3 Apr
2021
3 Apr
'21
7:43 a.m.
### Description
I think something wrong with integer comparison when tested this config file
```
listen=udp:[::1]:5060
listen=udp:127.0.0.1:5060
loadmodule "xlog.so"
loadmodule "sdpops.so"
request_route {
if (sdp_get_address_family() ieq 6 ) {
xlog("L_WARN", "sdp_get_address_family == 6\n");
} else if (sdp_get_address_family() ieq 4) {
xlog("L_WARN", "sdp_get_address_family == 4\n");
} else if (sdp_get_address_family() ieq 1) {
xlog("L_WARN", "cannot detect sdp family\n");
}
}
```
The expected output of IP address type used in SDP. But really I always get "cannot
detect sdp family" message.
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3 Apr
3 Apr
8:25 a.m.
Closed #2701.
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8:25 a.m.
That sdp function returns 4, 6 or -1.
The true for comparing with 1 happens because of how return code for functions is
evaluated: negative values are evaluated to false and positive values are evaluated to
true -- that is something specific for kamailio config interpreter, existing pretty much
from the day 0 of the ser project.
It is documented in core cookbook in the section for return and in the FAQ:
* https://www.kamailio.org/wiki/tutorials/faq/main#how_is_the_function_return…
Where I just added an explicit example for this case. Try the variant with getting the
return value via $rc and if does not work reopen. Also the default config file has a
similar approach for lookup location evaluation.
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8:50 a.m.
Tanks you Daniel for your clarification
I have tested this config
```
listen=udp:[::1]:5060
listen=udp:127.0.0.1:5060
loadmodule "xlog.so"
loadmodule "sdpops.so"
request_route {
if (sdp_get_address_family() && $rc ieq 6 ) {
xlog("L_WARN", "sdp_get_address_family == 6\n");
} else if (sdp_get_address_family() && $rc ieq 4) {
xlog("L_WARN", "sdp_get_address_family == 4 \n");
} else {
xlog("L_WARN", "cannot detect sdp family\n");
}
}
```
Should I update Wiki with another usage example?
```
if (function_returns_four() && $rc ieq 6 ) {
# it doesn't go here
} else if (function_returns_four() && $rc ieq 4) {
# it goes here
}
```
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11:30 a.m.
Adding valid examples to documentation is always welcome.
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1141
days inactive
1141
days old
4 comments
2 participants
participants (2)
-
Daniel-Constantin Mierla -
sergey-safarov