2016-05-12 04:36:12 +08:00
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---
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title: "mg_check_ip_acl()"
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decl_name: "mg_check_ip_acl"
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symbol_kind: "func"
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signature: |
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int mg_check_ip_acl(const char *acl, uint32_t remote_ip);
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---
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2016-07-22 22:13:59 +08:00
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Verifies given IP address against the ACL.
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2016-05-12 04:36:12 +08:00
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`remote_ip` - an IPv4 address to check, in host byte order
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`acl` - a comma separated list of IP subnets: `x.x.x.x/x` or `x.x.x.x`.
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Each subnet is
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prepended by either a - or a + sign. A plus sign means allow, where a
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minus sign means deny. If a subnet mask is omitted, such as `-1.2.3.4`,
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2016-07-22 22:23:11 +08:00
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it means that only that single IP address is denied.
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2016-05-12 04:36:12 +08:00
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Subnet masks may vary from 0 to 32, inclusive. The default setting
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2016-07-22 22:13:59 +08:00
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is to allow all access. On each request the full list is traversed,
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2016-05-12 04:36:12 +08:00
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and the last match wins. Example:
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`-0.0.0.0/0,+192.168/16` - deny all acccesses, only allow 192.168/16 subnet
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2016-07-22 22:13:59 +08:00
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To learn more about subnet masks, see this
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link:https://en.wikipedia.org/wiki/Subnetwork[Wikipedia page on Subnetwork].
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2016-05-12 04:36:12 +08:00
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2016-07-22 22:13:59 +08:00
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Returns -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
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2016-05-12 04:36:12 +08:00
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