| 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 <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <unistd.h> |
| 22 | #include <errno.h> |
| 23 | #include <err.h> |
| 24 | #include <sys/poll.h> |
| 25 | #include <sys/socket.h> |
| 26 | #include <sys/un.h> |
| 27 | #include <sys/stat.h> |
| 28 | #include <sys/wait.h> |
| 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | #include <config.h> |
| 32 | #endif |
| 33 | #include <utils.h> |
| 34 | #include <log.h> |
| 35 | #include <req.h> |
| 36 | #include <proc.h> |
| 37 | |
| 38 | static void usage(FILE *out) |
| 39 | { |
| 40 | fprintf(out, "usge: htpipe [-h] [-CS] SOCKET-PATH [CHILD ARGS...]\n"); |
| 41 | } |
| 42 | |
| 43 | static int clconnect(char *path) |
| 44 | { |
| 45 | int sk; |
| 46 | struct sockaddr_un unm; |
| 47 | |
| 48 | if((sk = socket(AF_UNIX, SOCK_SEQPACKET, 0)) < 0) |
| 49 | return(-1); |
| 50 | memset(&unm, 0, sizeof(unm)); |
| 51 | unm.sun_family = AF_UNIX; |
| 52 | strcpy(unm.sun_path, path); |
| 53 | if(connect(sk, (struct sockaddr *)&unm, sizeof(unm))) { |
| 54 | close(sk); |
| 55 | return(-1); |
| 56 | } |
| 57 | return(sk); |
| 58 | } |
| 59 | |
| 60 | static int mklisten(char *path) |
| 61 | { |
| 62 | int sk; |
| 63 | struct sockaddr_un unm; |
| 64 | struct stat sb; |
| 65 | |
| 66 | if(!stat(path, &sb) && S_ISSOCK(sb.st_mode)) |
| 67 | unlink(path); |
| 68 | if((sk = socket(AF_UNIX, SOCK_SEQPACKET, 0)) < 0) |
| 69 | return(-1); |
| 70 | memset(&unm, 0, sizeof(unm)); |
| 71 | unm.sun_family = AF_UNIX; |
| 72 | strcpy(unm.sun_path, path); |
| 73 | if(bind(sk, (struct sockaddr *)&unm, sizeof(unm)) || listen(sk, 128)) { |
| 74 | close(sk); |
| 75 | return(-1); |
| 76 | } |
| 77 | return(sk); |
| 78 | } |
| 79 | |
| 80 | static void runclient(int sk) |
| 81 | { |
| 82 | int fd; |
| 83 | struct hthead *req; |
| 84 | |
| 85 | while(1) { |
| 86 | if((fd = recvreq(0, &req)) < 0) { |
| 87 | if(errno == 0) |
| 88 | break; |
| 89 | flog(LOG_ERR, "htpipe: error in recvreq: %s", strerror(errno)); |
| 90 | exit(1); |
| 91 | } |
| 92 | if(sendreq(sk, req, fd)) { |
| 93 | flog(LOG_ERR, "htpipe: could not pass request across pipe: %s", strerror(errno)); |
| 94 | exit(1); |
| 95 | } |
| 96 | freehthead(req); |
| 97 | close(fd); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | static void runserver(int lsk, int ch) |
| 102 | { |
| 103 | int i, o, ret, rfd, ncl, *cl, acl; |
| 104 | struct hthead *req; |
| 105 | |
| 106 | ncl = 0; |
| 107 | cl = NULL; |
| 108 | while(1) { |
| 109 | struct pollfd pfd[ncl + 1]; |
| 110 | for(i = 0; i < ncl; i++) { |
| 111 | pfd[i].fd = cl[i]; |
| 112 | pfd[i].events= POLLIN; |
| 113 | } |
| 114 | pfd[i].fd = lsk; |
| 115 | pfd[i].events = POLLIN; |
| 116 | if((ret = poll(pfd, ncl + 1, -1)) < 0) { |
| 117 | if(errno != EINTR) { |
| 118 | flog(LOG_ERR, "htpipe: error in poll: %s", strerror(errno)); |
| 119 | exit(1); |
| 120 | } |
| 121 | } |
| 122 | for(i = 0; i < ncl; i++) { |
| 123 | if(pfd[i].revents & POLLIN) { |
| 124 | if((rfd = recvreq(cl[i], &req)) < 0) { |
| 125 | if(errno != 0) |
| 126 | flog(LOG_ERR, "htpipe: error from client: %s", strerror(errno)); |
| 127 | cl[i] = -1; |
| 128 | } else { |
| 129 | if(sendreq(ch, req, rfd)) { |
| 130 | flog(LOG_ERR, "htpipe: could not pass request to child: %s", strerror(errno)); |
| 131 | exit(1); |
| 132 | } |
| 133 | freehthead(req); |
| 134 | close(rfd); |
| 135 | } |
| 136 | } |
| 137 | } |
| 138 | if(pfd[i].revents & POLLIN) { |
| 139 | if((acl = accept(lsk, NULL, 0)) < 0) { |
| 140 | flog(LOG_ERR, "htpipe: error in accept: %s", strerror(errno)); |
| 141 | } else { |
| 142 | cl = srealloc(cl, sizeof(*cl) * (ncl + 1)); |
| 143 | cl[ncl++] = acl; |
| 144 | } |
| 145 | } |
| 146 | for(i = o = 0; i < ncl; i++) { |
| 147 | if(cl[i] >= 0) |
| 148 | cl[o++] = cl[i]; |
| 149 | } |
| 150 | ncl = o; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | int main(int argc, char **argv) |
| 155 | { |
| 156 | int c, cli, srv, sk, ch, sst; |
| 157 | pid_t sproc; |
| 158 | char *path, **chspec; |
| 159 | |
| 160 | cli = srv = 0; |
| 161 | while((c = getopt(argc, argv, "+hCS")) >= 0) { |
| 162 | switch(c) { |
| 163 | case 'h': |
| 164 | usage(stdout); |
| 165 | exit(0); |
| 166 | case 'C': |
| 167 | cli = 1; |
| 168 | break; |
| 169 | case 'S': |
| 170 | srv = 1; |
| 171 | break; |
| 172 | } |
| 173 | } |
| 174 | if(argc - optind < 1) { |
| 175 | usage(stderr); |
| 176 | exit(1); |
| 177 | } |
| 178 | path = argv[optind++]; |
| 179 | chspec = argv + optind; |
| 180 | if(cli) { |
| 181 | if((sk = clconnect(path)) < 0) { |
| 182 | flog(LOG_ERR, "htpipe: %s: %s", path, strerror(errno)); |
| 183 | exit(1); |
| 184 | } |
| 185 | runclient(sk); |
| 186 | } else if(srv) { |
| 187 | if(!*chspec) { |
| 188 | usage(stderr); |
| 189 | exit(1); |
| 190 | } |
| 191 | if((sk = mklisten(path)) < 0) { |
| 192 | flog(LOG_ERR, "htpipe: %s: %s", path, strerror(errno)); |
| 193 | exit(1); |
| 194 | } |
| 195 | if((ch = stdmkchild(chspec, NULL, NULL)) < 0) { |
| 196 | flog(LOG_ERR, "htpipe: could not fork child: %s", strerror(errno)); |
| 197 | exit(1); |
| 198 | } |
| 199 | runserver(sk, ch); |
| 200 | } else { |
| 201 | if(!*chspec) { |
| 202 | usage(stderr); |
| 203 | exit(1); |
| 204 | } |
| 205 | if((sk = clconnect(path)) < 0) { |
| 206 | if((sproc = fork()) < 0) |
| 207 | err(1, "fork"); |
| 208 | if(sproc == 0) { |
| 209 | if((sk = mklisten(path)) < 0) { |
| 210 | flog(LOG_ERR, "htpipe: %s: %s", path, strerror(errno)); |
| 211 | exit(1); |
| 212 | } |
| 213 | if((ch = stdmkchild(chspec, NULL, NULL)) < 0) { |
| 214 | flog(LOG_ERR, "htpipe: could not fork child: %s", strerror(errno)); |
| 215 | exit(1); |
| 216 | } |
| 217 | daemon(0, 1); |
| 218 | runserver(sk, ch); |
| 219 | abort(); |
| 220 | } |
| 221 | if((waitpid(sproc, &sst, 0)) != sproc) { |
| 222 | flog(LOG_ERR, "htpipe: could not wait for server process: %s", strerror(errno)); |
| 223 | exit(1); |
| 224 | } |
| 225 | if((sk = clconnect(path)) < 0) { |
| 226 | flog(LOG_ERR, "htpipe: could not connect to newly forked server: %s", strerror(errno)); |
| 227 | exit(1); |
| 228 | } |
| 229 | } |
| 230 | runclient(sk); |
| 231 | } |
| 232 | return(0); |
| 233 | } |