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PS5_RetroArch/daemon/webui_daemon.cpp
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Mihawk b294a48d09 WebUI daemon: answer the title while the WebUI starts; the title asks again 
On the console the daemon stopped minutes after every start, the page then refused to
connect, and the status said RetroArch was closed while the picker ran. Its log
(webui-daemon.txt): "serving the WebUI" 6 s (9 s the time before) after its start,
then "linked: picker", "unlinked: title", "unlinked: picker", and 20 s later "no program
of the title linked: the title is closed". The WebUI's start (reading the library, once
for each of 16 saved scraping jobs) ran on the link loop: the picker's hello waited past
its 5 s, the picker gave up for good, and the daemon, linked to nothing, stopped.

- The daemon starts the WebUI on a thread of its own (4 MiB stack, joined before a
  stop): hellos are answered meanwhile.
- The saved jobs are read against one scan of the library, not one each.
- src/webui_link.cpp: a hello not answered is asked again every second, never given up
  while the daemon is there.

Evidence: tests/test_webui_daemon.py test_hellos_are_answered_while_the_webui_starts (a
start made 7 s slow: both hellos answered in under 1.5 s, the WebUI up later with the
right frontend). tools/verify.sh: PASS (format unit build integration evidence).
2026-10-07 16:22:17 -04:00

471 lines
17 KiB
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/* PS5 RetroArch - the WebUI daemon, /app0/webui/ps5-retroarch-webui.elf.
*
* Copyright (C) 2026 Mihawk
* SPDX-License-Identifier: GPL-3.0-or-later
*
* A payload, started through the console's ELF loader by the first program of the
* title that finds none running (src/webui_link.cpp): it serves the WebUI
* (src/webui_ps5.cpp) on 6769 from the title's folder for as long as the title is
* open, whichever frontend it shows, so a frontend change (a LoadExec, which ends the
* program it leaves) never cuts an upload or a page. The protocol is in
* src/webui_link.h.
*
* It stops when no program of the title has been linked for kIdleSeconds and no
* request is being answered: the title closed. An update the WebUI is asked to
* install makes every linked program close the title; once none is left, this
* installs it (ps5_update::install), the way eboot.bin did after RetroArch quit.
*
* Its own record is <title>/webui-daemon.txt (the last run's is webui-daemon.1.txt).
* tests/test_webui_daemon.py builds it for the host, with its folder, ports and idle
* time its own.
*/
#include "../src/webui_ps5.h"
#include "../src/webui_update.h"
#include <arpa/inet.h>
#include <cerrno>
#include <csignal>
#include <cstdarg>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <fcntl.h>
#include <netinet/in.h>
#include <poll.h>
#include <pthread.h>
#include <atomic>
#include <string>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
#include <vector>
#include "../src/webui_link.h"
#ifndef PS5_WEBUI_HOMEBREW
#define PS5_WEBUI_HOMEBREW "/data/homebrew"
#endif
#ifndef PS5_WEBUI_HTTP_PORT
#define PS5_WEBUI_HTTP_PORT 6769
#endif
#ifndef PS5_WEBUI_IDLE_SECONDS
#define PS5_WEBUI_IDLE_SECONDS 20.0
#endif
#ifdef __PROSPERO__
/* What the daemon creates in the title's folder is given 0777, as eboot.bin gives
* everything under /app0 (src/permissions_ps5.cpp), so FTP can change it: open,
* mkdir and fopen are wrapped at link time (tools/build-webui-daemon.sh). */
extern "C"
{
int __real_mkdir(const char *, mode_t);
int __real_open(const char *, int, ...);
std::FILE *__real_fopen(const char *, const char *);
int __wrap_mkdir(const char *path, mode_t mode)
{
const int result = __real_mkdir(path, mode | 0777);
if (result == 0)
chmod(path, 0777);
return result;
}
int __wrap_open(const char *path, int flags, ...)
{
if ((flags & O_CREAT) == 0)
return __real_open(path, flags);
va_list arguments;
va_start(arguments, flags);
const int mode = va_arg(arguments, int);
va_end(arguments);
const int fd = __real_open(path, flags, mode | 0777);
if (fd >= 0)
fchmod(fd, 0777);
return fd;
}
std::FILE *__wrap_fopen(const char *path, const char *mode)
{
std::FILE *const file = __real_fopen(path, mode);
if (file && mode && std::strpbrk(mode, "wa+"))
fchmod(fileno(file), 0777);
return file;
}
}
#endif
namespace
{
constexpr double kIdleSeconds = PS5_WEBUI_IDLE_SECONDS; /* no program linked: closed */
constexpr double kInstallSeconds = 5.0; /* no program linked, an install asked */
constexpr double kNoHelloSeconds = 30.0; /* started, and no program ever linked */
struct Link
{
int fd;
std::string pending, frontend;
bool hello = false;
};
std::string root, title, version, log_path;
std::vector<std::string> early_lines;
double now_s()
{
timespec now{};
clock_gettime(CLOCK_MONOTONIC, &now);
return double(now.tv_sec) + double(now.tv_nsec) / 1e9;
}
void say(const char *format, ...)
{
char line[512];
va_list arguments;
va_start(arguments, format);
std::vsnprintf(line, sizeof line, format, arguments);
va_end(arguments);
std::fprintf(stderr, "[webui-daemon] %s\n", line);
if (log_path.empty())
{
early_lines.emplace_back(line);
return;
}
if (std::FILE *file = std::fopen(log_path.c_str(), "a"))
{
std::time_t t = std::time(nullptr);
char stamp[32];
std::strftime(stamp, sizeof stamp, "%Y-%m-%d %H:%M:%S", std::gmtime(&t));
/* The process: a stale daemon still finishing writes to the same file. */
std::fprintf(file, "%s [%d] %s\n", stamp, int(getpid()), line);
std::fclose(file);
}
}
std::string read_small(const std::string &path)
{
std::string out;
if (std::FILE *file = std::fopen(path.c_str(), "rb"))
{
char buffer[4096];
size_t got;
while ((got = std::fread(buffer, 1, sizeof buffer, file)) > 0 && out.size() < 65536)
out.append(buffer, got);
std::fclose(file);
}
return out;
}
bool is_file(const std::string &path)
{
struct stat st{};
return stat(path.c_str(), &st) == 0 && S_ISREG(st.st_mode);
}
bool valid_id(const std::string &id)
{
if (id.size() != 9)
return false;
for (char c : id)
if (!((c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9')))
return false;
return true;
}
/* The title's folder: what is mounted as its application folder
* (/data/homebrew/PPSA99169 -> /system_ex/app/PPSA99169, docs/FINDINGS.md), else
* the usual place; either only when it holds this title's eboot.bin and WebUI. */
std::string title_folder(const std::string &id)
{
std::vector<std::string> candidates;
#ifdef __PROSPERO__
struct statfs *mounts = nullptr;
const int count = getmntinfo(&mounts, MNT_NOWAIT);
const std::string app = "/system_ex/app/" + id;
for (int i = 0; i < count; ++i)
if (app == mounts[i].f_mntonname && mounts[i].f_mntfromname[0] == '/')
candidates.emplace_back(mounts[i].f_mntfromname);
#endif
candidates.push_back(PS5_WEBUI_HOMEBREW "/" + id);
for (const auto &folder : candidates)
if (is_file(folder + "/eboot.bin") && is_file(folder + "/webui/index.html") &&
read_small(folder + "/sce_sys/param.json").find(id) != std::string::npos)
return folder;
return "";
}
bool send_line(int fd, const char *line)
{
const size_t size = std::strlen(line);
return send(fd, line, size, 0) == ssize_t(size);
}
int listen_local(unsigned short port)
{
const int fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0)
return -1;
int yes = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes);
sockaddr_in address{};
address.sin_family = AF_INET;
address.sin_port = htons(port);
address.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if (bind(fd, reinterpret_cast<sockaddr *>(&address), sizeof address) != 0 || listen(fd, 8) != 0)
{
close(fd);
return -1;
}
return fd;
}
void show_frontend(const std::vector<Link> &links)
{
const char *shown = "";
for (const auto &link : links)
if (link.hello)
shown = link.frontend.c_str();
ps5_webui_set_frontend(shown);
}
} // namespace
int main()
{
std::signal(SIGPIPE, SIG_IGN);
int listener = listen_local(PS5_WEBUI_LINK_PORT);
if (listener < 0)
{
std::fprintf(stderr, "[webui-daemon] another daemon has %d; this one stops\n",
PS5_WEBUI_LINK_PORT);
return 0;
}
ps5_webui_set_frontend("");
std::vector<Link> links;
bool serving = false, stale = false, install_sent = false, installed = false;
const double started = now_s();
double idle_since = started, installed_at = 0, last_serve_try = 0;
unsigned serve_failures = 0;
/* The WebUI starts on a thread of its own (reading the library and the saved scraping
* jobs takes seconds): the title's hello is answered meanwhile. 0 idle, 1 starting,
* 2 serving, 3 failed. */
static std::atomic<int> start_state{0};
static std::string start_folder;
pthread_t starter{};
bool starter_running = false;
say("started; listening for the title on 127.0.0.1:%d", PS5_WEBUI_LINK_PORT);
for (;;)
{
std::vector<pollfd> waits;
if (listener >= 0)
waits.push_back({listener, POLLIN, 0});
for (const auto &link : links)
waits.push_back({link.fd, POLLIN, 0});
poll(waits.data(), waits.size(), 250);
if (listener >= 0 && (waits[0].revents & POLLIN))
{
const int fd = accept(listener, nullptr, nullptr);
if (fd >= 0 && links.size() < 16)
links.push_back({fd, "", "", false});
else if (fd >= 0)
close(fd);
}
for (auto &link : links)
{
pollfd wait{link.fd, POLLIN, 0};
if (poll(&wait, 1, 0) <= 0)
continue;
char buffer[512];
const ssize_t got = recv(link.fd, buffer, sizeof buffer, 0);
if (got <= 0 || link.pending.size() > 4096)
{
close(link.fd);
link.fd = -1;
continue;
}
link.pending.append(buffer, size_t(got));
size_t end;
while (link.fd >= 0 && (end = link.pending.find('\n')) != std::string::npos)
{
const std::string line = link.pending.substr(0, end);
link.pending.erase(0, end + 1);
char word[16] = {}, frontend[32] = {}, id[16] = {};
const int fields = std::sscanf(line.c_str(), "%15s %31s %15s", word, frontend, id);
if (fields == 3 && std::strcmp(word, "hello") == 0)
{
const char *reply = "ok\n";
if (stale)
reply = "stale\n";
else if (root.empty())
{
const std::string folder = valid_id(id) ? title_folder(id) : "";
if (folder.empty())
{
say("hello from %s of %s: no folder of that title found", frontend, id);
reply = "unknown\n";
}
else
{
root = folder;
title = id;
version = read_small(root + "/webui/version.json");
log_path = root + "/webui-daemon.txt";
rename(log_path.c_str(), (root + "/webui-daemon.1.txt").c_str());
for (const auto &early : early_lines)
say("%s", early.c_str());
early_lines.clear();
say("the title is %s, in %s", title.c_str(), root.c_str());
}
}
else if (title != id)
reply = "other\n";
else if (read_small(root + "/webui/version.json") != version)
{
say("hello from another build of the title: this daemon stops once "
"its requests end");
stale = true;
reply = "stale\n";
}
send_line(link.fd, reply);
if (std::strcmp(reply, "ok\n") == 0)
{
link.hello = true;
link.frontend = frontend;
say("linked: %s (%zu linked)", frontend, links.size());
if (install_sent)
send_line(link.fd, "install\n");
}
else
{
close(link.fd);
link.fd = -1;
}
}
else if (fields >= 2 && std::strcmp(word, "frontend") == 0 && link.hello)
{
link.frontend = frontend;
say("frontend: %s", frontend);
}
}
}
for (auto it = links.begin(); it != links.end();)
if (it->fd < 0)
{
if (it->hello)
say("unlinked: %s", it->frontend.c_str());
it = links.erase(it);
}
else
++it;
show_frontend(links);
const double now = now_s();
bool linked = false;
for (const auto &link : links)
linked |= link.hello;
if (linked)
idle_since = 0;
else if (idle_since == 0)
idle_since = now;
if (start_state == 2 || start_state == 3)
{
if (starter_running)
pthread_join(starter, nullptr);
starter_running = false;
serving = start_state == 2;
start_state = 0;
if (serving)
say("serving the WebUI on %d from %s (%u s busy before)", PS5_WEBUI_HTTP_PORT,
root.c_str(), serve_failures);
else if (serve_failures++ == 0)
say("%d is busy (another daemon's last transfer?); trying every second",
PS5_WEBUI_HTTP_PORT);
}
if (!serving && start_state == 0 && !root.empty() && !stale && now - last_serve_try >= 1.0)
{
last_serve_try = now;
start_state = 1;
start_folder = root;
/* A payload's default thread stack is small; the library scan needs more. */
pthread_attr_t attributes;
pthread_attr_init(&attributes);
pthread_attr_setstacksize(&attributes, 4u << 20);
starter_running =
pthread_create(
&starter, &attributes,
[](void *) -> void *
{
#ifdef PS5_WEBUI_TEST_START_DELAY_MS /* the tests: a start as slow as a big library's */
usleep(PS5_WEBUI_TEST_START_DELAY_MS * 1000);
#endif
start_state =
ps5_webui_start(start_folder.c_str(), PS5_WEBUI_HTTP_PORT, false) ? 2
: 3;
return nullptr;
},
nullptr) == 0;
pthread_attr_destroy(&attributes);
if (!starter_running)
start_state = 3;
}
if (serving && !install_sent && ps5_update::exit_requested())
{
install_sent = true;
say("install requested: asking %zu linked program(s) to close the title", links.size());
for (const auto &link : links)
if (link.hello)
send_line(link.fd, "install\n");
}
if (install_sent && !installed && !linked && now - idle_since >= kInstallSeconds)
{
installed = true;
installed_at = now;
const bool ok = ps5_update::install();
say("install: %s", ok ? "done" : "failed (see .update-result)");
stale = true; /* this daemon is the old build's now */
}
// What must not be cut: transfers in flight, not an open page's idle keep-alive
// connections (counting those, a stale daemon kept 6769 from the new build).
const unsigned busy = ps5_webui_transfers();
const std::string update = ps5_update::status().state;
// A download, or a scraping job, goes on with the title closed and no page open.
const bool updating =
update == "downloading" || update == "verifying" || ps5_webui_scraping();
bool stop = false;
if (root.empty() && !linked && now - started >= kNoHelloSeconds)
{
say("no program of a title linked within %.0f s", kNoHelloSeconds);
stop = true;
}
else if (stale && !busy && !linked && (!installed || now - installed_at >= 15.0))
{
say("stopping for the new build's daemon (no transfer in flight%s)",
ps5_webui_scraping() ? "; the scraping job is saved and resumes there" : "");
stop = true;
}
else if (!root.empty() && !linked && !busy && !updating && !install_sent &&
now - idle_since >= kIdleSeconds)
{
say("no program of the title linked for %.0f s: the title is closed", kIdleSeconds);
stop = true;
}
if (stale && listener >= 0 && !installed)
{
close(listener); /* the new build's daemon can start meanwhile */
listener = -1;
}
if (stop)
break;
}
if (starter_running)
pthread_join(starter, nullptr); /* a start under way ends before the stop */
for (const auto &link : links)
close(link.fd);
if (listener >= 0)
close(listener);
ps5_webui_stop();
say("stopped");
return 0;
}
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