git.distorted.org.uk Git - u/mdw/putty/blob - unix/uxmisc.c

   1 /*
   2  * PuTTY miscellaneous Unix stuff
   3  */
   4
   5 #include <fcntl.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <sys/time.h>
  10 #include <sys/types.h>
  11 #include <pwd.h>
  12
  13 #include "putty.h"
  14
  15 long tickcount_offset = 0;
  16
  17 unsigned long getticks(void)
  18 {
  19     struct timeval tv;
  20     gettimeofday(&tv, NULL);
  21     /*
  22      * We want to use milliseconds rather than microseconds,
  23      * because we need a decent number of them to fit into a 32-bit
  24      * word so it can be used for keepalives.
  25      */
  26     return tv.tv_sec * 1000 + tv.tv_usec / 1000 + tickcount_offset;
  27 }
  28
  29 Filename filename_from_str(const char *str)
  30 {
  31     Filename ret;
  32     strncpy(ret.path, str, sizeof(ret.path));
  33     ret.path[sizeof(ret.path)-1] = '\0';
  34     return ret;
  35 }
  36
  37 const char *filename_to_str(const Filename *fn)
  38 {
  39     return fn->path;
  40 }
  41
  42 int filename_equal(Filename f1, Filename f2)
  43 {
  44     return !strcmp(f1.path, f2.path);
  45 }
  46
  47 int filename_is_null(Filename fn)
  48 {
  49     return !*fn.path;
  50 }
  51
  52 #ifdef DEBUG
  53 static FILE *debug_fp = NULL;
  54
  55 void dputs(char *buf)
  56 {
  57     if (!debug_fp) {
  58         debug_fp = fopen("debug.log", "w");
  59     }
  60
  61     write(1, buf, strlen(buf));
  62
  63     fputs(buf, debug_fp);
  64     fflush(debug_fp);
  65 }
  66 #endif
  67
  68 char *get_username(void)
  69 {
  70     struct passwd *p;
  71     uid_t uid = getuid();
  72     char *user, *ret = NULL;
  73
  74     /*
  75      * First, find who we think we are using getlogin. If this
  76      * agrees with our uid, we'll go along with it. This should
  77      * allow sharing of uids between several login names whilst
  78      * coping correctly with people who have su'ed.
  79      */
  80     user = getlogin();
  81     setpwent();
  82     if (user)
  83         p = getpwnam(user);
  84     else
  85         p = NULL;
  86     if (p && p->pw_uid == uid) {
  87         /*
  88          * The result of getlogin() really does correspond to
  89          * our uid. Fine.
  90          */
  91         ret = user;
  92     } else {
  93         /*
  94          * If that didn't work, for whatever reason, we'll do
  95          * the simpler version: look up our uid in the password
  96          * file and map it straight to a name.
  97          */
  98         p = getpwuid(uid);
  99         if (!p)
 100             return NULL;
 101         ret = p->pw_name;
 102     }
 103     endpwent();
 104
 105     return dupstr(ret);
 106 }
 107
 108 /*
 109  * Display the fingerprints of the PGP Master Keys to the user.
 110  * (This is here rather than in uxcons because it's appropriate even for
 111  * Unix GUI apps.)
 112  */
 113 void pgp_fingerprints(void)
 114 {
 115     fputs("These are the fingerprints of the PuTTY PGP Master Keys. They can\n"
 116           "be used to establish a trust path from this executable to another\n"
 117           "one. See the manual for more information.\n"
 118           "(Note: these fingerprints have nothing to do with SSH!)\n"
 119           "\n"
 120           "PuTTY Master Key (RSA), 1024-bit:\n"
 121           "  " PGP_RSA_MASTER_KEY_FP "\n"
 122           "PuTTY Master Key (DSA), 1024-bit:\n"
 123           "  " PGP_DSA_MASTER_KEY_FP "\n", stdout);
 124 }
 125
 126 /*
 127  * Set FD_CLOEXEC on a file descriptor
 128  */
 129 int cloexec(int fd) {
 130     int fdflags;
 131
 132     fdflags = fcntl(fd, F_GETFD);
 133     if (fdflags == -1) return -1;
 134     return fcntl(fd, F_SETFD, fdflags | FD_CLOEXEC);
 135 }