psshfs.c revision 1.29
1 /* $NetBSD: psshfs.c,v 1.29 2007/06/06 01:55:03 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 1.29 2007/06/06 01:55:03 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 usage(void); 65 static void add_ssharg(char ***, int *, char *); 66 67 #define SSH_PATH "/usr/bin/ssh" 68 69 static void 70 add_ssharg(char ***sshargs, int *nargs, char *arg) 71 { 72 73 *sshargs = realloc(*sshargs, (*nargs + 2) * sizeof(char*)); 74 if (!*sshargs) 75 err(1, "realloc"); 76 (*sshargs)[(*nargs)++] = arg; 77 (*sshargs)[*nargs] = NULL; 78 } 79 80 static void 81 usage() 82 { 83 84 fprintf(stderr, "usage: %s " 85 "[-es] [-O sshopt=value] [-o opts] user@host:path mountpath\n", 86 getprogname()); 87 exit(1); 88 } 89 90 int 91 main(int argc, char *argv[]) 92 { 93 struct psshfs_ctx pctx; 94 struct puffs_usermount *pu; 95 struct puffs_ops *pops; 96 mntoptparse_t mp; 97 char **sshargs; 98 char *userhost; 99 char *hostpath; 100 int mntflags, pflags, lflags, ch; 101 int exportfs; 102 int nargs, x; 103 104 setprogname(argv[0]); 105 106 if (argc < 3) 107 usage(); 108 109 mntflags = pflags = lflags = exportfs = nargs = 0; 110 sshargs = NULL; 111 add_ssharg(&sshargs, &nargs, SSH_PATH); 112 add_ssharg(&sshargs, &nargs, "-axs"); 113 add_ssharg(&sshargs, &nargs, "-oClearAllForwardings=yes"); 114 115 while ((ch = getopt(argc, argv, "eo:O:s")) != -1) { 116 switch (ch) { 117 case 'e': 118 exportfs = 1; 119 break; 120 case 'O': 121 add_ssharg(&sshargs, &nargs, "-o"); 122 add_ssharg(&sshargs, &nargs, optarg); 123 break; 124 case 'o': 125 mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags); 126 if (mp == NULL) 127 err(1, "getmntopts"); 128 freemntopts(mp); 129 break; 130 case 's': 131 lflags |= PUFFSLOOP_NODAEMON; 132 break; 133 default: 134 usage(); 135 /*NOTREACHED*/ 136 } 137 } 138 argc -= optind; 139 argv += optind; 140 141 #if 0 142 /* XXX: noatime is mandatory for now */ 143 mntflags |= MNT_NOATIME; 144 #endif 145 146 if (pflags & PUFFS_FLAG_OPDUMP) 147 lflags |= PUFFSLOOP_NODAEMON; 148 pflags |= PUFFS_FLAG_BUILDPATH; 149 pflags |= PUFFS_KFLAG_WTCACHE | PUFFS_KFLAG_IAONDEMAND; 150 151 if (argc != 2) 152 usage(); 153 154 PUFFSOP_INIT(pops); 155 156 PUFFSOP_SET(pops, psshfs, fs, unmount); 157 PUFFSOP_SETFSNOP(pops, sync); /* XXX */ 158 PUFFSOP_SETFSNOP(pops, statvfs); 159 PUFFSOP_SET(pops, psshfs, fs, nodetofh); 160 PUFFSOP_SET(pops, psshfs, fs, fhtonode); 161 162 PUFFSOP_SET(pops, psshfs, node, lookup); 163 PUFFSOP_SET(pops, psshfs, node, create); 164 PUFFSOP_SET(pops, psshfs, node, open); 165 PUFFSOP_SET(pops, psshfs, node, inactive); 166 PUFFSOP_SET(pops, psshfs, node, readdir); 167 PUFFSOP_SET(pops, psshfs, node, getattr); 168 PUFFSOP_SET(pops, psshfs, node, setattr); 169 PUFFSOP_SET(pops, psshfs, node, mkdir); 170 PUFFSOP_SET(pops, psshfs, node, remove); 171 PUFFSOP_SET(pops, psshfs, node, readlink); 172 PUFFSOP_SET(pops, psshfs, node, rmdir); 173 PUFFSOP_SET(pops, psshfs, node, symlink); 174 PUFFSOP_SET(pops, psshfs, node, rename); 175 PUFFSOP_SET(pops, psshfs, node, read); 176 PUFFSOP_SET(pops, psshfs, node, write); 177 PUFFSOP_SET(pops, psshfs, node, reclaim); 178 179 memset(&pctx, 0, sizeof(pctx)); 180 pctx.mounttime = time(NULL); 181 182 userhost = argv[0]; 183 hostpath = strchr(userhost, ':'); 184 if (hostpath) { 185 *hostpath++ = '\0'; 186 pctx.mountpath = hostpath; 187 } else 188 pctx.mountpath = "."; 189 190 add_ssharg(&sshargs, &nargs, argv[0]); 191 add_ssharg(&sshargs, &nargs, "sftp"); 192 193 pu = puffs_init(pops, "ppshfs", &pctx, pflags); 194 if (pu == NULL) 195 err(1, "puffs_init"); 196 197 pssh_connect(&pctx, sshargs); 198 199 if (puffs_setblockingmode(pu, PUFFSDEV_NONBLOCK) == -1) 200 err(1, "setblockingmode"); 201 if (exportfs) 202 puffs_setfhsize(pu, sizeof(struct psshfs_fid), 203 PUFFS_FHFLAG_NFSV2 | PUFFS_FHFLAG_NFSV3); 204 205 if (psshfs_domount(pu) != 0) 206 errx(1, "psshfs_domount"); 207 x = 1; 208 if (ioctl(pctx.sshfd, FIONBIO, &x) == -1) 209 err(1, "nonblocking descriptor"); 210 211 puffs_framev_init(pu, psbuf_read, psbuf_write, psbuf_cmp, 212 puffs_framev_unmountonclose); 213 if (puffs_framev_addfd(pu, pctx.sshfd) == -1) 214 err(1, "framebuf addfd"); 215 216 if (puffs_mount(pu, argv[1], mntflags, puffs_getroot(pu)) == -1) 217 err(1, "puffs_mount"); 218 219 return puffs_mainloop(pu, lflags); 220 } 221 222 static void 223 pssh_connect(struct psshfs_ctx *pctx, char **sshargs) 224 { 225 int fds[2]; 226 pid_t pid; 227 int dnfd; 228 229 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) 230 err(1, "socketpair"); 231 232 pid = fork(); 233 switch (pid) { 234 case -1: 235 err(1, "fork"); 236 /*NOTREACHED*/ 237 case 0: /* child */ 238 if (dup2(fds[0], STDIN_FILENO) == -1) 239 err(1, "child dup2"); 240 if (dup2(fds[0], STDOUT_FILENO) == -1) 241 err(1, "child dup2"); 242 close(fds[0]); 243 close(fds[1]); 244 245 dnfd = open(_PATH_DEVNULL, O_RDWR); 246 if (dnfd != -1) 247 dup2(dnfd, STDERR_FILENO); 248 249 execvp(sshargs[0], sshargs); 250 break; 251 default: 252 pctx->sshpid = pid; 253 pctx->sshfd = fds[1]; 254 close(fds[0]); 255 break; 256 } 257 } 258
Indexes created Wed Oct 15 03:09:54 GMT 2025