#include "buffer.h" #include "server.h" #include "keyvalue.h" #include "log.h" #include "http_chunk.h" #include "fdevent.h" #include "connections.h" #include "response.h" #include "joblist.h" #include "plugin.h" #include "inet_ntop_cache.h" #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_SYS_FILIO_H # include #endif #include "sys-socket.h" #ifdef HAVE_SYS_UIO_H # include #endif #ifdef HAVE_SYS_WAIT_H # include #endif #include "version.h" enum {EOL_UNSET, EOL_N, EOL_RN}; /* * * TODO: * * - add timeout for a connect to a non-scgi process * (use state_timestamp + state) * */ typedef struct scgi_proc { size_t id; /* id will be between 1 and max_procs */ buffer *socket; /* config.socket + "-" + id */ unsigned port; /* config.port + pno */ pid_t pid; /* PID of the spawned process (0 if not spawned locally) */ size_t load; /* number of requests waiting on this process */ time_t last_used; /* see idle_timeout */ size_t requests; /* see max_requests */ struct scgi_proc *prev, *next; /* see first */ time_t disable_ts; /* replace by host->something */ int is_local; enum { PROC_STATE_UNSET, /* init-phase */ PROC_STATE_RUNNING, /* alive */ PROC_STATE_DIED_WAIT_FOR_PID, PROC_STATE_KILLED, /* was killed as we don't have the load anymore */ PROC_STATE_DIED, /* marked as dead, should be restarted */ PROC_STATE_DISABLED /* proc disabled as it resulted in an error */ } state; } scgi_proc; typedef struct { /* list of processes handling this extension * sorted by lowest load * * whenever a job is done move it up in the list * until it is sorted, move it down as soon as the * job is started */ scgi_proc *first; scgi_proc *unused_procs; /* * spawn at least min_procs, at max_procs. * * as soon as the load of the first entry * is max_load_per_proc we spawn a new one * and add it to the first entry and give it * the load * */ unsigned short min_procs; unsigned short max_procs; size_t num_procs; /* how many procs are started */ size_t active_procs; /* how many of them are really running */ unsigned short max_load_per_proc; /* * kick the process from the list if it was not * used for idle_timeout until min_procs is * reached. this helps to get the processlist * small again we had a small peak load. * */ unsigned short idle_timeout; /* * time after a disabled remote connection is tried to be re-enabled * * */ unsigned short disable_time; /* * same scgi processes get a little bit larger * than wanted. max_requests_per_proc kills a * process after a number of handled requests. * */ size_t max_requests_per_proc; /* config */ /* * host:port * * if host is one of the local IP adresses the * whole connection is local * * if tcp/ip should be used host AND port have * to be specified * */ buffer *host; unsigned short port; /* * Unix Domain Socket * * instead of TCP/IP we can use Unix Domain Sockets * - more secure (you have fileperms to play with) * - more control (on locally) * - more speed (no extra overhead) */ buffer *unixsocket; /* if socket is local we can start the scgi * process ourself * * bin-path is the path to the binary * * check min_procs and max_procs for the number * of process to start-up */ buffer *bin_path; /* bin-path is set bin-environment is taken to * create the environement before starting the * FastCGI process * */ array *bin_env; array *bin_env_copy; /* * docroot-translation between URL->phys and the * remote host * * reasons: * - different dir-layout if remote * - chroot if local * */ buffer *docroot; /* * check_local tell you if the phys file is stat()ed * or not. FastCGI doesn't care if the service is * remote. If the web-server side doesn't contain * the scgi-files we should not stat() for them * and say '404 not found'. */ unsigned short check_local; /* * append PATH_INFO to SCRIPT_FILENAME * * php needs this if cgi.fix_pathinfo is provied * */ /* * workaround for program when prefix="/" * * rule to build PATH_INFO is hardcoded for when check_local is disabled * enable this option to use the workaround * */ unsigned short fix_root_path_name; ssize_t load; /* replace by host->load */ size_t max_id; /* corresponds most of the time to num_procs. only if a process is killed max_id waits for the process itself to die and decrements its afterwards */ } scgi_extension_host; /* * one extension can have multiple hosts assigned * one host can spawn additional processes on the same * socket (if we control it) * * ext -> host -> procs * 1:n 1:n * * if the scgi process is remote that whole goes down * to * * ext -> host -> procs * 1:n 1:1 * * in case of PHP and FCGI_CHILDREN we have again a procs * but we don't control it directly. * */ typedef struct { buffer *key; /* like .php */ int note_is_sent; scgi_extension_host **hosts; size_t used; size_t size; } scgi_extension; typedef struct { scgi_extension **exts; size_t used; size_t size; } scgi_exts; typedef struct { scgi_exts *exts; int debug; } plugin_config; typedef struct { char **ptr; size_t size; size_t used; } char_array; /* generic plugin data, shared between all connections */ typedef struct { PLUGIN_DATA; buffer *scgi_env; buffer *path; buffer *parse_response; plugin_config **config_storage; plugin_config conf; /* this is only used as long as no handler_ctx is setup */ } plugin_data; /* connection specific data */ typedef enum { FCGI_STATE_INIT, FCGI_STATE_CONNECT, FCGI_STATE_PREPARE_WRITE, FCGI_STATE_WRITE, FCGI_STATE_READ } scgi_connection_state_t; typedef struct { buffer *response; size_t response_len; int response_type; int response_padding; scgi_proc *proc; scgi_extension_host *host; scgi_connection_state_t state; time_t state_timestamp; int reconnects; /* number of reconnect attempts */ chunkqueue *wb; buffer *response_header; int delayed; /* flag to mark that the connect() is delayed */ size_t request_id; int fd; /* fd to the scgi process */ int fde_ndx; /* index into the fd-event buffer */ pid_t pid; int got_proc; plugin_config conf; connection *remote_conn; /* dumb pointer */ plugin_data *plugin_data; /* dumb pointer */ } handler_ctx; /* ok, we need a prototype */ static handler_t scgi_handle_fdevent(server *srv, void *ctx, int revents); int scgi_proclist_sort_down(server *srv, scgi_extension_host *host, scgi_proc *proc); static void reset_signals(void) { #ifdef SIGTTOU signal(SIGTTOU, SIG_DFL); #endif #ifdef SIGTTIN signal(SIGTTIN, SIG_DFL); #endif #ifdef SIGTSTP signal(SIGTSTP, SIG_DFL); #endif signal(SIGHUP, SIG_DFL); signal(SIGPIPE, SIG_DFL); signal(SIGUSR1, SIG_DFL); } static handler_ctx * handler_ctx_init(void) { handler_ctx * hctx; hctx = calloc(1, sizeof(*hctx)); force_assert(hctx); hctx->fde_ndx = -1; hctx->response = buffer_init(); hctx->response_header = buffer_init(); hctx->request_id = 0; hctx->state = FCGI_STATE_INIT; hctx->proc = NULL; hctx->response_len = 0; hctx->response_type = 0; hctx->response_padding = 0; hctx->fd = -1; hctx->reconnects = 0; hctx->wb = chunkqueue_init(); return hctx; } static void handler_ctx_free(handler_ctx *hctx) { buffer_free(hctx->response); buffer_free(hctx->response_header); chunkqueue_free(hctx->wb); free(hctx); } static scgi_proc *scgi_process_init(void) { scgi_proc *f; f = calloc(1, sizeof(*f)); f->socket = buffer_init(); f->prev = NULL; f->next = NULL; return f; } static void scgi_process_free(scgi_proc *f) { if (!f) return; scgi_process_free(f->next); buffer_free(f->socket); free(f); } static scgi_extension_host *scgi_host_init(void) { scgi_extension_host *f; f = calloc(1, sizeof(*f)); f->host = buffer_init(); f->unixsocket = buffer_init(); f->docroot = buffer_init(); f->bin_path = buffer_init(); f->bin_env = array_init(); f->bin_env_copy = array_init(); return f; } static void scgi_host_free(scgi_extension_host *h) { if (!h) return; buffer_free(h->host); buffer_free(h->unixsocket); buffer_free(h->docroot); buffer_free(h->bin_path); array_free(h->bin_env); array_free(h->bin_env_copy); scgi_process_free(h->first); scgi_process_free(h->unused_procs); free(h); } static scgi_exts *scgi_extensions_init(void) { scgi_exts *f; f = calloc(1, sizeof(*f)); return f; } static void scgi_extensions_free(scgi_exts *f) { size_t i; if (!f) return; for (i = 0; i < f->used; i++) { scgi_extension *fe; size_t j; fe = f->exts[i]; for (j = 0; j < fe->used; j++) { scgi_extension_host *h; h = fe->hosts[j]; scgi_host_free(h); } buffer_free(fe->key); free(fe->hosts); free(fe); } free(f->exts); free(f); } static int scgi_extension_insert(scgi_exts *ext, buffer *key, scgi_extension_host *fh) { scgi_extension *fe; size_t i; /* there is something */ for (i = 0; i < ext->used; i++) { if (buffer_is_equal(key, ext->exts[i]->key)) { break; } } if (i == ext->used) { /* filextension is new */ fe = calloc(1, sizeof(*fe)); force_assert(fe); fe->key = buffer_init(); buffer_copy_buffer(fe->key, key); /* */ if (ext->size == 0) { ext->size = 8; ext->exts = malloc(ext->size * sizeof(*(ext->exts))); force_assert(ext->exts); } else if (ext->used == ext->size) { ext->size += 8; ext->exts = realloc(ext->exts, ext->size * sizeof(*(ext->exts))); force_assert(ext->exts); } ext->exts[ext->used++] = fe; } else { fe = ext->exts[i]; } if (fe->size == 0) { fe->size = 4; fe->hosts = malloc(fe->size * sizeof(*(fe->hosts))); force_assert(fe->hosts); } else if (fe->size == fe->used) { fe->size += 4; fe->hosts = realloc(fe->hosts, fe->size * sizeof(*(fe->hosts))); force_assert(fe->hosts); } fe->hosts[fe->used++] = fh; return 0; } INIT_FUNC(mod_scgi_init) { plugin_data *p; p = calloc(1, sizeof(*p)); p->scgi_env = buffer_init(); p->path = buffer_init(); p->parse_response = buffer_init(); return p; } FREE_FUNC(mod_scgi_free) { plugin_data *p = p_d; UNUSED(srv); buffer_free(p->scgi_env); buffer_free(p->path); buffer_free(p->parse_response); if (p->config_storage) { size_t i, j, n; for (i = 0; i < srv->config_context->used; i++) { plugin_config *s = p->config_storage[i]; scgi_exts *exts; if (NULL == s) continue; exts = s->exts; for (j = 0; j < exts->used; j++) { scgi_extension *ex; ex = exts->exts[j]; for (n = 0; n < ex->used; n++) { scgi_proc *proc; scgi_extension_host *host; host = ex->hosts[n]; for (proc = host->first; proc; proc = proc->next) { if (proc->pid != 0) kill(proc->pid, SIGTERM); if (proc->is_local && !buffer_string_is_empty(proc->socket)) { unlink(proc->socket->ptr); } } for (proc = host->unused_procs; proc; proc = proc->next) { if (proc->pid != 0) kill(proc->pid, SIGTERM); if (proc->is_local && !buffer_string_is_empty(proc->socket)) { unlink(proc->socket->ptr); } } } } scgi_extensions_free(s->exts); free(s); } free(p->config_storage); } free(p); return HANDLER_GO_ON; } static int env_add(char_array *env, const char *key, size_t key_len, const char *val, size_t val_len) { char *dst; size_t i; if (!key || !val) return -1; dst = malloc(key_len + val_len + 3); memcpy(dst, key, key_len); dst[key_len] = '='; /* add the \0 from the value */ memcpy(dst + key_len + 1, val, val_len + 1); for (i = 0; i < env->used; i++) { if (0 == strncmp(dst, env->ptr[i], key_len + 1)) { /* don't care about free as we are in a forked child which is going to exec(...) */ /* free(env->ptr[i]); */ env->ptr[i] = dst; return 0; } } if (env->size == 0) { env->size = 16; env->ptr = malloc(env->size * sizeof(*env->ptr)); } else if (env->size == env->used) { env->size += 16; env->ptr = realloc(env->ptr, env->size * sizeof(*env->ptr)); } env->ptr[env->used++] = dst; return 0; } static int scgi_spawn_connection(server *srv, plugin_data *p, scgi_extension_host *host, scgi_proc *proc) { int scgi_fd; int socket_type, status; struct timeval tv = { 0, 100 * 1000 }; #ifdef HAVE_SYS_UN_H struct sockaddr_un scgi_addr_un; #endif struct sockaddr_in scgi_addr_in; struct sockaddr *scgi_addr; socklen_t servlen; #ifndef HAVE_FORK return -1; #endif if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "sdb", "new proc, socket:", proc->port, proc->socket); } if (!buffer_string_is_empty(proc->socket)) { memset(&scgi_addr, 0, sizeof(scgi_addr)); #ifdef HAVE_SYS_UN_H scgi_addr_un.sun_family = AF_UNIX; if (buffer_string_length(proc->socket) + 1 > sizeof(scgi_addr_un.sun_path)) { log_error_write(srv, __FILE__, __LINE__, "sB", "ERROR: Unix Domain socket filename too long:", proc->socket); return -1; } memcpy(scgi_addr_un.sun_path, proc->socket->ptr, buffer_string_length(proc->socket) + 1); #ifdef SUN_LEN servlen = SUN_LEN(&scgi_addr_un); #else /* stevens says: */ servlen = buffer_string_length(proc->socket) + 1 + sizeof(scgi_addr_un.sun_family); #endif socket_type = AF_UNIX; scgi_addr = (struct sockaddr *) &scgi_addr_un; #else log_error_write(srv, __FILE__, __LINE__, "s", "ERROR: Unix Domain sockets are not supported."); return -1; #endif } else { scgi_addr_in.sin_family = AF_INET; if (buffer_string_is_empty(host->host)) { scgi_addr_in.sin_addr.s_addr = htonl(INADDR_ANY); } else { struct hostent *he; /* set a usefull default */ scgi_addr_in.sin_addr.s_addr = htonl(INADDR_ANY); if (NULL == (he = gethostbyname(host->host->ptr))) { log_error_write(srv, __FILE__, __LINE__, "sdb", "gethostbyname failed: ", h_errno, host->host); return -1; } if (he->h_addrtype != AF_INET) { log_error_write(srv, __FILE__, __LINE__, "sd", "addr-type != AF_INET: ", he->h_addrtype); return -1; } if (he->h_length != sizeof(struct in_addr)) { log_error_write(srv, __FILE__, __LINE__, "sd", "addr-length != sizeof(in_addr): ", he->h_length); return -1; } memcpy(&(scgi_addr_in.sin_addr.s_addr), he->h_addr_list[0], he->h_length); } scgi_addr_in.sin_port = htons(proc->port); servlen = sizeof(scgi_addr_in); socket_type = AF_INET; scgi_addr = (struct sockaddr *) &scgi_addr_in; } if (-1 == (scgi_fd = socket(socket_type, SOCK_STREAM, 0))) { log_error_write(srv, __FILE__, __LINE__, "ss", "failed:", strerror(errno)); return -1; } if (-1 == connect(scgi_fd, scgi_addr, servlen)) { /* server is not up, spawn in */ pid_t child; int val; if (!buffer_string_is_empty(proc->socket)) { unlink(proc->socket->ptr); } close(scgi_fd); /* reopen socket */ if (-1 == (scgi_fd = socket(socket_type, SOCK_STREAM, 0))) { log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno)); return -1; } val = 1; if (setsockopt(scgi_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0) { log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt failed:", strerror(errno)); close(scgi_fd); return -1; } /* create socket */ if (-1 == bind(scgi_fd, scgi_addr, servlen)) { log_error_write(srv, __FILE__, __LINE__, "sbds", "bind failed for:", proc->socket, proc->port, strerror(errno)); close(scgi_fd); return -1; } if (-1 == listen(scgi_fd, 1024)) { log_error_write(srv, __FILE__, __LINE__, "ss", "listen failed:", strerror(errno)); close(scgi_fd); return -1; } #ifdef HAVE_FORK switch ((child = fork())) { case 0: { buffer *b; size_t i = 0; int fd = 0; char_array env; /* create environment */ env.ptr = NULL; env.size = 0; env.used = 0; if (scgi_fd != 0) { dup2(scgi_fd, 0); close(scgi_fd); } /* we don't need the client socket */ for (fd = 3; fd < 256; fd++) { close(fd); } /* build clean environment */ if (host->bin_env_copy->used) { for (i = 0; i < host->bin_env_copy->used; i++) { data_string *ds = (data_string *)host->bin_env_copy->data[i]; char *ge; if (NULL != (ge = getenv(ds->value->ptr))) { env_add(&env, CONST_BUF_LEN(ds->value), ge, strlen(ge)); } } } else { for (i = 0; environ[i]; i++) { char *eq; if (NULL != (eq = strchr(environ[i], '='))) { env_add(&env, environ[i], eq - environ[i], eq+1, strlen(eq+1)); } } } /* create environment */ for (i = 0; i < host->bin_env->used; i++) { data_string *ds = (data_string *)host->bin_env->data[i]; env_add(&env, CONST_BUF_LEN(ds->key), CONST_BUF_LEN(ds->value)); } for (i = 0; i < env.used; i++) { /* search for PHP_FCGI_CHILDREN */ if (0 == strncmp(env.ptr[i], "PHP_FCGI_CHILDREN=", sizeof("PHP_FCGI_CHILDREN=") - 1)) break; } /* not found, add a default */ if (i == env.used) { env_add(&env, CONST_STR_LEN("PHP_FCGI_CHILDREN"), CONST_STR_LEN("1")); } env.ptr[env.used] = NULL; b = buffer_init(); buffer_copy_string_len(b, CONST_STR_LEN("exec ")); buffer_append_string_buffer(b, host->bin_path); reset_signals(); /* exec the cgi */ execle("/bin/sh", "sh", "-c", b->ptr, (char *)NULL, env.ptr); log_error_write(srv, __FILE__, __LINE__, "sbs", "execl failed for:", host->bin_path, strerror(errno)); exit(errno); break; } case -1: /* error */ break; default: /* father */ /* wait */ select(0, NULL, NULL, NULL, &tv); switch (waitpid(child, &status, WNOHANG)) { case 0: /* child still running after timeout, good */ break; case -1: /* no PID found ? should never happen */ log_error_write(srv, __FILE__, __LINE__, "ss", "pid not found:", strerror(errno)); return -1; default: /* the child should not terminate at all */ if (WIFEXITED(status)) { log_error_write(srv, __FILE__, __LINE__, "sd", "child exited (is this a SCGI binary ?):", WEXITSTATUS(status)); } else if (WIFSIGNALED(status)) { log_error_write(srv, __FILE__, __LINE__, "sd", "child signaled:", WTERMSIG(status)); } else { log_error_write(srv, __FILE__, __LINE__, "sd", "child died somehow:", status); } return -1; } /* register process */ proc->pid = child; proc->last_used = srv->cur_ts; proc->is_local = 1; break; } #endif } else { proc->is_local = 0; proc->pid = 0; if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "sb", "(debug) socket is already used, won't spawn:", proc->socket); } } proc->state = PROC_STATE_RUNNING; host->active_procs++; close(scgi_fd); return 0; } SETDEFAULTS_FUNC(mod_scgi_set_defaults) { plugin_data *p = p_d; data_unset *du; size_t i = 0; scgi_extension_host *df = NULL; config_values_t cv[] = { { "scgi.server", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 0 */ { "scgi.debug", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 1 */ { NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET } }; p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *)); for (i = 0; i < srv->config_context->used; i++) { plugin_config *s; array *ca; s = malloc(sizeof(plugin_config)); s->exts = scgi_extensions_init(); s->debug = 0; cv[0].destination = s->exts; cv[1].destination = &(s->debug); p->config_storage[i] = s; ca = ((data_config *)srv->config_context->data[i])->value; if (0 != config_insert_values_global(srv, ca, cv)) { goto error; } /* * = ( ... ) */ if (NULL != (du = array_get_element(ca, "scgi.server"))) { size_t j; data_array *da = (data_array *)du; if (du->type != TYPE_ARRAY) { log_error_write(srv, __FILE__, __LINE__, "sss", "unexpected type for key: ", "scgi.server", "array of strings"); goto error; } /* * scgi.server = ( "" => ( ... ), * "" => ( ... ) ) */ for (j = 0; j < da->value->used; j++) { size_t n; data_array *da_ext = (data_array *)da->value->data[j]; if (da->value->data[j]->type != TYPE_ARRAY) { log_error_write(srv, __FILE__, __LINE__, "sssbs", "unexpected type for key: ", "scgi.server", "[", da->value->data[j]->key, "](string)"); goto error; } /* * da_ext->key == name of the extension */ /* * scgi.server = ( "" => * ( "" => ( ... ), * "" => ( ... ) * ), * "" => ... ) */ for (n = 0; n < da_ext->value->used; n++) { data_array *da_host = (data_array *)da_ext->value->data[n]; config_values_t fcv[] = { { "host", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, /* 0 */ { "docroot", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, /* 1 */ { "socket", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, /* 2 */ { "bin-path", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, /* 3 */ { "check-local", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 4 */ { "port", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 5 */ { "min-procs-not-working", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 7 this is broken for now */ { "max-procs", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 7 */ { "max-load-per-proc", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 8 */ { "idle-timeout", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 9 */ { "disable-time", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 10 */ { "bin-environment", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, /* 11 */ { "bin-copy-environment", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, /* 12 */ { "fix-root-scriptname", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 13 */ { NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET } }; if (da_host->type != TYPE_ARRAY) { log_error_write(srv, __FILE__, __LINE__, "ssSBS", "unexpected type for key:", "scgi.server", "[", da_host->key, "](string)"); goto error; } df = scgi_host_init(); df->check_local = 1; df->min_procs = 4; df->max_procs = 4; df->max_load_per_proc = 1; df->idle_timeout = 60; df->disable_time = 60; df->fix_root_path_name = 0; fcv[0].destination = df->host; fcv[1].destination = df->docroot; fcv[2].destination = df->unixsocket; fcv[3].destination = df->bin_path; fcv[4].destination = &(df->check_local); fcv[5].destination = &(df->port); fcv[6].destination = &(df->min_procs); fcv[7].destination = &(df->max_procs); fcv[8].destination = &(df->max_load_per_proc); fcv[9].destination = &(df->idle_timeout); fcv[10].destination = &(df->disable_time); fcv[11].destination = df->bin_env; fcv[12].destination = df->bin_env_copy; fcv[13].destination = &(df->fix_root_path_name); if (0 != config_insert_values_internal(srv, da_host->value, fcv)) { goto error; } if ((!buffer_string_is_empty(df->host) || df->port) && !buffer_string_is_empty(df->unixsocket)) { log_error_write(srv, __FILE__, __LINE__, "s", "either host+port or socket"); goto error; } if (!buffer_string_is_empty(df->unixsocket)) { /* unix domain socket */ struct sockaddr_un un; if (buffer_string_length(df->unixsocket) + 1 > sizeof(un.sun_path) - 2) { log_error_write(srv, __FILE__, __LINE__, "s", "path of the unixdomain socket is too large"); goto error; } } else { /* tcp/ip */ if (buffer_string_is_empty(df->host) && buffer_string_is_empty(df->bin_path)) { log_error_write(srv, __FILE__, __LINE__, "sbbbs", "missing key (string):", da->key, da_ext->key, da_host->key, "host"); goto error; } else if (df->port == 0) { log_error_write(srv, __FILE__, __LINE__, "sbbbs", "missing key (short):", da->key, da_ext->key, da_host->key, "port"); goto error; } } if (!buffer_string_is_empty(df->bin_path)) { /* a local socket + self spawning */ size_t pno; /* HACK: just to make sure the adaptive spawing is disabled */ df->min_procs = df->max_procs; if (df->min_procs > df->max_procs) df->max_procs = df->min_procs; if (df->max_load_per_proc < 1) df->max_load_per_proc = 0; if (s->debug) { log_error_write(srv, __FILE__, __LINE__, "ssbsdsbsdsd", "--- scgi spawning local", "\n\tproc:", df->bin_path, "\n\tport:", df->port, "\n\tsocket", df->unixsocket, "\n\tmin-procs:", df->min_procs, "\n\tmax-procs:", df->max_procs); } for (pno = 0; pno < df->min_procs; pno++) { scgi_proc *proc; proc = scgi_process_init(); proc->id = df->num_procs++; df->max_id++; if (buffer_string_is_empty(df->unixsocket)) { proc->port = df->port + pno; } else { buffer_copy_buffer(proc->socket, df->unixsocket); buffer_append_string_len(proc->socket, CONST_STR_LEN("-")); buffer_append_int(proc->socket, pno); } if (s->debug) { log_error_write(srv, __FILE__, __LINE__, "ssdsbsdsd", "--- scgi spawning", "\n\tport:", df->port, "\n\tsocket", df->unixsocket, "\n\tcurrent:", pno, "/", df->min_procs); } if (scgi_spawn_connection(srv, p, df, proc)) { log_error_write(srv, __FILE__, __LINE__, "s", "[ERROR]: spawning fcgi failed."); scgi_process_free(proc); goto error; } proc->next = df->first; if (df->first) df->first->prev = proc; df->first = proc; } } else { scgi_proc *fp; fp = scgi_process_init(); fp->id = df->num_procs++; df->max_id++; df->active_procs++; fp->state = PROC_STATE_RUNNING; if (buffer_string_is_empty(df->unixsocket)) { fp->port = df->port; } else { buffer_copy_buffer(fp->socket, df->unixsocket); } df->first = fp; df->min_procs = 1; df->max_procs = 1; } /* if extension already exists, take it */ scgi_extension_insert(s->exts, da_ext->key, df); df = NULL; } } } } return HANDLER_GO_ON; error: if (NULL != df) scgi_host_free(df); return HANDLER_ERROR; } static int scgi_set_state(server *srv, handler_ctx *hctx, scgi_connection_state_t state) { hctx->state = state; hctx->state_timestamp = srv->cur_ts; return 0; } static void scgi_connection_cleanup(server *srv, handler_ctx *hctx) { plugin_data *p; connection *con; if (NULL == hctx) return; p = hctx->plugin_data; con = hctx->remote_conn; if (hctx->fd != -1) { fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd); fdevent_unregister(srv->ev, hctx->fd); close(hctx->fd); srv->cur_fds--; } if (hctx->host && hctx->proc) { hctx->host->load--; if (hctx->got_proc) { /* after the connect the process gets a load */ hctx->proc->load--; if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "sddb", "release proc:", hctx->fd, hctx->proc->pid, hctx->proc->socket); } } scgi_proclist_sort_down(srv, hctx->host, hctx->proc); } handler_ctx_free(hctx); con->plugin_ctx[p->id] = NULL; } static int scgi_reconnect(server *srv, handler_ctx *hctx) { plugin_data *p = hctx->plugin_data; /* child died * * 1. * * connect was ok, connection was accepted * but the php accept loop checks after the accept if it should die or not. * * if yes we can only detect it at a write() * * next step is resetting this attemp and setup a connection again * * if we have more then 5 reconnects for the same request, die * * 2. * * we have a connection but the child died by some other reason * */ fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd); fdevent_unregister(srv->ev, hctx->fd); close(hctx->fd); srv->cur_fds--; scgi_set_state(srv, hctx, FCGI_STATE_INIT); hctx->request_id = 0; hctx->reconnects++; if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "sddb", "release proc:", hctx->fd, hctx->proc->pid, hctx->proc->socket); } hctx->proc->load--; scgi_proclist_sort_down(srv, hctx->host, hctx->proc); return 0; } static handler_t scgi_connection_reset(server *srv, connection *con, void *p_d) { plugin_data *p = p_d; scgi_connection_cleanup(srv, con->plugin_ctx[p->id]); return HANDLER_GO_ON; } static int scgi_env_add(buffer *env, const char *key, size_t key_len, const char *val, size_t val_len) { size_t len; if (!key || !val) return -1; len = key_len + val_len + 2; buffer_string_prepare_append(env, len); buffer_append_string_len(env, key, key_len); buffer_append_string_len(env, "", 1); buffer_append_string_len(env, val, val_len); buffer_append_string_len(env, "", 1); return 0; } /** * * returns * -1 error * 0 connected * 1 not connected yet */ static int scgi_establish_connection(server *srv, handler_ctx *hctx) { struct sockaddr *scgi_addr; struct sockaddr_in scgi_addr_in; #ifdef HAVE_SYS_UN_H struct sockaddr_un scgi_addr_un; #endif socklen_t servlen; scgi_extension_host *host = hctx->host; scgi_proc *proc = hctx->proc; int scgi_fd = hctx->fd; memset(&scgi_addr, 0, sizeof(scgi_addr)); if (!buffer_string_is_empty(proc->socket)) { #ifdef HAVE_SYS_UN_H /* use the unix domain socket */ scgi_addr_un.sun_family = AF_UNIX; if (buffer_string_length(proc->socket) + 1 > sizeof(scgi_addr_un.sun_path)) { log_error_write(srv, __FILE__, __LINE__, "sB", "ERROR: Unix Domain socket filename too long:", proc->socket); return -1; } memcpy(scgi_addr_un.sun_path, proc->socket->ptr, buffer_string_length(proc->socket) + 1); #ifdef SUN_LEN servlen = SUN_LEN(&scgi_addr_un); #else /* stevens says: */ servlen = buffer_string_length(proc->socket) + 1 + sizeof(scgi_addr_un.sun_family); #endif scgi_addr = (struct sockaddr *) &scgi_addr_un; #else return -1; #endif } else { scgi_addr_in.sin_family = AF_INET; if (0 == inet_aton(host->host->ptr, &(scgi_addr_in.sin_addr))) { log_error_write(srv, __FILE__, __LINE__, "sbs", "converting IP-adress failed for", host->host, "\nBe sure to specify an IP address here"); return -1; } scgi_addr_in.sin_port = htons(proc->port); servlen = sizeof(scgi_addr_in); scgi_addr = (struct sockaddr *) &scgi_addr_in; } if (-1 == connect(scgi_fd, scgi_addr, servlen)) { if (errno == EINPROGRESS || errno == EALREADY || errno == EINTR) { if (hctx->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "sd", "connect delayed, will continue later:", scgi_fd); } return 1; } else { log_error_write(srv, __FILE__, __LINE__, "sdsddb", "connect failed:", scgi_fd, strerror(errno), errno, proc->port, proc->socket); if (errno == EAGAIN) { /* this is Linux only */ log_error_write(srv, __FILE__, __LINE__, "s", "If this happend on Linux: You have been run out of local ports. " "Check the manual, section Performance how to handle this."); } return -1; } } if (hctx->conf.debug > 1) { log_error_write(srv, __FILE__, __LINE__, "sd", "connect succeeded: ", scgi_fd); } return 0; } static int scgi_env_add_request_headers(server *srv, connection *con, plugin_data *p) { size_t i; for (i = 0; i < con->request.headers->used; i++) { data_string *ds; ds = (data_string *)con->request.headers->data[i]; if (!buffer_is_empty(ds->value) && !buffer_is_empty(ds->key)) { buffer_copy_string_encoded_cgi_varnames(srv->tmp_buf, CONST_BUF_LEN(ds->key), 1); scgi_env_add(p->scgi_env, CONST_BUF_LEN(srv->tmp_buf), CONST_BUF_LEN(ds->value)); } } for (i = 0; i < con->environment->used; i++) { data_string *ds; ds = (data_string *)con->environment->data[i]; if (!buffer_is_empty(ds->value) && !buffer_is_empty(ds->key)) { buffer_copy_string_encoded_cgi_varnames(srv->tmp_buf, CONST_BUF_LEN(ds->key), 0); scgi_env_add(p->scgi_env, CONST_BUF_LEN(srv->tmp_buf), CONST_BUF_LEN(ds->value)); } } return 0; } static int scgi_create_env(server *srv, handler_ctx *hctx) { char buf[LI_ITOSTRING_LENGTH]; const char *s; #ifdef HAVE_IPV6 char b2[INET6_ADDRSTRLEN + 1]; #endif buffer *b; plugin_data *p = hctx->plugin_data; scgi_extension_host *host= hctx->host; connection *con = hctx->remote_conn; server_socket *srv_sock = con->srv_socket; sock_addr our_addr; socklen_t our_addr_len; buffer_string_prepare_copy(p->scgi_env, 1023); /* CGI-SPEC 6.1.2, FastCGI spec 6.3 and SCGI spec */ li_itostr(buf, con->request.content_length); scgi_env_add(p->scgi_env, CONST_STR_LEN("CONTENT_LENGTH"), buf, strlen(buf)); scgi_env_add(p->scgi_env, CONST_STR_LEN("SCGI"), CONST_STR_LEN("1")); if (buffer_is_empty(con->conf.server_tag)) { scgi_env_add(p->scgi_env, CONST_STR_LEN("SERVER_SOFTWARE"), CONST_STR_LEN(PACKAGE_DESC)); } else { scgi_env_add(p->scgi_env, CONST_STR_LEN("SERVER_SOFTWARE"), CONST_BUF_LEN(con->conf.server_tag)); } if (!buffer_is_empty(con->server_name)) { size_t len = buffer_string_length(con->server_name); if (con->server_name->ptr[0] == '[') { const char *colon = strstr(con->server_name->ptr, "]:"); if (colon) len = (colon + 1) - con->server_name->ptr; } else { const char *colon = strchr(con->server_name->ptr, ':'); if (colon) len = colon - con->server_name->ptr; } scgi_env_add(p->scgi_env, CONST_STR_LEN("SERVER_NAME"), con->server_name->ptr, len); } else { #ifdef HAVE_IPV6 s = inet_ntop(srv_sock->addr.plain.sa_family, srv_sock->addr.plain.sa_family == AF_INET6 ? (const void *) &(srv_sock->addr.ipv6.sin6_addr) : (const void *) &(srv_sock->addr.ipv4.sin_addr), b2, sizeof(b2)-1); #else s = inet_ntoa(srv_sock->addr.ipv4.sin_addr); #endif scgi_env_add(p->scgi_env, CONST_STR_LEN("SERVER_NAME"), s, strlen(s)); } scgi_env_add(p->scgi_env, CONST_STR_LEN("GATEWAY_INTERFACE"), CONST_STR_LEN("CGI/1.1")); li_utostr(buf, #ifdef HAVE_IPV6 ntohs(srv_sock->addr.plain.sa_family ? srv_sock->addr.ipv6.sin6_port : srv_sock->addr.ipv4.sin_port) #else ntohs(srv_sock->addr.ipv4.sin_port) #endif ); scgi_env_add(p->scgi_env, CONST_STR_LEN("SERVER_PORT"), buf, strlen(buf)); /* get the server-side of the connection to the client */ our_addr_len = sizeof(our_addr); if (-1 == getsockname(con->fd, &(our_addr.plain), &our_addr_len)) { s = inet_ntop_cache_get_ip(srv, &(srv_sock->addr)); } else { s = inet_ntop_cache_get_ip(srv, &(our_addr)); } scgi_env_add(p->scgi_env, CONST_STR_LEN("SERVER_ADDR"), s, strlen(s)); li_utostr(buf, #ifdef HAVE_IPV6 ntohs(con->dst_addr.plain.sa_family ? con->dst_addr.ipv6.sin6_port : con->dst_addr.ipv4.sin_port) #else ntohs(con->dst_addr.ipv4.sin_port) #endif ); scgi_env_add(p->scgi_env, CONST_STR_LEN("REMOTE_PORT"), buf, strlen(buf)); s = inet_ntop_cache_get_ip(srv, &(con->dst_addr)); scgi_env_add(p->scgi_env, CONST_STR_LEN("REMOTE_ADDR"), s, strlen(s)); /* * SCRIPT_NAME, PATH_INFO and PATH_TRANSLATED according to * http://cgi-spec.golux.com/draft-coar-cgi-v11-03-clean.html * (6.1.14, 6.1.6, 6.1.7) */ scgi_env_add(p->scgi_env, CONST_STR_LEN("SCRIPT_NAME"), CONST_BUF_LEN(con->uri.path)); if (!buffer_string_is_empty(con->request.pathinfo)) { scgi_env_add(p->scgi_env, CONST_STR_LEN("PATH_INFO"), CONST_BUF_LEN(con->request.pathinfo)); /* PATH_TRANSLATED is only defined if PATH_INFO is set */ if (!buffer_string_is_empty(host->docroot)) { buffer_copy_buffer(p->path, host->docroot); } else { buffer_copy_buffer(p->path, con->physical.basedir); } buffer_append_string_buffer(p->path, con->request.pathinfo); scgi_env_add(p->scgi_env, CONST_STR_LEN("PATH_TRANSLATED"), CONST_BUF_LEN(p->path)); } else { scgi_env_add(p->scgi_env, CONST_STR_LEN("PATH_INFO"), CONST_STR_LEN("")); } /* * SCRIPT_FILENAME and DOCUMENT_ROOT for php. The PHP manual * http://www.php.net/manual/en/reserved.variables.php * treatment of PATH_TRANSLATED is different from the one of CGI specs. * TODO: this code should be checked against cgi.fix_pathinfo php * parameter. */ if (!buffer_string_is_empty(host->docroot)) { /* * rewrite SCRIPT_FILENAME * */ buffer_copy_buffer(p->path, host->docroot); buffer_append_string_buffer(p->path, con->uri.path); scgi_env_add(p->scgi_env, CONST_STR_LEN("SCRIPT_FILENAME"), CONST_BUF_LEN(p->path)); scgi_env_add(p->scgi_env, CONST_STR_LEN("DOCUMENT_ROOT"), CONST_BUF_LEN(host->docroot)); } else { buffer_copy_buffer(p->path, con->physical.path); scgi_env_add(p->scgi_env, CONST_STR_LEN("SCRIPT_FILENAME"), CONST_BUF_LEN(p->path)); scgi_env_add(p->scgi_env, CONST_STR_LEN("DOCUMENT_ROOT"), CONST_BUF_LEN(con->physical.basedir)); } scgi_env_add(p->scgi_env, CONST_STR_LEN("REQUEST_URI"), CONST_BUF_LEN(con->request.orig_uri)); if (!buffer_is_equal(con->request.uri, con->request.orig_uri)) { scgi_env_add(p->scgi_env, CONST_STR_LEN("REDIRECT_URI"), CONST_BUF_LEN(con->request.uri)); } if (!buffer_string_is_empty(con->uri.query)) { scgi_env_add(p->scgi_env, CONST_STR_LEN("QUERY_STRING"), CONST_BUF_LEN(con->uri.query)); } else { scgi_env_add(p->scgi_env, CONST_STR_LEN("QUERY_STRING"), CONST_STR_LEN("")); } s = get_http_method_name(con->request.http_method); scgi_env_add(p->scgi_env, CONST_STR_LEN("REQUEST_METHOD"), s, strlen(s)); scgi_env_add(p->scgi_env, CONST_STR_LEN("REDIRECT_STATUS"), CONST_STR_LEN("200")); /* if php is compiled with --force-redirect */ s = get_http_version_name(con->request.http_version); scgi_env_add(p->scgi_env, CONST_STR_LEN("SERVER_PROTOCOL"), s, strlen(s)); #ifdef USE_OPENSSL if (buffer_is_equal_caseless_string(con->uri.scheme, CONST_STR_LEN("https"))) { scgi_env_add(p->scgi_env, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on")); } #endif scgi_env_add_request_headers(srv, con, p); b = buffer_init(); buffer_append_int(b, buffer_string_length(p->scgi_env)); buffer_append_string_len(b, CONST_STR_LEN(":")); buffer_append_string_buffer(b, p->scgi_env); buffer_append_string_len(b, CONST_STR_LEN(",")); hctx->wb->bytes_in += buffer_string_length(b); chunkqueue_append_buffer(hctx->wb, b); buffer_free(b); if (con->request.content_length) { chunkqueue *req_cq = con->request_content_queue; chunkqueue_steal(hctx->wb, req_cq, req_cq->bytes_in); } return 0; } static int scgi_response_parse(server *srv, connection *con, plugin_data *p, buffer *in, int eol) { char *ns; const char *s; int line = 0; UNUSED(srv); buffer_copy_buffer(p->parse_response, in); for (s = p->parse_response->ptr; NULL != (ns = (eol == EOL_RN ? strstr(s, "\r\n") : strchr(s, '\n'))); s = ns + (eol == EOL_RN ? 2 : 1), line++) { const char *key, *value; int key_len; data_string *ds; ns[0] = '\0'; if (line == 0 && 0 == strncmp(s, "HTTP/1.", 7)) { /* non-parsed header ... we parse them anyway */ if ((s[7] == '1' || s[7] == '0') && s[8] == ' ') { int status; /* after the space should be a status code for us */ status = strtol(s+9, NULL, 10); if (status >= 100 && status < 1000) { /* we expected 3 digits got them */ con->parsed_response |= HTTP_STATUS; con->http_status = status; } } } else { key = s; if (NULL == (value = strchr(s, ':'))) { /* we expect: ": \r\n" */ continue; } key_len = value - key; value += 1; /* skip LWS */ while (*value == ' ' || *value == '\t') value++; if (NULL == (ds = (data_string *)array_get_unused_element(con->response.headers, TYPE_STRING))) { ds = data_response_init(); } buffer_copy_string_len(ds->key, key, key_len); buffer_copy_string(ds->value, value); array_insert_unique(con->response.headers, (data_unset *)ds); switch(key_len) { case 4: if (0 == strncasecmp(key, "Date", key_len)) { con->parsed_response |= HTTP_DATE; } break; case 6: if (0 == strncasecmp(key, "Status", key_len)) { con->http_status = strtol(value, NULL, 10); con->parsed_response |= HTTP_STATUS; } break; case 8: if (0 == strncasecmp(key, "Location", key_len)) { con->parsed_response |= HTTP_LOCATION; } break; case 10: if (0 == strncasecmp(key, "Connection", key_len)) { con->response.keep_alive = (0 == strcasecmp(value, "Keep-Alive")) ? 1 : 0; con->parsed_response |= HTTP_CONNECTION; } break; case 14: if (0 == strncasecmp(key, "Content-Length", key_len)) { con->response.content_length = strtol(value, NULL, 10); con->parsed_response |= HTTP_CONTENT_LENGTH; } break; default: break; } } } /* CGI/1.1 rev 03 - 7.2.1.2 */ if ((con->parsed_response & HTTP_LOCATION) && !(con->parsed_response & HTTP_STATUS)) { con->http_status = 302; } return 0; } static int scgi_demux_response(server *srv, handler_ctx *hctx) { plugin_data *p = hctx->plugin_data; connection *con = hctx->remote_conn; while(1) { int n; buffer_string_prepare_copy(hctx->response, 1023); if (-1 == (n = read(hctx->fd, hctx->response->ptr, hctx->response->size - 1))) { if (errno == EAGAIN || errno == EINTR) { /* would block, wait for signal */ return 0; } /* error */ log_error_write(srv, __FILE__, __LINE__, "sdd", strerror(errno), con->fd, hctx->fd); return -1; } if (n == 0) { /* read finished */ con->file_finished = 1; /* send final chunk */ http_chunk_close(srv, con); joblist_append(srv, con); return 1; } buffer_commit(hctx->response, n); /* split header from body */ if (con->file_started == 0) { char *c; int in_header = 0; int header_end = 0; int cp, eol = EOL_UNSET; size_t used = 0; size_t hlen = 0; buffer_append_string_buffer(hctx->response_header, hctx->response); /* nph (non-parsed headers) */ if (0 == strncmp(hctx->response_header->ptr, "HTTP/1.", 7)) in_header = 1; /* search for the \r\n\r\n or \n\n in the string */ for (c = hctx->response_header->ptr, cp = 0, used = buffer_string_length(hctx->response_header); used; c++, cp++, used--) { if (*c == ':') in_header = 1; else if (*c == '\n') { if (in_header == 0) { /* got a response without a response header */ c = NULL; header_end = 1; break; } if (eol == EOL_UNSET) eol = EOL_N; if (*(c+1) == '\n') { header_end = 1; hlen = cp + 2; break; } } else if (used > 1 && *c == '\r' && *(c+1) == '\n') { if (in_header == 0) { /* got a response without a response header */ c = NULL; header_end = 1; break; } if (eol == EOL_UNSET) eol = EOL_RN; if (used > 3 && *(c+2) == '\r' && *(c+3) == '\n') { header_end = 1; hlen = cp + 4; break; } /* skip the \n */ c++; cp++; used--; } } if (header_end) { if (c == NULL) { /* no header, but a body */ if (con->request.http_version == HTTP_VERSION_1_1) { con->response.transfer_encoding = HTTP_TRANSFER_ENCODING_CHUNKED; } http_chunk_append_buffer(srv, con, hctx->response_header); joblist_append(srv, con); } else { size_t blen = buffer_string_length(hctx->response_header) - hlen; /* a small hack: terminate after at the second \r */ buffer_string_set_length(hctx->response_header, hlen - 1); /* parse the response header */ scgi_response_parse(srv, con, p, hctx->response_header, eol); /* enable chunked-transfer-encoding */ if (con->request.http_version == HTTP_VERSION_1_1 && !(con->parsed_response & HTTP_CONTENT_LENGTH)) { con->response.transfer_encoding = HTTP_TRANSFER_ENCODING_CHUNKED; } if (blen > 0) { http_chunk_append_mem(srv, con, hctx->response_header->ptr + hlen, blen); joblist_append(srv, con); } } con->file_started = 1; } } else { http_chunk_append_buffer(srv, con, hctx->response); joblist_append(srv, con); } #if 0 log_error_write(srv, __FILE__, __LINE__, "ddss", con->fd, hctx->fd, connection_get_state(con->state), b->ptr); #endif } return 0; } static int scgi_proclist_sort_up(server *srv, scgi_extension_host *host, scgi_proc *proc) { scgi_proc *p; UNUSED(srv); /* we have been the smallest of the current list * and we want to insert the node sorted as soon * possible * * 1 0 0 0 1 1 1 * | ^ * | | * +------+ * */ /* nothing to sort, only one element */ if (host->first == proc && proc->next == NULL) return 0; for (p = proc; p->next && p->next->load < proc->load; p = p->next); /* no need to move something * * 1 2 2 2 3 3 3 * ^ * | * + * */ if (p == proc) return 0; if (host->first == proc) { /* we have been the first elememt */ host->first = proc->next; host->first->prev = NULL; } /* disconnect proc */ if (proc->prev) proc->prev->next = proc->next; if (proc->next) proc->next->prev = proc->prev; /* proc should be right of p */ proc->next = p->next; proc->prev = p; if (p->next) p->next->prev = proc; p->next = proc; #if 0 for(p = host->first; p; p = p->next) { log_error_write(srv, __FILE__, __LINE__, "dd", p->pid, p->load); } #else UNUSED(srv); #endif return 0; } int scgi_proclist_sort_down(server *srv, scgi_extension_host *host, scgi_proc *proc) { scgi_proc *p; UNUSED(srv); /* we have been the smallest of the current list * and we want to insert the node sorted as soon * possible * * 0 0 0 0 1 0 1 * ^ | * | | * +----------+ * * * the basic is idea is: * - the last active scgi process should be still * in ram and is not swapped out yet * - processes that are not reused will be killed * after some time by the trigger-handler * - remember it as: * everything > 0 is hot * all unused procs are colder the more right they are * ice-cold processes are propably unused since more * than 'unused-timeout', are swaped out and won't be * reused in the next seconds anyway. * */ /* nothing to sort, only one element */ if (host->first == proc && proc->next == NULL) return 0; for (p = host->first; p != proc && p->load < proc->load; p = p->next); /* no need to move something * * 1 2 2 2 3 3 3 * ^ * | * + * */ if (p == proc) return 0; /* we have to move left. If we are already the first element * we are done */ if (host->first == proc) return 0; /* release proc */ if (proc->prev) proc->prev->next = proc->next; if (proc->next) proc->next->prev = proc->prev; /* proc should be left of p */ proc->next = p; proc->prev = p->prev; if (p->prev) p->prev->next = proc; p->prev = proc; if (proc->prev == NULL) host->first = proc; #if 0 for(p = host->first; p; p = p->next) { log_error_write(srv, __FILE__, __LINE__, "dd", p->pid, p->load); } #else UNUSED(srv); #endif return 0; } static int scgi_restart_dead_procs(server *srv, plugin_data *p, scgi_extension_host *host) { scgi_proc *proc; for (proc = host->first; proc; proc = proc->next) { if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "sbdbdddd", "proc:", host->host, proc->port, proc->socket, proc->state, proc->is_local, proc->load, proc->pid); } if (0 == proc->is_local) { /* * external servers might get disabled * * enable the server again, perhaps it is back again */ if ((proc->state == PROC_STATE_DISABLED) && (srv->cur_ts - proc->disable_ts > host->disable_time)) { proc->state = PROC_STATE_RUNNING; host->active_procs++; log_error_write(srv, __FILE__, __LINE__, "sbdb", "fcgi-server re-enabled:", host->host, host->port, host->unixsocket); } } else { /* the child should not terminate at all */ int status; if (proc->state == PROC_STATE_DIED_WAIT_FOR_PID) { switch(waitpid(proc->pid, &status, WNOHANG)) { case 0: /* child is still alive */ break; case -1: break; default: if (WIFEXITED(status)) { #if 0 log_error_write(srv, __FILE__, __LINE__, "sdsd", "child exited, pid:", proc->pid, "status:", WEXITSTATUS(status)); #endif } else if (WIFSIGNALED(status)) { log_error_write(srv, __FILE__, __LINE__, "sd", "child signaled:", WTERMSIG(status)); } else { log_error_write(srv, __FILE__, __LINE__, "sd", "child died somehow:", status); } proc->state = PROC_STATE_DIED; break; } } /* * local servers might died, but we restart them * */ if (proc->state == PROC_STATE_DIED && proc->load == 0) { /* restart the child */ if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "ssdsbsdsd", "--- scgi spawning", "\n\tport:", host->port, "\n\tsocket", host->unixsocket, "\n\tcurrent:", 1, "/", host->min_procs); } if (scgi_spawn_connection(srv, p, host, proc)) { log_error_write(srv, __FILE__, __LINE__, "s", "ERROR: spawning fcgi failed."); return HANDLER_ERROR; } scgi_proclist_sort_down(srv, host, proc); } } } return 0; } static handler_t scgi_write_request(server *srv, handler_ctx *hctx) { plugin_data *p = hctx->plugin_data; scgi_extension_host *host= hctx->host; connection *con = hctx->remote_conn; int ret; /* sanity check */ if (!host) { log_error_write(srv, __FILE__, __LINE__, "s", "fatal error: host = NULL"); return HANDLER_ERROR; } if (((buffer_string_is_empty(host->host) || !host->port) && buffer_string_is_empty(host->unixsocket))) { log_error_write(srv, __FILE__, __LINE__, "sxddd", "write-req: error", host, buffer_string_length(host->host), host->port, buffer_string_length(host->unixsocket)); return HANDLER_ERROR; } switch(hctx->state) { case FCGI_STATE_INIT: ret = buffer_string_is_empty(host->unixsocket) ? AF_INET : AF_UNIX; if (-1 == (hctx->fd = socket(ret, SOCK_STREAM, 0))) { if (errno == EMFILE || errno == EINTR) { log_error_write(srv, __FILE__, __LINE__, "sd", "wait for fd at connection:", con->fd); return HANDLER_WAIT_FOR_FD; } log_error_write(srv, __FILE__, __LINE__, "ssdd", "socket failed:", strerror(errno), srv->cur_fds, srv->max_fds); return HANDLER_ERROR; } hctx->fde_ndx = -1; srv->cur_fds++; fdevent_register(srv->ev, hctx->fd, scgi_handle_fdevent, hctx); if (-1 == fdevent_fcntl_set(srv->ev, hctx->fd)) { log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl failed: ", strerror(errno)); return HANDLER_ERROR; } /* fall through */ case FCGI_STATE_CONNECT: if (hctx->state == FCGI_STATE_INIT) { for (hctx->proc = hctx->host->first; hctx->proc && hctx->proc->state != PROC_STATE_RUNNING; hctx->proc = hctx->proc->next); /* all childs are dead */ if (hctx->proc == NULL) { hctx->fde_ndx = -1; return HANDLER_ERROR; } if (hctx->proc->is_local) { hctx->pid = hctx->proc->pid; } switch (scgi_establish_connection(srv, hctx)) { case 1: scgi_set_state(srv, hctx, FCGI_STATE_CONNECT); /* connection is in progress, wait for an event and call getsockopt() below */ fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_OUT); return HANDLER_WAIT_FOR_EVENT; case -1: /* if ECONNREFUSED choose another connection -> FIXME */ hctx->fde_ndx = -1; return HANDLER_ERROR; default: /* everything is ok, go on */ break; } } else { int socket_error; socklen_t socket_error_len = sizeof(socket_error); /* try to finish the connect() */ if (0 != getsockopt(hctx->fd, SOL_SOCKET, SO_ERROR, &socket_error, &socket_error_len)) { log_error_write(srv, __FILE__, __LINE__, "ss", "getsockopt failed:", strerror(errno)); return HANDLER_ERROR; } if (socket_error != 0) { if (!hctx->proc->is_local || p->conf.debug) { /* local procs get restarted */ log_error_write(srv, __FILE__, __LINE__, "ss", "establishing connection failed:", strerror(socket_error), "port:", hctx->proc->port); } return HANDLER_ERROR; } } /* ok, we have the connection */ hctx->proc->load++; hctx->proc->last_used = srv->cur_ts; hctx->got_proc = 1; if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "sddbdd", "got proc:", hctx->fd, hctx->proc->pid, hctx->proc->socket, hctx->proc->port, hctx->proc->load); } /* move the proc-list entry down the list */ scgi_proclist_sort_up(srv, hctx->host, hctx->proc); scgi_set_state(srv, hctx, FCGI_STATE_PREPARE_WRITE); /* fall through */ case FCGI_STATE_PREPARE_WRITE: scgi_create_env(srv, hctx); scgi_set_state(srv, hctx, FCGI_STATE_WRITE); /* fall through */ case FCGI_STATE_WRITE: ret = srv->network_backend_write(srv, con, hctx->fd, hctx->wb, MAX_WRITE_LIMIT); chunkqueue_remove_finished_chunks(hctx->wb); if (ret < 0) { if (errno == ENOTCONN || ret == -2) { /* the connection got dropped after accept() * * this is most of the time a PHP which dies * after PHP_FCGI_MAX_REQUESTS * */ if (hctx->wb->bytes_out == 0 && hctx->reconnects < 5) { usleep(10000); /* take away the load of the webserver * to let the php a chance to restart */ scgi_reconnect(srv, hctx); return HANDLER_WAIT_FOR_FD; } /* not reconnected ... why * * far@#lighttpd report this for FreeBSD * */ log_error_write(srv, __FILE__, __LINE__, "ssosd", "connection was dropped after accept(). reconnect() denied:", "write-offset:", hctx->wb->bytes_out, "reconnect attempts:", hctx->reconnects); return HANDLER_ERROR; } else { /* -1 == ret => error on our side */ log_error_write(srv, __FILE__, __LINE__, "ssd", "write failed:", strerror(errno), errno); return HANDLER_ERROR; } } if (hctx->wb->bytes_out == hctx->wb->bytes_in) { /* we don't need the out event anymore */ fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd); fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN); scgi_set_state(srv, hctx, FCGI_STATE_READ); } else { fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_OUT); return HANDLER_WAIT_FOR_EVENT; } break; case FCGI_STATE_READ: /* waiting for a response */ break; default: log_error_write(srv, __FILE__, __LINE__, "s", "(debug) unknown state"); return HANDLER_ERROR; } return HANDLER_WAIT_FOR_EVENT; } SUBREQUEST_FUNC(mod_scgi_handle_subrequest) { plugin_data *p = p_d; handler_ctx *hctx = con->plugin_ctx[p->id]; scgi_proc *proc; scgi_extension_host *host; if (NULL == hctx) return HANDLER_GO_ON; /* not my job */ if (con->mode != p->id) return HANDLER_GO_ON; /* ok, create the request */ switch(scgi_write_request(srv, hctx)) { case HANDLER_ERROR: proc = hctx->proc; host = hctx->host; if (proc && 0 == proc->is_local && proc->state != PROC_STATE_DISABLED) { /* only disable remote servers as we don't manage them*/ log_error_write(srv, __FILE__, __LINE__, "sbdb", "fcgi-server disabled:", host->host, proc->port, proc->socket); /* disable this server */ proc->disable_ts = srv->cur_ts; proc->state = PROC_STATE_DISABLED; host->active_procs--; } if (hctx->state == FCGI_STATE_INIT || hctx->state == FCGI_STATE_CONNECT) { /* connect() or getsockopt() failed, * restart the request-handling */ if (proc && proc->is_local) { if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "sbdb", "connect() to scgi failed, restarting the request-handling:", host->host, proc->port, proc->socket); } /* * several hctx might reference the same proc * * Only one of them should mark the proc as dead all the other * ones should just take a new one. * * If a new proc was started with the old struct this might lead * the mark a perfect proc as dead otherwise * */ if (proc->state == PROC_STATE_RUNNING && hctx->pid == proc->pid) { proc->state = PROC_STATE_DIED_WAIT_FOR_PID; } } scgi_restart_dead_procs(srv, p, host); scgi_connection_cleanup(srv, hctx); buffer_reset(con->physical.path); con->mode = DIRECT; joblist_append(srv, con); /* mis-using HANDLER_WAIT_FOR_FD to break out of the loop * and hope that the childs will be restarted * */ return HANDLER_WAIT_FOR_FD; } else { scgi_connection_cleanup(srv, hctx); buffer_reset(con->physical.path); con->mode = DIRECT; con->http_status = 503; return HANDLER_FINISHED; } case HANDLER_WAIT_FOR_EVENT: if (con->file_started == 1) { return HANDLER_FINISHED; } else { return HANDLER_WAIT_FOR_EVENT; } case HANDLER_WAIT_FOR_FD: return HANDLER_WAIT_FOR_FD; default: log_error_write(srv, __FILE__, __LINE__, "s", "subrequest write-req default"); return HANDLER_ERROR; } } static handler_t scgi_connection_close(server *srv, handler_ctx *hctx) { connection *con; if (NULL == hctx) return HANDLER_GO_ON; con = hctx->remote_conn; log_error_write(srv, __FILE__, __LINE__, "ssdsd", "emergency exit: scgi:", "connection-fd:", con->fd, "fcgi-fd:", hctx->fd); scgi_connection_cleanup(srv, hctx); return HANDLER_FINISHED; } static handler_t scgi_handle_fdevent(server *srv, void *ctx, int revents) { handler_ctx *hctx = ctx; connection *con = hctx->remote_conn; plugin_data *p = hctx->plugin_data; scgi_proc *proc = hctx->proc; scgi_extension_host *host= hctx->host; if ((revents & FDEVENT_IN) && hctx->state == FCGI_STATE_READ) { switch (scgi_demux_response(srv, hctx)) { case 0: break; case 1: /* we are done */ scgi_connection_cleanup(srv, hctx); joblist_append(srv, con); return HANDLER_FINISHED; case -1: if (proc->pid && proc->state != PROC_STATE_DIED) { int status; /* only fetch the zombie if it is not already done */ switch(waitpid(proc->pid, &status, WNOHANG)) { case 0: /* child is still alive */ break; case -1: break; default: /* the child should not terminate at all */ if (WIFEXITED(status)) { log_error_write(srv, __FILE__, __LINE__, "sdsd", "child exited, pid:", proc->pid, "status:", WEXITSTATUS(status)); } else if (WIFSIGNALED(status)) { log_error_write(srv, __FILE__, __LINE__, "sd", "child signaled:", WTERMSIG(status)); } else { log_error_write(srv, __FILE__, __LINE__, "sd", "child died somehow:", status); } if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "ssdsbsdsd", "--- scgi spawning", "\n\tport:", host->port, "\n\tsocket", host->unixsocket, "\n\tcurrent:", 1, "/", host->min_procs); } if (scgi_spawn_connection(srv, p, host, proc)) { /* child died */ proc->state = PROC_STATE_DIED; } else { scgi_proclist_sort_down(srv, host, proc); } break; } } if (con->file_started == 0) { /* nothing has been send out yet, try to use another child */ if (hctx->wb->bytes_out == 0 && hctx->reconnects < 5) { scgi_reconnect(srv, hctx); log_error_write(srv, __FILE__, __LINE__, "ssdsd", "response not sent, request not sent, reconnection.", "connection-fd:", con->fd, "fcgi-fd:", hctx->fd); return HANDLER_WAIT_FOR_FD; } log_error_write(srv, __FILE__, __LINE__, "sosdsd", "response not sent, request sent:", hctx->wb->bytes_out, "connection-fd:", con->fd, "fcgi-fd:", hctx->fd); scgi_connection_cleanup(srv, hctx); connection_set_state(srv, con, CON_STATE_HANDLE_REQUEST); buffer_reset(con->physical.path); con->http_status = 500; con->mode = DIRECT; } else { /* response might have been already started, kill the connection */ log_error_write(srv, __FILE__, __LINE__, "ssdsd", "response already sent out, termination connection", "connection-fd:", con->fd, "fcgi-fd:", hctx->fd); scgi_connection_cleanup(srv, hctx); connection_set_state(srv, con, CON_STATE_ERROR); } /* */ joblist_append(srv, con); return HANDLER_FINISHED; } } if (revents & FDEVENT_OUT) { if (hctx->state == FCGI_STATE_CONNECT || hctx->state == FCGI_STATE_WRITE) { /* we are allowed to send something out * * 1. in a unfinished connect() call * 2. in a unfinished write() call (long POST request) */ return mod_scgi_handle_subrequest(srv, con, p); } else { log_error_write(srv, __FILE__, __LINE__, "sd", "got a FDEVENT_OUT and didn't know why:", hctx->state); } } /* perhaps this issue is already handled */ if (revents & FDEVENT_HUP) { if (hctx->state == FCGI_STATE_CONNECT) { /* getoptsock will catch this one (right ?) * * if we are in connect we might get a EINPROGRESS * in the first call and a FDEVENT_HUP in the * second round * * FIXME: as it is a bit ugly. * */ return mod_scgi_handle_subrequest(srv, con, p); } else if (hctx->state == FCGI_STATE_READ && hctx->proc->port == 0) { /* FIXME: * * ioctl says 8192 bytes to read from PHP and we receive directly a HUP for the socket * even if the FCGI_FIN packet is not received yet */ } else { log_error_write(srv, __FILE__, __LINE__, "sbSBSDSd", "error: unexpected close of scgi connection for", con->uri.path, "(no scgi process on host: ", host->host, ", port: ", host->port, " ?)", hctx->state); connection_set_state(srv, con, CON_STATE_ERROR); scgi_connection_close(srv, hctx); joblist_append(srv, con); } } else if (revents & FDEVENT_ERR) { log_error_write(srv, __FILE__, __LINE__, "s", "fcgi: got a FDEVENT_ERR. Don't know why."); /* kill all connections to the scgi process */ connection_set_state(srv, con, CON_STATE_ERROR); scgi_connection_close(srv, hctx); joblist_append(srv, con); } return HANDLER_FINISHED; } #define PATCH(x) \ p->conf.x = s->x; static int scgi_patch_connection(server *srv, connection *con, plugin_data *p) { size_t i, j; plugin_config *s = p->config_storage[0]; PATCH(exts); PATCH(debug); /* skip the first, the global context */ for (i = 1; i < srv->config_context->used; i++) { data_config *dc = (data_config *)srv->config_context->data[i]; s = p->config_storage[i]; /* condition didn't match */ if (!config_check_cond(srv, con, dc)) continue; /* merge config */ for (j = 0; j < dc->value->used; j++) { data_unset *du = dc->value->data[j]; if (buffer_is_equal_string(du->key, CONST_STR_LEN("scgi.server"))) { PATCH(exts); } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("scgi.debug"))) { PATCH(debug); } } } return 0; } #undef PATCH static handler_t scgi_check_extension(server *srv, connection *con, void *p_d, int uri_path_handler) { plugin_data *p = p_d; size_t s_len; int used = -1; size_t k; buffer *fn; scgi_extension *extension = NULL; scgi_extension_host *host = NULL; if (con->mode != DIRECT) return HANDLER_GO_ON; /* Possibly, we processed already this request */ if (con->file_started == 1) return HANDLER_GO_ON; fn = uri_path_handler ? con->uri.path : con->physical.path; if (buffer_string_is_empty(fn)) return HANDLER_GO_ON; s_len = buffer_string_length(fn); scgi_patch_connection(srv, con, p); /* check if extension matches */ for (k = 0; k < p->conf.exts->used; k++) { size_t ct_len; scgi_extension *ext = p->conf.exts->exts[k]; if (buffer_is_empty(ext->key)) continue; ct_len = buffer_string_length(ext->key); if (s_len < ct_len) continue; /* check extension in the form "/scgi_pattern" */ if (*(ext->key->ptr) == '/') { if (strncmp(fn->ptr, ext->key->ptr, ct_len) == 0) { extension = ext; break; } } else if (0 == strncmp(fn->ptr + s_len - ct_len, ext->key->ptr, ct_len)) { /* check extension in the form ".fcg" */ extension = ext; break; } } /* extension doesn't match */ if (NULL == extension) { return HANDLER_GO_ON; } /* get best server */ for (k = 0; k < extension->used; k++) { scgi_extension_host *h = extension->hosts[k]; /* we should have at least one proc that can do something */ if (h->active_procs == 0) { continue; } if (used == -1 || h->load < used) { used = h->load; host = h; } } if (!host) { /* sorry, we don't have a server alive for this ext */ buffer_reset(con->physical.path); con->http_status = 500; /* only send the 'no handler' once */ if (!extension->note_is_sent) { extension->note_is_sent = 1; log_error_write(srv, __FILE__, __LINE__, "sbsbs", "all handlers for ", con->uri.path, "on", extension->key, "are down."); } return HANDLER_FINISHED; } /* a note about no handler is not sent yet */ extension->note_is_sent = 0; /* * if check-local is disabled, use the uri.path handler * */ /* init handler-context */ if (uri_path_handler) { if (host->check_local == 0) { handler_ctx *hctx; char *pathinfo; hctx = handler_ctx_init(); hctx->remote_conn = con; hctx->plugin_data = p; hctx->host = host; hctx->proc = NULL; hctx->conf.exts = p->conf.exts; hctx->conf.debug = p->conf.debug; con->plugin_ctx[p->id] = hctx; host->load++; con->mode = p->id; if (con->conf.log_request_handling) { log_error_write(srv, __FILE__, __LINE__, "s", "handling it in mod_scgi"); } /* the prefix is the SCRIPT_NAME, * everything from start to the next slash * this is important for check-local = "disable" * * if prefix = /admin.fcgi * * /admin.fcgi/foo/bar * * SCRIPT_NAME = /admin.fcgi * PATH_INFO = /foo/bar * * if prefix = /fcgi-bin/ * * /fcgi-bin/foo/bar * * SCRIPT_NAME = /fcgi-bin/foo * PATH_INFO = /bar * */ /* the rewrite is only done for /prefix/? matches */ if (host->fix_root_path_name && extension->key->ptr[0] == '/' && extension->key->ptr[1] == '\0') { buffer_copy_string(con->request.pathinfo, con->uri.path->ptr); buffer_string_set_length(con->uri.path, 0); } else if (extension->key->ptr[0] == '/' && buffer_string_length(con->uri.path) > buffer_string_length(extension->key) && NULL != (pathinfo = strchr(con->uri.path->ptr + buffer_string_length(extension->key), '/'))) { /* rewrite uri.path and pathinfo */ buffer_copy_string(con->request.pathinfo, pathinfo); buffer_string_set_length(con->uri.path, buffer_string_length(con->uri.path) - buffer_string_length(con->request.pathinfo)); } } } else { handler_ctx *hctx; hctx = handler_ctx_init(); hctx->remote_conn = con; hctx->plugin_data = p; hctx->host = host; hctx->proc = NULL; hctx->conf.exts = p->conf.exts; hctx->conf.debug = p->conf.debug; con->plugin_ctx[p->id] = hctx; host->load++; con->mode = p->id; if (con->conf.log_request_handling) { log_error_write(srv, __FILE__, __LINE__, "s", "handling it in mod_scgi"); } } return HANDLER_GO_ON; } /* uri-path handler */ static handler_t scgi_check_extension_1(server *srv, connection *con, void *p_d) { return scgi_check_extension(srv, con, p_d, 1); } /* start request handler */ static handler_t scgi_check_extension_2(server *srv, connection *con, void *p_d) { return scgi_check_extension(srv, con, p_d, 0); } JOBLIST_FUNC(mod_scgi_handle_joblist) { plugin_data *p = p_d; handler_ctx *hctx = con->plugin_ctx[p->id]; if (hctx == NULL) return HANDLER_GO_ON; if (hctx->fd != -1) { switch (hctx->state) { case FCGI_STATE_READ: fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN); break; case FCGI_STATE_CONNECT: case FCGI_STATE_WRITE: fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_OUT); break; case FCGI_STATE_INIT: /* at reconnect */ break; default: log_error_write(srv, __FILE__, __LINE__, "sd", "unhandled fcgi.state", hctx->state); break; } } return HANDLER_GO_ON; } static handler_t scgi_connection_close_callback(server *srv, connection *con, void *p_d) { plugin_data *p = p_d; return scgi_connection_close(srv, con->plugin_ctx[p->id]); } TRIGGER_FUNC(mod_scgi_handle_trigger) { plugin_data *p = p_d; size_t i, j, n; /* perhaps we should kill a connect attempt after 10-15 seconds * * currently we wait for the TCP timeout which is on Linux 180 seconds * * * */ /* check all childs if they are still up */ for (i = 0; i < srv->config_context->used; i++) { plugin_config *conf; scgi_exts *exts; conf = p->config_storage[i]; exts = conf->exts; for (j = 0; j < exts->used; j++) { scgi_extension *ex; ex = exts->exts[j]; for (n = 0; n < ex->used; n++) { scgi_proc *proc; unsigned long sum_load = 0; scgi_extension_host *host; host = ex->hosts[n]; scgi_restart_dead_procs(srv, p, host); for (proc = host->first; proc; proc = proc->next) { sum_load += proc->load; } if (host->num_procs && host->num_procs < host->max_procs && (sum_load / host->num_procs) > host->max_load_per_proc) { /* overload, spawn new child */ scgi_proc *fp = NULL; if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "s", "overload detected, spawning a new child"); } for (fp = host->unused_procs; fp && fp->pid != 0; fp = fp->next); if (fp) { if (fp == host->unused_procs) host->unused_procs = fp->next; if (fp->next) fp->next->prev = NULL; host->max_id++; } else { fp = scgi_process_init(); fp->id = host->max_id++; } host->num_procs++; if (buffer_string_is_empty(host->unixsocket)) { fp->port = host->port + fp->id; } else { buffer_copy_buffer(fp->socket, host->unixsocket); buffer_append_string_len(fp->socket, CONST_STR_LEN("-")); buffer_append_int(fp->socket, fp->id); } if (scgi_spawn_connection(srv, p, host, fp)) { log_error_write(srv, __FILE__, __LINE__, "s", "ERROR: spawning fcgi failed."); scgi_process_free(fp); return HANDLER_ERROR; } fp->prev = NULL; fp->next = host->first; if (host->first) { host->first->prev = fp; } host->first = fp; } for (proc = host->first; proc; proc = proc->next) { if (proc->load != 0) break; if (host->num_procs <= host->min_procs) break; if (proc->pid == 0) continue; if (srv->cur_ts - proc->last_used > host->idle_timeout) { /* a proc is idling for a long time now, * terminated it */ if (p->conf.debug) { log_error_write(srv, __FILE__, __LINE__, "ssbsd", "idle-timeout reached, terminating child:", "socket:", proc->socket, "pid", proc->pid); } if (proc->next) proc->next->prev = proc->prev; if (proc->prev) proc->prev->next = proc->next; if (proc->prev == NULL) host->first = proc->next; proc->prev = NULL; proc->next = host->unused_procs; if (host->unused_procs) host->unused_procs->prev = proc; host->unused_procs = proc; kill(proc->pid, SIGTERM); proc->state = PROC_STATE_KILLED; log_error_write(srv, __FILE__, __LINE__, "ssbsd", "killed:", "socket:", proc->socket, "pid", proc->pid); host->num_procs--; /* proc is now in unused, let the next second handle the next process */ break; } } for (proc = host->unused_procs; proc; proc = proc->next) { int status; if (proc->pid == 0) continue; switch (waitpid(proc->pid, &status, WNOHANG)) { case 0: /* child still running after timeout, good */ break; case -1: if (errno != EINTR) { /* no PID found ? should never happen */ log_error_write(srv, __FILE__, __LINE__, "sddss", "pid ", proc->pid, proc->state, "not found:", strerror(errno)); #if 0 if (errno == ECHILD) { /* someone else has cleaned up for us */ proc->pid = 0; proc->state = PROC_STATE_UNSET; } #endif } break; default: /* the child should not terminate at all */ if (WIFEXITED(status)) { if (proc->state != PROC_STATE_KILLED) { log_error_write(srv, __FILE__, __LINE__, "sdb", "child exited:", WEXITSTATUS(status), proc->socket); } } else if (WIFSIGNALED(status)) { if (WTERMSIG(status) != SIGTERM) { log_error_write(srv, __FILE__, __LINE__, "sd", "child signaled:", WTERMSIG(status)); } } else { log_error_write(srv, __FILE__, __LINE__, "sd", "child died somehow:", status); } proc->pid = 0; proc->state = PROC_STATE_UNSET; host->max_id--; } } } } } return HANDLER_GO_ON; } int mod_scgi_plugin_init(plugin *p); int mod_scgi_plugin_init(plugin *p) { p->version = LIGHTTPD_VERSION_ID; p->name = buffer_init_string("scgi"); p->init = mod_scgi_init; p->cleanup = mod_scgi_free; p->set_defaults = mod_scgi_set_defaults; p->connection_reset = scgi_connection_reset; p->handle_connection_close = scgi_connection_close_callback; p->handle_uri_clean = scgi_check_extension_1; p->handle_subrequest_start = scgi_check_extension_2; p->handle_subrequest = mod_scgi_handle_subrequest; p->handle_joblist = mod_scgi_handle_joblist; p->handle_trigger = mod_scgi_handle_trigger; p->data = NULL; return 0; }