add function to check server/hostname - gopher-validator - Gopher validator and happy helper
(HTM) git clone git://git.codemadness.org/gopher-validator
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---
(DIR) commit e4a622665300d0c8c5ce1a4fa6608f6733f3c191
(DIR) parent 5ca656215b1e77b7fef4dcf37cd6e429146b9426
(HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Sat, 10 Aug 2019 20:27:37 +0200
add function to check server/hostname
this check is incomplete, but should cover some cases
Diffstat:
M gopher-validator.c | 38 +++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/gopher-validator.c b/gopher-validator.c
@@ -130,6 +130,41 @@ warning(const char *fmt, ...)
}
int
+isvalidserver(const char *s)
+{
+ int colons;
+
+ /* IPv6 */
+ if (*s == '[') {
+ colons = 0;
+ s++;
+ for (; *s; s++) {
+ if (*s == ':')
+ colons++;
+ else if (*s == ']')
+ break;
+ else if (isxdigit((unsigned char)*s))
+ ;
+ else
+ return 0;
+ }
+ if (colons < 2 || *s != ']')
+ return 0;
+ } else {
+ if (!*s)
+ return 0;
+ for (; *s; s++) {
+ if (!isalpha((unsigned char)*s) &&
+ !isdigit((unsigned char)*s) &&
+ *s != '-' && *s != '.')
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+int
edial(const char *host, const char *port)
{
struct addrinfo hints, *res, *res0;
@@ -312,6 +347,9 @@ checkdir(FILE *fp)
}
}
+ if (!isvalidserver(v.server))
+ error("%zu: invalid server: %s\n", linenr, v.server);
+
/* check port, must be numeric and in range, port 0 is allowed:
"Appendix:
Note: Port corresponds the the TCP Port Number, its value should