Aleksandar - thanks for the feedback ! (haproxy -vv : attached) I'd spent a good long while scouring the config docs (and Google) seeking enlightenment, but ... No joy using either of '! -m found -m int 0' or '! -m found'.
Here's hoping someone/anyone else has experience making an empty field() work ... On Mon, Apr 17, 2023 at 5:29 PM Aleksandar Lazic <[email protected]> wrote: > Hi. > > On 18.04.23 00:55, Jim Freeman wrote: > > In splitting out fields from req.cook, populated fields work well, but > > detecting an unset field has me befuddled: > > > > acl COOK_META_MISSING req.cook(cook2hdr),field(3,\#) ! -m found -m > str '' > > > > does not detect that a cookie/field is empty ? > > > > Running the attached 'hdrs' script against the attached haproxy.cfg sees > : > > === > > ... > > cookie: cook2hdr=##### > > bar: bar > > baz: baz > > meta: ,bar,baz > > foo: > > === > > when foo: should not be created, and meta: should only have 2 fields. > > > > Am I just getting the idiom/incantation wrong ? > > > > [ stock/current haproxy 2.6 from Debian/Ubuntu LTS backports ] > > A `haproxy -vv` is better then guessing which version this is :-) > > Looks like the doc does not mention the empty field case. > > https://docs.haproxy.org/2.6/configuration.html#7.3.1-field > > From the code looks like that the data is set to 0 > https://github.com/haproxy/haproxy/blob/master/src/sample.c#L2432 > > I would just try to make a '! -m found' but that's untested, I'm pretty > sure that some persons on this list have much more experience with empty > return values test. > > Regards > Alex >
$ /usr/sbin/haproxy -vv HAProxy version 2.6.9-1~bpo11+1 2023/02/15 - https://haproxy.org/ Status: long-term supported branch - will stop receiving fixes around Q2 2027. Known bugs: http://www.haproxy.org/bugs/bugs-2.6.9.html Running on: Linux 5.10.0-21-cloud-amd64 #1 SMP Debian 5.10.162-1 (2023-01-21) x86_64 Build options : TARGET = linux-glibc CPU = generic CC = cc CFLAGS = -O2 -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wundef -Wdeclaration-after-statement -Wfatal-errors -Wtype-limits -Wshift-negative-value -Wshift-overflow=2 -Wduplicated-cond -Wnull-dereference -fwrapv -Wno-address-of-packed-member -Wno-unused-label -Wno-sign-compare -Wno-unused-parameter -Wno-clobbered -Wno-missing-field-initializers -Wno-cast-function-type -Wno-string-plus-int -Wno-atomic-alignment OPTIONS = USE_PCRE2=1 USE_PCRE2_JIT=1 USE_OPENSSL=1 USE_LUA=1 USE_SLZ=1 USE_SYSTEMD=1 USE_PROMEX=1 DEBUG = -DDEBUG_STRICT -DDEBUG_MEMORY_POOLS Feature list : -51DEGREES +ACCEPT4 +BACKTRACE -CLOSEFROM +CPU_AFFINITY +CRYPT_H -DEVICEATLAS +DL -ENGINE +EPOLL -EVPORTS +GETADDRINFO -KQUEUE +LIBCRYPT +LINUX_SPLICE +LINUX_TPROXY +LUA -MEMORY_PROFILING +NETFILTER +NS -OBSOLETE_LINKER +OPENSSL -OT -PCRE +PCRE2 +PCRE2_JIT -PCRE_JIT +POLL +PRCTL -PROCCTL +PROMEX -QUIC +RT +SLZ -STATIC_PCRE -STATIC_PCRE2 +SYSTEMD +TFO +THREAD +THREAD_DUMP +TPROXY -WURFL -ZLIB Default settings : bufsize = 16384, maxrewrite = 1024, maxpollevents = 200 Built with multi-threading support (MAX_THREADS=64, default=2). Built with OpenSSL version : OpenSSL 1.1.1n 15 Mar 2022 Running on OpenSSL version : OpenSSL 1.1.1n 15 Mar 2022 OpenSSL library supports TLS extensions : yes OpenSSL library supports SNI : yes OpenSSL library supports : TLSv1.0 TLSv1.1 TLSv1.2 TLSv1.3 Built with Lua version : Lua 5.3.3 Built with the Prometheus exporter as a service Built with network namespace support. Support for malloc_trim() is enabled. Built with libslz for stateless compression. Compression algorithms supported : identity("identity"), deflate("deflate"), raw-deflate("deflate"), gzip("gzip") Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND Built with PCRE2 version : 10.36 2020-12-04 PCRE2 library supports JIT : yes Encrypted password support via crypt(3): yes Built with gcc compiler version 10.2.1 20210110 Available polling systems : epoll : pref=300, test result OK poll : pref=200, test result OK select : pref=150, test result OK Total: 3 (3 usable), will use epoll. Available multiplexer protocols : (protocols marked as <default> cannot be specified using 'proto' keyword) h2 : mode=HTTP side=FE|BE mux=H2 flags=HTX|HOL_RISK|NO_UPG fcgi : mode=HTTP side=BE mux=FCGI flags=HTX|HOL_RISK|NO_UPG <default> : mode=HTTP side=FE|BE mux=H1 flags=HTX h1 : mode=HTTP side=FE|BE mux=H1 flags=HTX|NO_UPG <default> : mode=TCP side=FE|BE mux=PASS flags= none : mode=TCP side=FE|BE mux=PASS flags=NO_UPG Available services : prometheus-exporter Available filters : [CACHE] cache [COMP] compression [FCGI] fcgi-app [SPOE] spoe [TRACE] trace
$ /usr/sbin/haproxy -vv HAProxy version 2.6.12-1ppa1~jammy 2023/04/01 - https://haproxy.org/ Status: long-term supported branch - will stop receiving fixes around Q2 2027. Known bugs: http://www.haproxy.org/bugs/bugs-2.6.12.html Running on: Linux 5.19.0-38-generic #39~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 17 21:16:15 UTC 2 x86_64 Build options : TARGET = linux-glibc CPU = generic CC = cc CFLAGS = -O2 -g -O2 -flto=auto -ffat-lto-objects -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wundef -Wdeclaration-after-statement -Wfatal-errors -Wtype-limits -Wshift-negative-value -Wshift-overflow=2 -Wduplicated-cond -Wnull-dereference -fwrapv -Wno-address-of-packed-member -Wno-unused-label -Wno-sign-compare -Wno-unused-parameter -Wno-clobbered -Wno-missing-field-initializers -Wno-cast-function-type -Wno-string-plus-int -Wno-atomic-alignment OPTIONS = USE_PCRE2=1 USE_PCRE2_JIT=1 USE_OPENSSL=1 USE_LUA=1 USE_SLZ=1 USE_SYSTEMD=1 USE_OT=1 USE_PROMEX=1 DEBUG = -DDEBUG_STRICT -DDEBUG_MEMORY_POOLS Feature list : -51DEGREES +ACCEPT4 +BACKTRACE -CLOSEFROM +CPU_AFFINITY +CRYPT_H -DEVICEATLAS +DL -ENGINE +EPOLL -EVPORTS +GETADDRINFO -KQUEUE +LIBCRYPT +LINUX_SPLICE +LINUX_TPROXY +LUA -MEMORY_PROFILING +NETFILTER +NS -OBSOLETE_LINKER +OPENSSL +OT -PCRE +PCRE2 +PCRE2_JIT -PCRE_JIT +POLL +PRCTL -PROCCTL +PROMEX -QUIC +RT +SLZ -STATIC_PCRE -STATIC_PCRE2 +SYSTEMD +TFO +THREAD +THREAD_DUMP +TPROXY -WURFL -ZLIB Default settings : bufsize = 16384, maxrewrite = 1024, maxpollevents = 200 Built with multi-threading support (MAX_THREADS=64, default=12). Built with OpenSSL version : OpenSSL 3.0.2 15 Mar 2022 Running on OpenSSL version : OpenSSL 3.0.2 15 Mar 2022 OpenSSL library supports TLS extensions : yes OpenSSL library supports SNI : yes OpenSSL library supports : TLSv1.0 TLSv1.1 TLSv1.2 TLSv1.3 OpenSSL providers loaded : default Built with Lua version : Lua 5.3.6 Built with the Prometheus exporter as a service Built with network namespace support. Built with OpenTracing support. Support for malloc_trim() is enabled. Built with libslz for stateless compression. Compression algorithms supported : identity("identity"), deflate("deflate"), raw-deflate("deflate"), gzip("gzip") Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND Built with PCRE2 version : 10.39 2021-10-29 PCRE2 library supports JIT : yes Encrypted password support via crypt(3): yes Built with gcc compiler version 11.3.0 Available polling systems : epoll : pref=300, test result OK poll : pref=200, test result OK select : pref=150, test result OK Total: 3 (3 usable), will use epoll. Available multiplexer protocols : (protocols marked as <default> cannot be specified using 'proto' keyword) h2 : mode=HTTP side=FE|BE mux=H2 flags=HTX|HOL_RISK|NO_UPG fcgi : mode=HTTP side=BE mux=FCGI flags=HTX|HOL_RISK|NO_UPG h1 : mode=HTTP side=FE|BE mux=H1 flags=HTX|NO_UPG <default> : mode=HTTP side=FE|BE mux=H1 flags=HTX none : mode=TCP side=FE|BE mux=PASS flags=NO_UPG <default> : mode=TCP side=FE|BE mux=PASS flags= Available services : prometheus-exporter Available filters : [CACHE] cache [COMP] compression [FCGI] fcgi-app [ OT] opentracing [SPOE] spoe [TRACE] trace
