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      1 /*	$NetBSD: ninepuffs.c,v 1.35 2025/03/10 21:21:20 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2007  Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 /*
     29  * 9puffs: access a 9P file server as a vfs via puffs
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __RCSID("$NetBSD: ninepuffs.c,v 1.35 2025/03/10 21:21:20 riastradh Exp $");
     35 #endif /* !lint */
     36 
     37 #include <sys/types.h>
     38 #include <sys/socket.h>
     39 #include <sys/poll.h>
     40 
     41 #include <netinet/in.h>
     42 
     43 #include <assert.h>
     44 #include <err.h>
     45 #include <errno.h>
     46 #include <netdb.h>
     47 #include <pwd.h>
     48 #include <puffs.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <unistd.h>
     52 
     53 #include "ninepuffs.h"
     54 #include "nineproto.h"
     55 
     56 #define DEFPORT_9P "564" /* "9pfs", but don't depend on it being in services */
     57 
     58 __dead static void
     59 usage(void)
     60 {
     61 
     62 	fprintf(stderr, "usage: %s [-46su] [-o mntopts] [-p port] "
     63 	    "[user@]server[:path] mountpoint\n", getprogname());
     64 	fprintf(stderr, "       %s -c [-su] [-o mntopts] device mountpoint\n",
     65 	    getprogname());
     66 	exit(1);
     67 }
     68 
     69 /*
     70  * TCP connection to 9P file server.
     71  * Return connected socket or exit with error.
     72  */
     73 static int
     74 serverconnect(const char *hostname, const char *portname, int family)
     75 {
     76 	int ret;
     77 
     78 	struct addrinfo hints;
     79 	memset(&hints, 0, sizeof(hints));
     80 	hints.ai_family = family;
     81 	hints.ai_socktype = SOCK_STREAM;
     82 
     83 	if (portname == NULL) {
     84 		portname = DEFPORT_9P;
     85 		hints.ai_flags |= AI_NUMERICSERV;
     86 	}
     87 
     88 	struct addrinfo *ai0;
     89 	ret = getaddrinfo(hostname, portname, &hints, &ai0);
     90 	if (ret != 0)
     91 		errx(EXIT_FAILURE, "%s", gai_strerror(ret));
     92 
     93 	int s = -1;
     94 	const char *cause = NULL;
     95 	for (struct addrinfo *ai = ai0; ai != NULL; ai = ai->ai_next) {
     96 		s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
     97 		if (s < 0) {
     98 			cause = "socket";
     99 			continue;
    100 		}
    101 
    102 		const int opt = 1;
    103 		ret = setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
    104 		if (ret < 0) {
    105 			cause = "SO_NOSIGPIPE";
    106 			continue;
    107 		}
    108 
    109 		ret = connect(s, ai->ai_addr, ai->ai_addrlen);
    110 		if (ret < 0) {
    111 			close(s);
    112 			s = -1;
    113 			cause = "connect";
    114 			continue;
    115 		}
    116 	}
    117 
    118 	if (s < 0)
    119 		err(EXIT_FAILURE, "%s", cause);
    120 
    121 	freeaddrinfo(ai0);
    122 	return s;
    123 }
    124 
    125 static int
    126 open_cdev(const char *path)
    127 {
    128 	int s;
    129 
    130 	s = open(path, O_RDWR, 0);
    131 	if (s == -1)
    132 		err(1, "%s", path);
    133 	return s;
    134 }
    135 
    136 int
    137 main(int argc, char *argv[])
    138 {
    139 	struct puffs9p p9p;
    140 	struct puffs_usermount *pu;
    141 	struct puffs_ops *pops;
    142 	struct puffs_node *pn_root;
    143 	mntoptparse_t mp;
    144 	int family;
    145 	const char *user, *srvhost, *srvpath;
    146 	char *p;
    147 	const char *port;
    148 	int mntflags, pflags, ch;
    149 	int detach;
    150 	int protover;
    151 	int server;
    152 	bool cachename = false;
    153 
    154 	setprogname(argv[0]);
    155 
    156 	if (argc < 2)
    157 		usage();
    158 
    159 	mntflags = pflags = 0;
    160 	detach = 1;
    161 #ifdef INET6
    162 	family = AF_UNSPEC;
    163 #else
    164 	family = AF_INET;
    165 #endif
    166 	port = NULL;
    167 	protover = P9PROTO_VERSION;
    168 	server = P9P_SERVER_TCP;
    169 
    170 	while ((ch = getopt(argc, argv, "46cCo:p:su")) != -1) {
    171 		switch (ch) {
    172 		case '4':
    173 			family = AF_INET;
    174 			break;
    175 		case '6':
    176 #ifdef INET6
    177 			family = AF_INET6;
    178 			break;
    179 #else
    180 			errno = EPFNOSUPPORT;
    181 			err(EXIT_FAILURE, "IPv6");
    182 			/* NOTREACHED */
    183 #endif
    184 		case 'c':
    185 			server = P9P_SERVER_CDEV;
    186 			break;
    187 		case 'C':
    188 			cachename = true;
    189 			break;
    190 		case 'o':
    191 			mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags);
    192 			if (mp == NULL)
    193 				err(1, "getmntopts");
    194 			freemntopts(mp);
    195 			break;
    196 		case 'p':
    197 			port = optarg;
    198 			break;
    199 		case 's':
    200 			detach = 0;
    201 			break;
    202 		case 'u':
    203 			protover = P9PROTO_VERSION_U;
    204 			break;
    205 		default:
    206 			usage();
    207 			/*NOTREACHED*/
    208 		}
    209 	}
    210 	argc -= optind;
    211 	argv += optind;
    212 
    213 	if (argc != 2)
    214 		usage();
    215 
    216 	if (pflags & PUFFS_FLAG_OPDUMP)
    217 		detach = 0;
    218 	pflags |= PUFFS_KFLAG_WTCACHE | PUFFS_KFLAG_IAONDEMAND;
    219 
    220 	if (!cachename)
    221 		pflags |= PUFFS_KFLAG_NOCACHE_NAME;
    222 
    223 	PUFFSOP_INIT(pops);
    224 
    225 	PUFFSOP_SET(pops, puffs9p, fs, unmount);
    226 	PUFFSOP_SETFSNOP(pops, sync);
    227 	PUFFSOP_SETFSNOP(pops, statvfs);
    228 
    229 	PUFFSOP_SET(pops, puffs9p, node, lookup);
    230 	PUFFSOP_SET(pops, puffs9p, node, readdir);
    231 	PUFFSOP_SET(pops, puffs9p, node, getattr);
    232 	PUFFSOP_SET(pops, puffs9p, node, setattr);
    233 	PUFFSOP_SET(pops, puffs9p, node, create);
    234 	PUFFSOP_SET(pops, puffs9p, node, open);
    235 	PUFFSOP_SET(pops, puffs9p, node, mkdir);
    236 	PUFFSOP_SET(pops, puffs9p, node, remove);
    237 	PUFFSOP_SET(pops, puffs9p, node, rmdir);
    238 	PUFFSOP_SET(pops, puffs9p, node, read);
    239 	PUFFSOP_SET(pops, puffs9p, node, write);
    240 	PUFFSOP_SET(pops, puffs9p, node, rename);
    241 	PUFFSOP_SET(pops, puffs9p, node, inactive);
    242 	PUFFSOP_SET(pops, puffs9p, node, reclaim);
    243 	PUFFSOP_SET(pops, puffs9p, node, pathconf);
    244 #if 0
    245 	PUFFSOP_SET(pops, puffs9p, node, mknod);
    246 #endif
    247 
    248 	pu = puffs_init(pops, argv[0], "9p", &p9p, pflags);
    249 	if (pu == NULL)
    250 		err(1, "puffs_init");
    251 
    252 	memset(&p9p, 0, sizeof(p9p));
    253 	p9p.maxreq = P9P_DEFREQLEN;
    254 	p9p.nextfid = 1;
    255 	p9p.protover = protover;
    256 	p9p.server = server;
    257 
    258 	/* user@ */
    259 	if ((p = strchr(argv[0], '@')) != NULL) {
    260 		*p = '\0';
    261 		srvhost = p+1;
    262 		user = argv[0];
    263 	} else {
    264 		struct passwd *pw;
    265 
    266 		srvhost = argv[0];
    267 		pw = getpwuid(getuid());
    268 		if (pw == NULL)
    269 			err(1, "getpwuid");
    270 		user = pw->pw_name;
    271 	}
    272 
    273 	/* [host] or [host]:/path with square brackets around host */
    274 	if (server == P9P_SERVER_TCP && *srvhost == '[') {
    275 		++srvhost;
    276 		if ((p = strchr(srvhost, ']')) == NULL)
    277 			errx(EXIT_FAILURE, "Missing bracket after the host name");
    278 		*p++ = '\0';
    279 		if (*p == '\0')		/* [host] */
    280 			srvpath = "/";
    281 		else if (*p == ':')	/* [host]:path */
    282 			srvpath = p+1;
    283 		else			/* [foo]bar */
    284 			errx(EXIT_FAILURE, "Invalid brackets in the host name");
    285 
    286 	} else { /* host or host:/path without brackets around host */
    287 		if ((p = strchr(srvhost, ':')) != NULL) {
    288 			*p = '\0';
    289 			srvpath = p+1;
    290 		} else {
    291 			srvpath = "/";
    292 		}
    293 	}
    294 
    295 	if (*srvpath == '\0')
    296 		errx(1, "Empty path");
    297 	if (*srvpath != '/')
    298 		errx(1, "%s: Not an absolute path", srvpath);
    299 
    300 
    301 	if (p9p.server == P9P_SERVER_TCP) {
    302 		p9p.servsock = serverconnect(srvhost, port, family);
    303 	} else {
    304 		/* path to a vio9p(4) device, e.g., /dev/vio9p0 */
    305 		p9p.servsock = open_cdev(argv[0]);
    306 	}
    307 
    308 	if ((pn_root = p9p_handshake(pu, user, srvpath)) == NULL) {
    309 		close(p9p.servsock);
    310 		puffs_exit(pu, 1);
    311 		exit(1);
    312 	}
    313 
    314 	puffs_framev_init(pu, p9pbuf_read, p9pbuf_write, p9pbuf_cmp, NULL,
    315 	    puffs_framev_unmountonclose);
    316 	if (puffs_framev_addfd(pu, p9p.servsock,
    317 	    PUFFS_FBIO_READ | PUFFS_FBIO_WRITE) == -1)
    318 		err(1, "puffs_framebuf_addfd");
    319 
    320 	if (detach)
    321 		if (puffs_daemon(pu, 1, 1) == -1)
    322 			err(1, "puffs_daemon");
    323 
    324 	if (puffs_mount(pu, argv[1], mntflags, pn_root) == -1)
    325 		err(1, "puffs_mount");
    326 	if (puffs_setblockingmode(pu, PUFFSDEV_NONBLOCK) == -1)
    327 		err(1, "setblockingmode");
    328 
    329 	if (puffs_mainloop(pu) == -1)
    330 		err(1, "mainloop");
    331 	close(p9p.servsock);
    332 	puffs_exit(pu, 1);
    333 
    334 	return 0;
    335 }
    336