| 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 | long tickcount_offset = 0; |
| 17 | |
| 18 | unsigned long getticks(void) |
| 19 | { |
| 20 | struct timeval tv; |
| 21 | gettimeofday(&tv, NULL); |
| 22 | /* |
| 23 | * We want to use milliseconds rather than microseconds, |
| 24 | * because we need a decent number of them to fit into a 32-bit |
| 25 | * word so it can be used for keepalives. |
| 26 | */ |
| 27 | return tv.tv_sec * 1000 + tv.tv_usec / 1000 + tickcount_offset; |
| 28 | } |
| 29 | |
| 30 | Filename filename_from_str(const char *str) |
| 31 | { |
| 32 | Filename ret; |
| 33 | strncpy(ret.path, str, sizeof(ret.path)); |
| 34 | ret.path[sizeof(ret.path)-1] = '\0'; |
| 35 | return ret; |
| 36 | } |
| 37 | |
| 38 | const char *filename_to_str(const Filename *fn) |
| 39 | { |
| 40 | return fn->path; |
| 41 | } |
| 42 | |
| 43 | int filename_equal(Filename f1, Filename f2) |
| 44 | { |
| 45 | return !strcmp(f1.path, f2.path); |
| 46 | } |
| 47 | |
| 48 | int filename_is_null(Filename fn) |
| 49 | { |
| 50 | return !*fn.path; |
| 51 | } |
| 52 | |
| 53 | #ifdef DEBUG |
| 54 | static FILE *debug_fp = NULL; |
| 55 | |
| 56 | void dputs(char *buf) |
| 57 | { |
| 58 | if (!debug_fp) { |
| 59 | debug_fp = fopen("debug.log", "w"); |
| 60 | } |
| 61 | |
| 62 | write(1, buf, strlen(buf)); |
| 63 | |
| 64 | fputs(buf, debug_fp); |
| 65 | fflush(debug_fp); |
| 66 | } |
| 67 | #endif |
| 68 | |
| 69 | char *get_username(void) |
| 70 | { |
| 71 | struct passwd *p; |
| 72 | uid_t uid = getuid(); |
| 73 | char *user, *ret = NULL; |
| 74 | |
| 75 | /* |
| 76 | * First, find who we think we are using getlogin. If this |
| 77 | * agrees with our uid, we'll go along with it. This should |
| 78 | * allow sharing of uids between several login names whilst |
| 79 | * coping correctly with people who have su'ed. |
| 80 | */ |
| 81 | user = getlogin(); |
| 82 | setpwent(); |
| 83 | if (user) |
| 84 | p = getpwnam(user); |
| 85 | else |
| 86 | p = NULL; |
| 87 | if (p && p->pw_uid == uid) { |
| 88 | /* |
| 89 | * The result of getlogin() really does correspond to |
| 90 | * our uid. Fine. |
| 91 | */ |
| 92 | ret = user; |
| 93 | } else { |
| 94 | /* |
| 95 | * If that didn't work, for whatever reason, we'll do |
| 96 | * the simpler version: look up our uid in the password |
| 97 | * file and map it straight to a name. |
| 98 | */ |
| 99 | p = getpwuid(uid); |
| 100 | if (!p) |
| 101 | return NULL; |
| 102 | ret = p->pw_name; |
| 103 | } |
| 104 | endpwent(); |
| 105 | |
| 106 | return dupstr(ret); |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Display the fingerprints of the PGP Master Keys to the user. |
| 111 | * (This is here rather than in uxcons because it's appropriate even for |
| 112 | * Unix GUI apps.) |
| 113 | */ |
| 114 | void pgp_fingerprints(void) |
| 115 | { |
| 116 | fputs("These are the fingerprints of the PuTTY PGP Master Keys. They can\n" |
| 117 | "be used to establish a trust path from this executable to another\n" |
| 118 | "one. See the manual for more information.\n" |
| 119 | "(Note: these fingerprints have nothing to do with SSH!)\n" |
| 120 | "\n" |
| 121 | "PuTTY Master Key (RSA), 1024-bit:\n" |
| 122 | " " PGP_RSA_MASTER_KEY_FP "\n" |
| 123 | "PuTTY Master Key (DSA), 1024-bit:\n" |
| 124 | " " PGP_DSA_MASTER_KEY_FP "\n", stdout); |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * Set FD_CLOEXEC on a file descriptor |
| 129 | */ |
| 130 | int cloexec(int fd) { |
| 131 | int fdflags; |
| 132 | |
| 133 | fdflags = fcntl(fd, F_GETFD); |
| 134 | if (fdflags == -1) return -1; |
| 135 | return fcntl(fd, F_SETFD, fdflags | FD_CLOEXEC); |
| 136 | } |
| 137 | |
| 138 | FILE *f_open(struct Filename filename, char const *mode, int is_private) |
| 139 | { |
| 140 | if (!is_private) { |
| 141 | return fopen(filename.path, mode); |
| 142 | } else { |
| 143 | int fd; |
| 144 | assert(mode[0] == 'w'); /* is_private is meaningless for read, |
| 145 | and tricky for append */ |
| 146 | fd = open(filename.path, O_WRONLY | O_CREAT | O_TRUNC, |
| 147 | 0700); |
| 148 | if (fd < 0) |
| 149 | return NULL; |
| 150 | return fdopen(fd, mode); |
| 151 | } |
| 152 | } |