| 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 | #ifdef HAVE_CONFIG_H |
| 20 | #include <config.h> |
| 21 | #endif |
| 22 | #include <stdlib.h> |
| 23 | #include <stdio.h> |
| 24 | #include <unistd.h> |
| 25 | #include <fcntl.h> |
| 26 | #include <string.h> |
| 27 | #include <errno.h> |
| 28 | #include <sys/socket.h> |
| 29 | |
| 30 | #include <log.h> |
| 31 | #include <utils.h> |
| 32 | #include <mt.h> |
| 33 | #include <mtio.h> |
| 34 | |
| 35 | static ssize_t mtread(void *cookie, void *buf, size_t len) |
| 36 | { |
| 37 | struct stdiofd *d = cookie; |
| 38 | int ev; |
| 39 | ssize_t ret; |
| 40 | |
| 41 | while(1) { |
| 42 | ret = read(d->fd, buf, len); |
| 43 | if((ret < 0) && (errno == EAGAIN)) { |
| 44 | ev = block(d->fd, EV_READ, d->timeout); |
| 45 | if(ev < 0) { |
| 46 | /* If we just go on, we should get the real error. */ |
| 47 | continue; |
| 48 | } else if(ev == 0) { |
| 49 | errno = ETIMEDOUT; |
| 50 | return(-1); |
| 51 | } else { |
| 52 | continue; |
| 53 | } |
| 54 | } else { |
| 55 | return(ret); |
| 56 | } |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | static ssize_t mtwrite(void *cookie, const void *buf, size_t len) |
| 61 | { |
| 62 | struct stdiofd *d = cookie; |
| 63 | int ev; |
| 64 | ssize_t ret; |
| 65 | |
| 66 | while(1) { |
| 67 | if(d->sock) |
| 68 | ret = send(d->fd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL); |
| 69 | else |
| 70 | ret = write(d->fd, buf, len); |
| 71 | if((ret < 0) && (errno == EAGAIN)) { |
| 72 | ev = block(d->fd, EV_WRITE, d->timeout); |
| 73 | if(ev < 0) { |
| 74 | /* If we just go on, we should get the real error. */ |
| 75 | continue; |
| 76 | } else if(ev == 0) { |
| 77 | errno = ETIMEDOUT; |
| 78 | return(-1); |
| 79 | } |
| 80 | } else { |
| 81 | return(ret); |
| 82 | } |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | static int mtclose(void *cookie) |
| 87 | { |
| 88 | struct stdiofd *d = cookie; |
| 89 | |
| 90 | close(d->fd); |
| 91 | free(d); |
| 92 | return(0); |
| 93 | } |
| 94 | |
| 95 | FILE *mtstdopen(int fd, int issock, int timeout, char *mode, struct stdiofd **infop) |
| 96 | { |
| 97 | struct stdiofd *d; |
| 98 | FILE *ret; |
| 99 | int r, w; |
| 100 | |
| 101 | if(!strcmp(mode, "r")) { |
| 102 | r = 1; w = 0; |
| 103 | } else if(!strcmp(mode, "w")) { |
| 104 | r = 0; w = 1; |
| 105 | } else if(!strcmp(mode, "r+")) { |
| 106 | r = w = 1; |
| 107 | } else { |
| 108 | return(NULL); |
| 109 | } |
| 110 | omalloc(d); |
| 111 | d->fd = fd; |
| 112 | d->sock = issock; |
| 113 | d->timeout = timeout; |
| 114 | if(!(ret = funstdio(d, r?mtread:NULL, w?mtwrite:NULL, NULL, mtclose))) { |
| 115 | free(d); |
| 116 | return(NULL); |
| 117 | } |
| 118 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); |
| 119 | if(infop) |
| 120 | *infop = d; |
| 121 | return(ret); |
| 122 | } |
| 123 | |
| 124 | struct pipe { |
| 125 | struct charbuf data; |
| 126 | size_t bufmax; |
| 127 | int closed; |
| 128 | struct muth *r, *w; |
| 129 | }; |
| 130 | |
| 131 | static void freepipe(struct pipe *p) |
| 132 | { |
| 133 | buffree(p->data); |
| 134 | free(p); |
| 135 | } |
| 136 | |
| 137 | static ssize_t piperead(void *pdata, void *buf, size_t len) |
| 138 | { |
| 139 | struct pipe *p = pdata; |
| 140 | ssize_t ret; |
| 141 | |
| 142 | while(p->data.d == 0) { |
| 143 | if(p->closed & 2) |
| 144 | return(0); |
| 145 | if(p->r) { |
| 146 | errno = EBUSY; |
| 147 | return(-1); |
| 148 | } |
| 149 | p->r = current; |
| 150 | yield(); |
| 151 | p->r = NULL; |
| 152 | } |
| 153 | ret = min(len, p->data.d); |
| 154 | memcpy(buf, p->data.b, ret); |
| 155 | memmove(p->data.b, p->data.b + ret, p->data.d -= ret); |
| 156 | if(p->w) |
| 157 | resume(p->w, 0); |
| 158 | return(ret); |
| 159 | } |
| 160 | |
| 161 | static int piperclose(void *pdata) |
| 162 | { |
| 163 | struct pipe *p = pdata; |
| 164 | |
| 165 | if(p->closed & 2) { |
| 166 | freepipe(p); |
| 167 | } else { |
| 168 | p->closed |= 1; |
| 169 | if(p->w) |
| 170 | resume(p->w, 0); |
| 171 | } |
| 172 | return(0); |
| 173 | } |
| 174 | |
| 175 | static ssize_t pipewrite(void *pdata, const void *buf, size_t len) |
| 176 | { |
| 177 | struct pipe *p = pdata; |
| 178 | ssize_t ret; |
| 179 | |
| 180 | if(p->closed & 1) { |
| 181 | errno = EPIPE; |
| 182 | return(-1); |
| 183 | } |
| 184 | while(p->data.d >= p->bufmax) { |
| 185 | if(p->w) { |
| 186 | errno = EBUSY; |
| 187 | return(-1); |
| 188 | } |
| 189 | p->w = current; |
| 190 | yield(); |
| 191 | p->w = NULL; |
| 192 | if(p->closed & 1) { |
| 193 | errno = EPIPE; |
| 194 | return(-1); |
| 195 | } |
| 196 | } |
| 197 | ret = min(len, p->bufmax - p->data.d); |
| 198 | sizebuf(p->data, p->data.d + ret); |
| 199 | memcpy(p->data.b + p->data.d, buf, ret); |
| 200 | p->data.d += ret; |
| 201 | if(p->r) |
| 202 | resume(p->r, 0); |
| 203 | return(ret); |
| 204 | } |
| 205 | |
| 206 | static int pipewclose(void *pdata) |
| 207 | { |
| 208 | struct pipe *p = pdata; |
| 209 | |
| 210 | if(p->closed & 1) { |
| 211 | freepipe(p); |
| 212 | } else { |
| 213 | p->closed |= 2; |
| 214 | if(p->r) |
| 215 | resume(p->r, 0); |
| 216 | } |
| 217 | return(0); |
| 218 | } |
| 219 | |
| 220 | void mtiopipe(FILE **read, FILE **write) |
| 221 | { |
| 222 | struct pipe *p; |
| 223 | |
| 224 | omalloc(p); |
| 225 | p->bufmax = 4096; |
| 226 | *read = funstdio(p, piperead, NULL, NULL, piperclose); |
| 227 | *write = funstdio(p, NULL, pipewrite, NULL, pipewclose); |
| 228 | } |