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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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Makefile
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NAME=zet
BIN=zet.dpi
DILLO_DIR=~/.dillo
DPI_DIR=$(DILLO_DIR)/dpi
SUNDOWN_SRC=$(wildcard sundown/*.c)
OBJ=dpi.o zet.dpi.o io.o $(SUNDOWN_SRC:c=o)
CFLAGS=-Wall -Wextra -pedantic
all-reload: all
pkill $(BIN)
all: $(BIN)
$(BIN): $(OBJ)
install: $(BIN) domainrc
mkdir -p $(DPI_DIR)/$(NAME)
cp -f $(BIN) $(DPI_DIR)/$(NAME)
link: $(BIN) domainrc
mkdir -p $(DPI_DIR)/$(NAME)
ln -frs $(BIN) $(DPI_DIR)/$(NAME)
domainrc: $(DILLO_DIR)/domainrc
@grep -q '^default accept$$' $< || \
echo 'Note: Set "default accept" in $< to enable redirects'
$(DILLO_DIR)/domainrc:
echo 'default accept' > $@
clean:
rm $(BIN) $(OBJ)
uninstall: $(BIN)
rm -f $(DPI_DIR)/$(NAME)/$(BIN)

51
README.md
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# dillo-zet
Zettelkasten application for [Dillo][].
## Install from [git-ssb][]
```
git clone ssb://%R1c3tDmS57iZ5G+g4UkLSWQehG/WUVLd1Y9XkTlng8Y=.sha256 dillo-zet
cd dillo-zet
make install
dpid stop
```
You can also use `make link` instead of `make install`, to install via a symlink.
Then visit <dpi:/zet/> in Dillo.
## Usage
- <dpi:/zet/> - Main page (list all notes)
- <dpi:/zet/ID> - View a note
- <dpi:/zet/new> - Draft a new note
Notes are identified by a string of hexadecimal characters, prefixed by a section sign ("§"). The section sign is not included in the `dpi:/zet/` URL.
The note format is Markdown as parsed by the [sundown][] library, with some changes, e.g. to linkify dillo-zet ids, and to make it a little more like SSB markdown.
Notes are stored as plain text files in a `~/.zet` directory.
## Screenshot
![dillo-zet-screenshot-invidious.png](&oLj9GQS8Acb1OJkzjBB/0GySl8/ZycZ0WGc9ptDFxFg=.sha256)
[Dillo]: https://www.dillo.org/
[git-ssb]: %n92DiQh7ietE+R+X/I403LQoyf2DtR3WQfCkDKlheQU=.sha256
[sundown]: https://github.com/vmg/sundown
## License
Copyright 2020 Charles E. Lehner
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/>.

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dpi.c
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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include "dpi.h"
#include "io.h"
int dpi_check_auth(int fd) {
char buf[30];
char key[4], local_key[4];
char keys[128];
char *home;
ssize_t sz;
int rc;
rc = read_all(fd, buf, 28);
if (rc < 0) return -1;
buf[29] = '\0';
// first byte was read already
rc = sscanf(buf, "cmd='auth' msg='%4x' '>", key);
if (rc < 1) { errno = EPROTO; return -1; }
home = getenv("HOME");
if (!home) home = ".";
sz = read_file(keys, sizeof(keys), "%s/.dillo/dpid_comm_keys", home);
if (sz < 0) { errno = ENOKEY; return -1; }
rc = sscanf(keys, "%*d %4x", local_key);
if (rc < 1) { errno = ENOKEY; return -1; }
if (memcmp(key, local_key, 4)) { errno = EKEYREJECTED; return -1; }
return 0;
}
int dpi_read_request(int fd, char *url_buf, size_t url_len) {
char buf[21];
size_t len;
int rc;
int i;
rc = read_all(fd, buf, sizeof(buf));
if (rc < 0 && errno == EPIPE && !strncmp(buf, "<cmd='DpiBye' '>", 16)) {
errno = ESHUTDOWN;
return -1;
}
if (rc < 0) return -1;
if (strncmp(buf, "<cmd='open_url' url='", 21)) {
errno = EPROTO;
return -1;
}
len = url_len;
rc = read_some(fd, url_buf, &len);
if (rc < 0) return -1;
for (i = 0; i < len-1; i++) {
if (url_buf[i] == '\'' && url_buf[i+1] == ' ') break;
}
if (i > len-3 || strncmp(url_buf + i, "' '>", 4)) {
errno = EPROTO;
return -1;
}
url_buf[i] = '\0';
return 0;
}
int dpi_send_status(int fd, const char *status) {
return dprintf(fd, "<cmd='send_status_message' msg='%s' '>", status);
}
int dpi_send_header(int fd, const char *content_type) {
return dprintf(fd, "<cmd='start_send_page' url='' '>"
"Content-Type: %s\n\n", content_type);
}
int dpi_reload(int fd) {
return dprintf(fd, "<cmd='reload_request' url='' '>");
}

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dpi.h
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#pragma once
#include <stddef.h>
int dpi_check_auth(int fd);
int dpi_read_request(int fd, char *url_buf, size_t url_len);
int dpi_send_status(int fd, const char *status);
int dpi_send_header(int fd, const char *content_type);
int dpi_reload(int fd);

112
io.c
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#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include "io.h"
int read_all(int fd, unsigned char *buf, size_t len) {
ssize_t nbytes;
while (len > 0) {
nbytes = read(fd, buf, len);
if (nbytes == 0) { errno = EPIPE; return -1; }
if (nbytes < 0 && errno == EINTR) continue;
if (nbytes < 0) return -1;
buf += nbytes;
len -= nbytes;
}
return 0;
}
int read_some(int fd, unsigned char *buf, size_t *lenp) {
ssize_t nbytes;
do nbytes = read(fd, buf, *lenp);
while (nbytes < 0 && errno == EINTR);
if (nbytes == 0) { errno = EPIPE; return -1; }
if (nbytes < 0) return -1;
*lenp = nbytes;
return 0;
}
int read_char(int fd) {
ssize_t nbytes;
char buf[1];
do nbytes = read(fd, buf, 1);
while (nbytes < 0 && errno == EINTR);
if (nbytes < 0) return -1;
if (nbytes == 0) { errno = EPIPE; return -1; }
return buf[0];
}
int write_all(int fd, const unsigned char *buf, size_t count) {
ssize_t nbytes;
while (count > 0) {
nbytes = write(fd, buf, count);
if (nbytes < 0 && errno == EINTR) continue;
if (nbytes < 0) return -1;
buf += nbytes;
count -= nbytes;
}
return 0;
}
int write_char(int fd, char c) {
ssize_t nbytes;
char buf[1] = {c};
do nbytes = write(fd, buf, 1);
while (nbytes < 0 && errno == EINTR);
if (nbytes < 0) return -1;
if (nbytes == 0) { errno = EPIPE; return -1; }
return 0;
}
ssize_t read_file(char *buf, size_t len, const char *fmt, ...) {
va_list ap;
int rc;
struct stat st;
int fd;
va_start(ap, fmt);
rc = vsnprintf(buf, len, fmt, ap);
va_end(ap);
if (rc < 0) return -1;
if ((size_t)rc >= len) { errno = ENAMETOOLONG; return -1; }
rc = stat(buf, &st);
if (rc < 0) return -1;
if ((size_t)st.st_size > len-1) { errno = EMSGSIZE; return -1; }
fd = open(buf, O_RDONLY);
if (fd < 0) return -1;
rc = read_all(fd, (unsigned char *)buf, st.st_size);
if (rc < 0) return -1;
buf[(size_t)st.st_size] = '\0';
close(fd);
return st.st_size;
}
char *read_full(int fd) {
int rc;
struct stat st;
rc = fstat(fd, &st);
if (rc < 0) return NULL;
char *buf = malloc(st.st_size + 1);
if (buf == NULL) return NULL;
rc = read_all(fd, (unsigned char *)buf, st.st_size);
if (rc < 0) return NULL;
buf[(size_t)st.st_size] = '\0';
close(fd);
return buf;
}

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io.h
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#pragma once
#include <stddef.h>
#define write_buf(fd, buf) \
write_all(fd, (unsigned const char *)buf, sizeof(buf)-1)
int read_all(int fd, unsigned char *buf, size_t count);
int read_some(int fd, unsigned char *buf, size_t *lenp);
int read_char(int fd);
ssize_t read_file(char *buf, size_t len, const char *fmt, ...);
int write_all(int fd, unsigned const char *buf, size_t count);
int write_char(int fd, char c);
char *read_full(int fd);

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zet.dpi.c
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#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "dpi.h"
#include "io.h"
#include "sundown/markdown.h"
#include "sundown/html.h"
#include "sundown/buffer.h"
#include "sundown/houdini.h"
#define NAV_ALL "<a href=\".\">All</a>"
#define NAV_NEW "<a href=\"new\">New</a>"
#define STRONG(html) "<strong>" html "</strong>"
#define TOPBAR_NAV NAV_ALL " " NAV_NEW " "
#define TOPBAR_NAV_ALL STRONG(NAV_ALL) " " NAV_NEW " "
#define TOPBAR_NAV_NEW NAV_ALL " " STRONG(NAV_NEW) " "
static const size_t sigil_size = sizeof("§")-1;
static const int id_length = 16;
static const int max_cols = 40;
static char server_hostname[256];
static char server_url[256];
static char zet_dir[_POSIX_PATH_MAX-64];
struct http_request {
char *method;
char *path;
char *query;
char *hash;
char *http_version;
char *host;
char *referer;
ssize_t content_length;
char *content_type;
char *multipart_boundary;
int fd;
char *data, *full_data;
size_t len;
};
struct zet_search {
DIR *dir;
char *id;
};
static int count_lines_in(const char *str) {
int count = 0;
char c;
int col = 0;
while ((c = *str++)) {
if (c == '\n' || col++ > max_cols) {
count++;
col = 0;
}
}
return count;
}
static int count_lines(int fd) {
int count = 0;
do {
unsigned char buf[4096];
size_t len = sizeof(buf)-1;
int rc = read_some(fd, buf, &len);
if (rc < 0) {
if (errno == EPIPE) break;
return -1;
}
buf[len] = '\0';
count += count_lines_in((char *)buf);
} while (1);
return count;
}
static int write_html_char(int fd, char c) {
switch (c) {
case '&': return write_buf(fd, "&amp;");
case '<': return write_buf(fd, "&lt;");
case '>': return write_buf(fd, "&gt;");
case '"': return write_buf(fd, "&quot;");
}
return write_char(fd, c);
}
static int write_html(int fd, const char *buf, size_t len) {
while (len > 0) {
// note: buf must null-terminated
char *next = strpbrk(buf, "&<>\"");
if (next == NULL) return write_all(fd, (unsigned char *)buf, len);
char c = *next;
size_t sublen = next - buf;
int rc = write_all(fd, (unsigned char *)buf, sublen);
if (rc < 0) return -1;
buf += sublen + 1;
len -= sublen + 1;
rc = write_html_char(fd, c);
if (rc < 0) return -1;
}
return 0;
}
static int passthrough_note_html(int fd, int note_fd) {
int rc;
do {
unsigned char buf[4096];
size_t len = sizeof(buf)-1;
rc = read_some(note_fd, buf, &len);
if (rc < 0) {
if (errno != EPIPE) dprintf(fd,
"\n<strong>Error</strong>: %s", strerror(errno));
break;
}
buf[len] = '\0';
rc = write_html(fd, (char *)buf, len);
if (rc < 0) warn("write_html");
} while (rc == 0);
return 0;
}
static int dpi_respond_err(int fd, const char *fmt, ...) {
int rc;
va_list ap;
int err = errno;
va_start(ap, fmt);
rc = dpi_send_header(fd, "text/plain");
rc |= vdprintf(fd, fmt, ap);
rc |= dprintf(fd, ": %s", strerror(err));
va_end(ap);
rc |= close(fd);
return rc;
}
static char *zet_get_title(const char *id, char *buf, size_t len) {
char path_buf[_POSIX_PATH_MAX];
ssize_t sz = snprintf(path_buf, sizeof(path_buf), "%s/%s", zet_dir, id);
if (sz < 0 || (size_t)sz >= sizeof(path_buf)) return NULL;
int fd = open(path_buf, O_RDONLY);
if (fd < 0) return NULL;
int rc = read_some(fd, (unsigned char *)buf, &len);
if (rc < 0) { close(fd); return NULL; }
buf[len] = '\0';
char *end = strchr(buf, '\n');
if (end != NULL) *end = '\0';
close(fd);
while (*buf == '#') buf++;
while (*buf == ' ') buf++;
return buf;
}
static char *zet_get_buf_title(const struct buf *link, char *buf, size_t len) {
char id_buf[128];
strncpy(id_buf, link->data, link->size);
id_buf[sizeof(id_buf)-1] = '\0';
return zet_get_title(id_buf + sigil_size, buf, len);
}
static int zet_links_in(const char *str, const char *id_to) {
while (1) {
str = strstr(str, "§");
if (str == NULL) return 0;
str += sigil_size;
if (!strncmp(str, id_to, id_length)) return 1;
}
return 0;
}
static int zet_links_to(const char *id_from, const char *id_to) {
// TODO: index links, so that every source file doesn't have to be read all
// the time
int rc;
char path_buf[_POSIX_PATH_MAX];
ssize_t sz = snprintf(path_buf, sizeof(path_buf), "%s/%s", zet_dir, id_from);
if (sz < 0 || (size_t)sz >= sizeof(path_buf)) return -1;
int fd = open(path_buf, O_RDONLY);
if (fd < 0) return -1;
size_t fringe = 0;
size_t link_len = strlen(id_to) + id_length;
unsigned char buf[4096];
do {
size_t len = sizeof(buf)-fringe-1;
rc = read_some(fd, buf + fringe, &len);
if (rc < 0) {
if (errno != EPIPE) { close(fd); return -1; }
close(fd);
return 0;
}
buf[len - fringe] = '\0';
rc = zet_links_in((char *)buf, id_to);
if (rc < 0) { close(fd); return -1; }
// in case a link is across the boundary between this buf and the next,
// keep some "fringe" of the end of this buf in the beginning of the
// next one
if (len > link_len) {
fringe = link_len;
memcpy(buf, buf + len - fringe, fringe);
}
} while (rc == 0);
close(fd);
return rc;
}
static int zet_search_start(struct zet_search *zs, char *id) {
zs->dir = opendir(zet_dir);
if (zs->dir == NULL) return -1;
zs->id = id;
return 0;
}
static int zet_search_next(struct zet_search *zs, const char **idp) {
int rc;
struct dirent *ent;
const char *id;
char *const dest_id = zs->id;
while (1) {
errno = 0;
ent = readdir(zs->dir);
if (ent == NULL) {
if (errno != 0) return -1;
id = NULL;
break;
}
id = ent->d_name;
if (id[0] == '.') continue;
if (strpbrk(id, "<>&\"~") != NULL) continue;
if (dest_id != NULL) {
rc = zet_links_to(id, zs->id);
if (rc < 0) return -1;
if (rc != 1) continue;
}
break;
};
*idp = id;
return 0;
}
static int zet_search_close(struct zet_search *sz) {
return closedir(sz->dir);
}
static int dpi_serve_zet_index(int fd) {
int rc;
struct zet_search zs;
rc = zet_search_start(&zs, NULL);
if (rc < 0) return dpi_respond_err(fd, "Unable to list");
rc = dpi_send_header(fd, "text/html");
if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
rc = dprintf(fd,
"<!doctype html><html><head>"
"<title>Notes</title>"
"<meta charset=utf-8>"
"</head>"
"<body>"
"<div>" TOPBAR_NAV_ALL "</div>"
"<ul>"
);
const char *id;
while (1) {
rc = zet_search_next(&zs, &id);
if (rc < 0) {
rc = dprintf(fd,
"\n<strong>Error</strong>: %s\n",
strerror(errno));
if (rc < 0) warnx("dprintf");
close(fd);
return 0;
}
if (id == NULL) break;
char title_buf[128];
char *title = zet_get_title(id, title_buf, sizeof(title_buf));
if (title == NULL) {
warn("zet_get_title");
title = title_buf;
strncpy(title, id, sizeof(title)-1);
title[sizeof(title)-1] = '\0';
return 0;
}
rc = dprintf(fd, "<li><a href=\"%s\">", id);
rc |= write_html(fd, title, strlen(title));
rc |= write_buf(fd, "</a></li>");
if (rc < 0) { warnx("dprintf/write_html/write_buf"); close(fd); return 0; }
}
rc = dprintf(fd, "</ul></body></html>");
if (rc < 0) { warn("dprintf"); close(fd); return 0; }
rc = zet_search_close(&zs);
if (rc < 0) warn("closedir");
close(fd);
return 0;
}
static int dpi_serve_not_found(int fd) {
int rc = dpi_send_header(fd, "text/html");
if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
write_buf(fd, "Not Found");
close(fd);
return 0;
}
static int dpi_serve_zet_new(int fd) {
int rc = dpi_send_header(fd, "text/html");
if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
dprintf(fd,
"<!doctype html><html><head>"
"<title>New Note</title>"
"<meta charset=utf-8>"
"</head>"
"<body>"
"<div>" TOPBAR_NAV_NEW "</div>"
"<form method=post action=\"%snew\" enctype=\"multipart/form-data\">"
"<textarea name=text cols=64 style=\"width:50%%;height:80%%\"></textarea><br>"
"<input type=submit value=\"Save\">"
"</form></html>"
, server_url);
close(fd);
return 0;
}
static void parse_req_uri(char *path, char **hashp, char **queryp) {
char *hash = *hashp = strchr(path, '#');
if (hash != NULL) *hash++ = '\0';
char *query = *queryp = strchr(path, '?');
if (query != NULL) *query++ = '\0';
}
static int
md_rndr_link(struct buf *ob, const struct buf *link, const struct buf *title, const struct buf *content, void *opaque)
{
struct html_renderopt *options = opaque;
if (link != NULL && (options->flags & HTML_SAFELINK) != 0 && !sd_autolink_issafe(link->data, link->size))
return 0;
BUFPUTSL(ob, "<a href=\"");
if (link && link->size > sigil_size) {
if (!strncmp((char *)link->data, "§", sigil_size))
houdini_escape_href(ob, link->data + sigil_size,
link->size - sigil_size);
else
houdini_escape_href(ob, link->data, link->size);
}
if (title && title->size) {
BUFPUTSL(ob, "\" title=\"");
houdini_escape_html0(ob, title->data, title->size, 0);
}
if (options->link_attributes) {
bufputc(ob, '\"');
options->link_attributes(ob, link, opaque);
bufputc(ob, '>');
} else {
BUFPUTSL(ob, "\">");
}
if (content && content->size) bufput(ob, content->data, content->size);
BUFPUTSL(ob, "</a>");
return 1;
}
static void put_link_truncated(struct buf *ob, const struct buf *link) {
if (link->size < max_cols) {
return houdini_escape_html0(ob, link->data, link->size, 0);
}
houdini_escape_html0(ob, link->data, max_cols, 0);
BUFPUTSL(ob, "…");
}
static int
md_rndr_autolink(struct buf *ob, const struct buf *link, enum mkd_autolink type, void *opaque)
{
struct html_renderopt *options = opaque;
if (!link || !link->size)
return 0;
if ((options->flags & HTML_SAFELINK) != 0 &&
!sd_autolink_issafe(link->data, link->size) &&
type != MKDA_EMAIL)
return 0;
BUFPUTSL(ob, "<a href=\"");
if (type == MKDA_EMAIL)
BUFPUTSL(ob, "mailto:");
if (type == MKDA_ZET)
houdini_escape_href(ob, link->data + sigil_size, link->size - sigil_size);
else
houdini_escape_href(ob, link->data, link->size);
if (type == MKDA_ZET) {
char title_buf[128];
char *title = zet_get_buf_title(link, title_buf, sizeof(title_buf));
if (title != NULL) {
BUFPUTSL(ob, "\" title=\"");
houdini_escape_html0(ob, title, strlen(title), 0);
}
}
if (options->link_attributes) {
bufputc(ob, '\"');
options->link_attributes(ob, link, opaque);
bufputc(ob, '>');
} else {
BUFPUTSL(ob, "\">");
}
/*
* Pretty printing: if we get an email address as
* an actual URI, e.g. `mailto:foo@bar.com`, we don't
* want to print the `mailto:` prefix
*/
if (bufprefix(link, "mailto:") == 0) {
houdini_escape_html0(ob, link->data + 7, link->size - 7, 0);
} else {
put_link_truncated(ob, link);
}
BUFPUTSL(ob, "</a>");
return 1;
}
static int dpi_serve_zet(int fd, char *path) {
int rc;
char *hash, *query;
parse_req_uri(path, &hash, &query);
if (!strcmp(path, "/")) return dpi_serve_zet_index(fd);
if (!strcmp(path, "/new")) return dpi_serve_zet_new(fd);
char path_buf[_POSIX_PATH_MAX];
char *id = path+1;
ssize_t sz = snprintf(path_buf, sizeof(path_buf), "%s/%s", zet_dir, id);
if (sz < 0 || (size_t)sz >= sizeof(path_buf)) return dpi_respond_err(fd, "read_file");
int note_fd = open(path_buf, O_RDONLY);
if (note_fd < 0 && errno == ENOENT) return dpi_serve_not_found(fd);
if (note_fd < 0) return dpi_respond_err(fd, "open");
int rows = count_lines(note_fd);
if (rows < 0) return dpi_respond_err(fd, "count_lines");
static const int max_rows = 57, min_rows = 8;
if (rows > max_rows) rows = max_rows;
else if (rows < min_rows) rows = min_rows;
rc = lseek(note_fd, 0, SEEK_SET);
if (rc < 0) return dpi_respond_err(fd, "lseek");
rc = dpi_send_header(fd, "text/html");
rc |= dprintf(fd,
"<!doctype html><head>"
"<title>§%s</title>"
"<meta charset=utf-8>"
"</head><body>"
"<div>" TOPBAR_NAV " <strong><code><a href=\"%s\">§%s</a></code></strong></div>"
"<table style=\"width:100%%; height:100%%\"><tr>"
"<td style=\"width:50%%\"><form method=post action=\"%s%s\" enctype=\"multipart/form-data\" style=\"height:100%%\">"
"<textarea name=text cols=64 rows=%d style=\"width:100%%\">"
, id, id, id, server_url, id, rows);
rc = passthrough_note_html(fd, note_fd);
if (rc < 0) { warnx("passthrough_note_html"); close(fd); return 0; }
rc = dprintf(fd, "</textarea><br>"
"<input type=submit value=\"Save\">"
"</form></td>"
"<style>pre { white-space: pre-wrap; }</style>"
"<td>"
);
if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
rc = lseek(note_fd, 0, SEEK_SET);
if (rc < 0) {
rc = dprintf(fd, "\n<strong>Error</strong>: %s", strerror(errno));
if (rc < 0) warnx("dprintf");
close(fd);
}
char *text = read_full(note_fd);
if (text == NULL) {
rc = dprintf(fd, "\n<strong>Error</strong>: %s", strerror(errno));
if (rc < 0) warnx("dprintf");
close(fd);
}
struct sd_callbacks callbacks;
struct html_renderopt options;
struct sd_markdown *markdown;
struct buf *ob = bufnew(128);
sdhtml_renderer(&callbacks, &options, HTML_ESCAPE);
callbacks.link = md_rndr_link;
callbacks.autolink = md_rndr_autolink;
static const unsigned int extensions =
MKDEXT_NO_INTRA_EMPHASIS |
MKDEXT_TABLES |
MKDEXT_FENCED_CODE |
MKDEXT_AUTOLINK |
MKDEXT_STRIKETHROUGH |
MKDEXT_SPACE_HEADERS |
MKDEXT_LAX_SPACING;
markdown = sd_markdown_new(extensions, 16, &callbacks, &options);
sd_markdown_render(ob, (unsigned char *)text, strlen(text), markdown);
free(text);
sd_markdown_free(markdown);
rc = write_all(fd, ob->data, ob->size);
if (rc < 0) warn("write_all");
bufrelease(ob);
rc = dprintf(fd, "</td></tr>");
if (rc < 0) warn("dprintf");
rc = dprintf(fd, "<tr><td></td><td>");
if (rc < 0) warn("dprintf");
struct zet_search zs;
bool first = true;
rc = zet_search_start(&zs, id);
if (rc < 0) warn("zet_search_start");
do {
const char *result_id;
rc = zet_search_next(&zs, &result_id);
if (rc < 0) warn("zet_search_next");
if (result_id == NULL) break;
if (first) {
first = false;
rc = dprintf(fd, "Backlinks:<ul>");
if (rc < 0) warn("dprintf");
}
char title_buf[128];
char *result_title = zet_get_title(result_id, title_buf, sizeof(title_buf));
if (result_title == NULL) {
warn("zet_get_title");
result_title = title_buf;
strncpy(result_title, result_id, sizeof(result_title)-1);
result_title[sizeof(result_title)-1] = '\0';
return 0;
}
rc = dprintf(fd, "<li><a href=\"%s\">", result_id);
rc |= write_html(fd, result_title, strlen(result_title));
rc |= write_buf(fd, "</a></li>");
} while (1);
if (!first) (void)dprintf(fd, "</ul>");
rc = dprintf(fd, "</td></tr>");
if (rc < 0) warn("dprintf");
(void)zet_search_close(&zs);
rc = dprintf(fd, "</table></body></html>");
if (rc < 0) warn("dprintf");
close(fd);
return 0;
}
static int handle_dpi_client(int fd) {
int rc;
char url[2048];
rc = dpi_check_auth(fd);
if (rc < 0) {
warn("dpi auth");
close(fd);
return 0;
}
rc = dpi_read_request(fd, url, sizeof(url));
if (rc < 0) {
if (errno == ESHUTDOWN) return -1;
warn("dpi request");
dpi_respond_err(fd, "Unable to read request");
return 0;
}
if (!strncmp(url, "dpi:/zet/", 9)) {
return dpi_serve_zet(fd, url + 8);
}
return dpi_serve_not_found(fd);
}
static char *next_line(char *str) {
char *nextline = strchr(str, '\n');
if (nextline != NULL) {
if (nextline[-1] == '\r') nextline[-1] = '\0';
else *nextline = '\0';
nextline++;
}
return nextline;
}
static int http_serve_index(struct http_request *req) {
write_buf(req->fd, "HTTP/1.0 200 OK\r\nConnection: close\r\n\r\n");
close(req->fd);
return 0;
}
static int save_part(struct http_request *req, int note_fd) {
int rc = write_all(note_fd, (unsigned char *)req->data, req->len);
rc |= close(note_fd);
free(req->full_data);
return rc;
}
static int parse_multipart(struct http_request *req) {
size_t boundary_len = req->multipart_boundary != NULL
? strlen(req->multipart_boundary) : 0;
if (boundary_len == 0) return -1;
ssize_t len = req->content_length;
if (len < 0) return -1;
if (req->len < (size_t)len) {
req->full_data = malloc(len+1);
memcpy(req->full_data, req->data, req->len);
char *rest = req->full_data + req->len;
int rc = read_all(req->fd, (unsigned char *)rest, len - req->len);
if (rc < 0) return -1;
req->data = req->full_data;
req->len = len;
}
req->data[req->len] = '\0';
char *boundary_start = NULL;
while (req->len > 0) {
boundary_start = strstr(req->data, req->multipart_boundary);
if (boundary_start == NULL) return -1;
boundary_start += boundary_len;
char *line = boundary_start;
char *cdisp = NULL;
bool is_text = false;
if (*line == '\r') line++;
if (*line == '\n') line++;
char *nextline;
while (line != NULL) {
nextline = next_line(line);
if (!line[0]) break;
char *name = line;
char *value = strchr(line, ':');
if (value != NULL) {
*value++ = '\0';
while (*value == ' ') value++;
}
if (!strncmp(name, "Content-Disposition", 3)) cdisp = value;
line = nextline;
}
if (cdisp != NULL && !strcmp(cdisp, "form-data; name=\"text\"")) {
is_text = true;
}
req->len -= nextline - req->data;
req->data = nextline;
char *end = strstr(nextline, req->multipart_boundary);
if (end == NULL || strncmp(end + boundary_len, "--", 2)) return -1;
if (end[-1] == '\n') end--;
if (end[-1] == '\r') end--;
*end = '\0';
req->len = end - nextline;
if (is_text) break;
}
return 0;
}
static int http_serve_new(struct http_request *req) {
int rc;
char note_path[_POSIX_PATH_MAX];
char id[64];
rc = parse_multipart(req);
if (rc < 0) {
write_buf(req->fd, "HTTP/1.0 400 Bad Request\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Unable to parse form submission");
close(req->fd);
return 0;
}
(void)mkdir(zet_dir, 0700);
srandom(time(NULL) ^ getpid());
(void)snprintf(id, sizeof(id), "%08lx%08lx", random(), random());
(void)snprintf(note_path, sizeof(note_path), "%s/%s", zet_dir, id);
int note_fd = open(note_path, O_CREAT|O_WRONLY|O_TRUNC, 0640);
if (note_fd < 0) {
dprintf(req->fd, "HTTP/1.0 500 Internal Server Error\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Unable to open file: %s\n", strerror(errno));
close(req->fd);
return 0;
}
rc = save_part(req, note_fd);
if (rc < 0) {
dprintf(req->fd, "HTTP/1.0 200 OK\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Error saving: %s", strerror(errno));
close(req->fd);
return 0;
}
dprintf(req->fd, "HTTP/1.0 302 Found\r\n"
"Content-Type: text/html\r\n"
"Location: dpi:/zet/%s\r\n"
"Connection: close\r\n\r\n"
"<!doctype html><head>"
"<title>Created: §%s</title>"
"<meta charset=utf-8>"
"</head><body>"
"Created: <a href=\"dpi:/zet/%s\">§%s</a>"
"</body></html>"
, id, id, id, id);
close(req->fd);
return 0;
}
static int http_serve_not_found(struct http_request *req) {
dprintf(req->fd, "HTTP/1.0 200 OK\r\n"
"Connection: close\r\n\r\n"
"Not found\n");
close(req->fd);
return 0;
}
static int http_serve_zet(struct http_request *req) {
int rc;
char note_path[_POSIX_PATH_MAX];
char note_path_backup[_POSIX_PATH_MAX];
char *id = req->path + 1;
rc = parse_multipart(req);
if (rc < 0) {
write_buf(req->fd, "HTTP/1.0 400 Bad Request\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Unable to parse form submission");
close(req->fd);
return 0;
}
(void)snprintf(note_path, sizeof(note_path), "%s/%s", zet_dir, id);
(void)snprintf(note_path_backup, sizeof(note_path_backup), "%s/%s~", zet_dir, id);
rc = rename(note_path, note_path_backup);
if (rc < 0 && errno != ENOENT) warn("rename");
int note_fd = open(note_path, O_CREAT|O_WRONLY|O_TRUNC, 0640);
if (note_fd < 0) {
if (errno == ENOENT) return http_serve_not_found(req);
dprintf(req->fd, "HTTP/1.0 500 Internal Server Error\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Unable to open file: %s\n", strerror(errno));
close(req->fd);
return 0;
}
rc = save_part(req, note_fd);
if (rc < 0) {
dprintf(req->fd, "HTTP/1.0 200 OK\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Error saving: %s", strerror(errno));
close(req->fd);
return 0;
}
dprintf(req->fd, "HTTP/1.0 302 Found\r\n"
"Content-Type: text/html\r\n"
"Location: dpi:/zet/%s\r\n"
"Connection: close\r\n\r\n"
"<!doctype html><head>"
"<title>Saved: §%s</title>"
"<meta charset=utf-8>"
"</head><body>"
"Saved: <a href=\"dpi:/zet/%s\">§%s</a>"
"</body></html>"
, id, id, id, id);
close(req->fd);
return 0;
}
static int handle_http_client(int fd, int firstchar) {
int rc;
struct http_request req;
char buf[2048];
buf[0] = firstchar;
size_t len = sizeof(buf)-1;
rc = read_some(fd, (unsigned char *)buf+1, &len);
buf[len+1] = '\0';
len++;
if (rc < 0) { close(fd); return 0; }
char *nextline = next_line(buf);
req.method = buf;
req.path = strchr(buf, ' ');
if (req.path == NULL) { close(fd); return 0; }
*req.path++ = '\0';
req.http_version = strchr(req.path, ' ');
if (req.http_version != NULL) *req.http_version++ = '\0';
req.referer = NULL;
req.host = NULL;
req.content_length = -1;
req.content_type = NULL;
req.multipart_boundary = NULL;
char *line = nextline;
while (line != NULL) {
nextline = next_line(line);
if (!line[0]) break;
char *name = line;
char *value = strchr(line, ':');
if (value != NULL) {
*value++ = '\0';
while (*value == ' ') value++;
}
if (!strncmp(name, "Host", 3)) req.host = value;
else if (!strncmp(name, "Referer", 7)) req.referer = value;
else if (!strncmp(name, "Content-Length", 14)) req.content_length = atoi(value);
else if (!strncmp(name, "Content-Type", 14)) req.content_type = value;
// else fprintf(stderr, "%s = %s\n", name, value);
line = nextline;
}
if (req.content_type != NULL
&& !strncmp(req.content_type, "multipart/", 10)) {
char *subtype = req.content_type + 10;
char *boundary = strstr(subtype, "; boundary=");
if (boundary != NULL) {
*boundary = '\0';
boundary += 11;
if (boundary[0] == '"') {
boundary++;
char *end = strchr(boundary, '"');
if (end != NULL) *end = '\0';
}
*--boundary = '-';
*--boundary = '-';
req.multipart_boundary = boundary;
}
}
if (req.referer == NULL || strncmp(req.referer, server_url, strlen(server_url))) {
dprintf(fd, "HTTP/1.0 403 Forbidden\r\n"
"Connection: close\r\n\r\n"
"Invalid Referer\n");
close(fd);
return 0;
}
if (req.host != NULL && strcmp(req.host, server_hostname)) {
dprintf(fd, "HTTP/1.0 403 Forbidden\r\n"
"Connection: close\r\n\r\n"
"Invalid Host\n");
close(fd);
return 0;
}
ptrdiff_t offset = nextline - buf;
req.data = nextline;
req.full_data = NULL;
req.len = len - offset;
req.fd = fd;
parse_req_uri(req.path, &req.hash, &req.query);
if (!strcmp(req.path, "/")) return http_serve_index(&req);
if (!strcmp(req.path, "/new")) return http_serve_new(&req);
return http_serve_zet(&req);
}
static int handle_client(int server_fd) {
int fd;
do {
fd = accept(server_fd, NULL, NULL);
if (fd < 0 && errno != ENETDOWN && errno != EPROTO
&& errno != ENOPROTOOPT && errno != EHOSTDOWN
&& errno != ENONET && errno != EHOSTUNREACH
&& errno != EOPNOTSUPP && errno != ENETUNREACH
) return -1;
} while (fd < 0);
int firstchar = read_char(fd);
if (firstchar < 0) {
// ignore errno
close(fd);
return 0;
}
if (firstchar == '<') return handle_dpi_client(fd);
return handle_http_client(fd, firstchar);
}
void get_server_address() {
struct sockaddr_storage addr;
struct sockaddr *addrp = (struct sockaddr *)&addr;
socklen_t addr_len = sizeof(addr);
char host_buf[128];
const char *host;
unsigned short port;
int rc = getsockname(STDIN_FILENO, addrp, &addr_len);
if (rc < 0) err(1, "getsockname");
if (addr.ss_family == AF_INET) {
struct sockaddr_in *addr_in = (struct sockaddr_in *)&addr;
port = ntohs(addr_in->sin_port);
host = inet_ntop(AF_INET, &addr_in->sin_addr, host_buf, sizeof(host_buf));
} else if (addr.ss_family == AF_INET6) {
struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)&addr;
port = ntohs(addr_in6->sin6_port);
host = inet_ntop(AF_INET6, &addr_in6->sin6_addr, host_buf, sizeof(host_buf));
} else {
errx(1, "Unknown server address family: %d", addr.ss_family);
}
int wrote = snprintf(server_hostname, sizeof(server_hostname), "%s:%hu", host, port);
if (wrote <= 0 || wrote >= (int)sizeof(server_hostname)) {
errx(1, "Unable to write hostname");
}
wrote = snprintf(server_url, sizeof(server_url), "http://%s/", server_hostname);
if (wrote <= 0 || wrote >= (int)sizeof(server_url)) {
errx(1, "Unable to write local URL");
}
}
int main(int argc, char *argv[]) {
(void)argc;
(void)argv;
warnx("started");
const char *home = getenv("HOME");
int len = snprintf(zet_dir, sizeof(zet_dir), "%s/.zet", home);
if (len < 0 || len >= (int)sizeof(zet_dir)) {
err(1, "unable to build directory name");
}
// Since dpi requests don't support a request body, we POST via HTTP
// to our dpi server socket which is already listing on a local TCP port.
get_server_address();
// handle connections one at a time
while (handle_client(STDIN_FILENO) == 0);
warnx("exiting");
}
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