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 static void rquota_service(struct svc_req *request, SVCXPRT *transp); 35 static void sendquota(struct svc_req *request, SVCXPRT *transp); 36 static void initfs(void); 37 static int getfsquota(long id, char *path, struct dqblk *dqblk); 38 static int hasquota(struct fstab *fs, char **qfnamep); 39 40 /* 41 * structure containing informations about ufs filesystems 42 * initialised by initfs() 43 */ 44 struct fs_stat { 45 struct fs_stat *fs_next; /* next element */ 46 char *fs_file; /* mount point of the filesystem */ 47 char *qfpathname; /* pathname of the quota file */ 48 dev_t st_dev; /* device of the filesystem */ 49 } fs_stat; 50 static struct fs_stat *fs_begin = NULL; 51 52 static int from_inetd = 1; 53 54 static void 55 cleanup(int sig) 56 { 57 58 (void)sig; 59 (void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL); 60 exit(0); 61 } 62 63 int 64 main(void) 65 { 66 SVCXPRT *transp; 67 int ok; 68 struct sockaddr_storage from; 69 socklen_t fromlen; 70 71 fromlen = sizeof(from); 72 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) 73 from_inetd = 0; 74 75 if (!from_inetd) { 76 daemon(0, 0); 77 78 (void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL); 79 80 (void)signal(SIGINT, cleanup); 81 (void)signal(SIGTERM, cleanup); 82 (void)signal(SIGHUP, cleanup); 83 } 84 85 openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON); 86 87 /* create and register the service */ 88 if (from_inetd) { 89 transp = svc_tli_create(0, NULL, NULL, 0, 0); 90 if (transp == NULL) { 91 syslog(LOG_ERR, "couldn't create udp service."); 92 exit(1); 93 } 94 ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS, 95 rquota_service, NULL); 96 } else { 97 ok = svc_create(rquota_service, 98 RQUOTAPROG, RQUOTAVERS, "udp"); 99 } 100 if (!ok) { 101 syslog(LOG_ERR, 102 "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", 103 from_inetd ? "(inetd)" : "udp"); 104 exit(1); 105 } 106 107 initfs(); 108 svc_run(); 109 syslog(LOG_ERR, "svc_run returned"); 110 exit(1); 111 } 112 113 static void 114 rquota_service(struct svc_req *request, SVCXPRT *transp) 115 { 116 117 switch (request->rq_proc) { 118 case NULLPROC: 119 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL); 120 break; 121 122 case RQUOTAPROC_GETQUOTA: 123 case RQUOTAPROC_GETACTIVEQUOTA: 124 sendquota(request, transp); 125 break; 126 127 default: 128 svcerr_noproc(transp); 129 break; 130 } 131 if (from_inetd) 132 exit(0); 133 } 134 135 /* read quota for the specified id, and send it */ 136 static void 137 sendquota(struct svc_req *request, SVCXPRT *transp) 138 { 139 struct getquota_args getq_args; 140 struct getquota_rslt getq_rslt; 141 struct dqblk dqblk; 142 struct timeval timev; 143 144 bzero(&getq_args, sizeof(getq_args)); 145 if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) { 146 svcerr_decode(transp); 147 return; 148 } 149 if (request->rq_cred.oa_flavor != AUTH_UNIX) { 150 /* bad auth */ 151 getq_rslt.status = Q_EPERM; 152 } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) { 153 /* failed, return noquota */ 154 getq_rslt.status = Q_NOQUOTA; 155 } else { 156 gettimeofday(&timev, NULL); 157 getq_rslt.status = Q_OK; 158 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE; 159 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE; 160 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit = 161 dqblk.dqb_bhardlimit; 162 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit = 163 dqblk.dqb_bsoftlimit; 164 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks = 165 dqblk.dqb_curblocks; 166 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit = 167 dqblk.dqb_ihardlimit; 168 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit = 169 dqblk.dqb_isoftlimit; 170 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles = 171 dqblk.dqb_curinodes; 172 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft = 173 dqblk.dqb_btime - timev.tv_sec; 174 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft = 175 dqblk.dqb_itime - timev.tv_sec; 176 } 177 if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, &getq_rslt)) 178 svcerr_systemerr(transp); 179 if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) { 180 syslog(LOG_ERR, "unable to free arguments"); 181 exit(1); 182 } 183 } 184 185 /* initialise the fs_tab list from entries in /etc/fstab */ 186 static void 187 initfs(void) 188 { 189 struct fs_stat *fs_current = NULL; 190 struct fs_stat *fs_next = NULL; 191 char *qfpathname; 192 struct fstab *fs; 193 struct stat st; 194 195 setfsent(); 196 while ((fs = getfsent())) { 197 if (strcmp(fs->fs_vfstype, "ufs")) 198 continue; 199 if (!hasquota(fs, &qfpathname)) 200 continue; 201 202 fs_current = malloc(sizeof(struct fs_stat)); 203 fs_current->fs_next = fs_next; /* next element */ 204 205 fs_current->fs_file = malloc(strlen(fs->fs_file) + 1); 206 strcpy(fs_current->fs_file, fs->fs_file); 207 208 fs_current->qfpathname = malloc(strlen(qfpathname) + 1); 209 strcpy(fs_current->qfpathname, qfpathname); 210 211 stat(fs_current->fs_file, &st); 212 fs_current->st_dev = st.st_dev; 213 214 fs_next = fs_current; 215 } 216 endfsent(); 217 fs_begin = fs_current; 218 } 219 220 /* 221 * gets the quotas for id, filesystem path. 222 * Return 0 if fail, 1 otherwise 223 */ 224 static int 225 getfsquota(long id, char *path, struct dqblk *dqblk) 226 { 227 struct stat st_path; 228 struct fs_stat *fs; 229 int qcmd, fd, ret = 0; 230 231 if (stat(path, &st_path) < 0) 232 return (0); 233 234 qcmd = QCMD(Q_GETQUOTA, USRQUOTA); 235 236 for (fs = fs_begin; fs != NULL; fs = fs->fs_next) { 237 /* where the device is the same as path */ 238 if (fs->st_dev != st_path.st_dev) 239 continue; 240 241 /* find the specified filesystem. get and return quota */ 242 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0) 243 return (1); 244 245 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) { 246 syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname); 247 return (0); 248 } 249 if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) { 250 close(fd); 251 return (1); 252 } 253 switch (read(fd, dqblk, sizeof(struct dqblk))) { 254 case 0: 255 /* 256 * Convert implicit 0 quota (EOF) 257 * into an explicit one (zero'ed dqblk) 258 */ 259 bzero(dqblk, sizeof(struct dqblk)); 260 ret = 1; 261 break; 262 case sizeof(struct dqblk): /* OK */ 263 ret = 1; 264 break; 265 default: /* ERROR */ 266 syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname); 267 close(fd); 268 return (0); 269 } 270 close(fd); 271 } 272 return (ret); 273 } 274 275 /* 276 * Check to see if a particular quota is to be enabled. 277 * Comes from quota.c, NetBSD 0.9 278 */ 279 static int 280 hasquota(struct fstab *fs, char **qfnamep) 281 { 282 static char initname, usrname[100]; 283 static char buf[BUFSIZ]; 284 char *opt, *cp; 285 const char *qfextension[] = INITQFNAMES; 286 287 if (!initname) { 288 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME); 289 initname = 1; 290 } 291 strcpy(buf, fs->fs_mntops); 292 for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) { 293 if ((cp = index(opt, '='))) 294 *cp++ = '\0'; 295 if (strcmp(opt, usrname) == 0) 296 break; 297 } 298 if (!opt) 299 return (0); 300 if (cp) { 301 *qfnamep = cp; 302 return (1); 303 } 304 sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, 305 qfextension[USRQUOTA]); 306 *qfnamep = buf; 307 return (1); 308 } 309