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Add restart on network address change
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Simul Piscator
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Nov 8, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* | ||
| AirSane Imaging Daemon | ||
| Copyright (C) 2018-2023 Simul Piscator | ||
| 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 <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| #include "networkhotplugnotifier.h" | ||
|
|
||
| #include <iostream> | ||
| #include <vector> | ||
| #include <thread> | ||
|
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||
| #include <poll.h> | ||
| #include <unistd.h> | ||
| #include <netinet/in.h> | ||
| #include <linux/netlink.h> | ||
| #include <linux/rtnetlink.h> | ||
| #include <net/if.h> | ||
|
|
||
| struct NetworkHotplugNotifier::Private | ||
| { | ||
| std::thread mThread; | ||
| NetworkHotplugNotifier* mpNotifier; | ||
| int mPipeWriteFd, mPipeReadFd; | ||
|
|
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| Private(NetworkHotplugNotifier* pNotifier) | ||
| : mpNotifier(pNotifier), mPipeWriteFd(-1), mPipeReadFd(-1) | ||
| { | ||
| int fds[2]; | ||
| if (::pipe(fds) < 0) { | ||
| std::cerr << "Could not create socket pair " << errno << std::endl; | ||
| return; | ||
| } | ||
| mPipeReadFd = fds[0]; | ||
| mPipeWriteFd = fds[1]; | ||
| mThread = std::thread([this]() { hotplugThread(); }); | ||
| } | ||
|
|
||
| ~Private() | ||
| { | ||
| char c = '0'; | ||
| ::write(mPipeWriteFd, &c, 1); | ||
| mThread.join(); | ||
| ::close(mPipeWriteFd); | ||
| ::close(mPipeReadFd); | ||
| } | ||
|
|
||
| void hotplugThread() | ||
| { | ||
| int sock = ::socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | ||
| if (sock < 0) { | ||
| std::cerr << "Could not create netlink socket: " << errno << std::endl; | ||
| return; | ||
| } | ||
|
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| sockaddr_nl addr = {0}; | ||
| addr.nl_family = AF_NETLINK; | ||
| addr.nl_groups = RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR; | ||
| if (::bind(sock, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0) { | ||
| std::cerr << "Could not bind netlink socket: " << errno << std::endl; | ||
| ::close(sock); | ||
| return; | ||
| } | ||
|
|
||
| struct pollfd pfds[2] = {0}; | ||
| pfds[0].fd = mPipeReadFd; | ||
| pfds[0].events = POLLIN; | ||
| pfds[1].fd = sock; | ||
| pfds[1].events = POLLIN; | ||
|
|
||
| char buffer[4096]; | ||
| bool done = false; | ||
| while (!done) { | ||
| int r = ::poll(pfds, sizeof(pfds)/sizeof(*pfds), -1); | ||
| if (r > 0 && pfds[0].revents) { | ||
| done = true; | ||
| } | ||
| else if (r > 0 && pfds[1].revents) { | ||
| int len = ::read(sock, buffer, sizeof(buffer)); | ||
| if (len > 0) { | ||
| union { const char* c; struct nlmsghdr* n; } data = { buffer }; | ||
| if (data.n->nlmsg_flags & MSG_TRUNC) | ||
| continue; | ||
| while (NLMSG_OK(data.n, len) && (data.n->nlmsg_type != NLMSG_DONE)) { | ||
| if (data.n->nlmsg_type == RTM_NEWADDR) | ||
| mpNotifier->onHotplugEvent(addressArrived); | ||
| else if(data.n->nlmsg_type == RTM_DELADDR) | ||
| mpNotifier->onHotplugEvent(addressLeft); | ||
| NLMSG_NEXT(data.n, len); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| }; | ||
|
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| NetworkHotplugNotifier::NetworkHotplugNotifier() | ||
| : p(new Private(this)) | ||
| {} | ||
|
|
||
| NetworkHotplugNotifier::~NetworkHotplugNotifier() | ||
| { | ||
| delete p; | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /* | ||
| AirSane Imaging Daemon | ||
| Copyright (C) 2018-2023 Simul Piscator | ||
| 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 <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| #ifndef NETWORK_HOTPLUGNOTIFIER_H | ||
| #define NETWORK_HOTPLUGNOTIFIER_H | ||
|
|
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| class NetworkHotplugNotifier | ||
| { | ||
| NetworkHotplugNotifier(const NetworkHotplugNotifier&) = delete; | ||
| NetworkHotplugNotifier& operator=(const NetworkHotplugNotifier&) = delete; | ||
|
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| public: | ||
| NetworkHotplugNotifier(); | ||
| virtual ~NetworkHotplugNotifier(); | ||
|
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| protected: | ||
| enum Event | ||
| { | ||
| other, | ||
| addressArrived, | ||
| addressLeft, | ||
| }; | ||
| virtual void onHotplugEvent(Event) {} | ||
|
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| private: | ||
| struct Private; | ||
| Private* p; | ||
| }; | ||
|
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| #endif // NETWORK_HOTPLUGNOTIFIER_H |