1 /* rmjob.c 4.4 83/06/02 */ 2 /* 3 * rmjob - remove the specified jobs from the queue. 4 */ 5 6 #include "lp.h" 7 8 /* 9 * Stuff for handling lprm specifications 10 */ 11 extern char *user[]; /* users to process */ 12 extern int users; /* # of users in user array */ 13 extern int requ[]; /* job number of spool entries */ 14 extern int requests; /* # of spool requests */ 15 extern char *person; /* name of person doing lprm */ 16 17 static char root[] = "root"; 18 static int all = 0; /* eliminate all files (root only) */ 19 static int cur_daemon; /* daemon's pid */ 20 static char current[40]; /* active control file name */ 21 22 int iscf(); 23 24 rmjob() 25 { 26 register int i, nitems; 27 int assasinated = 0; 28 struct direct **files; 29 30 if ((i = pgetent(line, printer)) < 0) 31 fatal("cannot open printer description file"); 32 else if (i == 0) 33 fatal("unknown printer"); 34 if ((SD = pgetstr("sd", &bp)) == NULL) 35 SD = DEFSPOOL; 36 if ((LO = pgetstr("lo", &bp)) == NULL) 37 LO = DEFLOCK; 38 if ((LP = pgetstr("lp", &bp)) == NULL) 39 LP = DEFDEVLP; 40 if ((RP = pgetstr("rp", &bp)) == NULL) 41 RP = DEFLP; 42 RM = pgetstr("rm", &bp); 43 44 /* 45 * If the format was `lprm -' and the user isn't the super-user, 46 * then fake things to look like he said `lprm user'. 47 */ 48 if (users < 0) { 49 if (getuid() == 0) 50 all = 1; /* all files in local queue */ 51 else { 52 user[0] = person; 53 users = 1; 54 } 55 } 56 if (!strcmp(person, "-all")) { 57 if (from == host) 58 fatal("The login name \"-all\" is reserved"); 59 all = 1; /* all those from 'from' */ 60 person = root; 61 } 62 63 if (chdir(SD) < 0) 64 fatal("cannot chdir to spool directory"); 65 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 66 fatal("cannot access spool directory"); 67 68 if (nitems) { 69 /* 70 * Check for an active printer daemon (in which case we 71 * kill it if it is reading our file) then remove stuff 72 * (after which we have to restart the daemon). 73 */ 74 if (lockchk(LO) && chk(current)) { 75 assasinated = kill(cur_daemon, SIGINT) == 0; 76 if (!assasinated) 77 fatal("cannot kill printer daemon"); 78 } 79 /* 80 * process the files 81 */ 82 for (i = 0; i < nitems; i++) 83 process(files[i]->d_name); 84 } 85 chkremote(); 86 /* 87 * Restart the printer daemon if it was killed 88 */ 89 if (assasinated && !startdaemon(host)) 90 fatal("cannot restart printer daemon\n"); 91 exit(0); 92 } 93 94 /* 95 * Process a lock file: collect the pid of the active 96 * daemon and the file name of the active spool entry. 97 * Return boolean indicating existence of a lock file. 98 */ 99 static 100 lockchk(s) 101 char *s; 102 { 103 register FILE *fp; 104 register int i, n; 105 106 if ((fp = fopen(s, "r")) == NULL) 107 if (errno == EACCES) 108 fatal("can't access lock file"); 109 else 110 return(0); 111 if (!getline(fp) || flock(fileno(fp), FSHLOCK|FNBLOCK) == 0) { 112 (void) fclose(fp); 113 return(0); /* no daemon present */ 114 } 115 cur_daemon = atoi(line); 116 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 117 if (i > 5) { 118 n = 1; 119 break; 120 } 121 sleep(i); 122 } 123 current[n-1] = '\0'; 124 (void) fclose(fp); 125 return(1); 126 } 127 128 /* 129 * Process a control file. 130 */ 131 static 132 process(file) 133 char *file; 134 { 135 FILE *cfp; 136 137 if (!chk(file)) 138 return; 139 if ((cfp = fopen(file, "r")) == NULL) 140 fatal("cannot open %s", file); 141 while (getline()) { 142 switch (line[0]) { 143 case 'U': /* unlink associated files */ 144 if (from != host) 145 printf("%s: ", host); 146 printf(unlink(line+1) ? "cannot dequeue %s\n" : 147 "%s dequeued\n", line+1); 148 } 149 } 150 (void) fclose(cfp); 151 if (from != host) 152 printf("%s: ", host); 153 printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file); 154 } 155 156 /* 157 * Do the dirty work in checking 158 */ 159 static 160 chk(file) 161 char *file; 162 { 163 register int *r, n; 164 register char **u, *cp; 165 FILE *cfp; 166 167 if (all && (from == host || !strcmp(from, file+6))) 168 return(1); 169 170 /* 171 * get the owner's name from the control file. 172 */ 173 if ((cfp = fopen(file, "r")) == NULL) 174 return(0); 175 while (getline(cfp)) { 176 if (line[0] == 'P') 177 break; 178 } 179 (void) fclose(cfp); 180 if (line[0] != 'P') 181 return(0); 182 183 if (users == 0 && requests == 0) 184 return(!strcmp(file, current) && isowner(line+1, file)); 185 /* 186 * Check the request list 187 */ 188 for (n = 0, cp = file+3; isdigit(*cp); ) 189 n = n * 10 + (*cp++ - '0'); 190 for (r = requ; r < &requ[requests]; r++) 191 if (*r == n && isowner(line+1, file)) 192 return(1); 193 /* 194 * Check to see if it's in the user list 195 */ 196 for (u = user; u < &user[users]; u++) 197 if (!strcmp(*u, line+1) && isowner(line+1, file)) 198 return(1); 199 return(0); 200 } 201 202 /* 203 * If root is removing a file on the local machine, allow it. 204 * If root is removing a file from a remote machine, only allow 205 * files sent from the remote machine to be removed. 206 * Normal users can only remove the file from where it was sent. 207 */ 208 static 209 isowner(owner, file) 210 char *owner, *file; 211 { 212 if (!strcmp(person, root) && (from == host || !strcmp(from, file+6))) 213 return(1); 214 if (!strcmp(person, owner) && !strcmp(from, file+6)) 215 return(1); 216 if (from != host) 217 printf("%s: ", host); 218 printf("%s: Permission denied\n", file); 219 return(0); 220 } 221 222 /* 223 * Check to see if we are sending files to a remote machine. If we are, 224 * then try removing files on the remote machine. 225 */ 226 static 227 chkremote() 228 { 229 register char *cp; 230 register int i, rem; 231 char buf[BUFSIZ]; 232 233 if (*LP || RM == NULL) 234 return; /* not sending to a remote machine */ 235 236 /* 237 * Flush stdout so the user can see what has been deleted 238 * while we wait (possibly) for the connection. 239 */ 240 fflush(stdout); 241 242 sprintf(buf, "\5%s %s", RP, all ? "-all" : person); 243 cp = buf; 244 for (i = 0; i < users; i++) { 245 cp += strlen(cp); 246 *cp++ = ' '; 247 strcpy(cp, user[i]); 248 } 249 for (i = 0; i < requests; i++) { 250 cp += strlen(cp); 251 (void) sprintf(cp, " %d", requ[i]); 252 } 253 strcat(cp, "\n"); 254 rem = getport(RM); 255 if (rem < 0) { 256 if (from != host) 257 printf("%s: ", host); 258 printf("connection to %s is down\n", RM); 259 } else { 260 i = strlen(buf); 261 if (write(rem, buf, i) != i) 262 fatal("Lost connection"); 263 while ((i = read(rem, buf, sizeof(buf))) > 0) 264 (void) fwrite(buf, 1, i, stdout); 265 (void) close(rem); 266 } 267 } 268 269 /* 270 * Return 1 if the filename begins with 'cf' 271 */ 272 static 273 iscf(d) 274 struct direct *d; 275 { 276 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 277 } 278