Fix Travis build by disabling tests using IPv6

TravisCI has removed IPv6 support in 2016.  To cope with this regression
in the testing infrastructure, disable all tests on Travis that depend
on the system being able to handle ::1 as an IP address.  Normal unit
testing still uses the full test suite.

.travis.yml

@@ -2,8 +2,7 @@ language: c
 compiler:
   - gcc
   - clang
-script: make && make test && ./sslsplit -V
+script: make && make travis && ./sslsplit -V
 before_install:
   - sudo apt-get update -qq
   - sudo apt-get install -qq libssl-dev libevent-dev check
-  - sudo sh -c 'echo 0 > /proc/sys/net/ipv6/conf/all/disable_ipv6'

GNUmakefile

@@ -397,6 +397,9 @@ endif
 %.o: %.c $(HDRS) GNUmakefile
 	$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
 
+travis: TCPPFLAGS+=-DTRAVIS
+travis: test
+
 test: TCPPFLAGS+=-D"TEST_ZEROUSR=\"$(shell id -u -n root||echo 0)\""
 test: TCPPFLAGS+=-D"TEST_ZEROGRP=\"$(shell id -g -n root||echo 0)\""
 test: $(TARGET).test

opts.t.c

@@ -385,7 +385,9 @@ opts_suite(void)
 
 	tc = tcase_create("proxyspec_parse");
 	tcase_add_test(tc, proxyspec_parse_01);
-	tcase_add_test(tc, proxyspec_parse_02);
+#ifndef TRAVIS
+	tcase_add_test(tc, proxyspec_parse_02); /* IPv6 */
+#endif /* TRAVIS */
 	tcase_add_exit_test(tc, proxyspec_parse_03, EXIT_FAILURE);
 	tcase_add_exit_test(tc, proxyspec_parse_04, EXIT_FAILURE);
 	tcase_add_test(tc, proxyspec_parse_05);
@@ -396,8 +398,10 @@ opts_suite(void)
 	tcase_add_exit_test(tc, proxyspec_parse_10, EXIT_FAILURE);
 	tcase_add_test(tc, proxyspec_parse_11);
 	tcase_add_exit_test(tc, proxyspec_parse_12, EXIT_FAILURE);
-	tcase_add_test(tc, proxyspec_parse_13);
-	tcase_add_test(tc, proxyspec_parse_14);
+#ifndef TRAVIS
+	tcase_add_test(tc, proxyspec_parse_13); /* IPv6 */
+	tcase_add_test(tc, proxyspec_parse_14); /* IPv6 */
+#endif /* TRAVIS */
 	suite_add_tcase(s, tc);
 
 	tc = tcase_create("opts_debug");