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/* Copyright (C) 2021 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>
#ifdef __FreeBSD__
#include <sys/capsicum.h>
#endif
static int compar(const void *_a, const void *_b) {
const struct dirent *a = _a;
const struct dirent *b = _b;
if (a->d_type != b->d_type) {
return (a->d_type > b->d_type) - (a->d_type < b->d_type);
}
return strcmp(a->d_name, b->d_name);
}
int main(int argc, char *argv[]) {
int error;
const char *host = NULL;
const char *port = "70";
for (int opt; 0 < (opt = getopt(argc, argv, "h:p:"));) {
switch (opt) {
break; case 'h': host = optarg;
break; case 'p': port = optarg;
break; default: return EX_USAGE;
}
}
if (optind == argc) return EX_USAGE;
if (!host) {
static char buf[256];
error = gethostname(buf, sizeof(buf));
if (error) abort();
host = buf;
}
const char *path = argv[optind];
int root = open(path, O_RDONLY | O_DIRECTORY);
if (root < 0) err(EX_NOINPUT, "/");
#ifdef __FreeBSD__
cap_rights_t cap;
error = cap_enter()
|| cap_rights_limit(STDIN_FILENO, cap_rights_init(&cap, CAP_READ))
|| cap_rights_limit(STDOUT_FILENO, cap_rights_init(&cap, CAP_WRITE))
|| cap_rights_limit(STDERR_FILENO, &cap)
|| cap_rights_limit(
root, cap_rights_init(&cap, CAP_PREAD, CAP_FSTATAT, CAP_FSTATFS)
);
if (error) abort();
#else
#warning "This is completely insecure without capsicum(4)!"
#endif
char buf[1024];
if (!fgets(buf, sizeof(buf), stdin)) return EX_PROTOCOL;
char *ptr = buf;
char *sel = strsep(&ptr, "\t\r\n");
if (sel[0] == '/') sel++;
int fd = (sel[0] ? openat(root, sel, O_RDONLY) : root);
if (fd < 0) err(EX_NOINPUT, "%s", sel);
struct stat stat;
error = fstat(fd, &stat);
if (error) err(EX_IOERR, "%s", sel);
if (!(stat.st_mode & (S_IFREG | S_IFDIR))) {
errx(EX_NOINPUT, "%s: Not a file or directory", sel);
}
if (stat.st_mode & S_IFREG) {
#ifdef __FreeBSD__
error = sendfile(fd, STDOUT_FILENO, 0, 0, NULL, NULL, 0);
if (!error) return EX_OK;
#endif
char buf[4096];
for (ssize_t len; 0 < (len = read(fd, buf, sizeof(buf)));) {
fwrite(buf, len, 1, stdout);
}
return EX_OK;
}
DIR *dir = fdopendir(fd);
if (!dir) err(EX_IOERR, "%s", sel);
size_t len = 0;
size_t width = 0;
static struct dirent ents[4096];
for (struct dirent *ent; len < 4096 && (ent = readdir(dir));) {
if (ent->d_name[0] == '.') continue;
if (ent->d_type != DT_REG && ent->d_type != DT_DIR) continue;
if (ent->d_namlen > width) width = ent->d_namlen;
ents[len++] = *ent;
}
qsort(ents, len, sizeof(ents[0]), compar);
for (size_t i = 0; i < len; ++i) {
char mtime[26] = "";
if (ents[i].d_type == DT_REG) {
error = fstatat(fd, ents[i].d_name, &stat, 0);
if (error) err(EX_IOERR, "%s/%s", sel, ents[i].d_name);
ctime_r(&stat.st_mtime, mtime);
mtime[24] = '\0';
}
printf(
"%c%-*s %s\t%s%s%s\t%s\t%s\r\n",
(ents[i].d_type == DT_DIR ? '1' : '0'),
(int)width, ents[i].d_name, mtime,
sel, (sel[0] ? "/" : ""), ents[i].d_name, host, port
);
}
printf("i-- \t\t%s\t%s\r\n", host, port);
printf("0Served by IGP (AGPLv3)\tigp.c\ttext.causal.agency\t70\r\n");
printf(".\r\n");
}
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