psshfs.c revision 1.46
1 /* $NetBSD: psshfs.c,v 1.46 2007/11/30 16:24:04 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2006 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 * psshfs: puffs sshfs 30 * 31 * psshfs implements sshfs functionality on top of puffs making it 32 * possible to mount a filesystme through the sftp service. 33 * 34 * psshfs can execute multiple operations in "parallel" by using the 35 * puffs_cc framework for continuations. 36 * 37 * Concurrency control is handled currently by vnode locking (this 38 * will change in the future). Context switch locations are easy to 39 * find by grepping for puffs_framebuf_enqueue_cc(). 40 */ 41 42 #include <sys/cdefs.h> 43 #ifndef lint 44 __RCSID("$NetBSD: psshfs.c,v 1.46 2007/11/30 16:24:04 pooka Exp $"); 45 #endif /* !lint */ 46 47 #include <sys/types.h> 48 49 #include <assert.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <mntopts.h> 53 #include <paths.h> 54 #include <poll.h> 55 #include <puffs.h> 56 #include <signal.h> 57 #include <stdlib.h> 58 #include <util.h> 59 #include <unistd.h> 60 61 #include "psshfs.h" 62 63 static void pssh_connect(struct psshfs_ctx *, char **); 64 static void psshfs_loopfn(struct puffs_usermount *); 65 static void usage(void); 66 static void add_ssharg(char ***, int *, char *); 67 68 #define SSH_PATH "/usr/bin/ssh" 69 70 unsigned int max_reads; 71 static int sighup; 72 73 static void 74 add_ssharg(char ***sshargs, int *nargs, char *arg) 75 { 76 77 *sshargs = realloc(*sshargs, (*nargs + 2) * sizeof(char*)); 78 if (!*sshargs) 79 err(1, "realloc"); 80 (*sshargs)[(*nargs)++] = arg; 81 (*sshargs)[*nargs] = NULL; 82 } 83 84 static void 85 usage() 86 { 87 88 fprintf(stderr, "usage: %s " 89 "[-es] [-O sshopt=value] [-o opts] user@host:path mountpath\n", 90 getprogname()); 91 exit(1); 92 } 93 94 static void 95 takehup(int sig) 96 { 97 98 sighup = 1; 99 } 100 101 int 102 main(int argc, char *argv[]) 103 { 104 struct psshfs_ctx pctx; 105 struct puffs_usermount *pu; 106 struct puffs_ops *pops; 107 mntoptparse_t mp; 108 char **sshargs; 109 char *userhost; 110 char *hostpath; 111 int mntflags, pflags, ch; 112 int detach; 113 int exportfs, refreshival; 114 int nargs, x; 115 116 setprogname(argv[0]); 117 118 if (argc < 3) 119 usage(); 120 121 mntflags = pflags = exportfs = nargs = 0; 122 detach = 1; 123 refreshival = DEFAULTREFRESH; 124 sshargs = NULL; 125 add_ssharg(&sshargs, &nargs, SSH_PATH); 126 add_ssharg(&sshargs, &nargs, "-axs"); 127 add_ssharg(&sshargs, &nargs, "-oClearAllForwardings=yes"); 128 129 while ((ch = getopt(argc, argv, "eo:O:r:st:")) != -1) { 130 switch (ch) { 131 case 'e': 132 exportfs = 1; 133 break; 134 case 'O': 135 add_ssharg(&sshargs, &nargs, "-o"); 136 add_ssharg(&sshargs, &nargs, optarg); 137 break; 138 case 'o': 139 mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags); 140 if (mp == NULL) 141 err(1, "getmntopts"); 142 freemntopts(mp); 143 break; 144 case 'r': 145 max_reads = atoi(optarg); 146 break; 147 case 's': 148 detach = 0; 149 break; 150 case 't': 151 refreshival = atoi(optarg); 152 if (refreshival < 0 && refreshival != -1) 153 errx(1, "invalid timeout %d", refreshival); 154 break; 155 default: 156 usage(); 157 /*NOTREACHED*/ 158 } 159 } 160 argc -= optind; 161 argv += optind; 162 163 if (pflags & PUFFS_FLAG_OPDUMP) 164 detach = 0; 165 pflags |= PUFFS_FLAG_BUILDPATH; 166 pflags |= PUFFS_KFLAG_WTCACHE | PUFFS_KFLAG_IAONDEMAND; 167 168 if (argc != 2) 169 usage(); 170 171 PUFFSOP_INIT(pops); 172 173 PUFFSOP_SET(pops, psshfs, fs, unmount); 174 PUFFSOP_SETFSNOP(pops, sync); /* XXX */ 175 PUFFSOP_SETFSNOP(pops, statvfs); 176 PUFFSOP_SET(pops, psshfs, fs, nodetofh); 177 PUFFSOP_SET(pops, psshfs, fs, fhtonode); 178 179 PUFFSOP_SET(pops, psshfs, node, lookup); 180 PUFFSOP_SET(pops, psshfs, node, create); 181 PUFFSOP_SET(pops, psshfs, node, open); 182 PUFFSOP_SET(pops, psshfs, node, inactive); 183 PUFFSOP_SET(pops, psshfs, node, readdir); 184 PUFFSOP_SET(pops, psshfs, node, getattr); 185 PUFFSOP_SET(pops, psshfs, node, setattr); 186 PUFFSOP_SET(pops, psshfs, node, mkdir); 187 PUFFSOP_SET(pops, psshfs, node, remove); 188 PUFFSOP_SET(pops, psshfs, node, readlink); 189 PUFFSOP_SET(pops, psshfs, node, rmdir); 190 PUFFSOP_SET(pops, psshfs, node, symlink); 191 PUFFSOP_SET(pops, psshfs, node, rename); 192 PUFFSOP_SET(pops, psshfs, node, read); 193 PUFFSOP_SET(pops, psshfs, node, write); 194 PUFFSOP_SET(pops, psshfs, node, reclaim); 195 196 pu = puffs_init(pops, argv[0], "psshfs", &pctx, pflags); 197 if (pu == NULL) 198 err(1, "puffs_init"); 199 200 memset(&pctx, 0, sizeof(pctx)); 201 pctx.mounttime = time(NULL); 202 pctx.refreshival = refreshival; 203 204 userhost = argv[0]; 205 hostpath = strchr(userhost, ':'); 206 if (hostpath) { 207 *hostpath++ = '\0'; 208 pctx.mountpath = hostpath; 209 } else 210 pctx.mountpath = "."; 211 212 add_ssharg(&sshargs, &nargs, argv[0]); 213 add_ssharg(&sshargs, &nargs, "sftp"); 214 215 signal(SIGHUP, takehup); 216 puffs_ml_setloopfn(pu, psshfs_loopfn); 217 218 pssh_connect(&pctx, sshargs); 219 220 if (exportfs) 221 puffs_setfhsize(pu, sizeof(struct psshfs_fid), 222 PUFFS_FHFLAG_NFSV2 | PUFFS_FHFLAG_NFSV3); 223 224 if (psshfs_domount(pu) != 0) 225 errx(1, "psshfs_domount"); 226 x = 1; 227 if (ioctl(pctx.sshfd, FIONBIO, &x) == -1) 228 err(1, "nonblocking descriptor"); 229 230 puffs_framev_init(pu, psbuf_read, psbuf_write, psbuf_cmp, NULL, 231 puffs_framev_unmountonclose); 232 if (puffs_framev_addfd(pu, pctx.sshfd, 233 PUFFS_FBIO_READ | PUFFS_FBIO_WRITE) == -1) 234 err(1, "framebuf addfd"); 235 236 if (detach) 237 if (puffs_daemon(pu, 1, 1) == -1) 238 err(1, "puffs_daemon"); 239 240 if (puffs_mount(pu, argv[1], mntflags, puffs_getroot(pu)) == -1) 241 err(1, "puffs_mount"); 242 if (puffs_setblockingmode(pu, PUFFSDEV_NONBLOCK) == -1) 243 err(1, "setblockingmode"); 244 245 if (puffs_mainloop(pu) == -1) 246 err(1, "mainloop"); 247 248 return 0; 249 } 250 251 static void 252 pssh_connect(struct psshfs_ctx *pctx, char **sshargs) 253 { 254 int fds[2]; 255 pid_t pid; 256 int dnfd; 257 258 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) 259 err(1, "socketpair"); 260 261 pid = fork(); 262 switch (pid) { 263 case -1: 264 err(1, "fork"); 265 /*NOTREACHED*/ 266 case 0: /* child */ 267 if (dup2(fds[0], STDIN_FILENO) == -1) 268 err(1, "child dup2"); 269 if (dup2(fds[0], STDOUT_FILENO) == -1) 270 err(1, "child dup2"); 271 close(fds[0]); 272 close(fds[1]); 273 274 dnfd = open(_PATH_DEVNULL, O_RDWR); 275 if (dnfd != -1) 276 dup2(dnfd, STDERR_FILENO); 277 278 execvp(sshargs[0], sshargs); 279 break; 280 default: 281 pctx->sshpid = pid; 282 pctx->sshfd = fds[1]; 283 close(fds[0]); 284 break; 285 } 286 } 287 288 static void * 289 invalone(struct puffs_usermount *pu, struct puffs_node *pn, void *arg) 290 { 291 struct psshfs_node *psn = pn->pn_data; 292 293 psn->attrread = 0; 294 psn->dentread = 0; 295 psn->slread = 0; 296 297 return NULL; 298 } 299 300 static void 301 psshfs_loopfn(struct puffs_usermount *pu) 302 { 303 304 if (sighup) { 305 puffs_pn_nodewalk(pu, invalone, NULL); 306 sighup = 0; 307 } 308 } 309
Indexes created Wed Oct 15 07:09:58 GMT 2025