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/* $Cambridge: hermes/src/prayer/servers/prayer_main.c,v 1.3 2008/09/16 09:59:57 dpc22 Exp $ */
/************************************************
* Prayer - a Webmail Interface *
************************************************/
/* Copyright (c) University of Cambridge 2000 - 2008 */
/* See the file NOTICE for conditions of use and distribution. */
#include "prayer_shared.h"
#include "prayer.h"
#include "prayer_server.h"
BOOL prayer_main_use_existing(struct prayer *prayer, char *ports)
{
char *use_ssl, *fd, *next;
while (ports) {
if ((next = strchr(ports, ',')))
*next++ = '\0';
if (!(use_ssl = strchr(ports, ':')))
return (NIL);
*use_ssl++ = '\0';
if (!(fd = strchr(use_ssl, ':')))
return (NIL);
*fd++ = '\0';
if (((atoi(ports) == 0) || (atoi(fd) == 0)))
return (NIL);
if (!strcmp(use_ssl, "1"))
prayer_http_port_alloc(prayer, atoi(ports), T, atoi(fd));
else
prayer_http_port_alloc(prayer, atoi(ports), NIL, atoi(fd));
ports = next;
}
return (T);
}
BOOL prayer_main_exec(struct prayer * prayer, int argc, char *argv[])
{
struct config *config = prayer->config;
struct pool *p = pool_create(8192);
struct buffer *b = buffer_create(p, 256);
char *cmd;
char **nargv = pool_alloc(p, (argc + 2) * sizeof(char *));
int i;
struct list_item *li;
bputs(b, "--ports=");
for (li = prayer->http_port_list->head; li; li = li->next) {
struct prayer_http_port *fhp = (struct prayer_http_port *) li;
if (fhp->use_ssl)
bprintf(b, "%lu:1:%lu,", fhp->port, fhp->sockfd);
else
bprintf(b, "%lu:0:%lu,", fhp->port, fhp->sockfd);
}
cmd = pool_printf(p, "%s/prayer", config->bin_dir);
for (i = 0; i < argc; i++)
nargv[i] = argv[i];
nargv[argc++] = buffer_fetch(b, 0, buffer_size(b) - 1, NIL);
nargv[argc] = NIL;
execv(cmd, nargv);
prayer_fatal(prayer, "execv(%s) failed: %s", cmd, strerror(errno));
/* NOTREACHED */
return (NIL);
}
BOOL
prayer_main_start_session(struct prayer * prayer, int argc, char *argv[])
{
struct config *config = prayer->config;
char *cmd = pool_printf(NIL, "%s/prayer-session", config->bin_dir);
char **nargv = pool_alloc(NIL, (1 + argc) * sizeof(char *));
int i, j;
nargv[0] = "prayer-session";
i = 1;
j = 1;
while (i < argc) {
if (!strcmp(argv[i], "--")) {
i++;
while (i < argc)
nargv[j++] = argv[i++];
} else if (!strcmp(argv[i], "--config-option")) {
nargv[j++] = argv[i++];
if (i < argc)
nargv[j++] = argv[i++];
} else
if (!strncmp
(argv[i], "--config-file=", strlen("--config-file=")))
nargv[j++] = argv[i++];
else
i++;
}
nargv[j] = NIL;
execv(cmd, nargv);
prayer_fatal(prayer, "execv(%s) failed: %s", cmd, strerror(errno));
/* NOTREACHED */
return (NIL);
}
/* ====================================================================== */
static BOOL prayer_main_write_pid(struct config *config)
{
char *name = pool_printf(NIL, "%s/prayer.pid", config->pid_dir);
FILE *file;
if ((file = fopen(name, "w")) == NIL)
return (NIL);
fprintf(file, "%lu\n", (unsigned long) getpid());
fclose(file);
return (T);
}
/* ====================================================================== */
int main(int argc, char *argv[])
{
BOOL want_prefork = T;
BOOL want_foreground = NIL;
BOOL want_session = T;
char *ports = NIL;
char *config_filename = PRAYER_CONFIG_FILE;
struct config *config = config_create();
struct prayer *prayer;
struct list_item *li;
int i;
extern char **environ;
struct ssl_config ssl_config;
/* Disable supplementary groups, look for (temporary) unprivileged group */
if (getuid() == 0) {
struct group *group;
setgroups(0, NIL);
if ((group = getgrnam("other")) != NIL)
setgid(group->gr_gid);
else if ((group = getgrnam("nobody")) != NIL)
setgid(group->gr_gid);
}
if (getenv("PRAYER_CONFIG_FILE"))
config_filename = getenv("PRAYER_CONFIG_FILE");
initsetproctitle("prayer", argc, argv, environ);
os_signal_init();
response_record_version(VERSION_PRAYER);
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--help")) {
fprintf(stderr, "Options:\n");
fprintf(stderr,
(" --config-file: Define prayer config file\n"));
fprintf(stderr,
(" "
"(Overrides compilation default and PRAYER_CONFIG_FILE)\n"));
fprintf(stderr,
(" --config-option: Override single configuration option\n"));
fprintf(stderr, "\n");
fprintf(stderr,
(" --foreground: "
"Run single threaded server in foreground\n"));
fprintf(stderr,
(" --disable-prefork: Run as simple fork()/exec() daemon\n"));
fprintf(stderr,
(" --disable-session: Don't start up prayer-session server\n"));
fprintf(stderr,
(" --help: Show this list of options\n"));
fprintf(stderr,
(" --: "
"End of prayer options: remaining options will be passed\n"));
fprintf(stderr,
(" to prayer-session server process\n"));
exit(0);
} else if (!strcmp(argv[i], "--foreground"))
want_foreground = T;
else if (!strcmp(argv[i], "--disable-prefork"))
want_prefork = NIL;
else if (!strcmp(argv[i], "--disable-session"))
want_session = NIL;
else if (!strncmp(argv[i],
"--config-file=", strlen("--config-file="))) {
config_filename = strdup(argv[i] + strlen("--config-file="));
} else if (!strcmp(argv[i], "--config-option")) {
i++; /* Processes next argv */
} else if (!strncmp(argv[i], "--ports=", strlen("--ports="))) {
ports = argv[i] + strlen("--ports=");
} else if (!strcmp(argv[i], "--")) {
continue;
} else {
fprintf(stderr, "Unknown option: %s\n", argv[i]);
exit(1);
}
}
config = config_create();
if (!config_parse_file(config, config_filename))
exit(1);
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--config-option")) {
if (++i < argc) {
if (!config_parse_option(config, strdup(argv[i])))
exit(1);
} else
fprintf(stderr, "--config processes following option");
}
}
if (!config_check(config))
exit(1);
if (!config_expand(config))
exit(1);
/* Generate a clean copy of the configuration without all of the noise */
{
struct config *config_clean = config_clone_parsed(config);
config_free(config);
config = config_clean;
}
/* Set up prayer frontend structure to bind everything together */
prayer = prayer_create(config);
if (ports == NIL) {
if (config->http_port_list == NIL)
prayer_fatal(prayer, "No HTTP or HTTPS ports defined");
for (li = config->http_port_list->head; li; li = li->next) {
struct config_http_port *chp = (struct config_http_port *) li;
prayer_http_port_open(prayer, chp->port, chp->use_ssl,
chp->interface);
}
} else if (!prayer_main_use_existing(prayer, ports))
prayer_fatal(prayer, "Invalid --ports argument");
if (list_length(prayer->http_port_list) == 0L)
prayer_fatal(prayer, "No HTTP or HTTPS ports active");
/* Don't need root privs after ports bound, files open */
if (getuid() == 0) {
if ((config->prayer_uid == 0) || (config->prayer_gid == 0))
log_fatal("Configured to run as root!");
if (config->prayer_gid) {
setgid(config->prayer_gid);
if (config->prayer_user && config->prayer_user[0])
initgroups(config->prayer_user, config->prayer_gid);
}
if (config->prayer_uid)
setuid(config->prayer_uid);
if (getuid() == 0)
log_fatal("Failed to lose root priveledges"); /* Stop impossible loop */
/* Reexec after losing root privs to prevent core dump paranoia */
if (ports == NIL) {
prayer_main_exec(prayer, argc, argv);
/* Should be redundant */
prayer_fatal(prayer, "prayer_main_exec() failed");
}
}
if (getuid() == 0)
log_fatal("Configured to run as root!");
config_mkdirs(config);
log_misc_init(config, argv[0], "prayer");
prayer_log_open(prayer);
dlopen_templates(config->template_set, "_frontend");
if (config->limit_vm)
os_limit_vm(config->limit_vm);
/* Ports have bound successfully and we've lost root privilege */
/* Fork off a session server process now if we want one. */
if (want_session) {
pid_t pid = fork();
if (pid < 0)
prayer_fatal(prayer,
"Couldn't start session server - fork() failed: %s",
strerror(errno));
if (pid == 0) {
/* Child process */ ;
/* Shut down unneeded file descriptors */
prayer_http_port_close(prayer);
/* Including stdin, stdout, stderr */
close(0);
close(1);
close(2);
open("/dev/null", O_RDONLY); /* Reopen stdin */
open("/dev/null", O_WRONLY); /* Reopen stdout */
open("/dev/null", O_WRONLY); /* Reopen stderr */
prayer_main_start_session(prayer, argc, argv);
}
}
if (config->tmp_dir)
chdir(config->tmp_dir);
/* Required for SSL stuff */
config_extract_ssl(config, &ssl_config);
iostream_init(&ssl_config);
if (config->prayer_background && !want_foreground) {
pid_t pid = fork();
if (pid < 0)
prayer_fatal(prayer,
"Failed to background server - fork() failed: %s",
strerror(errno));
if (pid > 0)
exit(0); /* Parent process */
/* Child process */
/* Shut down stdin, stdout, stderr */
close(0);
close(1);
close(2);
open("/dev/null", O_RDONLY); /* Reopen stdin */
open("/dev/null", O_WRONLY); /* Reopen stdout */
open("/dev/null", O_WRONLY); /* Reopen stderr */
}
prayer_main_write_pid(config);
if (want_prefork && !want_foreground)
prayer_server_prefork(prayer);
else
prayer_server(prayer, want_foreground);
/* NOTREACHED */
return (0);
}
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