fs.c revision 1.9.42.1
1 /* $NetBSD: fs.c,v 1.9.42.1 2019/06/10 22:10:35 christos 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 1.9.42.1 2019/06/10 22:10:35 christos 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 51 static const char * 52 p9p_ver2str(int version) 53 { 54 55 switch (version) { 56 case P9PROTO_VERSION: return P9PROTO_VERSTR; 57 case P9PROTO_VERSION_U: return P9PROTO_VERSTR_U; 58 } 59 return NULL; 60 } 61 62 struct puffs_node * 63 p9p_handshake(struct puffs_usermount *pu, 64 const char *username, const char *path) 65 { 66 struct puffs9p *p9p = puffs_getspecific(pu); 67 struct puffs_framebuf *pb; 68 struct puffs_node *pn; 69 struct vattr rootva; 70 uint32_t maxreq; 71 uint16_t dummy; 72 p9ptag_t tagid, rtagid; 73 p9pfid_t curfid; 74 const char *p; 75 uint8_t type; 76 int rv, done, x = 1, ncomp; 77 uint16_t strsize; 78 char *str; 79 80 /* send initial handshake */ 81 pb = p9pbuf_makeout(); 82 p9pbuf_put_1(pb, P9PROTO_T_VERSION); 83 p9pbuf_put_2(pb, P9PROTO_NOTAG); 84 p9pbuf_put_4(pb, p9p->maxreq); 85 p9pbuf_put_str(pb, p9p_ver2str(p9p->protover)); 86 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 87 88 puffs_framebuf_recycle(pb); 89 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 90 91 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_VERSION) 92 errx(1, "server invalid response to Tversion: %d", type); 93 if ((rtagid = p9pbuf_get_tag(pb)) != P9PROTO_NOTAG) { 94 errx(1, "server invalid tag: %d vs. %d", 95 P9PROTO_NOTAG, rtagid); 96 return NULL; 97 } 98 if (p9pbuf_get_4(pb, &maxreq)) 99 errx(1, "server invalid response: no request length"); 100 if (maxreq < P9P_MINREQLEN) 101 errx(1, "server request length below minimum accepted: " 102 "%d vs. %d", P9P_MINREQLEN, maxreq); 103 p9p->maxreq = maxreq; 104 105 if (p9pbuf_get_str(pb, &str, &strsize)) 106 errx(1, "server invalid response: no version"); 107 if (strncmp(str, p9p_ver2str(p9p->protover), P9PROTO_VERSTR_MAXLEN) != 0) { 108 errx(1, "server doesn't support %s", p9p_ver2str(p9p->protover)); 109 /* Should downgrade from 9P2000.u to 9P2000 if the server request? */ 110 } 111 112 /* tell the server we don't support authentication */ 113 p9pbuf_recycleout(pb); 114 tagid = NEXTTAG(p9p); 115 p9pbuf_put_1(pb, P9PROTO_T_AUTH); 116 p9pbuf_put_2(pb, tagid); 117 p9pbuf_put_4(pb, P9PROTO_NOFID); 118 p9pbuf_put_str(pb, username); 119 p9pbuf_put_str(pb, ""); 120 if (p9p->protover == P9PROTO_VERSION_U) 121 p9pbuf_put_4(pb, P9PROTO_NUNAME_UNSPECIFIED); /* n_uname[4] */ 122 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 123 124 puffs_framebuf_recycle(pb); 125 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 126 127 /* assume all Rerror is "no auth" */ 128 if (p9pbuf_get_type(pb) != P9PROTO_R_ERROR) 129 errx(1, "mount_9p supports only NO auth"); 130 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 131 errx(1, "server invalid tag: %d vs. %d", tagid, rtagid); 132 133 /* build attach message */ 134 p9pbuf_recycleout(pb); 135 tagid = NEXTTAG(p9p); 136 p9pbuf_put_1(pb, P9PROTO_T_ATTACH); 137 p9pbuf_put_2(pb, tagid); 138 p9pbuf_put_4(pb, P9P_ROOTFID); 139 p9pbuf_put_4(pb, P9PROTO_NOFID); 140 p9pbuf_put_str(pb, username); 141 p9pbuf_put_str(pb, ""); 142 if (p9p->protover == P9PROTO_VERSION_U) 143 p9pbuf_put_4(pb, P9PROTO_NUNAME_UNSPECIFIED); /* n_uname[4] */ 144 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 145 146 puffs_framebuf_recycle(pb); 147 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 148 149 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_ATTACH) 150 errx(1, "Rattach not received, got %d", type); 151 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 152 errx(1, "server invalid tag: %d vs. %d", tagid, rtagid); 153 154 /* just walk away rootfid, you won't see me follow you back home */ 155 156 #define EATSLASH(p) while (*(p) == '/') p++ 157 assert(*path == '/'); 158 p = path; 159 EATSLASH(p); 160 for (ncomp = 0; p && *p; ncomp++) { 161 EATSLASH(p); 162 if (!*p) 163 break; 164 p = strchr(p, '/'); 165 } 166 167 if (ncomp == 0) { 168 curfid = P9P_ROOTFID; 169 } else { 170 uint16_t walked; 171 172 p9pbuf_recycleout(pb); 173 tagid = NEXTTAG(p9p); 174 curfid = NEXTFID(p9p); 175 p9pbuf_put_1(pb, P9PROTO_T_WALK); 176 p9pbuf_put_2(pb, tagid); 177 p9pbuf_put_4(pb, P9P_ROOTFID); 178 p9pbuf_put_4(pb, curfid); 179 p9pbuf_put_2(pb, ncomp); 180 181 p = path; 182 while (p && *p) { 183 char *p2; 184 185 EATSLASH(p); 186 if (!*p) 187 break; 188 if ((p2 = strchr(p, '/')) == NULL) 189 p2 = strchr(p, '\0'); 190 p9pbuf_put_data(pb, p, p2-p); 191 p = p2; 192 } 193 194 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 195 196 puffs_framebuf_recycle(pb); 197 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 198 199 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_WALK) 200 errx(1, "Rwalk not received for rnode, got %d", type); 201 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 202 errx(1, "server invalid tag: %d vs. %d", 203 tagid, rtagid); 204 if (p9pbuf_get_2(pb, &walked) == -1) 205 errx(1, "can't get number of walked qids"); 206 if (walked != ncomp) 207 errx(1, "can't locate rootpath %s, only %d/%d " 208 "components found", path, walked, ncomp); 209 210 /* curfid is alive, clunk P9P_ROOTFID */ 211 p9pbuf_recycleout(pb); 212 tagid = NEXTTAG(p9p); 213 p9pbuf_put_1(pb, P9PROTO_T_CLUNK); 214 p9pbuf_put_2(pb, tagid); 215 p9pbuf_put_4(pb, P9P_ROOTFID); 216 217 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 218 puffs_framebuf_recycle(pb); 219 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 220 /* wedontcare */ 221 } 222 223 /* finally, stat the node */ 224 p9pbuf_recycleout(pb); 225 tagid = NEXTTAG(p9p); 226 p9pbuf_put_1(pb, P9PROTO_T_STAT); 227 p9pbuf_put_2(pb, tagid); 228 p9pbuf_put_4(pb, curfid); 229 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 230 231 puffs_framebuf_recycle(pb); 232 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 233 234 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_STAT) 235 errx(1, "Rstat not received, got %d", type); 236 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 237 errx(1, "server invalid tag: %d vs. %d", tagid, rtagid); 238 if (p9pbuf_get_2(pb, &dummy)) 239 errx(1, "couldn't get stat len parameter"); 240 if (proto_getstat(pu, pb, &rootva, NULL, NULL)) 241 errx(1, "could not parse root attributes"); 242 puffs_framebuf_destroy(pb); 243 244 rootva.va_nlink = 0156; /* guess, will be fixed with first readdir */ 245 pn = newp9pnode_va(pu, &rootva, curfid); 246 247 if (ioctl(p9p->servsock, FIONBIO, &x) == -1) 248 err(1, "cannot set socket in nonblocking mode"); 249 250 return pn; 251 } 252 253 int 254 puffs9p_fs_unmount(struct puffs_usermount *pu, int flags) 255 { 256 struct puffs9p *p9p = puffs_getspecific(pu); 257 258 close(p9p->servsock); 259 return 0; 260 } 261
Indexes created Wed Oct 22 13:09:56 GMT 2025