1/* $NetBSD: fs.c,v 1.8 2008/08/24 18:26:05 pooka 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#include <sys/cdefs.h> 29#ifndef lint 30__RCSID("$NetBSD: fs.c,v 1.8 2008/08/24 18:26:05 pooka Exp $"); 31#endif /* !lint */ 32 33#include <assert.h> 34#include <err.h> 35#include <errno.h> 36#include <puffs.h> 37#include <signal.h> 38#include <stdio.h> 39#include <stdlib.h> 40#include <unistd.h> 41 42#include "ninepuffs.h" 43#include "nineproto.h" 44 45#define DO_IO(fname, a1, a2, a3, a4, rv) \ 46 puffs_framebuf_seekset(a2, 0); \ 47 *(a4) = 0; \ 48 rv = fname(a1, a2, a3, a4); \ 49 if (rv) errx(1, "p9p_handshake io failed %d, %d", rv, *a4) 50 51struct puffs_node * 52p9p_handshake(struct puffs_usermount *pu, 53 const char *username, const char *path) 54{ 55 struct puffs9p *p9p = puffs_getspecific(pu); 56 struct puffs_framebuf *pb; 57 struct puffs_node *pn; 58 struct vattr rootva; 59 uint32_t maxreq; 60 uint16_t dummy; 61 p9ptag_t tagid, rtagid; 62 p9pfid_t curfid; 63 const char *p; 64 uint8_t type; 65 int rv, done, x = 1, ncomp; 66 67 /* send initial handshake */ 68 pb = p9pbuf_makeout(); 69 p9pbuf_put_1(pb, P9PROTO_T_VERSION); 70 p9pbuf_put_2(pb, P9PROTO_NOTAG); 71 p9pbuf_put_4(pb, p9p->maxreq); 72 p9pbuf_put_str(pb, P9PROTO_VERSION); 73 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 74 75 puffs_framebuf_recycle(pb); 76 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 77 78 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_VERSION) 79 errx(1, "server invalid response to Tversion: %d", type); 80 if ((rtagid = p9pbuf_get_tag(pb)) != P9PROTO_NOTAG) { 81 errx(1, "server invalid tag: %d vs. %d", 82 P9PROTO_NOTAG, rtagid); 83 return NULL; 84 } 85 if (p9pbuf_get_4(pb, &maxreq)) 86 errx(1, "server invalid response: no request length"); 87 if (maxreq < P9P_MINREQLEN) 88 errx(1, "server request length below minimum accepted: " 89 "%d vs. %d", P9P_MINREQLEN, maxreq); 90 p9p->maxreq = maxreq; 91 92 /* tell the server we don't support authentication */ 93 p9pbuf_recycleout(pb); 94 tagid = NEXTTAG(p9p); 95 p9pbuf_put_1(pb, P9PROTO_T_AUTH); 96 p9pbuf_put_2(pb, tagid); 97 p9pbuf_put_4(pb, P9PROTO_NOFID); 98 p9pbuf_put_str(pb, username); 99 p9pbuf_put_str(pb, ""); 100 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 101 102 puffs_framebuf_recycle(pb); 103 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 104 105 /* assume all Rerror is "no auth" */ 106 if (p9pbuf_get_type(pb) != P9PROTO_R_ERROR) 107 errx(1, "mount_9p supports only NO auth"); 108 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 109 errx(1, "server invalid tag: %d vs. %d", tagid, rtagid); 110 111 /* build attach message */ 112 p9pbuf_recycleout(pb); 113 tagid = NEXTTAG(p9p); 114 p9pbuf_put_1(pb, P9PROTO_T_ATTACH); 115 p9pbuf_put_2(pb, tagid); 116 p9pbuf_put_4(pb, P9P_ROOTFID); 117 p9pbuf_put_4(pb, P9PROTO_NOFID); 118 p9pbuf_put_str(pb, username); 119 p9pbuf_put_str(pb, ""); 120 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 121 122 puffs_framebuf_recycle(pb); 123 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 124 125 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_ATTACH) 126 errx(1, "Rattach not received, got %d", type); 127 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 128 errx(1, "server invalid tag: %d vs. %d", tagid, rtagid); 129 130 /* just walk away rootfid, you won't see me follow you back home */ 131 132#define EATSLASH(p) while (*(p) == '/') p++ 133 assert(*path == '/'); 134 p = path; 135 EATSLASH(p); 136 for (ncomp = 0; p && *p; ncomp++) { 137 EATSLASH(p); 138 if (!*p) 139 break; 140 p = strchr(p, '/'); 141 } 142 143 if (ncomp == 0) { 144 curfid = P9P_ROOTFID; 145 } else { 146 uint16_t walked; 147 148 p9pbuf_recycleout(pb); 149 tagid = NEXTTAG(p9p); 150 curfid = NEXTFID(p9p); 151 p9pbuf_put_1(pb, P9PROTO_T_WALK); 152 p9pbuf_put_2(pb, tagid); 153 p9pbuf_put_4(pb, P9P_ROOTFID); 154 p9pbuf_put_4(pb, curfid); 155 p9pbuf_put_2(pb, ncomp); 156 157 p = path; 158 while (p && *p) { 159 char *p2; 160 161 EATSLASH(p); 162 if (!*p) 163 break; 164 if ((p2 = strchr(p, '/')) == NULL) 165 p2 = strchr(p, '\0'); 166 p9pbuf_put_data(pb, p, p2-p); 167 p = p2; 168 } 169 170 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 171 172 puffs_framebuf_recycle(pb); 173 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 174 175 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_WALK) 176 errx(1, "Rwalk not received for rnode, got %d", type); 177 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 178 errx(1, "server invalid tag: %d vs. %d", 179 tagid, rtagid); 180 if (p9pbuf_get_2(pb, &walked) == -1) 181 errx(1, "can't get number of walked qids"); 182 if (walked != ncomp) 183 errx(1, "can't locate rootpath %s, only %d/%d " 184 "components found", path, walked, ncomp); 185 186 /* curfid is alive, clunk P9P_ROOTFID */ 187 p9pbuf_recycleout(pb); 188 tagid = NEXTTAG(p9p); 189 p9pbuf_put_1(pb, P9PROTO_T_CLUNK); 190 p9pbuf_put_2(pb, tagid); 191 p9pbuf_put_4(pb, P9P_ROOTFID); 192 193 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 194 puffs_framebuf_recycle(pb); 195 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 196 /* wedontcare */ 197 } 198 199 /* finally, stat the node */ 200 p9pbuf_recycleout(pb); 201 tagid = NEXTTAG(p9p); 202 p9pbuf_put_1(pb, P9PROTO_T_STAT); 203 p9pbuf_put_2(pb, tagid); 204 p9pbuf_put_4(pb, curfid); 205 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 206 207 puffs_framebuf_recycle(pb); 208 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 209 210 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_STAT) 211 errx(1, "Rstat not received, got %d", type); 212 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 213 errx(1, "server invalid tag: %d vs. %d", tagid, rtagid); 214 if (p9pbuf_get_2(pb, &dummy)) 215 errx(1, "couldn't get stat len parameter"); 216 if (proto_getstat(pb, &rootva, NULL, NULL)) 217 errx(1, "could not parse root attributes"); 218 puffs_framebuf_destroy(pb); 219 220 rootva.va_nlink = 0156; /* guess, will be fixed with first readdir */ 221 pn = newp9pnode_va(pu, &rootva, curfid); 222 223 if (ioctl(p9p->servsock, FIONBIO, &x) == -1) 224 err(1, "cannot set socket in nonblocking mode"); 225 226 return pn; 227} 228 229int 230puffs9p_fs_unmount(struct puffs_usermount *pu, int flags) 231{ 232 struct puffs9p *p9p = puffs_getspecific(pu); 233 234 close(p9p->servsock); 235 return 0; 236} 237