1 /* 2 * by Manuel Bouyer (bouyer@ensta.fr) 3 * 4 * There is no copyright, you can use it as you want. 5 */ 6 7 #include <sys/cdefs.h> 8 __FBSDID("$FreeBSD$"); 9 10 #include <sys/param.h> 11 #include <sys/mount.h> 12 #include <sys/file.h> 13 #include <sys/stat.h> 14 #include <sys/socket.h> 15 16 #include <ufs/ufs/quota.h> 17 #include <rpc/rpc.h> 18 #include <rpcsvc/rquota.h> 19 #include <arpa/inet.h> 20 #include <netdb.h> 21 22 #include <ctype.h> 23 #include <errno.h> 24 #include <fstab.h> 25 #include <grp.h> 26 #include <pwd.h> 27 #include <signal.h> 28 #include <stdio.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <syslog.h> 32 #include <unistd.h> 33 34 void rquota_service(struct svc_req *request, SVCXPRT *transp); 35 void sendquota(struct svc_req *request, SVCXPRT *transp); 36 void printerr_reply(SVCXPRT *transp); 37 void initfs(void); 38 int getfsquota(long id, char *path, struct dqblk *dqblk); 39 int hasquota(struct fstab *fs, char **qfnamep); 40 41 /* 42 * structure containing informations about ufs filesystems 43 * initialised by initfs() 44 */ 45 struct fs_stat { 46 struct fs_stat *fs_next; /* next element */ 47 char *fs_file; /* mount point of the filesystem */ 48 char *qfpathname; /* pathname of the quota file */ 49 dev_t st_dev; /* device of the filesystem */ 50 } fs_stat; 51 struct fs_stat *fs_begin = NULL; 52 53 int from_inetd = 1; 54 55 static void 56 cleanup(int sig) 57 { 58 59 (void) sig; 60 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL); 61 exit(0); 62 } 63 64 int 65 main(void) 66 { 67 SVCXPRT *transp; 68 int ok; 69 struct sockaddr_storage from; 70 socklen_t fromlen; 71 72 fromlen = sizeof(from); 73 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) { 74 from_inetd = 0; 75 } 76 77 if (!from_inetd) { 78 daemon(0, 0); 79 80 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL); 81 82 (void) signal(SIGINT, cleanup); 83 (void) signal(SIGTERM, cleanup); 84 (void) signal(SIGHUP, cleanup); 85 } 86 87 openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON); 88 89 /* create and register the service */ 90 if (from_inetd) { 91 transp = svc_tli_create(0, NULL, NULL, 0, 0); 92 if (transp == NULL) { 93 syslog(LOG_ERR, "couldn't create udp service."); 94 exit(1); 95 } 96 ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS, 97 rquota_service, NULL); 98 } else 99 ok = svc_create(rquota_service, 100 RQUOTAPROG, RQUOTAVERS, "udp"); 101 if (!ok) { 102 syslog(LOG_ERR, 103 "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", 104 from_inetd ? "(inetd)" : "udp"); 105 exit(1); 106 } 107 108 initfs(); 109 svc_run(); 110 syslog(LOG_ERR, "svc_run returned"); 111 exit(1); 112 } 113 114 void 115 rquota_service(struct svc_req *request, SVCXPRT *transp) 116 { 117 118 switch (request->rq_proc) { 119 case NULLPROC: 120 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL); 121 break; 122 123 case RQUOTAPROC_GETQUOTA: 124 case RQUOTAPROC_GETACTIVEQUOTA: 125 sendquota(request, transp); 126 break; 127 128 default: 129 svcerr_noproc(transp); 130 break; 131 } 132 if (from_inetd) 133 exit(0); 134 } 135 136 /* read quota for the specified id, and send it */ 137 void 138 sendquota(struct svc_req *request, SVCXPRT *transp) 139 { 140 struct getquota_args getq_args; 141 struct getquota_rslt getq_rslt; 142 struct dqblk dqblk; 143 struct timeval timev; 144 145 bzero((char *)&getq_args, sizeof(getq_args)); 146 if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) { 147 svcerr_decode(transp); 148 return; 149 } 150 if (request->rq_cred.oa_flavor != AUTH_UNIX) { 151 /* bad auth */ 152 getq_rslt.status = Q_EPERM; 153 } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) { 154 /* failed, return noquota */ 155 getq_rslt.status = Q_NOQUOTA; 156 } else { 157 gettimeofday(&timev, NULL); 158 getq_rslt.status = Q_OK; 159 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE; 160 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE; 161 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit = 162 dqblk.dqb_bhardlimit; 163 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit = 164 dqblk.dqb_bsoftlimit; 165 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks = 166 dqblk.dqb_curblocks; 167 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit = 168 dqblk.dqb_ihardlimit; 169 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit = 170 dqblk.dqb_isoftlimit; 171 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles = 172 dqblk.dqb_curinodes; 173 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft = 174 dqblk.dqb_btime - timev.tv_sec; 175 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft = 176 dqblk.dqb_itime - timev.tv_sec; 177 } 178 if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, &getq_rslt)) { 179 svcerr_systemerr(transp); 180 } 181 if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) { 182 syslog(LOG_ERR, "unable to free arguments"); 183 exit(1); 184 } 185 } 186 187 void 188 printerr_reply(SVCXPRT *transp) /* when a reply to a request failed */ 189 { 190 char name[INET6_ADDRSTRLEN]; 191 struct sockaddr *caller; 192 int save_errno; 193 194 save_errno = errno; 195 196 caller = (struct sockaddr *)svc_getrpccaller(transp)->buf; 197 getnameinfo(caller, caller->sa_len, name, sizeof (name), 198 NULL, 0, NI_NUMERICHOST); 199 errno = save_errno; 200 if (errno == 0) 201 syslog(LOG_ERR, "couldn't send reply to %s", name); 202 else 203 syslog(LOG_ERR, "couldn't send reply to %s: %m", name); 204 } 205 206 /* initialise the fs_tab list from entries in /etc/fstab */ 207 void 208 initfs(void) 209 { 210 struct fs_stat *fs_current = NULL; 211 struct fs_stat *fs_next = NULL; 212 char *qfpathname; 213 struct fstab *fs; 214 struct stat st; 215 216 setfsent(); 217 while ((fs = getfsent())) { 218 if (strcmp(fs->fs_vfstype, "ufs")) 219 continue; 220 if (!hasquota(fs, &qfpathname)) 221 continue; 222 223 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat)); 224 fs_current->fs_next = fs_next; /* next element */ 225 226 fs_current->fs_file = 227 malloc(sizeof(char) * (strlen(fs->fs_file) + 1)); 228 strcpy(fs_current->fs_file, fs->fs_file); 229 230 fs_current->qfpathname = 231 malloc(sizeof(char) * (strlen(qfpathname) + 1)); 232 strcpy(fs_current->qfpathname, qfpathname); 233 234 stat(fs_current->fs_file, &st); 235 fs_current->st_dev = st.st_dev; 236 237 fs_next = fs_current; 238 } 239 endfsent(); 240 fs_begin = fs_current; 241 } 242 243 /* 244 * gets the quotas for id, filesystem path. 245 * Return 0 if fail, 1 otherwise 246 */ 247 int 248 getfsquota(long id, char *path, struct dqblk *dqblk) 249 { 250 struct stat st_path; 251 struct fs_stat *fs; 252 int qcmd, fd, ret = 0; 253 254 if (stat(path, &st_path) < 0) 255 return (0); 256 257 qcmd = QCMD(Q_GETQUOTA, USRQUOTA); 258 259 for (fs = fs_begin; fs != NULL; fs = fs->fs_next) { 260 /* where the devise is the same as path */ 261 if (fs->st_dev != st_path.st_dev) 262 continue; 263 264 /* find the specified filesystem. get and return quota */ 265 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0) 266 return (1); 267 268 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) { 269 syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname); 270 return (0); 271 } 272 if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) { 273 close(fd); 274 return (1); 275 } 276 switch (read(fd, dqblk, sizeof(struct dqblk))) { 277 case 0: 278 /* 279 * Convert implicit 0 quota (EOF) 280 * into an explicit one (zero'ed dqblk) 281 */ 282 bzero(dqblk, sizeof(struct dqblk)); 283 ret = 1; 284 break; 285 case sizeof(struct dqblk): /* OK */ 286 ret = 1; 287 break; 288 default: /* ERROR */ 289 syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname); 290 close(fd); 291 return (0); 292 } 293 close(fd); 294 } 295 return (ret); 296 } 297 298 /* 299 * Check to see if a particular quota is to be enabled. 300 * Comes from quota.c, NetBSD 0.9 301 */ 302 int 303 hasquota(struct fstab *fs, char **qfnamep) 304 { 305 static char initname, usrname[100]; 306 static char buf[BUFSIZ]; 307 char *opt, *cp; 308 const char *qfextension[] = INITQFNAMES; 309 310 if (!initname) { 311 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME); 312 initname = 1; 313 } 314 strcpy(buf, fs->fs_mntops); 315 for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) { 316 if ((cp = index(opt, '='))) 317 *cp++ = '\0'; 318 if (strcmp(opt, usrname) == 0) 319 break; 320 } 321 if (!opt) 322 return (0); 323 if (cp) { 324 *qfnamep = cp; 325 return (1); 326 } 327 sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, 328 qfextension[USRQUOTA]); 329 *qfnamep = buf; 330 return (1); 331 } 332