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 <assert.h>
   9 #include <unistd.h>
  10 #include <sys/time.h>
  11 #include <sys/types.h>
  12 #include <pwd.h>
  13
  14 #include "putty.h"
  15
  16 unsigned long getticks(void)
  17 {
  18     struct timeval tv;
  19     gettimeofday(&tv, NULL);
  20     /*
  21      * We want to use milliseconds rather than microseconds,
  22      * because we need a decent number of them to fit into a 32-bit
  23      * word so it can be used for keepalives.
  24      */
  25     return tv.tv_sec * TICKSPERSEC + tv.tv_usec / (1000000 / TICKSPERSEC);
  26 }
  27
  28 Filename *filename_from_str(const char *str)
  29 {
  30     Filename *ret = snew(Filename);
  31     ret->path = dupstr(str);
  32     return ret;
  33 }
  34
  35 Filename *filename_copy(const Filename *fn)
  36 {
  37     return filename_from_str(fn->path);
  38 }
  39
  40 const char *filename_to_str(const Filename *fn)
  41 {
  42     return fn->path;
  43 }
  44
  45 int filename_equal(const Filename *f1, const Filename *f2)
  46 {
  47     return !strcmp(f1->path, f2->path);
  48 }
  49
  50 int filename_is_null(const Filename *fn)
  51 {
  52     return !fn->path[0];
  53 }
  54
  55 void filename_free(Filename *fn)
  56 {
  57     sfree(fn->path);
  58     sfree(fn);
  59 }
  60
  61 int filename_serialise(const Filename *f, void *vdata)
  62 {
  63     char *data = (char *)vdata;
  64     int len = strlen(f->path) + 1;     /* include trailing NUL */
  65     if (data) {
  66         strcpy(data, f->path);
  67     }
  68     return len;
  69 }
  70 Filename *filename_deserialise(void *vdata, int maxsize, int *used)
  71 {
  72     char *data = (char *)vdata;
  73     char *end;
  74     end = memchr(data, '\0', maxsize);
  75     if (!end)
  76         return NULL;
  77     end++;
  78     *used = end - data;
  79     return filename_from_str(data);
  80 }
  81
  82 #ifdef DEBUG
  83 static FILE *debug_fp = NULL;
  84
  85 void dputs(char *buf)
  86 {
  87     if (!debug_fp) {
  88         debug_fp = fopen("debug.log", "w");
  89     }
  90
  91     write(1, buf, strlen(buf));
  92
  93     fputs(buf, debug_fp);
  94     fflush(debug_fp);
  95 }
  96 #endif
  97
  98 char *get_username(void)
  99 {
 100     struct passwd *p;
 101     uid_t uid = getuid();
 102     char *user, *ret = NULL;
 103
 104     /*
 105      * First, find who we think we are using getlogin. If this
 106      * agrees with our uid, we'll go along with it. This should
 107      * allow sharing of uids between several login names whilst
 108      * coping correctly with people who have su'ed.
 109      */
 110     user = getlogin();
 111     setpwent();
 112     if (user)
 113         p = getpwnam(user);
 114     else
 115         p = NULL;
 116     if (p && p->pw_uid == uid) {
 117         /*
 118          * The result of getlogin() really does correspond to
 119          * our uid. Fine.
 120          */
 121         ret = user;
 122     } else {
 123         /*
 124          * If that didn't work, for whatever reason, we'll do
 125          * the simpler version: look up our uid in the password
 126          * file and map it straight to a name.
 127          */
 128         p = getpwuid(uid);
 129         if (!p)
 130             return NULL;
 131         ret = p->pw_name;
 132     }
 133     endpwent();
 134
 135     return dupstr(ret);
 136 }
 137
 138 /*
 139  * Display the fingerprints of the PGP Master Keys to the user.
 140  * (This is here rather than in uxcons because it's appropriate even for
 141  * Unix GUI apps.)
 142  */
 143 void pgp_fingerprints(void)
 144 {
 145     fputs("These are the fingerprints of the PuTTY PGP Master Keys. They can\n"
 146           "be used to establish a trust path from this executable to another\n"
 147           "one. See the manual for more information.\n"
 148           "(Note: these fingerprints have nothing to do with SSH!)\n"
 149           "\n"
 150           "PuTTY Master Key (RSA), 1024-bit:\n"
 151           "  " PGP_RSA_MASTER_KEY_FP "\n"
 152           "PuTTY Master Key (DSA), 1024-bit:\n"
 153           "  " PGP_DSA_MASTER_KEY_FP "\n", stdout);
 154 }
 155
 156 /*
 157  * Set FD_CLOEXEC on a file descriptor
 158  */
 159 int cloexec(int fd) {
 160     int fdflags;
 161
 162     fdflags = fcntl(fd, F_GETFD);
 163     if (fdflags == -1) return -1;
 164     return fcntl(fd, F_SETFD, fdflags | FD_CLOEXEC);
 165 }
 166
 167 FILE *f_open(const Filename *filename, char const *mode, int is_private)
 168 {
 169     if (!is_private) {
 170         return fopen(filename->path, mode);
 171     } else {
 172         int fd;
 173         assert(mode[0] == 'w');        /* is_private is meaningless for read,
 174                                           and tricky for append */
 175         fd = open(filename->path, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 176         if (fd < 0)
 177             return NULL;
 178         return fdopen(fd, mode);
 179     }
 180 }
 181
 182 FontSpec *fontspec_new(const char *name)
 183 {
 184     FontSpec *f = snew(FontSpec);
 185     f->name = dupstr(name);
 186     return f;
 187 }
 188 FontSpec *fontspec_copy(const FontSpec *f)
 189 {
 190     return fontspec_new(f->name);
 191 }
 192 void fontspec_free(FontSpec *f)
 193 {
 194     sfree(f->name);
 195     sfree(f);
 196 }
 197 int fontspec_serialise(FontSpec *f, void *data)
 198 {
 199     int len = strlen(f->name);
 200     if (data)
 201         strcpy(data, f->name);
 202     return len + 1;                    /* include trailing NUL */
 203 }
 204 FontSpec *fontspec_deserialise(void *vdata, int maxsize, int *used)
 205 {
 206     char *data = (char *)vdata;
 207     char *end = memchr(data, '\0', maxsize);
 208     if (!end)
 209         return NULL;
 210     *used = end - data + 1;
 211     return fontspec_new(data);
 212 }