pax_global_header00006660000000000000000000000064144553453660014531gustar00rootroot0000000000000052 comment=3240ed4d74fef0647c8cd801a1beb6e855a02628 gnss-share-0.7.2/000077500000000000000000000000001445534536600136115ustar00rootroot00000000000000gnss-share-0.7.2/.gitignore000066400000000000000000000000341445534536600155760ustar00rootroot00000000000000*.5 *.1 /gnss-share /stmctl gnss-share-0.7.2/.gitlab-ci.yml000066400000000000000000000015361445534536600162520ustar00rootroot00000000000000--- # global settings image: alpine:edge stages: - build # defaults for "only" # We need to run the CI jobs in a "merge request specific context", if CI is # running in a merge request. Otherwise the environment variable that holds the # merge request ID is not available. This means, we must set the "only" # variable accordingly - and if we only do it for one job, all other jobs will # not get executed. So have the defaults here, and use them in all jobs that # should run on both the master branch, and in merge requests. # https://docs.gitlab.com/ee/ci/merge_request_pipelines/index.html#excluding-certain-jobs .only-default: &only-default only: - master - merge_requests - tags build: stage: build <<: *only-default before_script: - apk -q add go staticcheck make script: - make test artifacts: expire_in: 1 week gnss-share-0.7.2/COPYING000066400000000000000000001045131445534536600146500ustar00rootroot00000000000000 GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The GNU General Public License is a free, copyleft license for software and other kinds of works. The licenses for most software and other practical works are designed to take away your freedom to share and change the works. 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If additional permissions apply only to part of the Program, that part may be used separately under those permissions, but the entire Program remains governed by this License without regard to the additional permissions. When you convey a copy of a covered work, you may at your option remove any additional permissions from that copy, or from any part of it. (Additional permissions may be written to require their own removal in certain cases when you modify the work.) You may place additional permissions on material, added by you to a covered work, for which you have or can give appropriate copyright permission. 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Termination. You may not propagate or modify a covered work except as expressly provided under this License. Any attempt otherwise to propagate or modify it is void, and will automatically terminate your rights under this License (including any patent licenses granted under the third paragraph of section 11). However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation. Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice. Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, you do not qualify to receive new licenses for the same material under section 10. 9. Acceptance Not Required for Having Copies. You are not required to accept this License in order to receive or run a copy of the Program. Ancillary propagation of a covered work occurring solely as a consequence of using peer-to-peer transmission to receive a copy likewise does not require acceptance. However, nothing other than this License grants you permission to propagate or modify any covered work. These actions infringe copyright if you do not accept this License. Therefore, by modifying or propagating a covered work, you indicate your acceptance of this License to do so. 10. Automatic Licensing of Downstream Recipients. Each time you convey a covered work, the recipient automatically receives a license from the original licensors, to run, modify and propagate that work, subject to this License. You are not responsible for enforcing compliance by third parties with this License. An "entity transaction" is a transaction transferring control of an organization, or substantially all assets of one, or subdividing an organization, or merging organizations. If propagation of a covered work results from an entity transaction, each party to that transaction who receives a copy of the work also receives whatever licenses to the work the party's predecessor in interest had or could give under the previous paragraph, plus a right to possession of the Corresponding Source of the work from the predecessor in interest, if the predecessor has it or can get it with reasonable efforts. You may not impose any further restrictions on the exercise of the rights granted or affirmed under this License. For example, you may not impose a license fee, royalty, or other charge for exercise of rights granted under this License, and you may not initiate litigation (including a cross-claim or counterclaim in a lawsuit) alleging that any patent claim is infringed by making, using, selling, offering for sale, or importing the Program or any portion of it. 11. Patents. A "contributor" is a copyright holder who authorizes use under this License of the Program or a work on which the Program is based. The work thus licensed is called the contributor's "contributor version". A contributor's "essential patent claims" are all patent claims owned or controlled by the contributor, whether already acquired or hereafter acquired, that would be infringed by some manner, permitted by this License, of making, using, or selling its contributor version, but do not include claims that would be infringed only as a consequence of further modification of the contributor version. For purposes of this definition, "control" includes the right to grant patent sublicenses in a manner consistent with the requirements of this License. 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If, pursuant to or in connection with a single transaction or arrangement, you convey, or propagate by procuring conveyance of, a covered work, and grant a patent license to some of the parties receiving the covered work authorizing them to use, propagate, modify or convey a specific copy of the covered work, then the patent license you grant is automatically extended to all recipients of the covered work and works based on it. A patent license is "discriminatory" if it does not include within the scope of its coverage, prohibits the exercise of, or is conditioned on the non-exercise of one or more of the rights that are specifically granted under this License. You may not convey a covered work if you are a party to an arrangement with a third party that is in the business of distributing software, under which you make payment to the third party based on the extent of your activity of conveying the work, and under which the third party grants, to any of the parties who would receive the covered work from you, a discriminatory patent license (a) in connection with copies of the covered work conveyed by you (or copies made from those copies), or (b) primarily for and in connection with specific products or compilations that contain the covered work, unless you entered into that arrangement, or that patent license was granted, prior to 28 March 2007. Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law. 12. No Surrender of Others' Freedom. If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program. 13. Use with the GNU Affero General Public License. Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such. 14. Revised Versions of this License. The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License "or any later version" applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the GNU General Public License, you may choose any version ever published by the Free Software Foundation. If the Program specifies that a proxy can decide which future versions of the GNU General Public License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Program. Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version. 15. Disclaimer of Warranty. THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 16. Limitation of Liability. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: Copyright (C) This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . gnss-share-0.7.2/Makefile000066400000000000000000000042131445534536600152510ustar00rootroot00000000000000# based off of the Makefile for aerc: # https://git.sr.ht/~rjarry/aerc/tree/master/item/Makefile .POSIX: .SUFFIXES: .SUFFIXES: .1 .1.scd .5 .5.scd VERSION?=`git describe --tags --dirty 2>/dev/null || echo 0.0.0` VPATH=doc PREFIX?=/usr/local BINDIR?=$(PREFIX)/bin SHAREDIR?=$(PREFIX)/share SYSCONFDIR?=/etc MANDIR?=$(PREFIX)/share/man GO?=go GOFLAGS?= LDFLAGS+=-X main.Version=$(VERSION) -s -w RM?=rm -f GOSRC!=find * -name '*.go' GOSRC+=go.mod go.sum DOCS := \ gnss-share.1 \ gnss-share.conf.5 all: gnss-share $(DOCS) gnss-share: $(GOSRC) $(GO) build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o gnss-share ./cmd/gnss-share .PHONY: fmt fmt: gofmt -w . # NOTE: most of the skipped staticcheck tests are from the default, SA1019 # skips the ioutil deprecation warning since some distros (Debian) are only on # Go 1.15, which was before some ioutil functionality was moved into other # modules (e.g. os.) # See: https://staticcheck.io/docs/configuration test: @if [ `gofmt -l . | wc -l` -ne 0 ]; then \ gofmt -d .; \ echo "ERROR: source files need reformatting with gofmt"; \ exit 1; \ fi @staticcheck -checks all,-ST1000,-ST1003,-ST1016,-ST1020,-ST1021,-ST1022,-ST1023,-SA1019 ./... @go test -race -count=1 ./... .1.scd.1: scdoc < $< > $@ .5.scd.5: scdoc < $< > $@ doc: $(DOCS) clean: $(RM) $(DOCS) gnss-share install: gnss-share $(DOCS) mkdir -m755 -p $(DESTDIR)$(BINDIR) install -m755 gnss-share $(DESTDIR)$(BINDIR)/ mkdir -m755 -p $(DESTDIR)$(SYSCONFDIR) install -m644 gnss-share.conf $(DESTDIR)$(BINDIR)/ install -Dm644 gnss-share.1 -t $(DESTDIR)$(MANDIR)/man1/ install -Dm644 gnss-share.conf.5 -t $(DESTDIR)$(MANDIR)/man5/ .PHONY: checkinstall checkinstall: test -e $(DESTDIR)$(BINDIR)/gnss-share test -e $(DESTDIR)$(BINDIR)/gnss-share.conf test -e $(DESTDIR)$(MANDIR)/man1/gnss-share.1 test -e $(DESTDIR)$(MANDIR)/man5/gnss-share.conf.5 RMDIR_IF_EMPTY:=sh -c '! [ -d $$0 ] || ls -1qA $$0 | grep -q . || rmdir $$0' uninstall: $(RM) $(DESTDIR)$(BINDIR)/gnss-share $(RM) $(DESTDIR)$(BINDIR)/gnss-share.conf $(RM) $(DESTDIR)$(MANDIR)/man1/gnss-share.1 $(RM) $(DESTDIR)$(MANDIR)/man5/gnss-share.conf.5 .PHONY: all doc clean install uninstall test gnss-share-0.7.2/README.md000066400000000000000000000017471445534536600151010ustar00rootroot00000000000000gnss-share is an app that facilitates sharing GNSS location data with multiple clients, while providing a way to perform device-specific setup beforehand. For some devices, it can also manage loading and storing A-GPS data. This is meant to replace things like `gpsd`, and `gps-share`, and work together with `geoclue`* or other clients that support fetching NMEA location data over sockets. # Configuration `gnss-share.conf` can be used to change the listening socket, group owner for socket, and other options. See `man gnss-share.conf` for details. The application looks for this file in either the current working directory, or in `/etc/gnss-share.conf`. # Usage See `man 1 gnss-share`. # Installation ### Dependencies: - Go Build the `gnss-share` application with: ``` $ go build ./cmd/gnss-share ``` # Development ### New GNSS device support Support for additional gnss devices can be added by implementing the `gnss_driver` interface, see `internal/gnss/gnss.go` for specifics. gnss-share-0.7.2/cmd/000077500000000000000000000000001445534536600143545ustar00rootroot00000000000000gnss-share-0.7.2/cmd/gnss-share/000077500000000000000000000000001445534536600164265ustar00rootroot00000000000000gnss-share-0.7.2/cmd/gnss-share/main.go000066400000000000000000000053661445534536600177130ustar00rootroot00000000000000// Copyright 2023 Clayton Craft // SPDX-License-Identifier: GPL-3.0-or-later package main import ( "flag" "fmt" "log" "os" "os/signal" "syscall" "gitlab.com/postmarketOS/gnss-share/internal/config" "gitlab.com/postmarketOS/gnss-share/internal/gnss" "gitlab.com/postmarketOS/gnss-share/internal/server" ) func usage() { flag.CommandLine.Usage() } func main() { var confFile string flag.StringVar(&confFile, "c", "/etc/gnss-share.conf", "Configuration file to use.") var help bool flag.BoolVar(&help, "h", false, "Print help and quit.") var debug bool flag.BoolVar(&debug, "d", false, "Enable printing debug output.") flag.Usage = func() { fmt.Println("usage: gnss-share COMMAND [OPTION...]") fmt.Println("Commands:") fmt.Printf(" %-12s\t%s\n", "[none]", "The default behavior if no command is specified is to run in \"server\" mode.") fmt.Printf(" %-12s\t%s\n", "store", "Store almanac and ephemeris data and quit.") fmt.Printf(" %-12s\t%s\n", "load", "Load almanac and ephemeris data and quit.") fmt.Println("Options:") flag.PrintDefaults() } flag.Parse() if help { usage() return } conf, err := config.Parse(confFile) if err != nil { log.Fatal(err) } var driver gnss.GnssDriver switch conf.Driver { case "stm": driver = gnss.NewStmGnss(conf.DevicePath, debug) case "stm_serial": driver = gnss.NewStmSerial(conf.DevicePath, conf.BaudRate, debug) } gnssDevice, err := gnss.New(driver) if err != nil { log.Fatal() } switch cmd := flag.Arg(0); cmd { case "store": err := driver.Save(conf.CachePath) if err != nil { log.Fatal(err) } return case "load": err := driver.Load(conf.CachePath) if err != nil { log.Fatal(err) } return default: if flag.Arg(0) != "" { fmt.Printf("Unknown command: %q\n", flag.Arg(0)) usage() return } // server mode } quitChan := make(chan struct{}) defer close(quitChan) // start signal handler sigChan := make(chan os.Signal, 1) signal.Notify(sigChan, syscall.SIGUSR1, syscall.SIGUSR2) go func() { for sig := range sigChan { switch sig { case syscall.SIGUSR1: fmt.Printf("received SIGUSR1, loading data from %q\n", conf.CachePath) if err := driver.Load(conf.CachePath); err != nil { // not fatal fmt.Printf("error loading data: %s\n", err) } case syscall.SIGUSR2: fmt.Printf("received SIGUSR2, storing data to %q\n", conf.CachePath) if err := driver.Save(conf.CachePath); err != nil { // not fatal fmt.Printf("error storing data: %s\n", err) } } } }() s := server.New(conf.Socket, conf.OwnerGroup) // Note: gnssDevice implements both interfaces. // TODO: one day this will be a ReadWriter if err := s.Start(gnssDevice, gnssDevice); err != nil { log.Fatal(err) } } gnss-share-0.7.2/doc/000077500000000000000000000000001445534536600143565ustar00rootroot00000000000000gnss-share-0.7.2/doc/gnss-share.1.scd000066400000000000000000000032571445534536600172710ustar00rootroot00000000000000gnss-share(1) "gnss-share" # NAME gnss-share # DESCRIPTION gnss-share is an app that facilitates sharing GNSS location data with multiple clients, while providing a way to perform device-specific setup beforehand. For some devices, it can also manage loading and storing A-GPS data. # CONCEPTS gnss-share was originally created to allow multiplexing GNSS data from a single device to multiple clients, and to facilitate loading/storing A-GPS data to and from the device. gnss-share effectively acts as a proxy between the GNSS device and the clients, which allows controlling when and what location data clients receive, as well as giving an opportunity to set time, rough location, etc on the device to improve lock speed. Some external signals can be used to control gnss-share, see *SIGNALS* for more information. # COMMANDS *[none]* The default behavior if no command is specified is to run in server mode. *store* Store almanac and ephemerides data and quit. *load* Load almanac and ephemerides data and quit. # OPTIONS *-c* Path to the configuration file to use. Default: /etc/gnss-share.conf *-d* Enable printing debug output. *-h* Print help and exit. # SIGNALS In addition to the command line options, this application will respond to the following signals when in "server" mode: *SIGUSR1* The application will load AGPS data from the directory *agps_directory* specified in the configuration file, and continue running afterward. *SIGUSR2* The application will store AGPS data to the directory *agps_directory* specified in the configuration file, and continue running afterward. # SEE ALSO *gnss-share.conf*(5) # AUTHORS *Clayton Craft* gnss-share-0.7.2/doc/gnss-share.conf.5.scd000066400000000000000000000013601445534536600202120ustar00rootroot00000000000000gnss-share.conf(5) "gnss-share.conf" # DESCRIPTION gnss-share.conf contains various options for configuring gnss-share. The file format is TOML. # OPTIONS *socket=""* Socket to sent NMEA location to, e.g. "/var/run/gnss-share.sock" *group=""* Group to set as owner for the socket. *device_driver=""* GPS device driver to use. Supported values: stm, stm_serial *device_path=""* Path to GPS device to use, e.g. "/dev/gnss0" *device_baud_rate=* Baud rate for GPS serial device, e.g. "9600". Only used if the device driver uses a serial interface. *agps_directory=""* Directory to load/store almanac and ephemeris data # SEE ALSO *gnss-share*(1) # AUTHORS *Clayton Craft* gnss-share-0.7.2/gnss-share.conf000066400000000000000000000006331445534536600165340ustar00rootroot00000000000000# Socket to sent NMEA location to socket="/var/run/gnss-share.sock" # Group to set as owner for the socket group="geoclue" # GPS device driver to use # Supported values: stm, stm_serial device_driver="stm" # Path to GPS device to use device_path="/dev/gnss0" # Baud rate for GPS serial device device_baud_rate=9600 # Directory to load/store almanac and ephemeris data agps_directory="/var/cache/gnss-share" gnss-share-0.7.2/go.mod000066400000000000000000000004101445534536600147120ustar00rootroot00000000000000module gitlab.com/postmarketOS/gnss-share go 1.15 require ( github.com/google/uuid v1.3.0 github.com/pelletier/go-toml v1.9.4 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07 ) require golang.org/x/sys v0.0.0-20211116061358-0a5406a5449c // indirect gnss-share-0.7.2/go.sum000066400000000000000000000013741445534536600147510ustar00rootroot00000000000000github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I= github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= github.com/pelletier/go-toml v1.9.4 h1:tjENF6MfZAg8e4ZmZTeWaWiT2vXtsoO6+iuOjFhECwM= github.com/pelletier/go-toml v1.9.4/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c= github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07 h1:UyzmZLoiDWMRywV4DUYb9Fbt8uiOSooupjTq10vpvnU= github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07/go.mod h1:kDXzergiv9cbyO7IOYJZWg1U88JhDg3PB6klq9Hg2pA= golang.org/x/sys v0.0.0-20211116061358-0a5406a5449c h1:DHcbWVXeY+0Y8HHKR+rbLwnoh2F4tNCY7rTiHJ30RmA= golang.org/x/sys v0.0.0-20211116061358-0a5406a5449c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= gnss-share-0.7.2/internal/000077500000000000000000000000001445534536600154255ustar00rootroot00000000000000gnss-share-0.7.2/internal/config/000077500000000000000000000000001445534536600166725ustar00rootroot00000000000000gnss-share-0.7.2/internal/config/config.go000066400000000000000000000014111445534536600204630ustar00rootroot00000000000000// Copyright 2021 Clayton Craft // SPDX-License-Identifier: GPL-3.0-or-later package config import ( "fmt" "io/ioutil" "path/filepath" toml "github.com/pelletier/go-toml" ) type Config struct { Socket string `toml:"socket"` OwnerGroup string `toml:"group"` Driver string `toml:"device_driver"` DevicePath string `toml:"device_path"` CachePath string `toml:"agps_directory"` BaudRate int `toml:"device_baud_rate"` } func Parse(file string) (c *Config, err error) { contents, err := ioutil.ReadFile(filepath.Clean(file)) if err != nil { err = fmt.Errorf("config.Parse(): %w", err) return } c = &Config{} if err = toml.Unmarshal(contents, c); err != nil { err = fmt.Errorf("config.Parse(): %w", err) } return } gnss-share-0.7.2/internal/gnss/000077500000000000000000000000001445534536600163775ustar00rootroot00000000000000gnss-share-0.7.2/internal/gnss/common/000077500000000000000000000000001445534536600176675ustar00rootroot00000000000000gnss-share-0.7.2/internal/gnss/common/common.go000066400000000000000000000007411445534536600215100ustar00rootroot00000000000000// Copyright 2023 Clayton Craft // SPDX-License-Identifier: GPL-3.0-or-later package common import ( "sync" ) // A simple ref counting type type Reference struct { sync.Mutex count int } func (r *Reference) Add() { r.Lock() defer r.Unlock() r.count += 1 } func (r *Reference) Remove() { r.Lock() defer r.Unlock() if r.count < 1 { return } r.count -= 1 } func (r *Reference) Count() int { r.Lock() defer r.Unlock() return r.count } gnss-share-0.7.2/internal/gnss/gnss.go000066400000000000000000000052061445534536600177030ustar00rootroot00000000000000// Copyright 2021 Clayton Craft // SPDX-License-Identifier: GPL-3.0-or-later package gnss import ( "fmt" "sync" "github.com/google/uuid" "gitlab.com/postmarketOS/gnss-share/internal/pubsub" ) type GnssDevice string const ( Stm GnssDevice = "stm" ) type GnssDriver interface { Load(dir string) error Save(dir string) error Start(send func(data []byte), write <-chan []byte, stop <-chan struct{}) error } type Gnss struct { driver GnssDriver driverStop chan struct{} bus *pubsub.PubSub dataTopic string writeTopic string mu sync.Mutex } func New(driver GnssDriver) (*Gnss, error) { return &Gnss{ dataTopic: uuid.NewString(), writeTopic: uuid.NewString(), driver: driver, bus: pubsub.New(pubsub.DefaultBufferSize), }, nil } func (g *Gnss) Load(dir string) error { return g.driver.Load(dir) } func (g *Gnss) Save(dir string) error { return g.driver.Save(dir) } // Implements io.Writer func (g *Gnss) Write(p []byte) (int, error) { if err := g.bus.Publish(g.writeTopic, p); err != nil { return 0, err } return len(p), nil } func (g *Gnss) Subscribe() (*pubsub.Subscription, error) { sub, err := g.bus.Subscribe(g.dataTopic) if err != nil { return nil, err } // Overload Unsubscribe() to also stop the driver if there are no longer // any active subscriptions defaultUnsub := sub.Unsubscribe sub.Unsubscribe = func() error { if err := defaultUnsub(); err != nil { return err } // Stop driver if there are no active subscriptions for our topic if g.bus.Subscribers(g.dataTopic) == 0 { fmt.Println("Stopping device") g.mu.Lock() defer g.mu.Unlock() if g.driverStop != nil { close(g.driverStop) } g.driverStop = nil } return nil } pub, err := g.bus.Subscribe(g.writeTopic) if err != nil { return nil, err } // Start the driver if this is the first subscription if g.bus.Subscribers(g.dataTopic) == 1 { g.mu.Lock() defer g.mu.Unlock() g.driverStop = make(chan struct{}) // This abstracts publishing to the pubsub topic so that drivers don't // have to deal with pubsub if they don't want to. // This also hooks up the pub messages to the driver. err := g.driver.Start(func(data []byte) { if err := g.bus.Publish(g.dataTopic, data); err != nil { fmt.Printf("error: unable to send data to %q: %s\n", g.dataTopic, data) } }, pub.Messages, g.driverStop) if err != nil { // Unsubscribe so this failed attempt is not counted as an active // subscription if err := defaultUnsub(); err != nil { fmt.Println("stm unable to unsubscribe from internal topic: ", err) } return nil, err } } return sub, nil } gnss-share-0.7.2/internal/gnss/stm.go000066400000000000000000000272211445534536600175350ustar00rootroot00000000000000// Copyright 2023 Clayton Craft // SPDX-License-Identifier: GPL-3.0-or-later package gnss import ( "bufio" "bytes" "fmt" "io" "os" "path/filepath" "strings" "sync" "syscall" "time" "github.com/tarm/serial" "gitlab.com/postmarketOS/gnss-share/internal/gnss/common" "gitlab.com/postmarketOS/gnss-share/internal/nmea" "gitlab.com/postmarketOS/gnss-share/internal/pubsub" ) // Internal pubsub topic, could be made dynamic later if necessary... const internalTopic = "stm_internal" type StmDevice struct { device io.ReadWriteCloser stopScan chan struct{} openDevice func() (io.ReadWriteCloser, error) ready func(time.Duration) error bus *pubsub.PubSub path string ref common.Reference mu sync.Mutex debug bool } func NewStmSerial(path string, baud int, debug bool) *StmDevice { s := StmDevice{ bus: pubsub.New(pubsub.DefaultBufferSize), debug: debug, path: path, stopScan: nil, } s.openDevice = func() (io.ReadWriteCloser, error) { return serial.OpenPort(&serial.Config{ Name: path, Baud: baud, }) } s.ready = func(_ time.Duration) error { // Send the command to resume just in case the module is in a suspended // state if s.debug { fmt.Println("stm sending resume") } if err := s.resume(); err != nil { return err } return nil } return &s } func (s *StmDevice) open() error { s.ref.Add() if s.ref.Count() > 1 { return nil } // Protected Section s.mu.Lock() var err error s.device, err = s.openDevice() if err != nil { s.mu.Unlock() // Don't hold a ref if the open failed (so that it can be retried later) s.ref.Remove() return err } if s.stopScan != nil { // shouldn't get here... but just in case... fmt.Println("stm received a request to start but it seems to already be started...") s.mu.Unlock() return nil } s.stopScan = make(chan struct{}) s.mu.Unlock() // End Protected Section go s.readlines(s.device, s.stopScan) // 3 seconds should be more than enough time for the module to boot. if err := s.ready(time.Duration(3 * time.Second)); err != nil { // Don't hold a ref if the open failed (so that it can be retried later) s.ref.Remove() return fmt.Errorf("stm device is not ready") } return nil } func (s *StmDevice) close() error { s.ref.Remove() if s.ref.Count() >= 1 { return nil } s.mu.Lock() defer s.mu.Unlock() if s.stopScan != nil { close(s.stopScan) s.stopScan = nil } // Safe shutdown, see: https://gitlab.com/postmarketOS/gnss-share/-/issues/15 if err := s.pause(); err != nil { fmt.Println("stm error when closing device: ", err) } if err := s.device.Close(); err != nil { return fmt.Errorf("stm failed to close device: %w", err) } s.device = nil return nil } func NewStmGnss(path string, debug bool) *StmDevice { s := StmDevice{ bus: pubsub.New(pubsub.DefaultBufferSize), debug: debug, path: path, stopScan: nil, } s.openDevice = func() (io.ReadWriteCloser, error) { // Using syscall.Open will open the file in non-pollable mode, which // results in a significant reduction in CPU usage on ARM64 systems, // and no noticeable impact on x86_64. We don't need to poll the file // since it's just a constant stream of new data from the kernel's GNSS // subsystem fd, err := syscall.Open(s.path, os.O_RDWR, 0666) if err != nil { return nil, fmt.Errorf("stm: failed opening %q: %w", path, err) } return os.NewFile(uintptr(fd), s.path), nil } s.ready = func(t time.Duration) error { // device sends this message when it has booted resp := nmea.New("GPTXT", []string{"DEFAULT LIV CONFIGURATION"}) sub, err := s.bus.Subscribe(internalTopic) if err != nil { return fmt.Errorf("stm unable to subscribe to internal topics: %w", err) } defer func() { if err := sub.Unsubscribe(); err != nil { fmt.Println("stm unable to unsubscribe to internal topics: ", err) } }() for { select { case line := <-sub.Messages: if bytes.Contains(line, resp) { return nil } case <-time.After(t): return fmt.Errorf("gnss/StmDevice.ready: timed out waiting for device") } } } return &s } func (s *StmDevice) readlines(device io.Reader, done <-chan struct{}) { // do the actual scan/read in a new goroutine, so that it's not // blocking for the parent goroutine lines := func() <-chan []byte { out := make(chan []byte) go func() { defer close(out) scanner := bufio.NewScanner(device) for scanner.Scan() { // Note: this forces a new allocation of the line, so it's not race-y data := append([]byte{}, scanner.Bytes()...) select { case out <- append(data, 0x0D, 0x0A): case <-done: return } } if err := scanner.Err(); err != nil { // meh return } }() return out }() for { select { case <-done: return case line, ok := <-lines: if !ok { // channel closed, no longer scanning return } if len(line) == 0 { continue } if err := s.bus.Publish(internalTopic, line); err != nil { fmt.Println("stm readlines unable to publish data: ", err) } } } } func (s *StmDevice) Start(send func(data []byte), write <-chan []byte, stop <-chan struct{}) error { if err := s.open(); err != nil { return fmt.Errorf("stm unable to open device: %w", err) } sub, err := s.bus.Subscribe(internalTopic) if err != nil { return fmt.Errorf("stm unable to start: %w", err) } go func() { defer func() { if err := s.close(); err != nil { fmt.Println("stm unable close device:", err) } if err := sub.Unsubscribe(); err != nil { fmt.Println("stm unable to unsubscribe to internal topics: ", err) } }() for { select { case <-stop: return case line := <-sub.Messages: send(line) case msg := <-write: if _, err := s.write(msg, []byte{}); err != nil { fmt.Println("stm message received for forwarding:", string(msg)) fmt.Println("stm unable to forward received message to device:", err) } } } }() return nil } func (s *StmDevice) Save(dir string) (err error) { if err := s.open(); err != nil { return fmt.Errorf("stm unable to open device: %w", err) } defer func() { cerr := s.close() if err == nil { err = cerr } }() err = os.MkdirAll(dir, 0750) if err != nil { return } err = s.saveEphemeris(filepath.Join(dir, "ephemeris.txt")) if err != nil { return } err = s.saveAlamanac(filepath.Join(dir, "almanac.txt")) if err != nil { return } return } func (s *StmDevice) Load(dir string) (err error) { if err := s.open(); err != nil { return fmt.Errorf("stm unable to open device: %w", err) } defer func() { cerr := s.close() if err == nil { err = cerr } }() err = s.loadEphemeris(filepath.Join(dir, "ephemeris.txt")) if err != nil { return } err = s.loadAlmanac(filepath.Join(dir, "almanac.txt")) if err != nil { return } return } func (s *StmDevice) saveEphemeris(path string) (err error) { fmt.Printf("Storing ephemerides to: %q\n", path) if err = s.pause(); err != nil { return } defer func() { cerr := s.resume() if err == nil { err = cerr } }() out, err := s.write(nmea.New("PSTMDUMPEPHEMS", []string{}), []byte("DUMPEPHEMS")) if err != nil { return fmt.Errorf("gnss/Stm.saveEphemeris: %w", err) } fd, err := os.Create(filepath.Clean(path)) if err != nil { err = fmt.Errorf("gnss/Stm.Save: error saving to file %q: %w", path, err) return } defer func() { cerr := fd.Close() if err == nil { err = cerr } }() for _, l := range out { if strings.HasPrefix(l, "$PSTMEPHEM,") { fmt.Fprintf(fd, "%s", l) } } return } func (s *StmDevice) saveAlamanac(path string) (err error) { fmt.Printf("Storing almanac to: %q\n", path) if err = s.pause(); err != nil { return } defer func() { cerr := s.resume() if err == nil { err = cerr } }() out, err := s.write(nmea.New("PSTMDUMPALMANAC", []string{}), []byte("DUMPALMANAC")) if err != nil { return fmt.Errorf("gnss/Stm.saveAlmanac: %w", err) } fd, err := os.Create(filepath.Clean(path)) if err != nil { return fmt.Errorf("gnss/Stm.saveAlamanac: error saving to file %q: %w", path, err) } defer func() { cerr := fd.Close() if err == nil { err = cerr } }() for _, l := range out { if strings.HasPrefix(l, "$PSTMALMANAC,") { fmt.Fprintf(fd, "%s", l) } } return } // Send the given command to the module. It attempts to get confirmation by // comparing ackResponse to the data it receives from the module (if // ackResponse is not empty). An error is returned if ackResponse is not empty // and it fails to find a match before it times out. func (s *StmDevice) write(cmd []byte, ackResponse []byte) (out []string, err error) { sub, err := s.bus.Subscribe(internalTopic) if err != nil { return out, fmt.Errorf("stm unable to subscribe to internal topic: %w", err) } defer func() { if err := sub.Unsubscribe(); err != nil { fmt.Println("stm unable to unsubscribe to internal topics: ", err) } }() cmd = bytes.TrimSpace(cmd) if s.debug { fmt.Println("write: ", string(cmd)) } // add crlf _, err = s.device.Write(append(cmd, 0x0D, 0x0A)) if err != nil { err = fmt.Errorf("write: %w", err) return } if err != nil { err = fmt.Errorf("write: %w", err) return } if len(ackResponse) == 0 { return } // Note: timeout has to be high enough that some commands (e.g. reading // ephemeris and almanac) don't time out... Hard-coding this is somewhat // hacky... but it's unlikely(?) that a real comand would take more than 30 // seconds to finish timeout := time.After(30 * time.Second) timeout_loop: for { select { case line := <-sub.Messages: if s.debug { fmt.Printf("read: %s", line) } // Command it echo'd back when it is complete. if bytes.Contains(line, ackResponse) { break timeout_loop } out = append(out, string(line)) case <-timeout: return out, fmt.Errorf("write: timed out waiting for device") } } return } func (s *StmDevice) pause() (err error) { _, err = s.write(nmea.New("PSTMGPSSUSPEND", []string{}), nil) if err != nil { return fmt.Errorf("gnss/Stm.pause: %w", err) } return } func (s *StmDevice) resume() (err error) { _, err = s.write(nmea.New("PSTMGPSRESTART", []string{}), nil) if err != nil { return fmt.Errorf("gnss/Stm.pause: %w", err) } return } func (s *StmDevice) loadEphemeris(path string) (err error) { fd, err := os.Open(filepath.Clean(path)) if err != nil { err = fmt.Errorf("gnss/Stm.loadEphemeris: %w", err) return } defer func() { cerr := fd.Close() if err == nil { err = cerr } }() if err = s.pause(); err != nil { return } defer func() { cerr := s.resume() if err == nil { err = cerr } }() var lines [][]byte scanner := bufio.NewScanner(fd) for scanner.Scan() { line := bytes.TrimSpace(scanner.Bytes()) lines = append(lines, append([]byte(nil), line...)) } for _, line := range lines { _, err = s.write(line, []byte("EPHEMOK")) if err != nil { return fmt.Errorf("gnss/Stm.loadEphemeris: %w", err) } } return } func (s *StmDevice) loadAlmanac(path string) (err error) { fd, err := os.Open(filepath.Clean(path)) if err != nil { err = fmt.Errorf("gnss/Stm.loadAlmanac: %w", err) return } defer func() { cerr := fd.Close() if err == nil { err = cerr } }() if err = s.pause(); err != nil { return } defer func() { cerr := s.resume() if err == nil { err = cerr } }() var lines [][]byte scanner := bufio.NewScanner(fd) for scanner.Scan() { line := bytes.TrimSpace(scanner.Bytes()) lines = append(lines, append([]byte(nil), line...)) } for _, line := range lines { _, err = s.write(line, []byte("ALMANACOK")) if err != nil { return fmt.Errorf("gnss/Stm.loadAlmanac: %w", err) } } return } gnss-share-0.7.2/internal/nmea/000077500000000000000000000000001445534536600163455ustar00rootroot00000000000000gnss-share-0.7.2/internal/nmea/nmea.go000066400000000000000000000015161445534536600176170ustar00rootroot00000000000000// Copyright 2021 Clayton Craft // SPDX-License-Identifier: GPL-3.0-or-later package nmea import ( "strconv" "strings" ) func New(sentence string, data []string) []byte { // max length of NMEA sentence is 82 (according to wikipedia...) buf := make([]byte, 0, 82) buf = append(buf, '$') buf = append(buf, []byte(sentence)...) for _, d := range data { buf = append(buf, ',') buf = append(buf, []byte(d)...) } if len(data) == 0 { // always make sure the type is followed by a comma if there is no data buf = append(buf, ',') } // add checksum sum := checksum(buf[1:]) buf = append(buf, '*') buf = append(buf, sum...) return buf } func checksum(b []byte) []byte { var sum uint8 for i := 0; i < len(b); i++ { sum ^= b[i] } return []byte(strings.ToUpper(strconv.FormatInt(int64(sum), 16))) } gnss-share-0.7.2/internal/nmea/nmea_test.go000066400000000000000000000023441445534536600206560ustar00rootroot00000000000000// Copyright 2021 Clayton Craft // SPDX-License-Identifier: GPL-3.0-or-later package nmea import ( "bytes" "testing" ) // Test sentence checksumming func TestChecksum(t *testing.T) { tables := []struct { in string expected string }{ {"GPGLL,0000.00000,N,00000.00000,E,070254.000,V,N", "45"}, {"GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0", "1E"}, {"PSTMDUMPEPHEMS,", "3C"}, } for _, table := range tables { out := checksum([]byte(table.in)) if !bytes.Equal(out, []byte(table.expected)) { t.Errorf("%q expected: %q, got: %q", table.in, table.expected, out) } } } // Test sentence stringer func TestStringer(t *testing.T) { tables := []struct { inType string inData []string expected string }{ {"PSTMGPSSUSPEND", []string{}, "$PSTMGPSSUSPEND,*38"}, {"GPGGA", []string{"070319.000", "0000.00000", "N", "00000.00000", "E", "0", "00", "99.0", "100.00", "M", "0.0", "M", "", ""}, "$GPGGA,070319.000,0000.00000,N,00000.00000,E,0,00,99.0,100.00,M,0.0,M,,*60"}, } for _, table := range tables { out := New(table.inType, table.inData) if !bytes.Equal(out, []byte(table.expected)) { t.Errorf("%q, %q expected: %q, got: %q", table.inType, table.inData, table.expected, out) } } } gnss-share-0.7.2/internal/pubsub/000077500000000000000000000000001445534536600167255ustar00rootroot00000000000000gnss-share-0.7.2/internal/pubsub/pubsub.go000066400000000000000000000064041445534536600205600ustar00rootroot00000000000000package pubsub import ( "fmt" "strings" "sync" ) type Subscriber interface { // Subscribe returns a new subscription Subscribe() (*Subscription, error) } // ErrNoSubscribers is returned when attempting to publish on a topic that has // no subscribers type ErrNoSubscribers struct{} func (e *ErrNoSubscribers) Error() string { return "topic has no subscribers" } // ErrNotSubscribed is returned when attempting to unsubscribe from a topic // when not initially subscribed to it. type ErrNotSubscribed struct{} func (e *ErrNotSubscribed) Error() string { return "not subscribed to topic" } type PubSub struct { topics map[string]([]chan []byte) bufferSize int mu sync.RWMutex } type Subscription struct { Unsubscribe func() error Messages <-chan []byte Topic string } const DefaultBufferSize int = 4096 func New(bufferSize int) *PubSub { return &PubSub{ topics: make(map[string][]chan []byte), bufferSize: bufferSize, } } // Subscribe to the given topic. Topics are not case senstitive. func (p *PubSub) Subscribe(topic string) (*Subscription, error) { topic = strings.ToLower(topic) p.mu.Lock() defer p.mu.Unlock() // buffered msgs := make(chan []byte, p.bufferSize) p.topics[topic] = append(p.topics[topic], msgs) return &Subscription{ Unsubscribe: func() error { return p.unsubscribe(topic, msgs) }, Messages: msgs, Topic: topic, }, nil } // Subscribers returns the number of subscriptions for the given topic. func (p *PubSub) Subscribers(topic string) int { topic = strings.ToLower(topic) p.mu.RLock() defer p.mu.RUnlock() return len(p.topics[topic]) } // Publish the given data to all subscriptions for the given topic.The // subscription channels are buffered, however this will drop messages to // subscribers that aren't ready to receive on their subscription channel when // the channel buffer is full. Topics are not case sensitive. func (p *PubSub) Publish(topic string, data []byte) error { topic = strings.ToLower(topic) p.mu.RLock() defer p.mu.RUnlock() if subs, ok := p.topics[topic]; !ok || len(p.topics[topic]) == 0 { return &ErrNoSubscribers{} } else { for _, sub := range subs { d := append([]byte{}, data...) select { case sub <- d: default: // don't block } } } return nil } // Unsubscribe the given subscription channel from the given topic. Returns // ErrNotSubscribed if attempting to unsubscribe from a topic when not // subscribed to it. func (p *PubSub) unsubscribe(topic string, sub <-chan []byte) error { p.mu.Lock() defer p.mu.Unlock() found := false for i, s := range p.topics[topic] { subs := p.topics[topic] if sub == s { // note: this doesn't preserve order, but I don't think it matters // in this case subs[i] = subs[len(subs)-1] p.topics[topic] = subs[:len(subs)-1] found = true close(s) s = nil // Keep going, just in case the sub channel is in the list more // than once for some reason... } } if !found { return &ErrNotSubscribed{} } return nil } // Close will close all subscription channels for all topics func (p *PubSub) Close() { for topic, subs := range p.topics { for _, sub := range subs { if err := p.unsubscribe(topic, sub); err != nil { fmt.Println("unable to unsubscribe from topic: ", err) } } } } gnss-share-0.7.2/internal/pubsub/pubsub_test.go000066400000000000000000000036611445534536600216210ustar00rootroot00000000000000package pubsub import ( "bytes" "testing" "time" ) func TestSubscribers(t *testing.T) { tests := []struct { name string // number of subscriptions to create total int }{ { name: "4 subscriptions", total: 4, }, } p := New(DefaultBufferSize) var list []*Subscription for _, test := range tests { t.Run(test.name, func(t *testing.T) { for i := 0; i < test.total; i++ { sub, err := p.Subscribe(test.name) if err != nil { t.Errorf("unable to subscribe: %s", err) } list = append(list, sub) } cnt := p.Subscribers(test.name) if cnt != test.total { t.Errorf("expected: %d, got %d\n", test.total, cnt) } for _, sub := range list { if err := sub.Unsubscribe(); err != nil { t.Errorf("unable to unsubscribe: %s", err) } } cnt = p.Subscribers(test.name) if cnt != 0 { t.Errorf("expected: 0, got %d\n", cnt) } }) } } func TestClose(t *testing.T) { p := New(DefaultBufferSize) t.Run("test close", func(t *testing.T) { for i := 0; i < 16; i++ { _, err := p.Subscribe("test close") if err != nil { t.Errorf("unable to subscribe: %s", err) } } p.Close() cnt := p.Subscribers("test close") if cnt != 0 { t.Errorf("expected: 0, got %d\n", cnt) } }) } func TestPublish(t *testing.T) { tests := []struct { name string in []byte }{ { name: "simple ping", in: []byte("guava is great"), }, } p := New(DefaultBufferSize) for _, test := range tests { t.Run(test.name, func(t *testing.T) { sub, err := p.Subscribe(test.name) if err != nil { if err != nil { t.Errorf("unable to subscribe: %s", err) } } go p.Publish(test.name, test.in) select { case result := <-sub.Messages: if !bytes.Equal(result, test.in) { t.Errorf("expected: %s, got: %s", string(test.in), string(result)) } case <-time.After(1 * time.Second): t.Error("timed out waiting for message") } }) } } gnss-share-0.7.2/internal/server/000077500000000000000000000000001445534536600167335ustar00rootroot00000000000000gnss-share-0.7.2/internal/server/server.go000066400000000000000000000115571445534536600206010ustar00rootroot00000000000000// Copyright 2021 Clayton Craft // SPDX-License-Identifier: GPL-3.0-or-later package server import ( "bytes" "errors" "fmt" "io" "net" "os" "os/user" "strconv" "time" "gitlab.com/postmarketOS/gnss-share/internal/pubsub" ) type Server struct { sock net.Listener socket string sockGroup string } // New initializes a new Server. socket is the path to the unix socket that the // server will create and listen on, and sockGroup is the group owner for the // socket. func New(socket string, sockGroup string) (s *Server) { s = &Server{ socket: socket, sockGroup: sockGroup, } return } func (s *Server) Stop() { // #nosec G104 - ignore socket close failures on purpose s.sock.Close() } func (s *Server) Start(subscriber pubsub.Subscriber, publisher io.Writer) (err error) { if err := os.RemoveAll(s.socket); err != nil { return fmt.Errorf("startServer(): %w", err) } s.sock, err = net.Listen("unix", s.socket) if err != nil { return fmt.Errorf("startServer(): %w", err) } defer func() { cerr := s.sock.Close() if err == nil { err = cerr } }() // #nosec G302 - group needs R/W access if err := os.Chmod(s.socket, 0660); err != nil { return fmt.Errorf("startServer(): %w", err) } group, err := user.LookupGroup(s.sockGroup) if err != nil { return fmt.Errorf("startServer(): %w", err) } gid, err := strconv.ParseInt(group.Gid, 10, 16) if err != nil { return fmt.Errorf("startServer(): %w", err) } if err := os.Chown(s.socket, -1, int(gid)); err != nil { return fmt.Errorf("startServer(): %w", err) } fmt.Println("Starting GNSS server, accepting connections at: ", s.socket) for { if conn, err := (s.sock).Accept(); err != nil { fmt.Println("server: connection accept failed: ", err) continue } else { go func() { if sub, err := subscriber.Subscribe(); err != nil { fmt.Println("server: unable to subscribe to topic: ", err) // #nosec G104 - ignore conn close failures on purpose conn.Close() } else { s.clientConnection(conn, sub, publisher) } }() } } } // Routine run for each client connection func (s *Server) clientConnection(conn net.Conn, sub *pubsub.Subscription, pub io.Writer) { defer func() { // Note: close() could potentially be called twice, e.g. once on socket // read failure and again here, however upon inspection of the Go // implementation for net.Conn.UnixConn this doesn't seem to matter... // #nosec G104 - ignore conn close failures on purpose conn.Close() fmt.Println("Client disconnected") if err := sub.Unsubscribe(); err != nil { fmt.Println("server: connection unsubscribe failed: ", err) } }() fmt.Println("Client connected") // This "read" goroutine conveniently serves as a trigger for when the client // closes the connection. Without it, the "write" for loop later will hang // indefinitely if no data is sent to the subscription channel. The "done" // chan is closed when this "read" goroutine returns, which will happen if // the client disconnects. done := make(chan struct{}) go func() { // #nosec G307 - ignore conn close failures on purpose defer conn.Close() defer close(done) for { buf := make([]byte, 1024) size, err := conn.Read(buf) if err != nil { if !errors.Is(err, io.EOF) { fmt.Println("server: unable to read from socket: ", err) } return } if size == 0 { continue } if _, err := pub.Write(buf); err != nil { fmt.Println("server: unable to send received data to sub: ", err) } } }() for { // read all data (inluding buffered) from the channel // if there's anything to send, send it // don't spin in a loop, and don't use time.Sleep, it should block on channel read var msg []byte select { case <-done: return case data, ok := <-sub.Messages: if !ok { fmt.Println("server: unable to read from client subscription channel") return } msg = data } // This receive loop will slurp up any data that is in the channel // buffers receive_loop: for { select { case data := <-sub.Messages: msg = append(msg, data...) case <-done: return default: break receive_loop } } if bytes.Equal(msg, []byte{}) { continue } if err := conn.SetWriteDeadline(time.Now().Add(5 * time.Second)); err != nil { // Note: this is only supported in Go 1.16... uncomment when the // min version is increased to at least that version:: // if !errors.Is(err, net.ErrClosed) { // fmt.Println("server: client unable to set socket write deadline: ", err) // } return } if _, err := conn.Write(msg); err != nil { if errors.Is(err, os.ErrDeadlineExceeded) { // Client hasn't read in a long time, so just bail for now. Maybe // later this could retry a few times or wait longer? fmt.Println("server: client hasn't read from socket in 5s, disconnecting it") return } return } } } gnss-share-0.7.2/openrc/000077500000000000000000000000001445534536600150775ustar00rootroot00000000000000gnss-share-0.7.2/openrc/gnss-share.confd000077500000000000000000000001521445534536600201650ustar00rootroot00000000000000#error_logger="logger -t gnss-share -p daemon.error" #output_logger="logger -t gnss-share -p daemon.info" gnss-share-0.7.2/openrc/gnss-share.initd000066400000000000000000000005461445534536600202070ustar00rootroot00000000000000#!/sbin/openrc-run # Copyright 2021 Clayton Craft # SPDX-License-Identifier: GPL-3.0-or-later description="GNSS location manager" : ${error_logger="logger -t gnss-share -p daemon.error"} : ${output_logger="logger -t gnss-share -p daemon.info"} command=/usr/bin/gnss-share command_background=true pidfile="/run/${RC_SVCNAME}.pid" depend () { use logger } gnss-share-0.7.2/systemd/000077500000000000000000000000001445534536600153015ustar00rootroot00000000000000gnss-share-0.7.2/systemd/gnss-share.service000066400000000000000000000004021445534536600207310ustar00rootroot00000000000000[Unit] Description=Manage access to and AGPS on GNSS devices Documentation=https://gitlab.com/postmarketOS/gnss-share Before=gpsd.service gpsd.socket geoclue.service [Service] Type=simple ExecStart=/usr/bin/gnss-share [Install] WantedBy=multi-user.target