psshfs.c revision 1.21
1 /* $NetBSD: psshfs.c,v 1.21 2007/05/09 19:54:39 tnn 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 1.21 2007/05/09 19:54:39 tnn 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 static void add_ssharg(char ***, int *, char *); 68 69 #define SSH_PATH "/usr/bin/ssh" 70 71 static void 72 add_ssharg(char ***sshargs, int *nargs, char *arg) 73 { 74 75 *sshargs = realloc(*sshargs, (*nargs + 2) * sizeof(char*)); 76 if (!*sshargs) 77 err(1, "realloc"); 78 (*sshargs)[(*nargs)++] = arg; 79 (*sshargs)[*nargs] = NULL; 80 } 81 82 static void 83 usage() 84 { 85 86 errx(1, "usage: %s " 87 "[-es] [-O sshopt value] [-o opts] user@host:path mountpath", 88 getprogname()); 89 } 90 91 int 92 main(int argc, char *argv[]) 93 { 94 struct psshfs_ctx pctx; 95 struct puffs_usermount *pu; 96 struct puffs_ops *pops; 97 mntoptparse_t mp; 98 char **sshargs; 99 char *arg; 100 char *userhost; 101 char *hostpath; 102 int mntflags, pflags, ch; 103 int detach, exportfs; 104 int nargs, x; 105 106 setprogname(argv[0]); 107 108 if (argc < 3) 109 usage(); 110 111 mntflags = pflags = exportfs = nargs = 0; 112 detach = 1; 113 sshargs = NULL; 114 add_ssharg(&sshargs, &nargs, SSH_PATH); 115 add_ssharg(&sshargs, &nargs, "-axs"); 116 add_ssharg(&sshargs, &nargs, "-oClearAllForwardings=yes"); 117 118 while ((ch = getopt(argc, argv, "eo:O:s")) != -1) { 119 switch (ch) { 120 case 'e': 121 exportfs = 1; 122 break; 123 case 'O': 124 if (optind == argc) 125 usage(); 126 if (asprintf(&arg, "-o%s=%s", optarg, 127 argv[optind]) == -1) 128 err(1, "asprintf"); 129 add_ssharg(&sshargs, &nargs, arg); 130 optind++; 131 break; 132 case 'o': 133 mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags); 134 if (mp == NULL) 135 err(1, "getmntopts"); 136 freemntopts(mp); 137 break; 138 case 's': 139 detach = 0; 140 break; 141 default: 142 usage(); 143 /*NOTREACHED*/ 144 } 145 } 146 argc -= optind; 147 argv += optind; 148 149 #if 0 150 /* XXX: noatime is mandatory for now */ 151 mntflags |= MNT_NOATIME; 152 #endif 153 154 if (pflags & PUFFS_FLAG_OPDUMP) 155 detach = 0; 156 pflags |= PUFFS_FLAG_BUILDPATH; 157 pflags |= PUFFS_KFLAG_WTCACHE | PUFFS_KFLAG_IAONDEMAND; 158 159 if (argc != 2) 160 usage(); 161 162 PUFFSOP_INIT(pops); 163 164 PUFFSOP_SET(pops, psshfs, fs, unmount); 165 PUFFSOP_SETFSNOP(pops, sync); /* XXX */ 166 PUFFSOP_SETFSNOP(pops, statvfs); 167 PUFFSOP_SET(pops, psshfs, fs, nodetofh); 168 PUFFSOP_SET(pops, psshfs, fs, fhtonode); 169 170 PUFFSOP_SET(pops, psshfs, node, lookup); 171 PUFFSOP_SET(pops, psshfs, node, create); 172 PUFFSOP_SET(pops, psshfs, node, open); 173 PUFFSOP_SET(pops, psshfs, node, inactive); 174 PUFFSOP_SET(pops, psshfs, node, readdir); 175 PUFFSOP_SET(pops, psshfs, node, getattr); 176 PUFFSOP_SET(pops, psshfs, node, setattr); 177 PUFFSOP_SET(pops, psshfs, node, mkdir); 178 PUFFSOP_SET(pops, psshfs, node, remove); 179 PUFFSOP_SET(pops, psshfs, node, readlink); 180 PUFFSOP_SET(pops, psshfs, node, rmdir); 181 PUFFSOP_SET(pops, psshfs, node, symlink); 182 PUFFSOP_SET(pops, psshfs, node, rename); 183 PUFFSOP_SET(pops, psshfs, node, read); 184 PUFFSOP_SET(pops, psshfs, node, write); 185 PUFFSOP_SET(pops, psshfs, node, reclaim); 186 187 memset(&pctx, 0, sizeof(pctx)); 188 pctx.mounttime = time(NULL); 189 190 userhost = argv[0]; 191 hostpath = strchr(userhost, ':'); 192 if (hostpath) { 193 *hostpath++ = '\0'; 194 pctx.mountpath = hostpath; 195 } else 196 pctx.mountpath = "."; 197 198 add_ssharg(&sshargs, &nargs, argv[0]); 199 add_ssharg(&sshargs, &nargs, "sftp"); 200 201 pu = puffs_init(pops, "ppshfs", &pctx, pflags); 202 if (pu == NULL) 203 err(1, "puffs_init"); 204 205 pssh_connect(&pctx, sshargs); 206 207 if (puffs_setblockingmode(pu, PUFFSDEV_NONBLOCK) == -1) 208 err(1, "setblockingmode"); 209 if (exportfs) 210 puffs_setfhsize(pu, sizeof(struct psshfs_fid), 211 PUFFS_FHFLAG_NFSV2 | PUFFS_FHFLAG_NFSV3); 212 213 if (puffs_domount(pu, argv[1], mntflags) == -1) 214 err(1, "puffs_domount"); 215 216 if (psshfs_domount(pu) != 0) 217 errx(1, "psshfs_domount"); 218 219 x = 1; 220 if (ioctl(pctx.sshfd, FIONBIO, &x) == -1) 221 err(1, "nonblocking descriptor"); 222 223 if (detach) 224 daemon(1, 0); 225 226 return puffs_framebuf_eventloop(pu, pctx.sshfd, 227 psbuf_read, psbuf_write, psbuf_cmp, NULL); 228 } 229 230 static void 231 pssh_connect(struct psshfs_ctx *pctx, char **sshargs) 232 { 233 int fds[2]; 234 pid_t pid; 235 236 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) 237 err(1, "socketpair"); 238 239 pid = fork(); 240 switch (pid) { 241 case -1: 242 err(1, "fork"); 243 /*NOTREACHED*/ 244 case 0: /* child */ 245 if (dup2(fds[0], STDIN_FILENO) == -1) 246 err(1, "child dup2"); 247 if (dup2(fds[0], STDOUT_FILENO) == -1) 248 err(1, "child dup2"); 249 close(fds[0]); 250 close(fds[1]); 251 execvp(sshargs[0], sshargs); 252 break; 253 default: 254 pctx->sshpid = pid; 255 pctx->sshfd = fds[1]; 256 close(fds[0]); 257 break; 258 } 259 } 260
Indexes created Tue Oct 21 12:09:54 GMT 2025