March 2018 - connman - Ml01.01.Org

ConnMan sometimes shutting down, sometimes not restarting

by Craig McQueen

I'm using ConnMan in an ARM embedded Linux system (based on BeagleBone Black). For a long time, with systems using Linux kernel 3.14.x and 4.4.x, it has been working very well. Recently, I have done some work to upgrade to Linux kernel 4.9.x. With this kernel, ConnMan sometimes terminates and restarts shortly after start-up, something that I don't think it did before. At least, I think the change is related to the kernel upgrade. The system has also had other upgrades to other components, but the kernel update seems like the most likely cause. Examining recent system logs, I see this message appears shortly before a ConnMan restart: Jan 29 17:25:34 wt000043 daemon.err connmand[19746]: Inconsistent IP pool management (start not found) Shortly after that message, ConnMan shuts down. Usually it restarts, and everything is fine. But occasionally, ConnMan never restarts, and the system has no network connectivity. What might be a cause for this error? I see in the source code, function __connman_ippool_deladdr() contains: info = lookup_info(index, start); if (!info) { /* In theory this should never happen */ connman_error("Inconsistent IP pool management (start not found)"); return; } -- Craig McQueen

2 years, 8 months

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why connman uses built-in functions for atomic memory access

by Vasyl Vavrychuk

Hi, As far as I understand connman is single-threaded but then why it has to use built-in functions for atomic memory access such as __sync_synchronize, __sync_fetch_and_sub, etc. Thanks, Vasyl

2 years, 8 months

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Static Address for Ethernet interface

by Eswaran Vinothkumar (BEG/PJ-IOT-EL)

Hi, I am using Connman in one of our internal IOT project. Connman version:1.35 The hardware I am using has two Ethernet interfaces. To set up the static IP I run the following commands: 'connmanctl config ethernet_0001c01e6612_cable --ipv4 manual 192.168.1.40 255.255.255.0 192.168.0.1 --ipv6 off' 'connmanctl config ethernet_0001c01e6621_cable --ipv4 manual 192.168.1.45 255.255.255.0 192.168.0.1 --ipv6 off' This works without any problems and I can see the IP addresses being set as requested. For the project I will be using 50 or more hardwares and manually setting IP for every hardware is bit annoying. It becomes more complicated when I use over the air software updates. Manual interruption is required everytime after software update to set up the static IP. Is there any config available within connman to set up the static IP for Ethernet inerfaces? I have looked into the connman-config documents and found out that I can set up the static IP by using a config file. [service_ethernet] Type = ethernet IPv4 = 192.168.1.40/255.255.255.0/192.168.1.1 IPv6 = off I purposefully omitted the MAC address because the addresses will be unique for each hardware. But using this sets up the same IP address for both the Ethernet interfaces. Is there any way to setup static IP without using MAC address in Connman? Any other proposal to solve the problem will also be helpful. Mit freundlichen Grüßen / Best regards Vinothkumar Eswaran BEG-PT/PJ-EL

2 years, 8 months

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[PATCH 0/1] Configure flag for disabling stats file generation

by Chris Novakovic

In August 2016, Feng Wang posted a patch that allowed the generation of interface statistics files to be disabled at compile-time. It was never merged, but I rediscovered it recently and realised it'd be useful to have a way to stop those files from being generated on embedded systems, where file systems are often on flash storage (putting writes at a premium) and the interface stats themselves might not even be needed. This is Feng's patch from 2016, cleaned up and updated for the current master branch. Chris Novakovic (1): build: Add --disable-stats option Makefile.am | 4 ++++ configure.ac | 5 +++++ src/stats.c | 36 ++++++++++++++++++++++++++++++++++++ 3 files changed, 45 insertions(+) -- 2.14.1

2 years, 8 months

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connman does not see any wifi carriers after cycling hardware rfkill button

by KARBOWSKI Piotr

Hi, It appears that the momment I double tap fn+print screen (rfkill) hotkey (so, block followed by unblock), connman looses wifi support until restart. If I try to force scan via `scan wifi`, I get: connmanctl> scan wifi Error /net/connman/technology/wifi: No carrier I can confirm that `rfkill` reports all as unblocked. Any suggestion how can I make connman recovery after such event? -- Piotr.

2 years, 8 months

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Ofono LTE modems and connman services

by Jonas Bonn

The following issue is causing us some grief and I really need some guidance on how to approach this. This is being sent to both the ofono and connman mailing lists because it's not really clear to me who's doing the right/wrong thing here... The connman ofono plugin does the following: i) It powers up (enables) the modem ii) If cellular tech is enabled, it brings the modem online For an LTE-modem, this second step results in a default bearer being attached and thereby the modem is 'connected'. The third connman step, setting the ofono context to Active, is not required for LTE; the context becomes 'Active=true' right away. The above effectively means that it's not possible to have an LTE modem that does not auto-connect (in connman terms). Now the APN that ofono sets on the LTE context is 'automatic'; that was selected because connman _requires_ some APN or else it ignores the context altogther. If the modem roams away from LTE connectivity and wants to fallback to UMTS/GSM, it needs another context with a valid APN. So now the modem has two 'internet' contexts ('automatic' and APN) which connman presents as two distinct services. These two services, as far as I can tell, end up competing with each other when connecting and a mess ensues... if the lower numbered context is the 3G context, connman goes into an endless loop attempting to set it Active and continuously failing when the tech switches to LTE. The question is, what are the expectations here: i) What does it mean for connman to see two 'internet' contexts since it sets up two services for them? ii) How is a modem supposed to roam between LTE and UMTS/GSM networks when one requires an APN and the other does not. iii) Not auto-connecting an LTE modem means not bringing it online; what implications does this have for connman? The above is currently a bit of a confusing mess and both ofono and connman get themselves tied in a knot when the modem switches between LTE and non-LTE techs. Any guidance on how to approach this would be appreciated. Thanks, Jonas

2 years, 8 months

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Default Gateway

by Vasiu Alexandru

Hi, I have *2 PCs *with the following set-up: - both have 2 interfaces: eth0 and eth1 *PC 1: * - Not connected to network - Has a *DHCP* Server with gives private IPs from 192.168.2.0/24 - Is connected to *PC 2 *through eth0 (eth0 PC 1 to eth0 PC 2) *PC 2:* - eth0 has IP from *DHCP* Server from *PC 1* - eth1 has IP from an intern network (also private, 10. ...) If I run "ip route show" on PC 2, it shows *2 default gateways* (one for eth0 and one for eth1) on *Ubuntu* and on a distribution with *connman*, it shows just *one default gateway *(eth 1). Questions: 1. Which is the normal behavior? 2. If both interfaces have different IPs from the same network there should be only one default gateway or one for each interface (with the same value)? Thank you, Alexandru Vasiu NI

2 years, 8 months

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[PATCH] reduce noisy error when we try to provision hidden service from config file

by Vasyl Vavrychuk

Before this change upon every scan of the hidden service we got "Network SSID not set" error in logs. This is because hidden services have no WiFi.SSID set. Changed function is try_provision_service from config file and of course we can not do this for hidden services without SSID so we can report ENOENT for them. --- src/config.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/src/config.c b/src/config.c index 1f1ba11b..4178ea86 100644 --- a/src/config.c +++ b/src/config.c @@ -1218,10 +1218,8 @@ static int try_provision_service(struct connman_config_service *config, ssid = connman_network_get_blob(network, "WiFi.SSID", &ssid_len); - if (!ssid) { - connman_error("Network SSID not set"); - return -EINVAL; - } + if (!ssid) + return -ENOENT; if (!config->ssid || ssid_len != config->ssid_len) return -ENOENT; -- 2.11.0

2 years, 8 months

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[PATCH] fixed Connect OperationAborted if it was issued during some moment of autoscan

by Vasyl Vavrychuk

Suppose there is Wi-Fi network X that is saved in connman. Consider the following scenario: 1. Autoscan is started by connman. 2. Network X will be marked as unavailable as result of connman_device_set_scanning(true). 3. Application issue connect to network X. 4. Connect to X starts and interface_state(G_SUPPLICANT_STATE_AUTHENTICATING) is received. 5. As result of this stop_autoscan > connman_device_set_scanning(false) > __connman_device_cleanup_networks is issued that free_network X because it was marked as unavailable. 6. It leads to network_remove > __connman_service_remove_from_network > connman_service_unref_debug > __connman_service_disconnect > ... reply_pending(ECONNABORTED) --- src/device.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/device.c b/src/device.c index 7c212c10..5d343ae8 100644 --- a/src/device.c +++ b/src/device.c @@ -706,7 +706,8 @@ static gboolean remove_unavailable_network(gpointer key, gpointer value, { struct connman_network *network = value; - if (connman_network_get_connected(network)) + if (connman_network_get_connected(network) || + connman_network_get_connecting(network)) return FALSE; if (connman_network_get_available(network)) -- 2.11.0

2 years, 8 months

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[PATCH] supplicant: fixed return value of ssid getter

by Vasyl Vavrychuk

Previously for network without SSID g_supplicant_network_get_ssid returned pointer to empty string. Then some naive users of it treated such value as a valid SSID. This fixes "Network SSID is not set" for hidden networks. --- gsupplicant/supplicant.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gsupplicant/supplicant.c b/gsupplicant/supplicant.c index 5246c80b..ec2f4307 100644 --- a/gsupplicant/supplicant.c +++ b/gsupplicant/supplicant.c @@ -1189,7 +1189,7 @@ const char *g_supplicant_network_get_security(GSupplicantNetwork *network) const void *g_supplicant_network_get_ssid(GSupplicantNetwork *network, unsigned int *ssid_len) { - if (!network) { + if (!network || !network->ssid_len) { *ssid_len = 0; return NULL; } -- 2.11.0

2 years, 9 months

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connman March 2018