1 | /* This file is part of the Project Athena Global Message System. |
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2 | * Created by: Mark W. Eichin <eichin@athena.mit.edu> |
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3 | * $Source: /afs/dev.mit.edu/source/repository/athena/bin/gms/check_viewable.c,v $ |
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4 | * $Author: eichin $ |
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5 | * |
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6 | * Copyright (c) 1988 by the Massachusetts Institute of Technology. |
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7 | * For copying and distribution information, see the file |
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8 | * "mit-copyright.h". |
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9 | */ |
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10 | #include <mit-copyright.h> |
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11 | #ifndef lint |
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12 | static char rcsid_check_viewable_c[] = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/gms/check_viewable.c,v 1.4 1988-10-03 16:52:52 eichin Exp $"; |
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13 | #endif lint |
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14 | |
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15 | #include "globalmessage.h" |
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16 | #include <strings.h> |
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17 | #include <sys/types.h> |
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18 | #include <sys/file.h> |
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19 | #include <pwd.h> |
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20 | |
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21 | Code_t check_viewable(message, checktime, updateuser) |
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22 | char *message; |
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23 | int checktime; /* should we check the timestamp at all? */ |
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24 | int updateuser; /* should we update the user timestamp file? */ |
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25 | { |
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26 | char *ptr, *usertfile; |
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27 | time_t ftime, utime; |
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28 | int status, usersize, ufd; |
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29 | char *usertfilename; |
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30 | |
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31 | if(strncmp(message, GMS_VERSION_STRING, GMS_VERSION_STRING_LEN)) { |
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32 | return(GMS_SERVER_VERSION); |
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33 | } |
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34 | |
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35 | ptr = index(message, '\n'); |
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36 | if(!ptr) { |
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37 | return(GMS_SERVER_GARBLED); |
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38 | } |
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39 | |
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40 | ftime = atol(&message[GMS_VERSION_STRING_LEN+1]); |
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41 | |
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42 | { |
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43 | struct passwd *pw; |
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44 | char *userdir; |
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45 | |
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46 | pw = getpwuid(getuid()); |
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47 | |
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48 | if(pw) { |
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49 | userdir = pw->pw_dir; |
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50 | } else { |
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51 | /* couldn't check user's file, probably better send it. */ |
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52 | free(usertfilename); |
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53 | return(0); |
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54 | } |
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55 | |
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56 | usertfilename = malloc(GMS_USERFILE_NAME_LEN+strlen(userdir)+1); |
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57 | strcpy(usertfilename, userdir); |
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58 | strcat(usertfilename, GMS_USERFILE_NAME); |
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59 | |
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60 | ufd = open(usertfilename, O_RDONLY, 0666); |
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61 | } |
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62 | |
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63 | if(ufd != -1) { |
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64 | /* read the file and close it */ |
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65 | status = read_to_memory(&usertfile, &usersize, ufd); |
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66 | /* check the version string */ |
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67 | if(!status) { |
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68 | if(!strncmp(usertfile, GMS_VERSION_STRING, GMS_VERSION_STRING_LEN)) { |
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69 | /* now check for end of first line */ |
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70 | ptr = index(usertfile, '\n'); |
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71 | if(ptr) { |
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72 | /* now we check the time stamp */ |
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73 | utime = atol(&usertfile[GMS_VERSION_STRING_LEN+1]); |
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74 | if(ftime <= utime) { |
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75 | /* user has already seen, we punt. */ |
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76 | free(usertfile); |
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77 | free(usertfilename); |
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78 | /* but we only punt if they have asked for it... */ |
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79 | if(checktime) { |
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80 | return(GMS_OLD_MESSAGE); |
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81 | } else { |
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82 | return(0); |
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83 | } |
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84 | } |
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85 | } |
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86 | } |
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87 | /* only valid if read_to_memory worked... */ |
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88 | free(usertfile); |
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89 | } |
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90 | } |
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91 | |
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92 | /* only write out the new time stamp if they want it. */ |
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93 | if(updateuser) { |
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94 | /* now, reopen/create the file to write new timestamp */ |
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95 | ufd = open(usertfilename, O_WRONLY|O_CREAT|O_TRUNC, 0666); |
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96 | if(ufd != -1) { |
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97 | char *msg = &message[GMS_VERSION_STRING_LEN]; |
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98 | |
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99 | /* write out the version number */ |
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100 | write(ufd, GMS_VERSION_STRING, GMS_VERSION_STRING_LEN); |
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101 | |
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102 | /* write out the timestring from the message file */ |
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103 | ptr = index(message, '\n')+1; |
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104 | write(ufd, msg, ptr - msg); |
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105 | close(ufd); |
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106 | } |
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107 | } |
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108 | /* filename no longer needed... */ |
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109 | free(usertfilename); |
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110 | /* if we tried to write, we want to print... */ |
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111 | return(0); |
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112 | } |
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113 | |
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114 | |
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115 | |
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