query for 'd.c.b.a.in-addr.arpa.'\n"
     " -xx : As above, but for IPv6, compact the format into a bitstring like\n"
     "       '[xabcdef00000000000000000000000000].IP6.ARPA.'\n");

src/tools/ahost.c

@@ -214,18 +214,15 @@ static void usage(void)
 /* Information from the man page. Formatting taken from man -h */
 static void print_help_info_ahost(void) {
     printf("ahost, version %s\n\n", ARES_VERSION_STR);
-    printf("usage: ahost [-h] [-d] [-s {domain}] [-t {a|aaaa|u}] {host|addr} ...\n\n"
-    "  d : Print some extra debugging output.\n"
-    "  h : Display this help and exit.\n\n"
-    "  s domain : Specify the domain to search instead of \n"
-    "               using the default values from \n"
-    "               /etc/resolv.conf. This option only has an \n"
-    "               effect on platforms that use /etc/resolv.conf\n"
-    "               for DNS configuration; it has no effect on other\n"
-    "               platforms (such as Win32 or Android).\n"
+    printf("usage: ahost [-h] [-d] [[-s domain] ...] [-t a|aaaa|u] host|addr ...\n\n"
+    "  h : Display this help and exit.\n"
+    "  d : Print some extra debugging output.\n\n"
+    "  s domain : Specify the domain to search instead of using the default values\n"
+    "               from /etc/resolv.conf. This option only has an effect on\n"
+    "               platforms that use /etc/resolv.conf for DNS configuration;\n"
+    "               it has no effect on other platforms (such as Win32 or Android).\n\n"
     "  t type   : If type is \"a\", print the A record (default).\n"
-    "               If type is \"aaaa\", print the AAAA record.  If\n"
-    "               type is \"u\", look for either AAAA or A record\n"
-    "               (in that order).\n\n");
+    "               If type is \"aaaa\", print the AAAA record.\n"
+    "               If type is \"u\", look for either AAAA or A record (in that order).\n\n");
     exit(0);
 }