1 #ifndef lint 2 static char sccsid[] = "@(#)rmjob.c 4.10 (Berkeley) 07/24/84"; 3 #endif 4 5 /* 6 * rmjob - remove the specified jobs from the queue. 7 */ 8 9 #include "lp.h" 10 11 /* 12 * Stuff for handling lprm specifications 13 */ 14 extern char *user[]; /* users to process */ 15 extern int users; /* # of users in user array */ 16 extern int requ[]; /* job number of spool entries */ 17 extern int requests; /* # of spool requests */ 18 extern char *person; /* name of person doing lprm */ 19 20 char root[] = "root"; 21 int all = 0; /* eliminate all files (root only) */ 22 int cur_daemon; /* daemon's pid */ 23 char current[40]; /* active control file name */ 24 25 int iscf(); 26 27 rmjob() 28 { 29 register int i, nitems; 30 int assasinated = 0; 31 struct direct **files; 32 33 if ((i = pgetent(line, printer)) < 0) 34 fatal("cannot open printer description file"); 35 else if (i == 0) 36 fatal("unknown printer"); 37 if ((SD = pgetstr("sd", &bp)) == NULL) 38 SD = DEFSPOOL; 39 if ((LO = pgetstr("lo", &bp)) == NULL) 40 LO = DEFLOCK; 41 if ((LP = pgetstr("lp", &bp)) == NULL) 42 LP = DEFDEVLP; 43 if ((RP = pgetstr("rp", &bp)) == NULL) 44 RP = DEFLP; 45 RM = pgetstr("rm", &bp); 46 47 /* 48 * If the format was `lprm -' and the user isn't the super-user, 49 * then fake things to look like he said `lprm user'. 50 */ 51 if (users < 0) { 52 if (getuid() == 0) 53 all = 1; /* all files in local queue */ 54 else { 55 user[0] = person; 56 users = 1; 57 } 58 } 59 if (!strcmp(person, "-all")) { 60 if (from == host) 61 fatal("The login name \"-all\" is reserved"); 62 all = 1; /* all those from 'from' */ 63 person = root; 64 } 65 66 if (chdir(SD) < 0) 67 fatal("cannot chdir to spool directory"); 68 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 69 fatal("cannot access spool directory"); 70 71 if (nitems) { 72 /* 73 * Check for an active printer daemon (in which case we 74 * kill it if it is reading our file) then remove stuff 75 * (after which we have to restart the daemon). 76 */ 77 if (lockchk(LO) && chk(current)) { 78 assasinated = kill(cur_daemon, SIGINT) == 0; 79 if (!assasinated) 80 fatal("cannot kill printer daemon"); 81 } 82 /* 83 * process the files 84 */ 85 for (i = 0; i < nitems; i++) 86 process(files[i]->d_name); 87 } 88 chkremote(); 89 /* 90 * Restart the printer daemon if it was killed 91 */ 92 if (assasinated && !startdaemon(printer)) 93 fatal("cannot restart printer daemon\n"); 94 exit(0); 95 } 96 97 /* 98 * Process a lock file: collect the pid of the active 99 * daemon and the file name of the active spool entry. 100 * Return boolean indicating existence of a lock file. 101 */ 102 lockchk(s) 103 char *s; 104 { 105 register FILE *fp; 106 register int i, n; 107 108 if ((fp = fopen(s, "r")) == NULL) 109 if (errno == EACCES) 110 fatal("can't access lock file"); 111 else 112 return(0); 113 if (!getline(fp)) { 114 (void) fclose(fp); 115 return(0); /* no daemon present */ 116 } 117 cur_daemon = atoi(line); 118 if (kill(cur_daemon, 0) < 0) { 119 (void) fclose(fp); 120 return(0); /* no daemon present */ 121 } 122 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 123 if (i > 5) { 124 n = 1; 125 break; 126 } 127 sleep(i); 128 } 129 current[n-1] = '\0'; 130 (void) fclose(fp); 131 return(1); 132 } 133 134 /* 135 * Process a control file. 136 */ 137 process(file) 138 char *file; 139 { 140 FILE *cfp; 141 142 if (!chk(file)) 143 return; 144 if ((cfp = fopen(file, "r")) == NULL) 145 fatal("cannot open %s", file); 146 while (getline(cfp)) { 147 switch (line[0]) { 148 case 'U': /* unlink associated files */ 149 if (from != host) 150 printf("%s: ", host); 151 printf(unlink(line+1) ? "cannot dequeue %s\n" : 152 "%s dequeued\n", line+1); 153 } 154 } 155 (void) fclose(cfp); 156 if (from != host) 157 printf("%s: ", host); 158 printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file); 159 } 160 161 /* 162 * Do the dirty work in checking 163 */ 164 chk(file) 165 char *file; 166 { 167 register int *r, n; 168 register char **u, *cp; 169 FILE *cfp; 170 171 /* 172 * Check for valid cf file name (mostly checking current). 173 */ 174 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f') 175 return(0); 176 177 if (all && (from == host || !strcmp(from, file+6))) 178 return(1); 179 180 /* 181 * get the owner's name from the control file. 182 */ 183 if ((cfp = fopen(file, "r")) == NULL) 184 return(0); 185 while (getline(cfp)) { 186 if (line[0] == 'P') 187 break; 188 } 189 (void) fclose(cfp); 190 if (line[0] != 'P') 191 return(0); 192 193 if (users == 0 && requests == 0) 194 return(!strcmp(file, current) && isowner(line+1, file)); 195 /* 196 * Check the request list 197 */ 198 for (n = 0, cp = file+3; isdigit(*cp); ) 199 n = n * 10 + (*cp++ - '0'); 200 for (r = requ; r < &requ[requests]; r++) 201 if (*r == n && isowner(line+1, file)) 202 return(1); 203 /* 204 * Check to see if it's in the user list 205 */ 206 for (u = user; u < &user[users]; u++) 207 if (!strcmp(*u, line+1) && isowner(line+1, file)) 208 return(1); 209 return(0); 210 } 211 212 /* 213 * If root is removing a file on the local machine, allow it. 214 * If root is removing a file from a remote machine, only allow 215 * files sent from the remote machine to be removed. 216 * Normal users can only remove the file from where it was sent. 217 */ 218 isowner(owner, file) 219 char *owner, *file; 220 { 221 if (!strcmp(person, root) && (from == host || !strcmp(from, file+6))) 222 return(1); 223 if (!strcmp(person, owner) && !strcmp(from, file+6)) 224 return(1); 225 if (from != host) 226 printf("%s: ", host); 227 printf("%s: Permission denied\n", file); 228 return(0); 229 } 230 231 /* 232 * Check to see if we are sending files to a remote machine. If we are, 233 * then try removing files on the remote machine. 234 */ 235 chkremote() 236 { 237 register char *cp; 238 register int i, rem; 239 char buf[BUFSIZ]; 240 241 if (*LP || RM == NULL) 242 return; /* not sending to a remote machine */ 243 244 /* 245 * Flush stdout so the user can see what has been deleted 246 * while we wait (possibly) for the connection. 247 */ 248 fflush(stdout); 249 250 sprintf(buf, "\5%s %s", RP, all ? "-all" : person); 251 cp = buf; 252 for (i = 0; i < users; i++) { 253 cp += strlen(cp); 254 *cp++ = ' '; 255 strcpy(cp, user[i]); 256 } 257 for (i = 0; i < requests; i++) { 258 cp += strlen(cp); 259 (void) sprintf(cp, " %d", requ[i]); 260 } 261 strcat(cp, "\n"); 262 rem = getport(RM); 263 if (rem < 0) { 264 if (from != host) 265 printf("%s: ", host); 266 printf("connection to %s is down\n", RM); 267 } else { 268 i = strlen(buf); 269 if (write(rem, buf, i) != i) 270 fatal("Lost connection"); 271 while ((i = read(rem, buf, sizeof(buf))) > 0) 272 (void) fwrite(buf, 1, i, stdout); 273 (void) close(rem); 274 } 275 } 276 277 /* 278 * Return 1 if the filename begins with 'cf' 279 */ 280 iscf(d) 281 struct direct *d; 282 { 283 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 284 } 285