1 /* $NetBSD: fs.c,v 1.11 2020/05/28 14:00:05 uwe 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 1.11 2020/05/28 14:00:05 uwe 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 /* build attach message */ 113 p9pbuf_recycleout(pb); 114 tagid = NEXTTAG(p9p); 115 p9pbuf_put_1(pb, P9PROTO_T_ATTACH); 116 p9pbuf_put_2(pb, tagid); 117 p9pbuf_put_4(pb, P9P_ROOTFID); 118 p9pbuf_put_4(pb, P9PROTO_NOFID); 119 p9pbuf_put_str(pb, username); 120 p9pbuf_put_str(pb, ""); 121 if (p9p->protover == P9PROTO_VERSION_U) 122 p9pbuf_put_4(pb, P9PROTO_NUNAME_UNSPECIFIED); /* n_uname[4] */ 123 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 124 125 puffs_framebuf_recycle(pb); 126 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 127 128 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_ATTACH) 129 errx(1, "Rattach not received, got %d", type); 130 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 131 errx(1, "server invalid tag: %d vs. %d", tagid, rtagid); 132 133 /* just walk away rootfid, you won't see me follow you back home */ 134 135 #define EATSLASH(p) while (*(p) == '/') p++ 136 assert(*path == '/'); 137 p = path; 138 EATSLASH(p); 139 for (ncomp = 0; p && *p; ncomp++) { 140 EATSLASH(p); 141 if (!*p) 142 break; 143 p = strchr(p, '/'); 144 } 145 146 if (ncomp == 0) { 147 curfid = P9P_ROOTFID; 148 } else { 149 uint16_t walked; 150 151 p9pbuf_recycleout(pb); 152 tagid = NEXTTAG(p9p); 153 curfid = NEXTFID(p9p); 154 p9pbuf_put_1(pb, P9PROTO_T_WALK); 155 p9pbuf_put_2(pb, tagid); 156 p9pbuf_put_4(pb, P9P_ROOTFID); 157 p9pbuf_put_4(pb, curfid); 158 p9pbuf_put_2(pb, ncomp); 159 160 p = path; 161 while (p && *p) { 162 char *p2; 163 164 EATSLASH(p); 165 if (!*p) 166 break; 167 if ((p2 = strchr(p, '/')) == NULL) 168 p2 = strchr(p, '\0'); 169 p9pbuf_put_data(pb, p, p2-p); 170 p = p2; 171 } 172 173 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 174 175 puffs_framebuf_recycle(pb); 176 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 177 178 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_WALK) 179 errx(1, "Rwalk not received for rnode, got %d", type); 180 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 181 errx(1, "server invalid tag: %d vs. %d", 182 tagid, rtagid); 183 if (p9pbuf_get_2(pb, &walked) == -1) 184 errx(1, "can't get number of walked qids"); 185 if (walked != ncomp) 186 errx(1, "can't locate rootpath %s, only %d/%d " 187 "components found", path, walked, ncomp); 188 189 /* curfid is alive, clunk P9P_ROOTFID */ 190 p9pbuf_recycleout(pb); 191 tagid = NEXTTAG(p9p); 192 p9pbuf_put_1(pb, P9PROTO_T_CLUNK); 193 p9pbuf_put_2(pb, tagid); 194 p9pbuf_put_4(pb, P9P_ROOTFID); 195 196 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 197 puffs_framebuf_recycle(pb); 198 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 199 /* wedontcare */ 200 } 201 202 /* finally, stat the node */ 203 p9pbuf_recycleout(pb); 204 tagid = NEXTTAG(p9p); 205 p9pbuf_put_1(pb, P9PROTO_T_STAT); 206 p9pbuf_put_2(pb, tagid); 207 p9pbuf_put_4(pb, curfid); 208 DO_IO(p9pbuf_write, pu, pb, p9p->servsock, &done, rv); 209 210 puffs_framebuf_recycle(pb); 211 DO_IO(p9pbuf_read, pu, pb, p9p->servsock, &done, rv); 212 213 if ((type = p9pbuf_get_type(pb)) != P9PROTO_R_STAT) 214 errx(1, "Rstat not received, got %d", type); 215 if ((rtagid = p9pbuf_get_tag(pb)) != tagid) 216 errx(1, "server invalid tag: %d vs. %d", tagid, rtagid); 217 if (p9pbuf_get_2(pb, &dummy)) 218 errx(1, "couldn't get stat len parameter"); 219 if (proto_getstat(pu, pb, &rootva, NULL, NULL)) 220 errx(1, "could not parse root attributes"); 221 puffs_framebuf_destroy(pb); 222 223 rootva.va_nlink = 0156; /* guess, will be fixed with first readdir */ 224 pn = newp9pnode_va(pu, &rootva, curfid); 225 226 if (ioctl(p9p->servsock, FIONBIO, &x) == -1) 227 err(1, "cannot set socket in nonblocking mode"); 228 229 return pn; 230 } 231 232 int 233 puffs9p_fs_unmount(struct puffs_usermount *pu, int flags) 234 { 235 struct puffs9p *p9p = puffs_getspecific(pu); 236 237 close(p9p->servsock); 238 return 0; 239 } 240
Indexes created Tue Sep 23 02:09:52 GMT 2025