301 lines
10 KiB
C
301 lines
10 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/arraylist.internal.h"
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#include "libc/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/errno.h"
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#include "libc/fmt/fmt.h"
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#include "libc/log/check.h"
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#include "libc/log/log.h"
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#include "libc/runtime/gc.h"
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#include "libc/runtime/interruptiblecall.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/af.h"
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#include "libc/sysv/consts/exit.h"
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#include "libc/sysv/consts/ipproto.h"
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#include "libc/sysv/consts/msg.h"
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#include "libc/sysv/consts/poll.h"
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#include "libc/sysv/consts/so.h"
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#include "libc/sysv/consts/sock.h"
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#include "libc/sysv/consts/sol.h"
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#include "libc/x/x.h"
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#include "third_party/getopt/getopt.h"
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/**
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* @fileoverview Asynchronous TCP/UDP Echo Server.
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*
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* make -j8 o/default/tool/net/echoserver.com
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* o/default/tool/net/echoserver.com udp:0.0.0.0:7 tcp:0.0.0.0:7
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*/
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enum SocketKind {
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kSocketServer,
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kSocketClient,
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};
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struct Message {
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struct iovec data;
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struct sockaddr_in dest;
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uint32_t destsize;
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};
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struct Messages {
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size_t i, n;
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struct Message *p;
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};
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struct Socket {
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int64_t fd;
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enum SocketKind kind;
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int type;
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int protocol;
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struct sockaddr_in addr;
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struct Messages egress; /* LIFO */
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};
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struct Sockets {
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size_t i, n;
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struct Socket *p;
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};
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struct Polls {
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size_t i, n;
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struct pollfd *p;
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};
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struct Sockets g_sockets;
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struct Polls g_polls;
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nodiscard char *DescribeAddress(struct sockaddr_in *addr) {
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char ip4buf[16];
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return xasprintf("%s:%hu",
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inet_ntop(addr->sin_family, &addr->sin_addr.s_addr, ip4buf,
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sizeof(ip4buf)),
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ntohs(addr->sin_port));
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}
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nodiscard char *DescribeSocket(struct Socket *s) {
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return xasprintf("%s:%s", s->protocol == IPPROTO_UDP ? "udp" : "tcp",
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gc(DescribeAddress(&s->addr)));
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}
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noreturn void ShowUsageAndExit(bool iserror) {
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FILE *f = iserror ? stderr : stdout;
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int rc = iserror ? EXIT_FAILURE : EXIT_SUCCESS;
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fprintf(f, "%s: %s %s\n", "Usage", g_argv[0], "PROTOCOL:ADDR:PORT...");
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exit(rc);
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}
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void GetFlags(int argc, char *argv[]) {
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int opt;
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while ((opt = getopt(argc, argv, "h")) != -1) {
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switch (opt) {
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case 'h':
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ShowUsageAndExit(false);
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default:
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ShowUsageAndExit(true);
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}
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}
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if (optind == argc) ShowUsageAndExit(true);
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}
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void AddSocket(const struct Socket *s) {
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struct pollfd pfd;
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pfd.fd = s->fd;
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pfd.events = POLLIN;
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pfd.revents = 0;
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CHECK_NE(-1L, append(&g_sockets, s));
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CHECK_NE(-1L, append(&g_polls, &pfd));
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}
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void RemoveSocket(size_t i) {
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DCHECK_LT(i, g_sockets.i);
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LOGF("removing: %s", gc(DescribeSocket(&g_sockets.p[i])));
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CHECK_NE(-1, close(g_sockets.p[i].fd));
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while (g_sockets.p[i].egress.i) {
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free(g_sockets.p[i].egress.p[g_sockets.p[i].egress.i - 1].data.iov_base);
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}
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memcpy(&g_sockets.p[i], &g_sockets.p[i + 1],
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(intptr_t)&g_sockets.p[g_sockets.i] - (intptr_t)&g_sockets.p[i + 1]);
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memcpy(&g_polls.p[i], &g_polls.p[i + 1],
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(intptr_t)&g_polls.p[g_polls.i] - (intptr_t)&g_polls.p[i + 1]);
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g_sockets.i--;
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g_polls.i--;
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}
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void GetListeningAddressesFromCommandLine(int argc, char *argv[]) {
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int i;
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for (i = optind; i < argc; ++i) {
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struct Socket server;
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memset(&server, 0, sizeof(server));
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char scheme[4];
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unsigned char *ip4 = (unsigned char *)&server.addr.sin_addr.s_addr;
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uint16_t port;
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if (sscanf(argv[i], "%3s:%hhu.%hhu.%hhu.%hhu:%hu", scheme, &ip4[0], &ip4[1],
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&ip4[2], &ip4[3], &port) != 6) {
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fprintf(stderr, "error: bad ip4 uri\n");
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ShowUsageAndExit(true);
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}
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server.fd = -1;
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server.kind = kSocketServer;
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server.addr.sin_family = AF_INET;
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server.addr.sin_port = htons(port);
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if (strcasecmp(scheme, "tcp") == 0) {
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server.type = SOCK_STREAM;
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server.protocol = IPPROTO_TCP;
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} else if (strcasecmp(scheme, "udp") == 0) {
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server.type = SOCK_DGRAM;
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server.protocol = IPPROTO_UDP;
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} else {
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fprintf(stderr, "%s: %s\n", "error", "bad scheme (should be tcp or udp)");
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ShowUsageAndExit(true);
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}
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AddSocket(&server);
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}
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}
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void BeginListeningForIncomingTraffic(void) {
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size_t i;
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for (i = 0; i < g_sockets.i; ++i) {
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int yes = 1;
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struct Socket *s = &g_sockets.p[i];
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CHECK_NE(-1L,
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(g_polls.p[i].fd = s->fd = socket(
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s->addr.sin_family, s->type | SOCK_NONBLOCK, s->protocol)));
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CHECK_NE(-1L,
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setsockopt(s->fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)));
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CHECK_NE(-1, bind(s->fd, &s->addr, sizeof(s->addr)));
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if (s->protocol == IPPROTO_TCP) {
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CHECK_NE(-1, listen(s->fd, 1));
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}
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uint32_t addrsize = sizeof(s->addr);
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CHECK_NE(-1, getsockname(s->fd, &s->addr, &addrsize));
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LOGF("listening on %s", gc(DescribeSocket(s)));
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}
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}
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void AcceptConnection(size_t i) {
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struct Socket *server = &g_sockets.p[i];
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struct Socket client;
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memset(&client, 0, sizeof(client));
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client.kind = kSocketClient;
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client.type = server->type;
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client.protocol = server->protocol;
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uint32_t addrsize = sizeof(client.addr);
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CHECK_NE(-1L, (client.fd = accept4(server->fd, &client.addr, &addrsize,
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SOCK_NONBLOCK)));
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LOGF("%s accepted %s", gc(DescribeSocket(server)),
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gc(DescribeSocket(&client)));
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AddSocket(&client);
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}
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bool ReceiveData(size_t i) {
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ssize_t got;
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struct Message msg;
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bool isudp = g_sockets.p[i].protocol == IPPROTO_UDP;
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memset(&msg, 0, sizeof(msg));
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msg.destsize = sizeof(msg.dest);
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msg.data.iov_len = PAGESIZE;
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msg.data.iov_base = xmalloc(msg.data.iov_len);
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CHECK_NE(-1L, (got = recvfrom(g_sockets.p[i].fd, msg.data.iov_base,
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msg.data.iov_len, 0, isudp ? &msg.dest : NULL,
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isudp ? &msg.destsize : NULL)));
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if (0 < got && got <= msg.data.iov_len) {
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LOGF("%s received %lu bytes from %s", gc(DescribeSocket(&g_sockets.p[i])),
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got, gc(DescribeAddress(&msg.dest)));
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msg.data.iov_base = xrealloc(msg.data.iov_base, (msg.data.iov_len = got));
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append(&g_sockets.p[i].egress, &msg);
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g_polls.p[i].events |= POLLOUT;
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return true;
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} else {
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RemoveSocket(i);
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free_s(&msg.data.iov_base);
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return false;
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}
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}
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void SendData(size_t i) {
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ssize_t sent;
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struct Socket *s = &g_sockets.p[i];
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struct Message *msg = &s->egress.p[s->egress.i - 1];
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bool isudp = s->protocol == IPPROTO_UDP;
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DCHECK(s->egress.i);
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CHECK_NE(-1L, (sent = sendto(s->fd, msg->data.iov_base, msg->data.iov_len, 0,
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isudp ? &msg->dest : NULL,
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isudp ? msg->destsize : 0)));
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LOGF("%s sent %lu bytes to %s", gc(DescribeSocket(s)), msg->data.iov_len,
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gc(DescribeAddress(&msg->dest)));
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if (!(msg->data.iov_len -= min((size_t)sent, (size_t)msg->data.iov_len))) {
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free_s(&msg->data.iov_base);
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if (!--s->egress.i) {
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g_polls.p[i].events &= ~POLLOUT;
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}
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}
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}
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void HandleSomeNetworkTraffic(void) {
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size_t i;
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int eventcount;
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CHECK_GE((eventcount = poll(g_polls.p, g_polls.i, -1)), 0);
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for (i = 0; eventcount && i < g_sockets.i; ++i) {
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if (!g_polls.p[i].revents) continue;
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--eventcount;
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if (g_polls.p[i].revents & (POLLERR | POLLHUP | POLLNVAL)) {
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CHECK_EQ(kSocketClient, g_sockets.p[i].kind);
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RemoveSocket(i);
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} else {
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if (g_polls.p[i].revents & POLLIN) {
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if (g_sockets.p[i].kind == kSocketServer &&
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g_sockets.p[i].protocol == IPPROTO_TCP) {
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AcceptConnection(i);
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} else {
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if (!ReceiveData(i)) continue;
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}
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}
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if (g_polls.p[i].revents & POLLOUT) {
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SendData(i);
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}
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}
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}
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}
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void EchoServer(void) {
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for (;;) HandleSomeNetworkTraffic();
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}
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int main(int argc, char *argv[]) {
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STATIC_YOINK("isatty");
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GetFlags(argc, argv);
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GetListeningAddressesFromCommandLine(argc, argv);
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BeginListeningForIncomingTraffic();
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struct InterruptibleCall icall;
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memset(&icall, 0, sizeof(icall));
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interruptiblecall(&icall, (void *)EchoServer, 0, 0, 0, 0);
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fputc('\r', stderr);
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LOGF("%s", "shutting down...");
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size_t i;
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for (i = g_sockets.i; i; --i) RemoveSocket(i - 1);
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return 0;
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}
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