| 1 | /* |
| 2 | ashd - A Sane HTTP Daemon |
| 3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation, either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <stdlib.h> |
| 20 | #include <unistd.h> |
| 21 | #include <stdio.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/select.h> |
| 24 | #include <sys/socket.h> |
| 25 | #include <netinet/in.h> |
| 26 | #include <errno.h> |
| 27 | |
| 28 | #ifdef HAVE_CONFIG_H |
| 29 | #include <config.h> |
| 30 | #endif |
| 31 | #include <utils.h> |
| 32 | #include <mt.h> |
| 33 | #include <log.h> |
| 34 | |
| 35 | #define EV_READ 1 |
| 36 | #define EV_WRITE 2 |
| 37 | |
| 38 | struct blocker { |
| 39 | struct blocker *n, *p; |
| 40 | int fd; |
| 41 | int ev; |
| 42 | struct muth *th; |
| 43 | }; |
| 44 | |
| 45 | static struct blocker *blockers; |
| 46 | |
| 47 | static int block(int fd, int ev) |
| 48 | { |
| 49 | struct blocker *bl; |
| 50 | int rv; |
| 51 | |
| 52 | omalloc(bl); |
| 53 | bl->fd = fd; |
| 54 | bl->ev = ev; |
| 55 | bl->th = current; |
| 56 | bl->n = blockers; |
| 57 | if(blockers) |
| 58 | blockers->p = bl; |
| 59 | blockers = bl; |
| 60 | rv = yield(); |
| 61 | if(bl->n) |
| 62 | bl->n->p = bl->p; |
| 63 | if(bl->p) |
| 64 | bl->p->n = bl->n; |
| 65 | if(bl == blockers) |
| 66 | blockers = bl->n; |
| 67 | return(rv); |
| 68 | } |
| 69 | |
| 70 | static int listensock4(int port) |
| 71 | { |
| 72 | struct sockaddr_in name; |
| 73 | int fd; |
| 74 | int valbuf; |
| 75 | |
| 76 | memset(&name, 0, sizeof(name)); |
| 77 | name.sin_family = AF_INET; |
| 78 | name.sin_port = htons(port); |
| 79 | if((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) |
| 80 | return(-1); |
| 81 | valbuf = 1; |
| 82 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &valbuf, sizeof(valbuf)); |
| 83 | if(bind(fd, (struct sockaddr *)&name, sizeof(name))) { |
| 84 | close(fd); |
| 85 | return(-1); |
| 86 | } |
| 87 | if(listen(fd, 16) < 0) { |
| 88 | close(fd); |
| 89 | return(-1); |
| 90 | } |
| 91 | return(fd); |
| 92 | } |
| 93 | |
| 94 | static int listensock6(int port) |
| 95 | { |
| 96 | struct sockaddr_in6 name; |
| 97 | int fd; |
| 98 | int valbuf; |
| 99 | |
| 100 | memset(&name, 0, sizeof(name)); |
| 101 | name.sin6_family = AF_INET6; |
| 102 | name.sin6_port = htons(port); |
| 103 | if((fd = socket(PF_INET6, SOCK_STREAM, 0)) < 0) |
| 104 | return(-1); |
| 105 | valbuf = 1; |
| 106 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &valbuf, sizeof(valbuf)); |
| 107 | if(bind(fd, (struct sockaddr *)&name, sizeof(name))) { |
| 108 | close(fd); |
| 109 | return(-1); |
| 110 | } |
| 111 | if(listen(fd, 16) < 0) { |
| 112 | close(fd); |
| 113 | return(-1); |
| 114 | } |
| 115 | return(fd); |
| 116 | } |
| 117 | |
| 118 | static void listenloop(struct muth *muth, va_list args) |
| 119 | { |
| 120 | vavar(int, ss); |
| 121 | int ns; |
| 122 | struct sockaddr_storage name; |
| 123 | socklen_t namelen; |
| 124 | |
| 125 | while(1) { |
| 126 | namelen = sizeof(name); |
| 127 | block(ss, EV_READ); |
| 128 | ns = accept(ss, (struct sockaddr *)&name, &namelen); |
| 129 | block(ns, EV_WRITE); |
| 130 | write(ns, "test\n", 5); |
| 131 | close(ns); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | static void ioloop(void) |
| 136 | { |
| 137 | int ret; |
| 138 | fd_set rfds, wfds, efds; |
| 139 | struct blocker *bl, *nbl; |
| 140 | int maxfd; |
| 141 | int ev; |
| 142 | |
| 143 | while(1) { |
| 144 | FD_ZERO(&rfds); |
| 145 | FD_ZERO(&wfds); |
| 146 | FD_ZERO(&efds); |
| 147 | maxfd = 0; |
| 148 | for(bl = blockers; bl; bl = bl->n) { |
| 149 | if(bl->ev & EV_READ) |
| 150 | FD_SET(bl->fd, &rfds); |
| 151 | if(bl->ev & EV_WRITE) |
| 152 | FD_SET(bl->fd, &wfds); |
| 153 | FD_SET(bl->fd, &efds); |
| 154 | if(bl->fd > maxfd) |
| 155 | maxfd = bl->fd; |
| 156 | } |
| 157 | ret = select(maxfd + 1, &rfds, &wfds, &efds, NULL); |
| 158 | if(ret < 0) { |
| 159 | if(errno != EINTR) { |
| 160 | flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno)); |
| 161 | /* To avoid CPU hogging in case it's bad, which it |
| 162 | * probably is. */ |
| 163 | sleep(1); |
| 164 | } |
| 165 | } |
| 166 | for(bl = blockers; bl; bl = nbl) { |
| 167 | nbl = bl->n; |
| 168 | ev = 0; |
| 169 | if(FD_ISSET(bl->fd, &rfds)) |
| 170 | ev |= EV_READ; |
| 171 | if(FD_ISSET(bl->fd, &wfds)) |
| 172 | ev |= EV_WRITE; |
| 173 | if(FD_ISSET(bl->fd, &efds)) |
| 174 | ev = -1; |
| 175 | resume(bl->th, ev); |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | int main(int argc, char **argv) |
| 181 | { |
| 182 | int fd; |
| 183 | |
| 184 | if((fd = listensock6(8080)) < 0) { |
| 185 | flog(LOG_ERR, "could not listen on IPv6: %s", strerror(errno)); |
| 186 | return(1); |
| 187 | } |
| 188 | mustart(listenloop, fd); |
| 189 | if((fd = listensock4(8080)) < 0) { |
| 190 | if(errno != EADDRINUSE) { |
| 191 | flog(LOG_ERR, "could not listen on IPv4: %s", strerror(errno)); |
| 192 | return(1); |
| 193 | } |
| 194 | } else { |
| 195 | mustart(listenloop, fd); |
| 196 | } |
| 197 | ioloop(); |
| 198 | return(0); |
| 199 | } |