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/* See LICENSE file for copyright and license details. */
#include <sys/mman.h>
#include <sys/stat.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 [-r] user key-name [crypt-parameters]\n", argv0);
exit(1);
}
static int
writeall(int fd, const char *data, size_t len)
{
size_t off = 0;
ssize_t r;
while (off < len) {
r = write(fd, &data[off], len - off);
if (r < 0)
return -1;
off += (size_t)r;
}
return 0;
}
static int
checkkey(char *data, size_t whead, size_t *rheadp, size_t *rhead2p, size_t *linenop,
const char *keyname, size_t klen, const char *path)
{
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 on line %zu\n", argv0, path, *linenop);
failed = 1;
}
if (!memchr(&data[*rheadp], ' ', len)) {
fprintf(stderr, "%s: no SP byte found in %s on line %zu\n", argv0, path, *linenop);
failed = 1;
}
if (failed || klen >= len || data[*rheadp + klen] != ' ' || memcpy(&data[*rheadp], keyname, klen)) {
*rheadp = ++*rhead2p;
return 0;
} else {
++*rhead2p;
return 1;
}
}
static void
loadandlocate(size_t *beginning_out, size_t *end_out, int fd, char **datap, size_t *lenp, size_t *sizep,
const char *keyname, const char *path)
{
size_t klen = strlen(keyname);
char *new;
size_t rhead = 0;
size_t rhead2 = 0;
size_t lineno = 0;
ssize_t r = 1;
while (r) {
if (*lenp == *sizep) {
new = realloc(*datap, *sizep += 4096);
if (!new) {
fprintf(stderr, "%s: realloc: %s\n", argv0, strerror(errno));
exit(1);
}
*datap = new;
}
r = read(fd, &(*datap)[*lenp], *sizep - *lenp);
if (r < 0) {
fprintf(stderr, "%s: read %s: %s\n", argv0, path, strerror(errno));
exit(1);
}
*lenp += (size_t)r;
while (rhead2 < *lenp) {
if (!checkkey(*datap, *lenp, &rhead, &rhead2, &lineno, keyname, klen, path))
continue;
*beginning_out = rhead;
*end_out = rhead = rhead2;
}
}
if (rhead != *lenp) {
fprintf(stderr, "%s: file truncated: %s\n", argv0, path);
if (memchr(&(*datap)[rhead], '\0', *lenp - rhead))
fprintf(stderr, "%s: NUL byte found in %s on line %zu\n", argv0, path, lineno + 1);
}
}
int
main(int argc, char *argv[])
{
const char *user;
const char *keyname;
const char *parameters;
char *path, *path2;
char *data = NULL;
size_t data_len = 0;
size_t data_size = 0;
size_t beginning = 0;
size_t end = 0;
int allow_replace = 0;
int failed = 0;
int fd;
ARGBEGIN {
case 'r':
allow_replace = 1;
break;
default:
usage();
} ARGEND;
if (argc < 2 || argc > 3)
usage();
user = argv[0];
keyname = argv[1];
parameters = argv[2];
if (!user[0] || user[0] == '.' || strchr(user, '/') || strchr(user, '~')) {
fprintf(stderr, "%s: bad user name specified: %s\n", argv0, user);
failed = 1;
}
if (keyname[strcspn(keyname, " \t\f\n\r\v")]) {
fprintf(stderr, "%s: bad key name specified: %s, includes whitespace\n", argv0, keyname);
failed = 1;
}
if (isatty(STDIN_FILENO)) {
fprintf(stderr, "%s: standard input must not be a TTY.\n", argv0);
failed = 1;
}
if (failed)
return 1;
if (mlockall(MCL_CURRENT | MCL_FUTURE)) {
fprintf(stderr, "%s: mlockall MCL_CURRENT|MCL_FUTURE: %s\n", argv0, strerror(errno));
exit(1);
}
/* TODO hash input */
path = malloc(sizeof(KEYPATH"/") + strlen(user));
if (!path) {
fprintf(stderr, "%s: malloc: %s\n", argv0, strerror(errno));
exit(1);
}
path2 = malloc(sizeof(KEYPATH"/~") + strlen(user));
if (!path) {
fprintf(stderr, "%s: malloc: %s\n", argv0, strerror(errno));
exit(1);
}
stpcpy(stpcpy(path, KEYPATH"/"), user);
stpcpy(stpcpy(path2, path), "~");
fd = open(path, O_RDONLY);
if (fd < 0) {
if (errno != ENOENT) {
fprintf(stderr, "%s: open %s O_RDONLY: %s\n", argv0, path, strerror(errno));
exit(1);
}
beginning = end = 0;
} else {
loadandlocate(&beginning, &end, fd, &data, &data_len, &data_size, keyname, path);
if (close(fd)) {
fprintf(stderr, "%s: read %s: %s\n", argv0, path, strerror(errno));
exit(1);
}
if (beginning == end)
beginning = end = 0; /* make sure the new key is not concatenated onto a truncated line at the end */
}
if (!allow_replace && beginning != end) {
fprintf(stderr, "%s: key already exists: %s\n", argv0, keyname);
exit(1);
}
/* TODO add or replace key */
if (mkdir(KEYPATH, 0700) && errno != EEXIST) {
fprintf(stderr, "%s: mkdir %s: %s\n", argv0, KEYPATH, strerror(errno));
exit(1);
}
fd = open(path2, O_WRONLY | O_CREAT | O_EXCL, 0600);
if (fd < 0) {
fprintf(stderr, "%s: open %s O_WRONLY|O_CREAT|O_EXCL 0600: %s\n", argv0, path2, strerror(errno));
exit(1);
}
if (writeall(fd, data, data_len)) {
fprintf(stderr, "%s: write %s: %s\n", argv0, path2, strerror(errno));
close(fd);
goto saved_failed;
}
if (close(fd)) {
fprintf(stderr, "%s: write %s: %s\n", argv0, path2, strerror(errno));
goto saved_failed;
}
if (rename(path2, path)) {
fprintf(stderr, "%s: rename %s %s: %s\n", argv0, path2, path, strerror(errno));
saved_failed:
if (unlink(path2))
fprintf(stderr, "%s: unlink %s: %s\n", argv0, path2, strerror(errno));
exit(1);
}
free(path);
free(path2);
free(data);
return 0;
}
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