| 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 <string.h> |
| 21 | #include <unistd.h> |
| 22 | #include <sys/socket.h> |
| 23 | #include <errno.h> |
| 24 | #include <ctype.h> |
| 25 | |
| 26 | #ifdef HAVE_CONFIG_H |
| 27 | #include <config.h> |
| 28 | #endif |
| 29 | #include <utils.h> |
| 30 | #include <log.h> |
| 31 | #include <proc.h> |
| 32 | #include <req.h> |
| 33 | |
| 34 | int stdmkchild(char **argv) |
| 35 | { |
| 36 | int i; |
| 37 | pid_t pid; |
| 38 | int fd[2]; |
| 39 | |
| 40 | if(socketpair(PF_UNIX, SOCK_SEQPACKET, 0, fd)) |
| 41 | return(-1); |
| 42 | if((pid = fork()) < 0) |
| 43 | return(-1); |
| 44 | if(pid == 0) { |
| 45 | for(i = 3; i < FD_SETSIZE; i++) { |
| 46 | if(i != fd[0]) |
| 47 | close(i); |
| 48 | } |
| 49 | dup2(fd[0], 0); |
| 50 | close(fd[0]); |
| 51 | execvp(argv[0], argv); |
| 52 | flog(LOG_WARNING, "could not exec child program %s: %s", argv[0], strerror(errno)); |
| 53 | exit(127); |
| 54 | } |
| 55 | close(fd[0]); |
| 56 | return(fd[1]); |
| 57 | } |
| 58 | |
| 59 | int sendfd(int sock, int fd, char *data, size_t datalen) |
| 60 | { |
| 61 | struct msghdr msg; |
| 62 | struct cmsghdr *cmsg; |
| 63 | char cmbuf[CMSG_SPACE(sizeof(int))]; |
| 64 | struct iovec bufvec; |
| 65 | |
| 66 | memset(&msg, 0, sizeof(msg)); |
| 67 | msg.msg_iov = &bufvec; |
| 68 | msg.msg_iovlen = 1; |
| 69 | bufvec.iov_base = data; |
| 70 | bufvec.iov_len = datalen; |
| 71 | |
| 72 | msg.msg_control = cmbuf; |
| 73 | msg.msg_controllen = sizeof(cmbuf); |
| 74 | cmsg = CMSG_FIRSTHDR(&msg); |
| 75 | cmsg->cmsg_level = SOL_SOCKET; |
| 76 | cmsg->cmsg_type = SCM_RIGHTS; |
| 77 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); |
| 78 | *((int *)CMSG_DATA(cmsg)) = fd; |
| 79 | msg.msg_controllen = cmsg->cmsg_len; |
| 80 | |
| 81 | return(sendmsg(sock, &msg, MSG_NOSIGNAL | MSG_DONTWAIT)); |
| 82 | } |
| 83 | |
| 84 | int recvfd(int sock, char **data, size_t *datalen) |
| 85 | { |
| 86 | int ret, fd; |
| 87 | char *buf, cbuf[1024];; |
| 88 | struct msghdr msg; |
| 89 | struct cmsghdr *cmsg; |
| 90 | struct iovec bufvec; |
| 91 | |
| 92 | buf = smalloc(65536); |
| 93 | memset(&msg, 0, sizeof(msg)); |
| 94 | |
| 95 | msg.msg_iov = &bufvec; |
| 96 | msg.msg_iovlen = 1; |
| 97 | bufvec.iov_base = buf; |
| 98 | bufvec.iov_len = 65536; |
| 99 | msg.msg_control = cbuf; |
| 100 | msg.msg_controllen = sizeof(cbuf); |
| 101 | |
| 102 | ret = recvmsg(sock, &msg, 0); |
| 103 | if(ret <= 0) { |
| 104 | free(buf); |
| 105 | if(ret == 0) |
| 106 | errno = 0; |
| 107 | return(-1); |
| 108 | } |
| 109 | |
| 110 | fd = -1; |
| 111 | for(cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) { |
| 112 | if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_RIGHTS)) { |
| 113 | fd = *((int *)CMSG_DATA(cmsg)); |
| 114 | } |
| 115 | } |
| 116 | if(fd < 0) { |
| 117 | free(buf); |
| 118 | errno = EPROTO; |
| 119 | return(-1); |
| 120 | } |
| 121 | buf = realloc(buf, ret); |
| 122 | *data = buf; |
| 123 | *datalen = ret; |
| 124 | return(fd); |
| 125 | } |
| 126 | |
| 127 | pid_t stdforkserve(char **argv, struct hthead *req, int fd) |
| 128 | { |
| 129 | int i; |
| 130 | char *ebuf, *p; |
| 131 | pid_t pid; |
| 132 | struct charvbuf args; |
| 133 | |
| 134 | if((pid = fork()) < 0) |
| 135 | return(-1); |
| 136 | if(pid == 0) { |
| 137 | dup2(fd, 0); |
| 138 | dup2(fd, 1); |
| 139 | for(i = 3; i < FD_SETSIZE; i++) |
| 140 | close(i); |
| 141 | |
| 142 | bufinit(args); |
| 143 | for(i = 0; argv[i]; i++) |
| 144 | bufadd(args, argv[i]); |
| 145 | bufadd(args, req->method); |
| 146 | bufadd(args, req->url); |
| 147 | bufadd(args, req->rest); |
| 148 | bufadd(args, NULL); |
| 149 | |
| 150 | for(i = 0; i < req->noheaders; i++) { |
| 151 | ebuf = sstrdup(req->headers[i][0]); |
| 152 | for(p = ebuf; *p; p++) { |
| 153 | if(isalnum(*p)) |
| 154 | *p = toupper(*p); |
| 155 | else |
| 156 | *p = '_'; |
| 157 | } |
| 158 | putenv(sprintf2("REQ_%s=%s", ebuf, req->headers[i][1])); |
| 159 | } |
| 160 | putenv(sprintf2("HTTP_VERSION=%s", req->ver)); |
| 161 | |
| 162 | execvp(args.b[0], args.b); |
| 163 | flog(LOG_WARNING, "could not exec child program %s: %s", argv[0], strerror(errno)); |
| 164 | exit(127); |
| 165 | } |
| 166 | return(pid); |
| 167 | } |