== Configuration [[config_paths]] === Config Paths The osmo-gsm-tester looks for configuration files in various standard directories in this order: - '$HOME/.config/osmo-gsm-tester/' - '/usr/local/etc/osmo-gsm-tester/' - '/etc/osmo-gsm-tester/' The config location can also be set by an environment variable '$OSMO_GSM_TESTER_CONF', which then overrides the above locations. The osmo-gsm-tester expects to find the following configuration files in a configuration directory: - 'paths.conf' - 'resources.conf' - 'default-suites.conf' (optional) - 'defaults.conf' (optional) These are described in detail in the following sections. === Format: YAML, and its Drawbacks The general configuration format used is YAML. The stock python YAML parser does have several drawbacks: too many complex possibilities and alternative ways of formatting a configuration, but at the time of writing seems to be the only widely used configuration format that offers a simple and human readable formatting as well as nested structuring. It is recommended to use only the exact YAML subset seen in this manual in case the osmo-gsm-tester should move to a less bloated parser in the future. Careful: if a configuration item consists of digits and starts with a zero, you need to quote it, or it may be interpreted as an octal notation integer! Please avoid using the octal notation on purpose, it is not provided intentionally. [[paths_conf]] === 'paths.conf' The 'paths.conf' file defines where to store the global state (of reserved resources) and where to find suite and scenario definitions. Any relative paths found in a 'paths.conf' file are interpreted as relative to the directory of that 'paths.conf' file. Example: ---- state_dir: '/var/tmp/osmo-gsm-tester/state' suites_dir: '/usr/local/src/osmo-gsm-tester/suites' scenarios_dir: './scenarios' ---- [[state_dir]] ==== 'state_dir' It contains global or system-wide state for osmo-gsm-tester. In a typical state dir you can find the following files: 'last_used_msisdn.state':: Contains last used msisdn number, which is automatically increased every time osmo-gsm-tester needs to assign a new subscriber in a test. 'lock':: Lock file used to implement a mutual exclusion zone around the 'reserved_resources.state' file. 'reserved_resources.state':: File containing a set of reserved resources by any number of osmo-gsm-tester instances. Each osmo-gsm-tester instance is responsible to clear its resources from the list once it is done using them and are no longer reserved. If you would like to set up several separate configurations (not typical), note that the 'state_dir' is used to reserve resources, which only works when all configurations that share resources also use the same 'state_dir'. This way, several concurrent users of osmo-gsm-tester (ie. several osmo-gsm-tester processes running in parallel) can run without interfering with each other (e.g. using same ARFCN, same IP or same ofono modem path). [[suites_dir]] ==== 'suites_dir' Suites contain a set of tests which are designed to be run together to test a set of features given a specific set of resources. As a result, resources are allocated per suite and not per test. Tests for a given suite are located in the form of '.py' python scripts in the same directory where the 'suite.conf' lays. [[scenarios_dir]] ==== 'scenarios_dir' This dir contains scenario configuration files. Scenarios define constraints to serve the resource requests of a 'suite.conf', to select specific resources from the general resource pool specified in 'resources.conf'. All 'times' attributes are expanded before matching. For example, if a 'suite.conf' requests two BTS, we may enforce that both BTS should be of type 'osmo-bts-sysmo' in these ways: ---- resources: bts: - type: osmo-bts-sysmo - type: osmo-bts-sysmo ---- or alternatively, ---- resources: bts: - times: 2 type: osmo-bts-sysmo ---- If only one resource is specified in the scenario, then the resource allocator assumes the restriction is to be applied to the first resource and that remaining resources have no restrictions to be taken into consideration. To apply restrictions only on the second resource, the first element can be left emtpy, like: ---- resources: bts: - {} - type: osmo-bts-sysmo ---- On the 'osmo_gsm_tester.py' command line and the 'default_suites.conf', any number of such scenario configurations can be combined in the form: ---- :[+[+...]] ---- e.g. ---- my_suite:sysmo+tch_f+amr ---- [[resources_conf]] === 'resources.conf' The 'resources.conf' file defines which hardware is connected to the main unit, as well as which limited configuration items (like IP addresses or ARFCNs) should be used. These resources are allocated dynamically and are not configured explicitly: - MSISDN: phone numbers are dealt out to test scripts in sequence on request. A 'resources.conf' is structured as a list of items for each resource type, where each item has one or more settings -- for an example, see <>. These kinds of resource are known: 'ip_address':: List of IP addresses to run osmo-nitb instances on. The main unit typically has a limited number of such IP addresses configured, which the connected BTS models can see on their network. 'addr'::: IPv4 address of the local interface. 'bts':: List of available BTS hardware. 'label'::: human readable label for your own reference 'type'::: which way to launch this BTS, one of - 'osmo-bts-sysmo' - 'osmo-bts-trx' - 'osmo-bts-octphy' - 'ipa-nanobts' 'ipa_unit_id'::: ip.access unit id to be used by the BTS, written into BTS and BSC config. 'addr'::: Remote IP address of the BTS for BTS like sysmoBTS, and local IP address to bind to for locally run BTS such as osmo-bts-trx. 'band'::: GSM band that this BTS shoud use (*TODO*: allow multiple bands). One of: - 'GSM-1800' - 'GSM-1900' - (*TODO*: more bands) 'trx_list'::: Specific TRX configurations for this BTS. There should be as many of these as the BTS has TRXes. (*TODO*: a way to define >1 TRX without special configuration for them.) 'hw_addr':::: Hardware (MAC) address of the TRX in the form of '11:22:33:44:55:66', only used for osmo-bts-octphy. (*TODO*: and nanobts??) 'net_device':::: Local network device to reach the TRX's 'hw_addr' at, only used for osmo-bts-octphy. Example: 'eth0'. 'nominal_power':::: Nominal power to be used by the TRX. 'max_power_red':::: Max power reduction to apply to the nominal power of the TRX. 'arfcn':: List of ARFCNs to use for running BTSes, which defines the actual RF frequency bands used. 'arfcn'::: ARFCN number, see e.g. https://en.wikipedia.org/wiki/Absolute_radio-frequency_channel_number (note that the resource type 'arfcn' contains an item trait also named 'arfcn'). 'band'::: GSM band name to use this ARFCN for, same as for 'bts:band' above. 'modem':: List of modems reachable via ofono and information on the inserted SIM card. (Note: the MSISDN is allocated dynamically in test scripts). 'label'::: Human readable label for your own reference, which also appears in logs. 'path'::: Ofono's path for this modem, like '/modemkind_99'. 'imsi'::: IMSI of the inserted SIM card, like '"123456789012345"'. 'ki'::: 16 byte authentication/encryption KI of the inserted SIM card, in hexadecimal notation (32 characters) like + '"00112233445566778899aabbccddeeff"'. 'auth_algo'::: Authentication algorithm to be used with the SIM card. One of: - 'none' - 'xor' - 'comp128v1' 'ciphers'::: List of ciphers that this modem supports, used to match requirements in suites or scenarios. Any combination of: - 'a5_0' - 'a5_1' - 'a5_2' - 'a5_3' - 'a5_4' - 'a5_5' - 'a5_6' - 'a5_7' 'features'::: List of features that this modem supports, used to match requirements in suites or scenarios. Any combination of: - 'sms' - 'gprs' - 'voice' - 'ussd' Side note: at first sight it might make sense to the reader to rather structure e.g. the 'ip_address' or 'arfcn' configuration as + '"arfcn: GSM-1800: [512, 514, ...]"', + but the more verbose format is chosen to stay consistent with the general structure of resource configurations, which the resource allocation algorithm uses to resolve required resources according to their traits. These configurations look cumbersome because they exhibit only one trait / a trait that is repeated numerous times. No special notation for these cases is available (yet). [[default_suites]] === 'default-suites.conf' (optional) The 'default-suites.conf' file contains a list of 'suite:scenario+scenario+...' combination strings as defined by the 'osmo-gsm-tester.py -s' commandline option. If invoking the 'osmo-gsm-tester.py' without any suite definitions, the '-s' arguments are taken from this file instead. Each of these suite + scenario combinations is run in sequence. A suite name must match the name of a directory in the 'suites_dir' as defined by 'paths.conf'. A scenario name must match the name of a configuration file in the 'scenarios_dir' as defined by 'paths.conf' (optionally without the '.conf' suffix). For 'paths.conf', see <>. Example of a 'default-suites.conf' file: ---- - sms:sysmo - voice:sysmo+tch_f - voice:sysmo+tch_h - voice:sysmo+dyn_ts - sms:trx - voice:trx+tch_f - voice:trx+tch_h - voice:trx+dyn_ts ---- === 'defaults.conf' (optional) Each binary run by osmo-gsm-tester, e.g. 'osmo-nitb' or 'osmo-bts-sysmo', typically has a configuration file template that is populated with values for a trial run. Some of these values are provided by the 'resources.conf' from the allocated resource(s), but not all values can be populated this way: some osmo-nitb configuration values like the network name, encryption algorithm or timeslot channel combinations are in fact not resources (only the nitb's interface address is). These additional settings may be provided by the scenario configurations, but in case the provided scenarios leave some values unset, they are taken from this 'defaults.conf'. (A 'scenario.conf' or a 'resources.conf' providing a similar setting always has precedence over the values given in a 'defaults.conf'). Example of a 'defaults.conf': ---- nitb: net: mcc: 901 mnc: 70 short_name: osmo-gsm-tester-nitb long_name: osmo-gsm-tester-nitb auth_policy: closed encryption: a5_0 bsc: net: mcc: 901 mnc: 70 short_name: osmo-gsm-tester-msc long_name: osmo-gsm-tester-msc auth_policy: closed encryption: a5_0 authentication: optional msc: net: mcc: 901 mnc: 70 short_name: osmo-gsm-tester-msc long_name: osmo-gsm-tester-msc auth_policy: closed encryption: a5_0 authentication: optional bsc_bts: location_area_code: 23 base_station_id_code: 63 stream_id: 255 osmobsc_bts_type: sysmobts trx_list: - nominal_power: 23 max_power_red: 0 arfcn: 868 timeslot_list: - phys_chan_config: CCCH+SDCCH4 - phys_chan_config: SDCCH8 - phys_chan_config: TCH/F_TCH/H_PDCH - phys_chan_config: TCH/F_TCH/H_PDCH - phys_chan_config: TCH/F_TCH/H_PDCH - phys_chan_config: TCH/F_TCH/H_PDCH - phys_chan_config: TCH/F_TCH/H_PDCH - phys_chan_config: TCH/F_TCH/H_PDCH ----