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/* See LICENSE file for copyright and license details. */
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "arg.h"
char *argv0;
static void
usage(void)
{
fprintf(stderr, "usage: %s [user] ...\n", argv0);
exit(1);
}
static int
outputkey(char *data, size_t whead, size_t *rheadp, size_t *rhead2p, size_t *linenop, const char *user)
{
int failed = 0;
size_t len;
while (*rhead2p < whead || data[*rhead2p] != '\n')
++*rhead2p;
if (data[*rhead2p] != '\n')
return 0;
len = *rhead2p - *rheadp;
*linenop += 1;
if (memchr(&data[*rheadp], '\0', len)) {
fprintf(stderr, "%s: NUL byte found in %s/%s on line %zu\n", argv0, KEYPATH, user, *linenop);
failed = 1;
}
if (!memchr(&data[*rheadp], ' ', len)) {
fprintf(stderr, "%s: no SP byte found in %s/%s on line %zu\n", argv0, KEYPATH, user, *linenop);
failed = 1;
}
if (!failed) {
data[*rhead2p] = '\0';
printf("%s %s\n", user, &data[*rheadp]);
}
*rheadp = ++*rhead2p;
return failed;
}
static int
listkeys(int dir, const char *user)
{
int fd, failed = 0;
char *data = NULL, *new;
size_t size = 0;
size_t whead = 0;
size_t rhead = 0;
size_t rhead2 = 0;
size_t lineno = 0;
ssize_t r = 1;
fd = openat(dir, user, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
return 0;
fprintf(stderr, "%s: openat %s/ %s O_RDONLY: %s\n", argv0, KEYPATH, user, strerror(errno));
return 1;
}
while (r) {
if (whead == size) {
memmove(data, &data[rhead], whead -= rhead);
rhead2 -= rhead;
rhead = 0;
if (whead == size) {
new = realloc(data, size += 1024);
if (!new) {
fprintf(stderr, "%s: realloc: %s\n", argv0, strerror(errno));
close(fd);
return 1;
}
data = new;
}
}
r = read(fd, &data[whead], size - whead);
if (r < 0) {
fprintf(stderr, "%s: read %s/%s: %s\n", argv0, KEYPATH, user, strerror(errno));
close(fd);
return 1;
}
whead += (size_t)r;
while (rhead2 < whead)
failed |= outputkey(data, whead, &rhead, &rhead2, &lineno, user);
}
if (rhead != whead) {
failed = 1;
fprintf(stderr, "%s: file truncated: %s/%s\n", argv0, KEYPATH, user);
if (memchr(&data[rhead], '\0', whead - rhead))
fprintf(stderr, "%s: NUL byte found in %s/%s on line %zu\n", argv0, KEYPATH, user, lineno + 1);
}
close(fd);
return failed;
}
int
main(int argc, char *argv[])
{
int failed = 0, fd;
DIR *dir;
struct dirent *f;
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc) {
fd = open(KEYPATH"/", O_PATH);
if (fd < 0) {
if (errno == ENOENT)
return 0;
fprintf(stderr, "%s: open %s/ O_PATH: %s\n", argv0, KEYPATH, strerror(errno));
exit(1);
}
for (; *argv; argv++) {
if (!(*argv)[0] || (*argv)[0] == '.' || strchr(*argv, '/') || strchr(*argv, '~')) {
fprintf(stderr, "%s: bad user name specified: %s\n", argv0, *argv);
failed = 1;
} else {
failed |= listkeys(fd, *argv);
}
}
close(fd);
} else {
dir = opendir(KEYPATH"/");
if (!dir) {
if (errno == ENOENT)
return 0;
fprintf(stderr, "%s: opendir %s/: %s\n", argv0, KEYPATH, strerror(errno));
exit(1);
}
fd = dirfd(dir);
if (fd < 0)
abort();
while ((errno = 0, f = readdir(dir))) {
if (f->d_name[0] == '.' || strchr(f->d_name, '~'))
continue;
listkeys(fd, f->d_name);
}
if (errno || closedir(dir)) {
fprintf(stderr, "%s: readdir %s/: %s\n", argv0, KEYPATH, strerror(errno));
exit(1);
}
}
if (fflush(stdout) || ferror(stdout) || fclose(stdout)) {
fprintf(stderr, "%s: print: %s\n", argv0, strerror(errno));
exit(1);
}
return failed;
}
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