[MEDIUM] checks: add support for HTTP contents lookup
This patch adds the "http-check expect [r]{string,status}" statements
which enable health checks based on whether the response status or body
to an HTTP request contains a string or matches a regex.
This probably is one of the oldest patches that remained unmerged. Over
the time, several people have contributed to it, among which FinalBSD
(first and second implementations), Nick Chalk (port to 1.4), Anze
Skerlavaj (tests and fixes), Cyril Bonté (general fixes), and of course
myself for the final fixes and doc during integration.
Some people already use an old version of this patch which has several
issues, among which the inability to search for a plain string that is
not at the beginning of the data, and the inability to look for response
contents that are provided in a second and subsequent recv() calls. But
since some configs are already deployed, it was quite important to ensure
a 100% compatible behaviour on the working cases.
Thus, that patch fixes the issues while maintaining config compatibility
with already deployed versions.
(cherry picked from commit b507c43a3ce9a8e8e4b770e52e4edc20cba4c37f)
diff --git a/include/types/proxy.h b/include/types/proxy.h
index f28bc40..46b61a2 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -140,6 +140,14 @@
#define PR_O2_SSL3_CHK 0x00100000 /* use SSLv3 CLIENT_HELLO packets for server health */
#define PR_O2_FAKE_KA 0x00200000 /* pretend we do keep-alive with server eventhough we close */
#define PR_O2_LDAP_CHK 0x00400000 /* use LDAP check for server health */
+
+#define PR_O2_EXP_NONE 0x00000000 /* http-check : no expect rule */
+#define PR_O2_EXP_STS 0x00800000 /* http-check expect status */
+#define PR_O2_EXP_RSTS 0x01000000 /* http-check expect rstatus */
+#define PR_O2_EXP_STR 0x01800000 /* http-check expect string */
+#define PR_O2_EXP_RSTR 0x02000000 /* http-check expect rstring */
+#define PR_O2_EXP_TYPE 0x03800000 /* mask for http-check expect type */
+#define PR_O2_EXP_INV 0x04000000 /* http-check expect !<rule> */
/* end of proxy->options2 */
/* bits for sticking rules */
@@ -283,6 +291,8 @@
int grace; /* grace time after stop request */
char *check_req; /* HTTP or SSL request to use for PR_O_HTTP_CHK|PR_O_SSL3_CHK */
int check_len; /* Length of the HTTP or SSL3 request */
+ char *expect_str; /* http-check expected content */
+ regex_t *expect_regex; /* http-check expected content */
struct chunk errmsg[HTTP_ERR_SIZE]; /* default or customized error messages for known errors */
int uuid; /* universally unique proxy ID, used for SNMP */
unsigned int backlog; /* force the frontend's listen backlog */