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new: ability to filter by a node when fetching K8S metadata

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Signed-off-by: Leonardo Grasso <me@leonardograsso.com>
This commit is contained in:
Leonardo Grasso
2021-06-09 16:38:07 +02:00
committed by poiana
parent af0e6da375
commit 2390ca447a
1 changed files with 16 additions and 2 deletions
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18
userspace/falco/falco.cpp
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@@ -123,6 +123,9 @@ static void usage()
" for this option, it will be interpreted as the name of a file containing bearer token.\n"
" Note that the format of this command-line option prohibits use of files whose names contain\n"
" ':' or '#' characters in the file name.\n"
" --k8s-node <node_name> The node name will be used as a filter when requesting metadata of pods to the API server.\n"
" Usually, it should be set to the current node on which Falco is running.\n"
" If empty, no filter is set, which may have a performance penalty on large clusters.\n"
#endif
" -L Show the name and description of all rules and exit.\n"
" -l <rule> Show the name and description of the rule with name <rule> and exit.\n"
@@ -469,6 +472,7 @@ int falco_init(int argc, char **argv)
#ifndef MINIMAL_BUILD
string* k8s_api = 0;
string* k8s_api_cert = 0;
string *k8s_node_name = 0;
string* mesos_api = 0;
#endif
string output_format = "";
@@ -517,6 +521,7 @@ int falco_init(int argc, char **argv)
{"ignored-events", no_argument, 0, 'i'},
{"k8s-api-cert", required_argument, 0, 'K'},
{"k8s-api", required_argument, 0, 'k'},
{"k8s-node", required_argument, 0},
{"list", optional_argument, 0},
{"mesos-api", required_argument, 0, 'm'},
{"option", required_argument, 0, 'o'},
@@ -693,6 +698,15 @@ int falco_init(int argc, char **argv)
{
cri_async = false;
}
#ifndef MINIMAL_BUILD
else if(string(long_options[long_index].name) == "k8s-node")
{
k8s_node_name = new string(optarg);
if (k8s_node_name->size() == 0) {
throw std::invalid_argument("If --k8s-node is provided, it cannot be an empty string");
}
}
#endif
else if (string(long_options[long_index].name) == "list")
{
list_flds = true;
@@ -1249,7 +1263,7 @@ int falco_init(int argc, char **argv)
k8s_api_cert = new string(k8s_cert_env);
}
}
inspector->init_k8s_client(k8s_api, k8s_api_cert, verbose);
inspector->init_k8s_client(k8s_api, k8s_api_cert, k8s_node_name, verbose);
k8s_api = 0;
k8s_api_cert = 0;
}
@@ -1265,7 +1279,7 @@ int falco_init(int argc, char **argv)
}
}
k8s_api = new string(k8s_api_env);
inspector->init_k8s_client(k8s_api, k8s_api_cert, verbose);
inspector->init_k8s_client(k8s_api, k8s_api_cert, k8s_node_name, verbose);
}
else
{