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#include "unix.h"
#include "conf.h"
#include "irc.h"
static int
sock_perms(char fname[])
{
// first get group by name
struct group *group;
if ((group = getgrnam(SOCKETGROUP)) == NULL) {
fprintf(stderr,"no such group: %s\n",SOCKETGROUP);
return -1;
}
// set group on socket
if (chown(fname, -1, group->gr_gid) == -1) {
perror("chown");
return -1;
}
// get current permissions, so we can modify them.
struct stat sb;
if (stat(fname, &sb) == -1) {
perror("stat");
return -1;
}
if (chmod(fname, sb.st_mode|S_IWGRP) == -1) {
perror("chmod");
return -1;
}
return 0;
}
// takes filename, returns socket fd
// or -1 or whatever
int
unix_setup(char filename[])
{
unlink(filename);
int sock = socket(AF_UNIX, SOCK_DGRAM, 0);
if (sock == -1) {
perror("(unix) socket");
return -1;
}
struct sockaddr_un name;
memset(&name, 0, sizeof name);
name.sun_family = AF_UNIX;
strncpy(name.sun_path, filename, (sizeof name.sun_path)-1);
if (bind(sock, (struct sockaddr *)&name, sizeof name) == -1) {
perror("(unix) bind");
return -1;
}
if (sock_perms(filename) == -1) {
fprintf(stderr,"warning: couldn't correctly set up permissions on %s\n",filename);
}
return sock;
}
// reads a message from the fd in question, and sends it to irc
int
unix_handle(int fd, char chname[])
{
// PRIVMSG #{chname} :{message}<CR><LF>
// 123456789 12 3 4
// 512 >= 13 + strlen(chname) + length of message
// chname can be max 16 bytes, so worst case
// 512 >= 13 + 16 + length of message
// 483 >= length of message
// 480 is slightly pessimistic but it's a rounder number.
// (one more byte for null terminator needed by snprintf)
unsigned char buf[481];
if (strlen(chname) > 16) {
fprintf(stderr,"channel name %s is longer than 16 bytes, ignoring\n",chname);
return -1;
}
ssize_t amt;
if ((amt = recv(fd, buf, sizeof buf-1,0)) == -1) {
perror("recv");
return -1;
} else if (amt == 0) {
fputs("unix eof\n",stderr);
return -1;
} else {
int i;
for (i=0;i<amt;i++) {
if (buf[i] < ' ') {
buf[i] = ' ';
}
}
buf[amt] = '\0';
char msg[512];
int s;
if ((s=snprintf(msg,512,"PRIVMSG #%s :%s\r\n",chname,buf)) > 512) {
fprintf(stderr,"irc message was somehow too long (this should never happen) (%d)/512\n",s);
return -1;
}
if (irc_sendall(msg, s) == -1) {
perror("sendall");
return -1;
};
return 0;
}
}
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