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messaged.c
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messaged.c
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/*
* Copyright (c) 2014-2015 Jan Klemkow <j.klemkow@wemelug.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef USE_LIBBSD
# include <bsd/string.h>
#else
# include <string.h>
#endif
#include <time.h>
#include <unistd.h>
#include <mxml.h>
#include "bxml/bxml.h"
struct contact {
char *name;
char in_path[PATH_MAX];
int fd; /* fd to fifo for input */
int out; /* fd to output text file */
LIST_ENTRY(contact) next;
};
struct context {
int fd_in;
char *out_file;
struct bxml_ctx *bxml;
char *jid;
char *id;
char *dir;
LIST_HEAD(listhead, contact) roster;
};
#define NULL_CONTEXT { \
STDIN_FILENO, \
NULL, \
NULL, \
NULL, \
NULL, \
".", \
LIST_HEAD_INITIALIZER() \
}
struct context *global_ctx;
void
free_contact(struct contact *c)
{
if (c == NULL) return;
if (c->fd != -1) close(c->fd);
if (c->out != -1) close(c->out);
free(c->name);
free(c);
}
static struct contact *
add_contact(struct context *ctx, const char *jid)
{
char path[PATH_MAX];
char *slash = NULL;
struct contact *c = NULL;
if ((c = calloc(1, sizeof *c)) == NULL) goto err;
c->out = c->fd = -1; /* to detect a none vaild file descriptor */
if ((c->name = strdup(jid)) == NULL) goto err;
/* just handle the bare jabber id without resources */
if ((slash = strchr(c->name, '/')) != NULL)
*slash = '\0';
/* prepare the folder */
if (snprintf(path, sizeof path, "%s/%s", ctx->dir, c->name) == 0)
goto err;
if (mkdir(path, S_IRWXU) == -1 && errno != EEXIST) goto err;
/* prepare and open the "in" file */
if (snprintf(c->in_path, sizeof c->in_path, "%s/%s/in",
ctx->dir, c->name) == 0)
goto err;
if (mkfifo(c->in_path, S_IRUSR|S_IWUSR) == -1 && errno != EEXIST)
goto err;
if ((c->fd = open(c->in_path, O_RDONLY|O_NONBLOCK, 0)) == -1) goto err;
/* prepare and open the "out" file */
if (snprintf(path, sizeof path, "%s/%s/out", ctx->dir, c->name) == 0)
goto err;
if ((c->out = open(path, O_WRONLY|O_APPEND|O_CREAT, S_IRUSR|S_IWUSR))
== -1) goto err;
LIST_INSERT_HEAD(&ctx->roster, c, next);
errno = 0;
return c;
err:
free_contact(c);
if (errno != 0)
perror(__func__);
return NULL;
}
static char *
prepare_prompt(char *prompt, size_t size, const char *user)
{
time_t timestamp = time(NULL);
if (prompt == NULL || size == 0)
return NULL;
/* prepare prompt "YYYY-MM-DD HH:MM <FROM> " */
strftime(prompt, size, "%F %R <", localtime(×tamp));
strlcat(prompt, user, size);
strlcat(prompt, "> ", size);
return prompt;
}
static void
msg_send(struct context *ctx, const char *msg, const char *to)
{
FILE *fh = NULL;
if ((fh = fopen(ctx->out_file, "w")) == NULL) goto err;
fprintf(fh,
"<message from='%s' to='%s' type='chat' id='%s'>"
"<active xmlns='http://jabber.org/protocol/chatstates'/>"
"<body>%s</body>"
"</message>\n", ctx->jid, to, ctx->id, msg);
fclose(fh);
err:
if (errno != 0)
perror(__func__);
}
char *
escape_tag(const char *string)
{
char *new;
char ch[2] = {'\0', '\0'};
size_t length = 1; /* One byte for the null character */
/* allocate the amount of space that we'll need */
for (size_t i = 0; string[i]; i++) {
/* For every <, we need 3 more bytes */
if (string[i] == '<') length += 4;
/* For every &, we need 4 more bytes */
else if (string[i] == '&') length += 5;
else length++;
}
if ((new = calloc(length, sizeof *new)) == NULL)
err(EXIT_FAILURE, "malloc");
for (; string[0]; string++) {
/* TODO: We should do official XML escaping here. */
switch (string[0]) {
case '<':
strlcat(new, "<", length);
break;
case '&':
strlcat(new, "&", length);
break;
default:
ch[0] = string[0];
strlcat(new, ch, length);
}
}
return new;
}
static bool
send_message(struct context *ctx, struct contact *con)
{
char prompt[BUFSIZ];
char buf[BUFSIZ];
char *escaped = NULL;
ssize_t size = 0;
if ((size = read(con->fd, buf, sizeof(buf) - 1)) < 0)
return false;
if (close(con->fd) == -1) return false;
if ((con->fd = open(con->in_path, O_RDONLY|O_NONBLOCK, 0)) == -1)
return false;
if (size == 0)
return true;
buf[size] = '\0';
/* Trim trailing control characters. */
while (iscntrl(buf[size - 1])) {
buf[size - 1] = '\0';
size--;
}
/* These characters must be escaped. */
if ((ssize_t)strcspn(buf, "<&") != size) {
/* Get a new string. */
escaped = escape_tag(buf);
}
msg_send(ctx, escaped ? escaped : buf, con->name);
free(escaped);
/* Write message to the out file, letting the user see its own messages. */
prepare_prompt(prompt, sizeof prompt, ctx->jid);
if (write(con->out, prompt, strlen(prompt)) == -1) return false;
if (write(con->out, buf, size) == -1) return false;
if (write(con->out, "\n", 1) == -1) return false;
return true;
}
static void
recv_message(char *tag, void *data)
{
struct context *ctx = data;
struct contact *c = NULL;
/* HACK: we need this, cause mxml can't parse tags by itself */
static mxml_node_t *tree = NULL;
mxml_node_t *node = NULL;
mxml_node_t *body = NULL;
const char *base = "<?xml ?>";
const char *tag_name = NULL;
const char *from = NULL;
char prompt[BUFSIZ];
if (tree == NULL) tree = mxmlLoadString(NULL, base, MXML_NO_CALLBACK);
if (tree == NULL) err(EXIT_FAILURE, "unable to load xml base");
mxmlLoadString(tree, tag, MXML_NO_CALLBACK);
if ((node = mxmlGetFirstChild(tree)) == NULL)
goto err;
if ((tag_name = mxmlGetElement(node)) == NULL) goto err;
if (strcmp("message", tag_name) != 0) goto err;
if ((from = mxmlElementGetAttr(node, "from")) == NULL) goto err;
/* try to find contact for this message in roster */
LIST_FOREACH(c, &ctx->roster, next)
if (strncmp(c->name, from, strlen(c->name)) == 0)
break;
/* if message comes from an unknown JID, create a contact */
if (c == NULL)
c = add_contact(ctx, from);
body = mxmlFindElement(tree, tree, "body", NULL, NULL,
MXML_DESCEND);
if (body == NULL)
goto err;
prepare_prompt(prompt, sizeof prompt, from);
write(c->out, prompt, strlen(prompt));
/* concatinate all text peaces */
for (mxml_node_t *txt = mxmlGetFirstChild(body); txt != NULL;
txt = mxmlGetNextSibling(txt)) {
int space = 0;
const char *t = mxmlGetText(txt, &space);
if (space == 1)
write(c->out, " ", 1);
if (write(c->out, t, strlen(t)) == -1) goto err;
}
write(c->out, "\n", 1);
err:
if (errno != 0)
perror(__func__);
mxmlDelete(node);
}
static bool
build_roster(struct context *ctx)
{
DIR *dirp;
struct dirent *dp;
if (ctx->dir == NULL) return false;
if ((dirp = opendir(ctx->dir)) == NULL) goto err;
while ((dp = readdir(dirp)) != NULL) {
if (strcmp(dp->d_name, ".") == 0 ||
strcmp(dp->d_name, "..") == 0 ||
strchr(dp->d_name, '@') == NULL ||
dp->d_type != DT_DIR) continue;
add_contact(ctx, dp->d_name);
}
closedir(dirp);
return true;
err:
if (errno != 0)
perror(__func__);
return false;
}
static void
signal_handler(int sig)
{
if (sig == SIGHUP) {
build_roster(global_ctx);
}
}
static void
usage(void)
{
fprintf(stderr, "usage: messaged -j jid -d dir\n");
exit(EXIT_FAILURE);
}
int
main(int argc, char *argv[])
{
struct context ctx = NULL_CONTEXT;
int ch;
while ((ch = getopt(argc, argv, "j:d:o:i:")) != -1) {
switch (ch) {
case 'i':
ctx.fd_in = strtol(optarg, NULL, 0);
break;
case 'o':
ctx.out_file = optarg;
break;
case 'j':
ctx.jid = optarg;
break;
case 'd':
ctx.dir = optarg;
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (ctx.jid == NULL)
usage();
if (ctx.out_file == NULL)
if (asprintf(&ctx.out_file, "%s/in", ctx.dir) < 0) goto err;
if (asprintf(&ctx.id, "messaged-%d", getpid()) < 0) goto err;
ctx.bxml = bxml_ctx_init(recv_message, &ctx);
/* check roster directory */
build_roster(&ctx);
global_ctx = &ctx;
signal(SIGHUP, signal_handler);
for (;;) {
struct contact *c = NULL;
int sel, max_fd = 0;
ssize_t n;
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(ctx.fd_in, &readfds);
max_fd = ctx.fd_in;
/* add all fd's from in-files to read list*/
LIST_FOREACH(c, &ctx.roster, next) {
FD_SET(c->fd, &readfds);
if (max_fd < c->fd)
max_fd = c->fd;
}
/* wait for input */
if ((sel = select(max_fd+1, &readfds, NULL, NULL, NULL)) == -1
&& errno != EINTR)
err(EXIT_FAILURE, "select");
/* check for input from server */
if (FD_ISSET(ctx.fd_in, &readfds)) {
char buf[BUFSIZ];
if ((n = read(ctx.fd_in, buf, BUFSIZ)) < 0) goto err;
if (n == 0) break; /* connection closed */
bxml_add_buf(ctx.bxml, buf, n);
sel--;
}
/* check for input form in-files */
LIST_FOREACH(c, &ctx.roster, next)
if (FD_ISSET(c->fd, &readfds))
if (send_message(&ctx, c) == false) goto err;
}
return EXIT_SUCCESS;
err:
if (errno != 0)
perror(NULL);
return EXIT_FAILURE;
}