#include "nls.h"
#include "xalloc.h"
-static void __attribute__ ((__noreturn__)) usage(FILE * out);
-void search_utmp(char *, char *, char *, uid_t);
-void do_write(char *, char *, uid_t);
-void wr_fputs(char *);
-static void __attribute__ ((__noreturn__)) done(int);
-int term_chk(char *, int *, time_t *, int);
-int utmp_chk(char *, char *);
-
static void __attribute__ ((__noreturn__)) usage(FILE * out)
{
fputs(USAGE_HEADER, out);
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
-int main(int argc, char **argv)
+/*
+ * term_chk - check that a terminal exists, and get the message bit
+ * and the access time
+ */
+static int term_chk(char *tty, int *msgsokP, time_t * atimeP, int showerror)
{
- time_t atime;
- uid_t myuid;
- int msgsok = 0, myttyfd, c;
- char tty[PATH_MAX], *mytty;
-
- static const struct option longopts[] = {
- {"version", no_argument, NULL, 'V'},
- {"help", no_argument, NULL, 'h'},
- {NULL, 0, NULL, 0}
- };
-
- setlocale(LC_ALL, "");
- bindtextdomain(PACKAGE, LOCALEDIR);
- textdomain(PACKAGE);
- atexit(close_stdout);
-
- while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
- switch (c) {
- case 'V':
- printf(UTIL_LINUX_VERSION);
- return EXIT_SUCCESS;
- case 'h':
- usage(stdout);
- default:
- usage(stderr);
- }
-
- /* check that sender has write enabled */
- if (isatty(fileno(stdin)))
- myttyfd = fileno(stdin);
- else if (isatty(fileno(stdout)))
- myttyfd = fileno(stdout);
- else if (isatty(fileno(stderr)))
- myttyfd = fileno(stderr);
- else
- myttyfd = -1;
-
- if (myttyfd != -1) {
- if (!(mytty = ttyname(myttyfd)))
- errx(EXIT_FAILURE,
- _("can't find your tty's name"));
-
- /*
- * We may have /dev/ttyN but also /dev/pts/xx. Below,
- * term_chk() will put "/dev/" in front, so remove that
- * part.
- */
- if (!strncmp(mytty, "/dev/", 5))
- mytty += 5;
- if (term_chk(mytty, &msgsok, &atime, 1))
- exit(EXIT_FAILURE);
- if (!msgsok)
- errx(EXIT_FAILURE,
- _("you have write permission turned off"));
- msgsok = 0;
- } else
- mytty = "<no tty>";
-
- myuid = getuid();
+ struct stat s;
+ char path[PATH_MAX];
- /* check args */
- switch (argc) {
- case 2:
- search_utmp(argv[1], tty, mytty, myuid);
- do_write(tty, mytty, myuid);
- break;
- case 3:
- if (!strncmp(argv[2], "/dev/", 5))
- argv[2] += 5;
- if (utmp_chk(argv[1], argv[2]))
- errx(EXIT_FAILURE,
- _("%s is not logged in on %s"),
- argv[1], argv[2]);
- if (term_chk(argv[2], &msgsok, &atime, 1))
- exit(EXIT_FAILURE);
- if (myuid && !msgsok)
- errx(EXIT_FAILURE,
- _("%s has messages disabled on %s"),
- argv[1], argv[2]);
- do_write(argv[2], mytty, myuid);
- break;
- default:
- usage(stderr);
+ if (strlen(tty) + 6 > sizeof(path))
+ return 1;
+ sprintf(path, "/dev/%s", tty);
+ if (stat(path, &s) < 0) {
+ if (showerror)
+ warn("%s", path);
+ return 1;
}
-
- done(0);
- /* NOTREACHED */
- return EXIT_FAILURE;
+ if (getuid() == 0) /* root can always write */
+ *msgsokP = 1;
+ else
+ *msgsokP = (s.st_mode & S_IWGRP) && (getegid() == s.st_gid);
+ *atimeP = s.st_atime;
+ return 0;
}
-
/*
* utmp_chk - checks that the given user is actually logged in on
* the given tty
*/
-int utmp_chk(char *user, char *tty)
+static int utmp_chk(char *user, char *tty)
{
struct utmp u;
struct utmp *uptr;
* Special case for writing to yourself - ignore the terminal you're
* writing from, unless that's the only terminal with messages enabled.
*/
-void search_utmp(char *user, char *tty, char *mytty, uid_t myuid)
+static void search_utmp(char *user, char *tty, char *mytty, uid_t myuid)
{
struct utmp u;
struct utmp *uptr;
}
/*
- * term_chk - check that a terminal exists, and get the message bit
- * and the access time
+ * done - cleanup and exit
*/
-int term_chk(char *tty, int *msgsokP, time_t * atimeP, int showerror)
+static void __attribute__ ((__noreturn__))
+ done(int dummy __attribute__ ((__unused__)))
{
- struct stat s;
- char path[PATH_MAX];
+ printf("EOF\r\n");
+ _exit(EXIT_SUCCESS);
+}
- if (strlen(tty) + 6 > sizeof(path))
- return 1;
- sprintf(path, "/dev/%s", tty);
- if (stat(path, &s) < 0) {
- if (showerror)
- warn("%s", path);
- return 1;
+/*
+ * wr_fputs - like fputs(), but makes control characters visible and
+ * turns \n into \r\n.
+ */
+static void wr_fputs(char *s)
+{
+ char c;
+
+#define PUTC(c) if (fputc_careful(c, stdout, '^') == EOF) \
+ err(EXIT_FAILURE, _("carefulputc failed"));
+ while (*s) {
+ c = *s++;
+ if (c == '\n')
+ PUTC('\r');
+ PUTC(c);
}
- if (getuid() == 0) /* root can always write */
- *msgsokP = 1;
- else
- *msgsokP = (s.st_mode & S_IWGRP) && (getegid() == s.st_gid);
- *atimeP = s.st_atime;
- return 0;
+ return;
+#undef PUTC
}
/*
* do_write - actually make the connection
*/
-void do_write(char *tty, char *mytty, uid_t myuid)
+static void do_write(char *tty, char *mytty, uid_t myuid)
{
char *login, *pwuid, *nows;
struct passwd *pwd;
wr_fputs(line);
}
-/*
- * done - cleanup and exit
- */
-static void __attribute__ ((__noreturn__))
- done(int dummy __attribute__ ((__unused__)))
+int main(int argc, char **argv)
{
- printf("EOF\r\n");
- _exit(EXIT_SUCCESS);
-}
+ time_t atime;
+ uid_t myuid;
+ int msgsok = 0, myttyfd, c;
+ char tty[PATH_MAX], *mytty;
-/*
- * wr_fputs - like fputs(), but makes control characters visible and
- * turns \n into \r\n.
- */
-void wr_fputs(char *s)
-{
- char c;
+ static const struct option longopts[] = {
+ {"version", no_argument, NULL, 'V'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, 0, NULL, 0}
+ };
-#define PUTC(c) if (fputc_careful(c, stdout, '^') == EOF) \
- err(EXIT_FAILURE, _("carefulputc failed"));
- while (*s) {
- c = *s++;
- if (c == '\n')
- PUTC('\r');
- PUTC(c);
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
+ switch (c) {
+ case 'V':
+ printf(UTIL_LINUX_VERSION);
+ return EXIT_SUCCESS;
+ case 'h':
+ usage(stdout);
+ default:
+ usage(stderr);
+ }
+
+ /* check that sender has write enabled */
+ if (isatty(fileno(stdin)))
+ myttyfd = fileno(stdin);
+ else if (isatty(fileno(stdout)))
+ myttyfd = fileno(stdout);
+ else if (isatty(fileno(stderr)))
+ myttyfd = fileno(stderr);
+ else
+ myttyfd = -1;
+
+ if (myttyfd != -1) {
+ if (!(mytty = ttyname(myttyfd)))
+ errx(EXIT_FAILURE,
+ _("can't find your tty's name"));
+
+ /*
+ * We may have /dev/ttyN but also /dev/pts/xx. Below,
+ * term_chk() will put "/dev/" in front, so remove that
+ * part.
+ */
+ if (!strncmp(mytty, "/dev/", 5))
+ mytty += 5;
+ if (term_chk(mytty, &msgsok, &atime, 1))
+ exit(EXIT_FAILURE);
+ if (!msgsok)
+ errx(EXIT_FAILURE,
+ _("you have write permission turned off"));
+ msgsok = 0;
+ } else
+ mytty = "<no tty>";
+
+ myuid = getuid();
+
+ /* check args */
+ switch (argc) {
+ case 2:
+ search_utmp(argv[1], tty, mytty, myuid);
+ do_write(tty, mytty, myuid);
+ break;
+ case 3:
+ if (!strncmp(argv[2], "/dev/", 5))
+ argv[2] += 5;
+ if (utmp_chk(argv[1], argv[2]))
+ errx(EXIT_FAILURE,
+ _("%s is not logged in on %s"),
+ argv[1], argv[2]);
+ if (term_chk(argv[2], &msgsok, &atime, 1))
+ exit(EXIT_FAILURE);
+ if (myuid && !msgsok)
+ errx(EXIT_FAILURE,
+ _("%s has messages disabled on %s"),
+ argv[1], argv[2]);
+ do_write(argv[2], mytty, myuid);
+ break;
+ default:
+ usage(stderr);
}
- return;
-#undef PUTC
+
+ done(0);
+ /* NOTREACHED */
+ return EXIT_FAILURE;
}
projects / thirdparty / util-linux.git / commitdiff
