psshfs.c revision 1.19
1 /* $NetBSD: psshfs.c,v 1.19 2007/05/06 19:48:51 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 * 3. The name of the company nor the name of the author may be used to 15 * endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * psshfs: puffs sshfs 33 * 34 * psshfs implements sshfs functionality on top of puffs making it 35 * possible to mount a filesystme through the sftp service. 36 * 37 * psshfs can execute multiple operations in "parallel" by using the 38 * puffs_cc framework for continuations. 39 * 40 * Concurrency control is handled currently by vnode locking (this 41 * will change in the future). Context switch locations are easy to 42 * find by grepping for puffs_framebuf_enqueue_cc(). 43 */ 44 45 #include <sys/cdefs.h> 46 #ifndef lint 47 __RCSID("$NetBSD: psshfs.c,v 1.19 2007/05/06 19:48:51 pooka Exp $"); 48 #endif /* !lint */ 49 50 #include <sys/types.h> 51 52 #include <assert.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <mntopts.h> 56 #include <poll.h> 57 #include <puffs.h> 58 #include <signal.h> 59 #include <stdlib.h> 60 #include <util.h> 61 #include <unistd.h> 62 63 #include "psshfs.h" 64 65 static void pssh_connect(struct psshfs_ctx *, char **); 66 static void usage(void); 67 68 #define SSH_PATH "/usr/bin/ssh" 69 70 static void 71 usage() 72 { 73 74 errx(1, "usage: %s [-es][-p port] [-o opts]user@host:path mountpath", 75 getprogname()); 76 } 77 78 int 79 main(int argc, char *argv[]) 80 { 81 struct psshfs_ctx pctx; 82 struct puffs_usermount *pu; 83 struct puffs_ops *pops; 84 mntoptparse_t mp; 85 char *sshargs[16]; 86 char *userhost; 87 char *hostpath; 88 char *sshport = NULL; 89 int mntflags, pflags, ch; 90 int detach, exportfs; 91 int argi, x; 92 93 setprogname(argv[0]); 94 95 if (argc < 3) 96 usage(); 97 98 mntflags = pflags = exportfs = 0; 99 detach = 1; 100 while ((ch = getopt(argc, argv, "eo:p:s")) != -1) { 101 switch (ch) { 102 case 'e': 103 exportfs = 1; 104 break; 105 case 'o': 106 mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags); 107 if (mp == NULL) 108 err(1, "getmntopts"); 109 freemntopts(mp); 110 break; 111 case 'p': 112 sshport = optarg; 113 break; 114 case 's': 115 detach = 0; 116 break; 117 default: 118 usage(); 119 /*NOTREACHED*/ 120 } 121 } 122 argc -= optind; 123 argv += optind; 124 125 #if 0 126 /* XXX: noatime is mandatory for now */ 127 mntflags |= MNT_NOATIME; 128 #endif 129 130 if (pflags & PUFFS_FLAG_OPDUMP) 131 detach = 0; 132 pflags |= PUFFS_FLAG_BUILDPATH | PUFFS_KFLAG_WTCACHE; 133 134 if (argc != 2) 135 usage(); 136 137 PUFFSOP_INIT(pops); 138 139 PUFFSOP_SET(pops, psshfs, fs, unmount); 140 PUFFSOP_SETFSNOP(pops, sync); /* XXX */ 141 PUFFSOP_SETFSNOP(pops, statvfs); 142 PUFFSOP_SET(pops, psshfs, fs, nodetofh); 143 PUFFSOP_SET(pops, psshfs, fs, fhtonode); 144 145 PUFFSOP_SET(pops, psshfs, node, lookup); 146 PUFFSOP_SET(pops, psshfs, node, create); 147 PUFFSOP_SET(pops, psshfs, node, open); 148 PUFFSOP_SET(pops, psshfs, node, inactive); 149 PUFFSOP_SET(pops, psshfs, node, readdir); 150 PUFFSOP_SET(pops, psshfs, node, getattr); 151 PUFFSOP_SET(pops, psshfs, node, setattr); 152 PUFFSOP_SET(pops, psshfs, node, mkdir); 153 PUFFSOP_SET(pops, psshfs, node, remove); 154 PUFFSOP_SET(pops, psshfs, node, readlink); 155 PUFFSOP_SET(pops, psshfs, node, rmdir); 156 PUFFSOP_SET(pops, psshfs, node, symlink); 157 PUFFSOP_SET(pops, psshfs, node, rename); 158 PUFFSOP_SET(pops, psshfs, node, read); 159 PUFFSOP_SET(pops, psshfs, node, write); 160 PUFFSOP_SET(pops, psshfs, node, reclaim); 161 162 memset(&pctx, 0, sizeof(pctx)); 163 pctx.mounttime = time(NULL); 164 165 userhost = argv[0]; 166 hostpath = strchr(userhost, ':'); 167 if (hostpath) { 168 *hostpath++ = '\0'; 169 pctx.mountpath = hostpath; 170 } else 171 pctx.mountpath = "."; 172 173 /* xblah */ 174 argi = 0; 175 sshargs[argi++] = SSH_PATH; 176 sshargs[argi++] = argv[0]; 177 sshargs[argi++] = "-oClearAllForwardings=yes"; 178 sshargs[argi++] = "-a"; 179 sshargs[argi++] = "-x"; 180 sshargs[argi++] = "-s"; 181 if (sshport) { 182 sshargs[argi++] = "-p"; 183 sshargs[argi++] = sshport; 184 } 185 sshargs[argi++] = "sftp"; 186 sshargs[argi] = 0; 187 188 pu = puffs_init(pops, "ppshfs", &pctx, pflags); 189 if (pu == NULL) 190 err(1, "puffs_init"); 191 192 pssh_connect(&pctx, sshargs); 193 194 if (puffs_setblockingmode(pu, PUFFSDEV_NONBLOCK) == -1) 195 err(1, "setblockingmode"); 196 if (exportfs) 197 puffs_setfhsize(pu, sizeof(struct psshfs_fid), 198 PUFFS_FHFLAG_NFSV2 | PUFFS_FHFLAG_NFSV3); 199 200 if (puffs_domount(pu, argv[1], mntflags) == -1) 201 err(1, "puffs_domount"); 202 203 if (psshfs_domount(pu) != 0) 204 errx(1, "psshfs_domount"); 205 206 x = 1; 207 if (ioctl(pctx.sshfd, FIONBIO, &x) == -1) 208 err(1, "nonblocking descriptor"); 209 210 if (detach) 211 daemon(1, 0); 212 213 return puffs_framebuf_eventloop(pu, pctx.sshfd, 214 psbuf_read, psbuf_write, psbuf_cmp, NULL); 215 } 216 217 static void 218 pssh_connect(struct psshfs_ctx *pctx, char **sshargs) 219 { 220 int fds[2]; 221 pid_t pid; 222 223 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) 224 err(1, "socketpair"); 225 226 pid = fork(); 227 switch (pid) { 228 case -1: 229 err(1, "fork"); 230 /*NOTREACHED*/ 231 case 0: /* child */ 232 if (dup2(fds[0], STDIN_FILENO) == -1) 233 err(1, "child dup2"); 234 if (dup2(fds[0], STDOUT_FILENO) == -1) 235 err(1, "child dup2"); 236 close(fds[0]); 237 close(fds[1]); 238 execvp(sshargs[0], sshargs); 239 break; 240 default: 241 pctx->sshpid = pid; 242 pctx->sshfd = fds[1]; 243 close(fds[0]); 244 break; 245 } 246 } 247
Indexes created Thu Oct 16 14:10:15 GMT 2025