#include <ctype.h>
#include <glob.h>
#include <libgen.h>
+#include <sys/socket.h>
+#include <time.h>
#include <errno.h>
#ifdef HAVE_CONFIG_H
#define CH_SOCKET 0
#define CH_FORK 1
+struct stdchild {
+ int type;
+ char **argv;
+ char **envp;
+ int fd;
+ int agains;
+ time_t lastrep;
+};
+
static int parsefile(struct cfstate *s, FILE *in);
+static void stdmerge(struct child *old, struct child *new);
+static int stdhandle(struct child *ch, struct hthead *req, int fd, void (*chinit)(void *), void *idata);
+static void stddestroy(struct child *ch);
static int doinclude(struct cfstate *s, char *spec)
{
char *findstdconf(char *name)
{
- char *path, *p, *p2, *t;
+ char *home, *path, *p, *p2, *t;
- if((path = getenv("PATH")) == NULL)
- return(NULL);
- path = sstrdup(path);
- for(p = strtok(path, ":"); p != NULL; p = strtok(NULL, ":")) {
- if((p2 = strrchr(p, '/')) == NULL)
- continue;
- *p2 = 0;
- if(!access(t = sprintf2("%s/etc/%s", p, name), R_OK)) {
- free(path);
+ if((home = getenv("HOME")) != NULL) {
+ if(!access(t = sprintf2("%s/.ashd/etc/%s", home, name), R_OK))
return(t);
- }
free(t);
}
- free(path);
+ if((path = getenv("PATH")) != NULL) {
+ path = sstrdup(path);
+ for(p = strtok(path, ":"); p != NULL; p = strtok(NULL, ":")) {
+ if((p2 = strrchr(p, '/')) == NULL)
+ continue;
+ *p2 = 0;
+ if(!access(t = sprintf2("%s/etc/%s", p, name), R_OK)) {
+ free(path);
+ return(t);
+ }
+ free(t);
+ }
+ free(path);
+ }
return(NULL);
}
-static struct child *newchild(char *name, int type)
+struct child *newchild(char *name, struct chandler *iface, void *pdata)
{
struct child *ch;
omalloc(ch);
ch->name = sstrdup(name);
- ch->type = type;
- ch->fd = -1;
+ ch->iface = iface;
+ ch->pdata = pdata;
return(ch);
}
void freechild(struct child *ch)
{
- if(ch->fd != -1)
- close(ch->fd);
+ if(ch->iface->destroy != NULL)
+ ch->iface->destroy(ch);
if(ch->name != NULL)
free(ch->name);
- if(ch->argv != NULL)
- freeca(ch->argv);
free(ch);
}
+void mergechildren(struct child *dst, struct child *src)
+{
+ struct child *ch1, *ch2;
+
+ for(ch1 = dst; ch1 != NULL; ch1 = ch1->next) {
+ for(ch2 = src; ch2 != NULL; ch2 = ch2->next) {
+ if(ch1->iface->merge && !strcmp(ch1->name, ch2->name)) {
+ ch1->iface->merge(ch1, ch2);
+ break;
+ }
+ }
+ }
+}
+
void skipcfblock(struct cfstate *s)
{
char **w;
}
}
+static struct chandler stdhandler = {
+ .handle = stdhandle,
+ .merge = stdmerge,
+ .destroy = stddestroy,
+};
+
+static char **expandargs(struct stdchild *sd)
+{
+ int i;
+ char **ret, *p, *p2, *p3, *np, *env;
+ struct charbuf exp;
+
+ ret = szmalloc(sizeof(*ret) * (calen(sd->argv) + 1));
+ bufinit(exp);
+ for(i = 0; sd->argv[i] != NULL; i++) {
+ if((p = strchr(sd->argv[i], '$')) == NULL) {
+ ret[i] = sstrdup(sd->argv[i]);
+ } else {
+ exp.d = 0;
+ for(p2 = sd->argv[i]; p != NULL; p2 = np, p = strchr(np, '$')) {
+ bufcat(exp, p2, p - p2);
+ if(p[1] == '{') {
+ if((p3 = strchr((p += 2), '}')) == NULL) {
+ np = p;
+ break;
+ }
+ np = p3 + 1;
+ } else {
+ for(p3 = ++p; *p3; p3++) {
+ if(!(((*p3 >= 'a') && (*p3 <= 'z')) ||
+ ((*p3 >= 'A') && (*p3 <= 'Z')) ||
+ ((*p3 >= '0') && (*p3 <= '9')) ||
+ (*p3 == '_'))) {
+ break;
+ }
+ }
+ np = p3;
+ }
+ char temp[(p3 - p) + 1];
+ memcpy(temp, p, p3 - p);
+ temp[p3 - p] = 0;
+ if((env = getenv(temp)) != NULL)
+ bufcatstr(exp, env);
+ }
+ bufcatstr2(exp, np);
+ ret[i] = sstrdup(exp.b);
+ }
+ }
+ ret[i] = NULL;
+ buffree(exp);
+ return(ret);
+}
+
+struct sidata {
+ struct stdchild *sd;
+ void (*sinit)(void *);
+ void *sdata;
+};
+
+static void stdinit(void *data)
+{
+ struct sidata *d = data;
+ int i;
+
+ for(i = 0; d->sd->envp[i]; i += 2)
+ putenv(sprintf2("%s=%s", d->sd->envp[i], d->sd->envp[i + 1]));
+ if(d->sinit != NULL)
+ d->sinit(d->sdata);
+}
+
+static int stdhandle(struct child *ch, struct hthead *req, int fd, void (*chinit)(void *), void *sdata)
+{
+ struct stdchild *sd = ch->pdata;
+ int serr;
+ char **args;
+ struct sidata idat;
+
+ if(sd->type == CH_SOCKET) {
+ idat = (struct sidata) {.sd = sd, .sinit = chinit, .sdata = sdata};
+ if(sd->fd < 0) {
+ args = expandargs(sd);
+ sd->fd = stdmkchild(args, stdinit, &idat);
+ freeca(args);
+ }
+ if(sendreq2(sd->fd, req, fd, MSG_NOSIGNAL | MSG_DONTWAIT)) {
+ serr = errno;
+ if((serr == EPIPE) || (serr == ECONNRESET)) {
+ /* Assume that the child has crashed and restart it. */
+ close(sd->fd);
+ args = expandargs(sd);
+ sd->fd = stdmkchild(args, stdinit, &idat);
+ freeca(args);
+ if(!sendreq2(sd->fd, req, fd, MSG_NOSIGNAL | MSG_DONTWAIT))
+ goto ok;
+ serr = errno;
+ }
+ if(serr == EAGAIN) {
+ if(sd->agains++ == 0) {
+ flog(LOG_WARNING, "request to child %s denied due to buffer overload", ch->name);
+ sd->lastrep = time(NULL);
+ }
+ } else {
+ flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(serr));
+ close(sd->fd);
+ sd->fd = -1;
+ }
+ return(-1);
+ }
+ ok:
+ if((sd->agains > 0) && ((time(NULL) - sd->lastrep) > 10)) {
+ flog(LOG_WARNING, "%i requests to child %s were denied due to buffer overload", sd->agains, ch->name);
+ sd->agains = 0;
+ }
+ } else if(sd->type == CH_FORK) {
+ args = expandargs(sd);
+ if(stdforkserve(args, req, fd, chinit, sdata) < 0) {
+ freeca(args);
+ return(-1);
+ }
+ freeca(args);
+ }
+ return(0);
+}
+
+static void stdmerge(struct child *dst, struct child *src)
+{
+ struct stdchild *od, *nd;
+
+ if(src->iface == &stdhandler) {
+ nd = dst->pdata;
+ od = src->pdata;
+ nd->fd = od->fd;
+ od->fd = -1;
+ }
+}
+
+static void stddestroy(struct child *ch)
+{
+ struct stdchild *d = ch->pdata;
+
+ if(d->fd >= 0)
+ close(d->fd);
+ if(d->argv)
+ freeca(d->argv);
+ if(d->envp)
+ freeca(d->envp);
+ free(d);
+}
+
struct child *parsechild(struct cfstate *s)
{
struct child *ch;
+ struct stdchild *d;
+ struct charvbuf envbuf;
int i;
int sl;
skipcfblock(s);
return(NULL);
}
- ch = newchild(s->argv[1], CH_SOCKET);
+ ch = newchild(s->argv[1], &stdhandler, omalloc(d));
+ d->type = CH_SOCKET;
} else if(!strcmp(s->argv[0], "fchild")) {
s->expstart = 1;
if(s->argc < 2) {
skipcfblock(s);
return(NULL);
}
- ch = newchild(s->argv[1], CH_FORK);
+ ch = newchild(s->argv[1], &stdhandler, omalloc(d));
+ d->type = CH_FORK;
} else {
return(NULL);
}
+ d->fd = -1;
+ bufinit(envbuf);
while(1) {
getcfline(s);
if(!strcmp(s->argv[0], "exec")) {
flog(LOG_WARNING, "%s:%i: too few parameters to `exec'", s->file, s->lno);
continue;
}
- ch->argv = szmalloc(sizeof(*ch->argv) * s->argc);
+ d->argv = szmalloc(sizeof(*d->argv) * s->argc);
for(i = 0; i < s->argc - 1; i++)
- ch->argv[i] = sstrdup(s->argv[i + 1]);
+ d->argv[i] = sstrdup(s->argv[i + 1]);
+ } else if(!strcmp(s->argv[0], "env")) {
+ if(s->argc < 3) {
+ flog(LOG_WARNING, "%s:%i: too few parameters to `env'", s->file, s->lno);
+ continue;
+ }
+ bufadd(envbuf, sstrdup(s->argv[1]));
+ bufadd(envbuf, sstrdup(s->argv[2]));
} else if(!strcmp(s->argv[0], "end") || !strcmp(s->argv[0], "eof")) {
break;
} else {
flog(LOG_WARNING, "%s:%i: unknown directive `%s' in child declaration", s->file, s->lno, s->argv[0]);
}
}
- if(ch->argv == NULL) {
+ bufadd(envbuf, NULL);
+ d->envp = envbuf.b;
+ if(d->argv == NULL) {
flog(LOG_WARNING, "%s:%i: missing `exec' in child declaration %s", s->file, sl, ch->name);
freechild(ch);
return(NULL);
int childhandle(struct child *ch, struct hthead *req, int fd, void (*chinit)(void *), void *idata)
{
- if(ch->type == CH_SOCKET) {
- if(ch->fd < 0)
- ch->fd = stdmkchild(ch->argv, chinit, idata);
- if(sendreq(ch->fd, req, fd)) {
- if(errno == EPIPE) {
- /* Assume that the child has crashed and restart it. */
- close(ch->fd);
- ch->fd = stdmkchild(ch->argv, chinit, idata);
- if(!sendreq(ch->fd, req, fd))
- return(0);
- }
- flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(errno));
- close(ch->fd);
- ch->fd = -1;
- return(-1);
- }
- } else if(ch->type == CH_FORK) {
- if(stdforkserve(ch->argv, req, fd, chinit, idata) < 0)
- return(-1);
- }
- return(0);
+ return(ch->iface->handle(ch, req, fd, chinit, idata));
}
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