| 1 | /* getpwent(), getpwuid(), getpwnam() - password file routines
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| 2 | *
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| 3 | * Author: Kees J. Bot
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| 4 | * 31 Jan 1994
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| 5 | */
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| 6 | #define nil 0
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| 7 | #define open _open
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| 8 | #define fcntl _fcntl
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| 9 | #define read _read
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| 10 | #define close _close
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| 11 | #include <sys/types.h>
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| 12 | #include <pwd.h>
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| 13 | #include <string.h>
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| 14 | #include <stdlib.h>
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| 15 | #include <unistd.h>
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| 16 | #include <fcntl.h>
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| 17 |
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| 18 | #define arraysize(a) (sizeof(a) / sizeof((a)[0]))
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| 19 | #define arraylimit(a) ((a) + arraysize(a))
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| 20 |
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| 21 | static char PASSWD[]= "/etc/passwd"; /* The password file. */
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| 22 | static const char *pwfile; /* Current password file. */
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| 23 |
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| 24 | static char buf[1024]; /* Read buffer. */
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| 25 | static char pwline[256]; /* One line from the password file. */
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| 26 | static struct passwd entry; /* Entry to fill and return. */
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| 27 | static int pwfd= -1; /* Filedescriptor to the file. */
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| 28 | static char *bufptr; /* Place in buf. */
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| 29 | static ssize_t buflen= 0; /* Remaining characters in buf. */
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| 30 | static char *lineptr; /* Place in the line. */
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| 31 |
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| 32 | void endpwent(void)
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| 33 | /* Close the password file. */
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| 34 | {
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| 35 | if (pwfd >= 0) {
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| 36 | (void) close(pwfd);
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| 37 | pwfd= -1;
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| 38 | buflen= 0;
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| 39 | }
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| 40 | }
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| 41 |
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| 42 | int setpwent(void)
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| 43 | /* Open the password file. */
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| 44 | {
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| 45 | if (pwfd >= 0) endpwent();
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| 46 |
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| 47 | if (pwfile == nil) pwfile= PASSWD;
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| 48 |
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| 49 | if ((pwfd= open(pwfile, O_RDONLY)) < 0) return -1;
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| 50 | (void) fcntl(pwfd, F_SETFD, fcntl(pwfd, F_GETFD) | FD_CLOEXEC);
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| 51 | return 0;
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| 52 | }
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| 53 |
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| 54 | void setpwfile(const char *file)
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| 55 | /* Prepare for reading an alternate password file. */
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| 56 | {
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| 57 | endpwent();
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| 58 | pwfile= file;
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| 59 | }
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| 60 |
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| 61 | static int getline(void)
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| 62 | /* Get one line from the password file, return 0 if bad or EOF. */
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| 63 | {
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| 64 | lineptr= pwline;
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| 65 |
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| 66 | do {
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| 67 | if (buflen == 0) {
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| 68 | if ((buflen= read(pwfd, buf, sizeof(buf))) <= 0)
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| 69 | return 0;
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| 70 | bufptr= buf;
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| 71 | }
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| 72 |
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| 73 | if (lineptr == arraylimit(pwline)) return 0;
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| 74 | buflen--;
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| 75 | } while ((*lineptr++ = *bufptr++) != '\n');
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| 76 |
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| 77 | lineptr= pwline;
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| 78 | return 1;
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| 79 | }
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| 80 |
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| 81 | static char *scan_colon(void)
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| 82 | /* Scan for a field separator in a line, return the start of the field. */
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| 83 | {
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| 84 | char *field= lineptr;
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| 85 | char *last;
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| 86 |
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| 87 | for (;;) {
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| 88 | last= lineptr;
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| 89 | if (*lineptr == 0) return nil;
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| 90 | if (*lineptr == '\n') break;
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| 91 | if (*lineptr++ == ':') break;
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| 92 | }
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| 93 | *last= 0;
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| 94 | return field;
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| 95 | }
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| 96 |
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| 97 | struct passwd *getpwent(void)
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| 98 | /* Read one entry from the password file. */
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| 99 | {
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| 100 | char *p;
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| 101 |
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| 102 | /* Open the file if not yet open. */
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| 103 | if (pwfd < 0 && setpwent() < 0) return nil;
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| 104 |
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| 105 | /* Until a good line is read. */
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| 106 | for (;;) {
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| 107 | if (!getline()) return nil; /* EOF or corrupt. */
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| 108 |
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| 109 | if ((entry.pw_name= scan_colon()) == nil) continue;
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| 110 | if ((entry.pw_passwd= scan_colon()) == nil) continue;
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| 111 | if ((p= scan_colon()) == nil) continue;
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| 112 | entry.pw_uid= strtol(p, nil, 0);
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| 113 | if ((p= scan_colon()) == nil) continue;
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| 114 | entry.pw_gid= strtol(p, nil, 0);
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| 115 | if ((entry.pw_gecos= scan_colon()) == nil) continue;
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| 116 | if ((entry.pw_dir= scan_colon()) == nil) continue;
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| 117 | if ((entry.pw_shell= scan_colon()) == nil) continue;
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| 118 |
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| 119 | if (*lineptr == 0) return &entry;
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| 120 | }
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| 121 | }
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| 122 |
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| 123 | struct passwd *getpwuid(_mnx_Uid_t uid)
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| 124 | /* Return the password file entry belonging to the user-id. */
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| 125 | {
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| 126 | struct passwd *pw;
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| 127 |
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| 128 | endpwent();
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| 129 | while ((pw= getpwent()) != nil && pw->pw_uid != uid) {}
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| 130 | endpwent();
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| 131 | return pw;
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| 132 | }
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| 133 |
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| 134 | struct passwd *getpwnam(const char *name)
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| 135 | /* Return the password file entry belonging to the user name. */
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| 136 | {
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| 137 | struct passwd *pw;
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| 138 |
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| 139 | endpwent();
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| 140 | while ((pw= getpwent()) != nil && strcmp(pw->pw_name, name) != 0) {}
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| 141 | endpwent();
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| 142 | return pw;
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| 143 | }
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