From: Felix Fietkau Date: Wed, 13 Oct 2010 19:17:51 +0000 (+0200) Subject: Initial import X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=e82d74f89809c6c01f71168b3b8fdcf490e93fa7;p=oweals%2Flibubox.git Initial import --- e82d74f89809c6c01f71168b3b8fdcf490e93fa7 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..140f8cf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +*.so diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..8af237d --- /dev/null +++ b/Makefile @@ -0,0 +1,28 @@ +CC?=gcc +CFLAGS?=-O2 +CFLAGS+=-std=gnu99 -Wall -Werror -pedantic -fpic +LDFLAGS?= +LIBNL=-lnl-tiny +PREFIX=/usr +INCLUDE_DIR=$(PREFIX)/include/libubox +LIBDIR=$(PREFIX)/lib +CPPFLAGS= + +all: libubox.so + +libubox.so: ucix.c blob.c blobmsg.c hash.c uhtbl.c usock.c uloop.c unl.c + $(CC) $(CFLAGS) $(CPPFLAGS) -o $@ -shared -Wl,-soname,libubox.so $^ $(LDFLAGS) -luci $(LIBNL) + +install-headers: + mkdir -p $(INCLUDE_DIR) + cp *.h $(INCLUDE_DIR)/ + +install-lib: + mkdir -p $(LIBDIR) + cp libubox.so $(LIBDIR)/ + +install: install-lib install-headers + +clean: + rm -f *.so + diff --git a/blob.c b/blob.c new file mode 100644 index 0000000..823eb24 --- /dev/null +++ b/blob.c @@ -0,0 +1,177 @@ +/* + * blob - library for generating/parsing tagged binary data + * + * Copyright (C) 2010 Felix Fietkau + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include "blob.h" + +static bool +blob_buffer_grow(struct blob_buf *buf, int minlen) +{ + buf->buflen += ((minlen / 256) + 1) * 256; + buf->buf = realloc(buf->buf, buf->buflen); + return !!buf->buf; +} + +static void +blob_init(struct blob_attr *attr, int id, unsigned int len) +{ + len &= BLOB_ATTR_LEN_MASK; + len |= (id << BLOB_ATTR_ID_SHIFT) & BLOB_ATTR_ID_MASK; + attr->id_len = cpu_to_be32(len); +} + +static inline struct blob_attr * +offset_to_attr(struct blob_buf *buf, int offset) +{ + void *ptr = (char *)buf->buf + offset; + return ptr; +} + +static inline int +attr_to_offset(struct blob_buf *buf, struct blob_attr *attr) +{ + return (char *)attr - (char *) buf->buf; +} + +static struct blob_attr * +blob_add(struct blob_buf *buf, struct blob_attr *pos, int id, int payload) +{ + int offset = attr_to_offset(buf, pos); + int required = (offset + sizeof(struct blob_attr) + payload) - buf->buflen; + struct blob_attr *attr; + + if (required > 0) { + int offset_head = attr_to_offset(buf, buf->head); + + if (!buf->grow || !buf->grow(buf, required)) + return NULL; + + buf->head = offset_to_attr(buf, offset_head); + attr = offset_to_attr(buf, offset); + } else { + attr = pos; + } + + blob_init(attr, id, payload + sizeof(struct blob_attr)); + return attr; +} + +int +blob_buf_init(struct blob_buf *buf, int id) +{ + if (!buf->grow) + buf->grow = blob_buffer_grow; + + buf->head = buf->buf; + if (blob_add(buf, buf->buf, id, 0) == NULL) + return -ENOMEM; + + return 0; +} + +struct blob_attr * +blob_new(struct blob_buf *buf, int id, int payload) +{ + struct blob_attr *attr; + + attr = blob_add(buf, blob_next(buf->head), id, payload); + if (!attr) + return NULL; + + blob_set_raw_len(buf->head, blob_pad_len(buf->head) + blob_pad_len(attr)); + return attr; +} + +struct blob_attr * +blob_put(struct blob_buf *buf, int id, const void *ptr, int len) +{ + struct blob_attr *attr; + + attr = blob_new(buf, id, len); + if (!attr) + return NULL; + + if (ptr) + memcpy(blob_data(attr), ptr, len); + return attr; +} + +void * +blob_nest_start(struct blob_buf *buf, int id) +{ + unsigned long offset = attr_to_offset(buf, buf->head); + buf->head = blob_new(buf, id, 0); + return (void *) offset; +} + +void +blob_nest_end(struct blob_buf *buf, void *cookie) +{ + struct blob_attr *attr = offset_to_attr(buf, (unsigned long) cookie); + blob_set_raw_len(attr, blob_pad_len(attr) + blob_len(buf->head)); + buf->head = attr; +} + +static const int blob_type_minlen[BLOB_ATTR_LAST] = { + [BLOB_ATTR_STRING] = 1, + [BLOB_ATTR_INT8] = sizeof(uint8_t), + [BLOB_ATTR_INT16] = sizeof(uint16_t), + [BLOB_ATTR_INT32] = sizeof(uint32_t), + [BLOB_ATTR_INT64] = sizeof(uint64_t), +}; + +int +blob_parse(struct blob_attr *attr, struct blob_attr **data, struct blob_attr_info *info, int max) +{ + struct blob_attr *pos; + int found = 0; + int rem; + + memset(data, 0, sizeof(struct blob_attr *) * max); + blob_for_each_attr(pos, attr, rem) { + int id = blob_id(pos); + int len = blob_len(pos); + + if (id >= max) + continue; + + if (info) { + int type = info[id].type; + if (type < BLOB_ATTR_LAST) { + if (type >= BLOB_ATTR_INT8 && type <= BLOB_ATTR_INT64) { + if (len != blob_type_minlen[type]) + continue; + } else { + if (len < blob_type_minlen[type]) + continue; + } + } + + if (info[id].minlen && len < info[id].minlen) + continue; + + if (info[id].maxlen && len > info[id].maxlen) + continue; + + if (info[id].validate && !info[id].validate(&info[id], attr)) + continue; + } + + if (!data[id]) + found++; + + data[id] = pos; + } + return found; +} diff --git a/blob.h b/blob.h new file mode 100644 index 0000000..e598c5e --- /dev/null +++ b/blob.h @@ -0,0 +1,271 @@ +/* + * blob - library for generating/parsing tagged binary data + * + * Copyright (C) 2010 Felix Fietkau + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _BLOB_H__ +#define _BLOB_H__ + +#include +#include +#include +#include +#include +#include + +#if __BYTE_ORDER == __LITTLE_ENDIAN + +#if defined(__linux__) || defined(__CYGWIN__) +#include +#include + +#elif defined(__APPLE__) +#include +#include +#define bswap_16(x) OSSwapInt16(x) +#define bswap_32(x) OSSwapInt32(x) +#define bswap_64(x) OSSwapInt64(x) +#elif defined(__FreeBSD__) +#include +#define bswap_16(x) bswap16(x) +#define bswap_32(x) bswap32(x) +#define bswap_64(x) bswap64(x) +#else +#include +#define bswap_16(x) swap16(x) +#define bswap_32(x) swap32(x) +#define bswap_64(x) swap64(x) +#endif + +#ifndef __BYTE_ORDER +#define __BYTE_ORDER BYTE_ORDER +#endif +#ifndef __BIG_ENDIAN +#define __BIG_ENDIAN BIG_ENDIAN +#endif +#ifndef __LITTLE_ENDIAN +#define __LITTLE_ENDIAN LITTLE_ENDIAN +#endif + +#define cpu_to_be64(x) bswap_64(x) +#define cpu_to_be32(x) bswap_32(x) +#define cpu_to_be16(x) bswap_16(x) + +#define be64_to_cpu(x) bswap_64(x) +#define be32_to_cpu(x) bswap_32(x) +#define be16_to_cpu(x) bswap_16(x) + +#else + +#define cpu_to_be64(x) (x) +#define cpu_to_be32(x) (x) +#define cpu_to_be16(x) (x) + +#define be64_to_cpu(x) (x) +#define be32_to_cpu(x) (x) +#define be16_to_cpu(x) (x) + +#endif + +enum { + BLOB_ATTR_UNSPEC, + BLOB_ATTR_NESTED, + BLOB_ATTR_BINARY, + BLOB_ATTR_STRING, + BLOB_ATTR_INT8, + BLOB_ATTR_INT16, + BLOB_ATTR_INT32, + BLOB_ATTR_INT64, + BLOB_ATTR_LAST +}; + +#define BLOB_ATTR_ID_MASK 0xff000000 +#define BLOB_ATTR_ID_SHIFT 24 +#define BLOB_ATTR_LEN_MASK 0x00ffffff +#define BLOB_ATTR_ALIGN 4 + +#ifndef __packed +#define __packed __attribute__((packed)) +#endif + +struct blob_attr { + uint32_t id_len; + char data[]; +} __packed; + +struct blob_attr_info { + unsigned int type; + unsigned int minlen; + unsigned int maxlen; + bool (*validate)(struct blob_attr_info *, struct blob_attr *); +}; + +struct blob_buf { + struct blob_attr *head; + bool (*grow)(struct blob_buf *buf, int minlen); + int buflen; + void *buf; + void *priv; +}; + +/* + * blob_data: returns the data pointer for an attribute + */ +static inline void * +blob_data(struct blob_attr *attr) +{ + return attr->data; +} + +/* + * blob_id: returns the id of an attribute + */ +static inline unsigned int +blob_id(struct blob_attr *attr) +{ + int id = (be32_to_cpu(attr->id_len) & BLOB_ATTR_ID_MASK) >> BLOB_ATTR_ID_SHIFT; + return id; +} + +/* + * blob_len: returns the length of the attribute's payload + */ +static inline unsigned int +blob_len(struct blob_attr *attr) +{ + return (be32_to_cpu(attr->id_len) & BLOB_ATTR_LEN_MASK) - sizeof(struct blob_attr); +} + +/* + * blob_pad_len: returns the complete length of an attribute (including the header) + */ +static inline unsigned int +blob_raw_len(struct blob_attr *attr) +{ + return blob_len(attr) + sizeof(struct blob_attr); +} + +/* + * blob_pad_len: returns the padded length of an attribute (including the header) + */ +static inline unsigned int +blob_pad_len(struct blob_attr *attr) +{ + int len = blob_raw_len(attr); + len = (len + BLOB_ATTR_ALIGN - 1) & ~(BLOB_ATTR_ALIGN - 1); + return len; +} + +static inline void +blob_set_raw_len(struct blob_attr *attr, unsigned int len) +{ + int id = blob_id(attr); + len &= BLOB_ATTR_LEN_MASK; + len |= (id << BLOB_ATTR_ID_SHIFT) & BLOB_ATTR_ID_MASK; + attr->id_len = cpu_to_be32(len); +} + +static inline uint8_t +blob_get_int8(struct blob_attr *attr) +{ + return *((uint8_t *) attr->data); +} + +static inline uint16_t +blob_get_int16(struct blob_attr *attr) +{ + uint16_t *tmp = (uint16_t*)attr->data; + return be16_to_cpu(*tmp); +} + +static inline uint32_t +blob_get_int32(struct blob_attr *attr) +{ + uint32_t *tmp = (uint32_t*)attr->data; + return be32_to_cpu(*tmp); +} + +static inline uint64_t +blob_get_int64(struct blob_attr *attr) +{ + uint64_t *tmp = (uint64_t*)attr->data; + return be64_to_cpu(*tmp); +} + +static inline const char * +blob_get_string(struct blob_attr *attr) +{ + return attr->data; +} + +static inline struct blob_attr * +blob_next(struct blob_attr *attr) +{ + return (struct blob_attr *) ((char *) attr + blob_pad_len(attr)); +} + +extern int blob_buf_init(struct blob_buf *buf, int id); +extern struct blob_attr *blob_new(struct blob_buf *buf, int id, int payload); +extern void *blob_nest_start(struct blob_buf *buf, int id); +extern void blob_nest_end(struct blob_buf *buf, void *cookie); +extern struct blob_attr *blob_put(struct blob_buf *buf, int id, const void *ptr, int len); +extern int blob_parse(struct blob_attr *attr, struct blob_attr **data, struct blob_attr_info *info, int max); + +static inline struct blob_attr * +blob_put_string(struct blob_buf *buf, int id, const char *str) +{ + return blob_put(buf, id, str, strlen(str) + 1); +} + +static inline struct blob_attr * +blob_put_int8(struct blob_buf *buf, int id, uint8_t val) +{ + return blob_put(buf, id, &val, sizeof(val)); +} + +static inline struct blob_attr * +blob_put_int16(struct blob_buf *buf, int id, uint16_t val) +{ + val = cpu_to_be16(val); + return blob_put(buf, id, &val, sizeof(val)); +} + +static inline struct blob_attr * +blob_put_int32(struct blob_buf *buf, int id, uint32_t val) +{ + val = cpu_to_be32(val); + return blob_put(buf, id, &val, sizeof(val)); +} + +static inline struct blob_attr * +blob_put_int64(struct blob_buf *buf, int id, uint64_t val) +{ + val = cpu_to_be64(val); + return blob_put(buf, id, &val, sizeof(val)); +} + +#define __blob_for_each_attr(pos, attr, rem) \ + for (pos = (void *) attr; \ + (blob_pad_len(pos) <= rem) && \ + (blob_pad_len(pos) >= sizeof(struct blob_attr)); \ + rem -= blob_pad_len(pos), pos = blob_next(pos)) + + +#define blob_for_each_attr(pos, attr, rem) \ + for (rem = blob_len(attr), pos = blob_data(attr); \ + (blob_pad_len(pos) <= rem) && \ + (blob_pad_len(pos) >= sizeof(struct blob_attr)); \ + rem -= blob_pad_len(pos), pos = blob_next(pos)) + + +#endif diff --git a/blobmsg.c b/blobmsg.c new file mode 100644 index 0000000..25b72ae --- /dev/null +++ b/blobmsg.c @@ -0,0 +1,148 @@ +/* + * blobmsg - library for generating/parsing structured blob messages + * + * Copyright (C) 2010 Felix Fietkau + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include "blobmsg.h" + +int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len, + struct blob_attr **tb, void *data, int len) +{ + struct blobmsg_hdr *hdr; + struct blob_attr *attr; + uint8_t *pslen; + int i; + + memset(tb, 0, policy_len * sizeof(*tb)); + pslen = alloca(policy_len); + for (i = 0; i < policy_len; i++) { + if (!policy[i].name) + continue; + + pslen[i] = strlen(policy[i].name); + } + + __blob_for_each_attr(attr, data, len) { + hdr = blob_data(attr); + for (i = 0; i < policy_len; i++) { + if (!policy[i].name) + continue; + + if (policy[i].type != BLOBMSG_TYPE_UNSPEC && + blob_id(attr) != policy[i].type) + continue; + + if (hdr->namelen != pslen[i]) + continue; + + if (!hdr->namelen) + return -1; + + if (sizeof(*attr) + blobmsg_hdrlen(hdr->namelen) > blob_pad_len(attr)) + return -1; + + if (hdr->name[hdr->namelen] != 0) + return -1; + + if (tb[i]) + return -1; + + if (strcmp(policy[i].name, (char *) hdr->name) != 0) + continue; + + tb[i] = attr; + } + } + + return 0; +} + + +static struct blob_attr * +blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data) +{ + struct blob_attr *attr; + struct blobmsg_hdr *hdr; + int attrlen, namelen; + + if (blob_id(buf->head) == BLOBMSG_TYPE_ARRAY && !name) { + attr = blob_new(buf, type, payload_len); + *data = blob_data(attr); + return attr; + } + + if (blob_id(buf->head) != BLOBMSG_TYPE_TABLE || !name) + return NULL; + + namelen = strlen(name); + attrlen = blobmsg_hdrlen(namelen) + payload_len; + attr = blob_new(buf, type, attrlen); + if (!attr) + return NULL; + + hdr = blob_data(attr); + hdr->namelen = namelen; + strcpy((char *) hdr->name, (const char *)name); + *data = blobmsg_data(attr); + + return attr; +} + +static inline int +attr_to_offset(struct blob_buf *buf, struct blob_attr *attr) +{ + return (char *)attr - (char *) buf->buf; +} + + +void * +blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array) +{ + struct blob_attr *head = buf->head; + int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE; + unsigned long offset = attr_to_offset(buf, buf->head); + void *data; + + if (blob_id(head) == BLOBMSG_TYPE_ARRAY && !name) + return blob_nest_start(buf, type); + + if (blob_id(head) == BLOBMSG_TYPE_TABLE && name) { + head = blobmsg_new(buf, type, name, 0, &data); + blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name))); + buf->head = head; + return (void *)offset; + } + + return NULL; +} + +int +blobmsg_add_field(struct blob_buf *buf, int type, const char *name, + const void *data, int len) +{ + struct blob_attr *attr; + void *data_dest; + + if (type == BLOBMSG_TYPE_ARRAY || + type == BLOBMSG_TYPE_TABLE) + return -1; + + attr = blobmsg_new(buf, type, name, len, &data_dest); + if (!attr) + return -1; + + if (len > 0) + memcpy(data_dest, data, len); + + return 0; +} diff --git a/blobmsg.h b/blobmsg.h new file mode 100644 index 0000000..9e71939 --- /dev/null +++ b/blobmsg.h @@ -0,0 +1,133 @@ +/* + * blobmsg - library for generating/parsing structured blob messages + * + * Copyright (C) 2010 Felix Fietkau + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __BLOBMSG_H +#define __BLOBMSG_H + +#include "blob.h" + +#define BLOBMSG_ALIGN 2 +#define BLOBMSG_PADDING(len) (((len) + (1 << BLOBMSG_ALIGN) - 1) & ~((1 << BLOBMSG_ALIGN) - 1)) + +enum blobmsg_type { + BLOBMSG_TYPE_UNSPEC, + BLOBMSG_TYPE_ARRAY, + BLOBMSG_TYPE_TABLE, + BLOBMSG_TYPE_STRING, + BLOBMSG_TYPE_INT64, + BLOBMSG_TYPE_INT32, + BLOBMSG_TYPE_INT16, + BLOBMSG_TYPE_INT8 +}; + +struct blobmsg_hdr { + uint8_t namelen; + uint8_t name[]; +} __packed; + +struct blobmsg_policy { + const char *name; + enum blobmsg_type type; +}; + +static inline int blobmsg_hdrlen(int namelen) +{ + return BLOBMSG_PADDING(sizeof(struct blobmsg_hdr) + namelen + 1); +} + +static inline void *blobmsg_data(struct blob_attr *attr) +{ + struct blobmsg_hdr *hdr = blob_data(attr); + return &hdr->name[blobmsg_hdrlen(hdr->namelen) - 1]; +} + +static inline int blobmsg_data_len(struct blob_attr *attr) +{ + uint8_t *start, *end; + + start = blob_data(attr); + end = blobmsg_data(attr); + + return blob_len(attr) - (end - start); +} + +int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len, + struct blob_attr **tb, void *data, int len); + +int blobmsg_add_field(struct blob_buf *buf, int type, const char *name, + const void *data, int len); + +static inline int +blobmsg_add_u8(struct blob_buf *buf, const char *name, uint8_t val) +{ + return blobmsg_add_field(buf, BLOBMSG_TYPE_INT8, name, &val, 1); +} + +static inline int +blobmsg_add_u16(struct blob_buf *buf, const char *name, uint16_t val) +{ + return blobmsg_add_field(buf, BLOBMSG_TYPE_INT16, name, &val, 2); +} + +static inline int +blobmsg_add_u32(struct blob_buf *buf, const char *name, uint32_t val) +{ + return blobmsg_add_field(buf, BLOBMSG_TYPE_INT32, name, &val, 4); +} + +static inline int +blobmsg_add_u64(struct blob_buf *buf, const char *name, uint64_t val) +{ + return blobmsg_add_field(buf, BLOBMSG_TYPE_INT64, name, &val, 8); +} + +static inline int +blobmsg_add_string(struct blob_buf *buf, const char *name, const char *string) +{ + return blobmsg_add_field(buf, BLOBMSG_TYPE_STRING, name, string, strlen(string) + 1); +} + +void *blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array); + +static inline void * +blobmsg_open_array(struct blob_buf *buf, const char *name) +{ + return blobmsg_open_nested(buf, name, true); +} + +static inline void * +blobmsg_open_table(struct blob_buf *buf, const char *name) +{ + return blobmsg_open_nested(buf, name, false); +} + +static inline void +blobmsg_close_array(struct blob_buf *buf, void *cookie) +{ + blob_nest_end(buf, cookie); +} + +static inline void +blobmsg_close_table(struct blob_buf *buf, void *cookie) +{ + blob_nest_end(buf, cookie); +} + +static inline int blobmsg_buf_init(struct blob_buf *buf) +{ + return blob_buf_init(buf, BLOBMSG_TYPE_TABLE); +} + +#endif diff --git a/examples/blobmsg-example.c b/examples/blobmsg-example.c new file mode 100644 index 0000000..c88f53a --- /dev/null +++ b/examples/blobmsg-example.c @@ -0,0 +1,163 @@ +#include + +#include "blobmsg.h" + +static const char *indent_str = "\t\t\t\t\t\t\t\t\t\t\t\t\t"; + +#define indent_printf(indent, ...) do { \ + if (indent > 0) \ + fwrite(indent_str, indent, 1, stderr); \ + fprintf(stderr, __VA_ARGS__); \ +} while(0) + +static void dump_attr_data(void *data, int len, int type, int indent, int next_indent); + +static void +dump_array(struct blob_attr *head, int len, int indent) +{ + struct blob_attr *attr; + + indent_printf(indent, "{\n"); + __blob_for_each_attr(attr, head, len) { + dump_attr_data(blob_data(attr), blob_len(attr), blob_id(attr), indent + 1, indent + 1); + } + indent_printf(indent, "}\n"); +} + +static void +dump_table(struct blob_attr *head, int len, int indent) +{ + struct blob_attr *attr, *last_attr; + struct blobmsg_hdr *hdr; + + indent_printf(indent, "{\n"); + __blob_for_each_attr(attr, head, len) { + hdr = blob_data(attr); + indent_printf(indent + 1, "%s : ", hdr->name); + dump_attr_data(blobmsg_data(attr), blobmsg_data_len(attr), blob_id(attr), 0, indent + 1); + last_attr = attr; + } + indent_printf(indent, "}\n"); +} + +static void dump_attr_data(void *data, int len, int type, int indent, int next_indent) +{ + switch(type) { + case BLOBMSG_TYPE_STRING: + indent_printf(indent, "%s\n", (char *) data); + break; + case BLOBMSG_TYPE_INT8: + indent_printf(indent, "%d\n", *(uint8_t *)data); + break; + case BLOBMSG_TYPE_INT16: + indent_printf(indent, "%d\n", *(uint16_t *)data); + break; + case BLOBMSG_TYPE_INT32: + indent_printf(indent, "%d\n", *(uint32_t *)data); + break; + case BLOBMSG_TYPE_INT64: + indent_printf(indent, "%lld\n", *(uint64_t *)data); + break; + case BLOBMSG_TYPE_TABLE: + if (!indent) + indent_printf(indent, "\n"); + dump_table(data, len, next_indent); + break; + case BLOBMSG_TYPE_ARRAY: + if (!indent) + indent_printf(indent, "\n"); + dump_array(data, len, next_indent); + break; + } +} + +enum { + FOO_MESSAGE, + FOO_LIST, + FOO_TESTDATA +}; + +static const struct blobmsg_policy pol[] = { + [FOO_MESSAGE] = { + .name = "message", + .type = BLOBMSG_TYPE_STRING, + }, + [FOO_LIST] = { + .name = "list", + .type = BLOBMSG_TYPE_ARRAY, + }, + [FOO_TESTDATA] = { + .name = "testdata", + .type = BLOBMSG_TYPE_TABLE, + }, +}; + +#ifndef ARRAY_SIZE +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) +#endif + +static void dump_message(struct blob_buf *buf) +{ + struct blob_attr *tb[ARRAY_SIZE(pol)]; + + if (blobmsg_parse(pol, ARRAY_SIZE(pol), tb, blob_data(buf->head), blob_len(buf->head)) != 0) { + fprintf(stderr, "Parse failed\n"); + return; + } + if (tb[FOO_MESSAGE]) + fprintf(stderr, "Message: %s\n", (char *) blobmsg_data(tb[FOO_MESSAGE])); + + if (tb[FOO_LIST]) { + fprintf(stderr, "List: "); + dump_array(blobmsg_data(tb[FOO_LIST]), blob_len(tb[FOO_LIST]), 0); + } + if (tb[FOO_TESTDATA]) { + fprintf(stderr, "Testdata: "); + dump_table(blobmsg_data(tb[FOO_TESTDATA]), blob_len(tb[FOO_TESTDATA]), 0); + } +} + +static void +fill_message(struct blob_buf *buf) +{ + void *tbl; +#if 0 + int i; +#endif + + blobmsg_add_string(buf, "message", "Hello, world!"); + + tbl = blobmsg_open_array(buf, "list"); + blobmsg_add_u32(buf, NULL, 0); + blobmsg_add_u32(buf, NULL, 1); + blobmsg_add_u32(buf, NULL, 2); + blobmsg_close_table(buf, tbl); + + tbl = blobmsg_open_table(buf, "testdata"); + blobmsg_add_u32(buf, "hello", 1); + blobmsg_add_string(buf, "world", "2"); + blobmsg_close_table(buf, tbl); + +#if 0 + for (i = 0; i < buf->buflen; i++) { + if (i % 0x10 == 0) + fprintf(stderr, "\n"); + fprintf(stderr, "%02x ", ((uint8_t *) buf->buf)[i]); + } + fprintf(stderr, "\n"); +#endif +} + +int main(int argc, char **argv) +{ + static struct blob_buf buf; + + blobmsg_buf_init(&buf); + fill_message(&buf); + dump_message(&buf); + + if (buf.buf) + free(buf.buf); + + return 0; +} diff --git a/examples/uhtbl-test.c b/examples/uhtbl-test.c new file mode 100644 index 0000000..d8f2f32 --- /dev/null +++ b/examples/uhtbl-test.c @@ -0,0 +1,99 @@ +#include "../hash.h" +#include "../uhtbl.h" +#include +#include + +struct mybucket { + uhtbl_head_t __head; + long double mydata; +}; + +int main() { + printf("%i\n", (int)sizeof(struct mybucket)); + + uhtbl_t tbl; + uhtbl_init(&tbl, sizeof(struct mybucket), 16, hash_murmur2, NULL); + struct mybucket *bucket; + + const char *t[] = {"null", "eins", "zwei", "drei", "vier", "fünf", "sechs", + "sieben", "acht", "neun", "zehn", "elf", "zwölf", "dreizehn", + "vierzehn", "fünfzehn", "sechzehn", "siebzehn", "achtzehn", + "neunzehn", "zwanzig", "einundzwanzig", "zweiundzwanzig", + "dreiundzwanzig", "virundzwanzig", "fünfundzwanzig", "sechsundzwanzig", + "siebenundzwanzig", "achtundzwanzig", "neunundzwanzig", "dreißig", + "einunddreißig", "zweiunddreißig"}; + for (int i = 0; i < 33; i++) { + bucket = (struct mybucket*)uhtbl_set(&tbl, t[i], strlen(t[i])); + bucket->mydata = i; + } + + uint32_t iter = 0; + while ((bucket = (struct mybucket*)uhtbl_next(&tbl, &iter))) { + printf("%i\t", (int)bucket->mydata); + } + printf("\nSize: %i, Used: %i\n\n", tbl.size, tbl.used); + + for (int i = 0; i < 33; i++) { + bucket = (struct mybucket*)uhtbl_set(&tbl, 0, i); + bucket->mydata = i; + } + + iter = 0; + while ((bucket = (struct mybucket*)uhtbl_next(&tbl, &iter))) { + printf("%i\t", (int)bucket->mydata); + } + printf("\nSize: %i, Used: %i\n\n", tbl.size, tbl.used); + + for (int i = 0; i < 33; i++) { + if (uhtbl_unset(&tbl, 0, i)) { + printf("Unset failed %i\n", i); + } + if (uhtbl_unset(&tbl, t[i], strlen(t[i]))) { + printf("Unset failed %s\n", t[i]); + } + } + + iter = 0; + while ((bucket = (struct mybucket*)uhtbl_next(&tbl, &iter))) { + printf("%i\t", (int)bucket->mydata); + } + printf("\nSize: %i, Used: %i\n\n", tbl.size, tbl.used); + + for (int i = 0; i < 33; i++) { + bucket = (struct mybucket*)uhtbl_set(&tbl, t[i], strlen(t[i])); + bucket->mydata = i; + } + + for (int i = 0; i < 33; i++) { + bucket =(struct mybucket*) uhtbl_set(&tbl, 0, i); + bucket->mydata = i; + } + + for (int i = 0; i < 33; i++) { + bucket = (struct mybucket*)uhtbl_set(&tbl, t[i], strlen(t[i])); + bucket->mydata = i; + } + + for (int i = 0; i < 33; i++) { + bucket = (struct mybucket*)uhtbl_set(&tbl, 0, i); + bucket->mydata = i; + } + + iter = 0; + while ((bucket = (struct mybucket*)uhtbl_next(&tbl, &iter))) { + printf("%i\t", (int)bucket->mydata); + } + printf("\nSize: %i, Used: %i\n\n", tbl.size, tbl.used); + + for (int i = 0; i < 33; i++) { + bucket = (struct mybucket*)uhtbl_get(&tbl, t[i], strlen(t[i])); + printf("%i\t", (int)bucket->mydata); + bucket = (struct mybucket*)uhtbl_get(&tbl, 0, i); + printf("%i\t", (int)bucket->mydata); + } + printf("\nSize: %i, Used: %i\n\n", tbl.size, tbl.used); + + uhtbl_finalize(&tbl); + + return 0; +} diff --git a/hash.c b/hash.c new file mode 100644 index 0000000..16a0655 --- /dev/null +++ b/hash.c @@ -0,0 +1,54 @@ +#include +#include +#include "hash.h" + +//----------------------------------------------------------------------------- +// MurmurHashNeutral2, by Austin Appleby + +// Same as MurmurHash2, but endian- and alignment-neutral. +uint32_t hash_murmur2(const void * key, int len) +{ + const unsigned int seed = 0xdeadc0de; + const unsigned int m = 0x5bd1e995; + const int r = 24; + + unsigned int h = seed ^ len; + + const unsigned char * data = (const unsigned char *)key; + + while(len >= 4) + { + unsigned int k; + + k = data[0]; + k |= data[1] << 8; + k |= data[2] << 16; + k |= data[3] << 24; + + k *= m; + k ^= k >> r; + k *= m; + + h *= m; + h ^= k; + + data += 4; + len -= 4; + } + + switch(len) + { + case 3: h ^= data[2] << 16; + case 2: h ^= data[1] << 8; + case 1: h ^= data[0]; + h *= m; + }; + + h ^= h >> 13; + h *= m; + h ^= h >> 15; + + return h; +} + + diff --git a/hash.h b/hash.h new file mode 100644 index 0000000..82b7d3c --- /dev/null +++ b/hash.h @@ -0,0 +1,8 @@ +#ifndef _HASH_H__ +#define _HASH_H__ + +#include + +uint32_t hash_murmur2(const void * key, int len); + +#endif diff --git a/list.h b/list.h new file mode 100644 index 0000000..2959a06 --- /dev/null +++ b/list.h @@ -0,0 +1,601 @@ +#ifndef _LINUX_LIST_H +#define _LINUX_LIST_H + +#include +/** + * container_of - cast a member of a structure out to the containing structure + * @ptr: the pointer to the member. + * @type: the type of the container struct this is embedded in. + * @member: the name of the member within the struct. + * + */ +#ifndef container_of +#define container_of(ptr, type, member) ( \ + (type *)( (char *)ptr - offsetof(type,member) )) +#endif + + +/* + * Simple doubly linked list implementation. + * + * Some of the internal functions ("__xxx") are useful when + * manipulating whole lists rather than single entries, as + * sometimes we already know the next/prev entries and we can + * generate better code by using them directly rather than + * using the generic single-entry routines. + */ + +struct list_head { + struct list_head *next, *prev; +}; + +#define LIST_HEAD_INIT(name) { &(name), &(name) } + +#define LIST_HEAD(name) \ + struct list_head name = LIST_HEAD_INIT(name) + +static inline void INIT_LIST_HEAD(struct list_head *list) +{ + list->next = list; + list->prev = list; +} + +/* + * Insert a new entry between two known consecutive entries. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +static inline void __list_add(struct list_head *new, + struct list_head *prev, + struct list_head *next) +{ + next->prev = new; + new->next = next; + new->prev = prev; + prev->next = new; +} + +/** + * list_add - add a new entry + * @new: new entry to be added + * @head: list head to add it after + * + * Insert a new entry after the specified head. + * This is good for implementing stacks. + */ +static inline void list_add(struct list_head *new, struct list_head *head) +{ + __list_add(new, head, head->next); +} + + +/** + * list_add_tail - add a new entry + * @new: new entry to be added + * @head: list head to add it before + * + * Insert a new entry before the specified head. + * This is useful for implementing queues. + */ +static inline void list_add_tail(struct list_head *new, struct list_head *head) +{ + __list_add(new, head->prev, head); +} + + +/* + * Delete a list entry by making the prev/next entries + * point to each other. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +static inline void __list_del(struct list_head * prev, struct list_head * next) +{ + next->prev = prev; + prev->next = next; +} + +/** + * list_del - deletes entry from list. + * @entry: the element to delete from the list. + * Note: list_empty() on entry does not return true after this, the entry is + * in an undefined state. + */ +static inline void list_del(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); + entry->next = NULL; + entry->prev = NULL; +} + +/** + * list_replace - replace old entry by new one + * @old : the element to be replaced + * @new : the new element to insert + * + * If @old was empty, it will be overwritten. + */ +static inline void list_replace(struct list_head *old, + struct list_head *new) +{ + new->next = old->next; + new->next->prev = new; + new->prev = old->prev; + new->prev->next = new; +} + +static inline void list_replace_init(struct list_head *old, + struct list_head *new) +{ + list_replace(old, new); + INIT_LIST_HEAD(old); +} + +/** + * list_del_init - deletes entry from list and reinitialize it. + * @entry: the element to delete from the list. + */ +static inline void list_del_init(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); + INIT_LIST_HEAD(entry); +} + +/** + * list_move - delete from one list and add as another's head + * @list: the entry to move + * @head: the head that will precede our entry + */ +static inline void list_move(struct list_head *list, struct list_head *head) +{ + __list_del(list->prev, list->next); + list_add(list, head); +} + +/** + * list_move_tail - delete from one list and add as another's tail + * @list: the entry to move + * @head: the head that will follow our entry + */ +static inline void list_move_tail(struct list_head *list, + struct list_head *head) +{ + __list_del(list->prev, list->next); + list_add_tail(list, head); +} + +/** + * list_is_last - tests whether @list is the last entry in list @head + * @list: the entry to test + * @head: the head of the list + */ +static inline int list_is_last(const struct list_head *list, + const struct list_head *head) +{ + return list->next == head; +} + +/** + * list_empty - tests whether a list is empty + * @head: the list to test. + */ +static inline int list_empty(const struct list_head *head) +{ + return head->next == head; +} + +/** + * list_empty_careful - tests whether a list is empty and not being modified + * @head: the list to test + * + * Description: + * tests whether a list is empty _and_ checks that no other CPU might be + * in the process of modifying either member (next or prev) + * + * NOTE: using list_empty_careful() without synchronization + * can only be safe if the only activity that can happen + * to the list entry is list_del_init(). Eg. it cannot be used + * if another CPU could re-list_add() it. + */ +static inline int list_empty_careful(const struct list_head *head) +{ + struct list_head *next = head->next; + return (next == head) && (next == head->prev); +} + +static inline void __list_splice(struct list_head *list, + struct list_head *head) +{ + struct list_head *first = list->next; + struct list_head *last = list->prev; + struct list_head *at = head->next; + + first->prev = head; + head->next = first; + + last->next = at; + at->prev = last; +} + +/** + * list_splice - join two lists + * @list: the new list to add. + * @head: the place to add it in the first list. + */ +static inline void list_splice(struct list_head *list, struct list_head *head) +{ + if (!list_empty(list)) + __list_splice(list, head); +} + +/** + * list_splice_init - join two lists and reinitialise the emptied list. + * @list: the new list to add. + * @head: the place to add it in the first list. + * + * The list at @list is reinitialised + */ +static inline void list_splice_init(struct list_head *list, + struct list_head *head) +{ + if (!list_empty(list)) { + __list_splice(list, head); + INIT_LIST_HEAD(list); + } +} + +/** + * list_entry - get the struct for this entry + * @ptr: the &struct list_head pointer. + * @type: the type of the struct this is embedded in. + * @member: the name of the list_struct within the struct. + */ +#define list_entry(ptr, type, member) \ + container_of(ptr, type, member) + +/** + * list_first_entry - get the first element from a list + * @ptr: the list head to take the element from. + * @type: the type of the struct this is embedded in. + * @member: the name of the list_struct within the struct. + * + * Note, that list is expected to be not empty. + */ +#define list_first_entry(ptr, type, member) \ + list_entry((ptr)->next, type, member) + +/** + * list_for_each - iterate over a list + * @pos: the &struct list_head to use as a loop cursor. + * @head: the head for your list. + */ +#define list_for_each(pos, head) \ + for (pos = (head)->next; pos != (head); \ + pos = pos->next) + +/** + * __list_for_each - iterate over a list + * @pos: the &struct list_head to use as a loop cursor. + * @head: the head for your list. + * + * This variant differs from list_for_each() in that it's the + * simplest possible list iteration code, no prefetching is done. + * Use this for code that knows the list to be very short (empty + * or 1 entry) most of the time. + */ +#define __list_for_each(pos, head) \ + for (pos = (head)->next; pos != (head); pos = pos->next) + +/** + * list_for_each_prev - iterate over a list backwards + * @pos: the &struct list_head to use as a loop cursor. + * @head: the head for your list. + */ +#define list_for_each_prev(pos, head) \ + for (pos = (head)->prev; pos != (head); \ + pos = pos->prev) + +/** + * list_for_each_safe - iterate over a list safe against removal of list entry + * @pos: the &struct list_head to use as a loop cursor. + * @n: another &struct list_head to use as temporary storage + * @head: the head for your list. + */ +#define list_for_each_safe(pos, n, head) \ + for (pos = (head)->next, n = pos->next; pos != (head); \ + pos = n, n = pos->next) + +/** + * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry + * @pos: the &struct list_head to use as a loop cursor. + * @n: another &struct list_head to use as temporary storage + * @head: the head for your list. + */ +#define list_for_each_prev_safe(pos, n, head) \ + for (pos = (head)->prev, n = pos->prev; \ + pos != (head); \ + pos = n, n = pos->prev) + +/** + * list_for_each_entry - iterate over list of given type + * @pos: the type * to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + */ +#define list_for_each_entry(pos, head, member) \ + for (pos = list_entry((head)->next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = list_entry(pos->member.next, typeof(*pos), member)) + +/** + * list_for_each_entry_reverse - iterate backwards over list of given type. + * @pos: the type * to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + */ +#define list_for_each_entry_reverse(pos, head, member) \ + for (pos = list_entry((head)->prev, typeof(*pos), member); \ + &pos->member != (head); \ + pos = list_entry(pos->member.prev, typeof(*pos), member)) + +/** + * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue() + * @pos: the type * to use as a start point + * @head: the head of the list + * @member: the name of the list_struct within the struct. + * + * Prepares a pos entry for use as a start point in list_for_each_entry_continue(). + */ +#define list_prepare_entry(pos, head, member) \ + ((pos) ? : list_entry(head, typeof(*pos), member)) + +/** + * list_for_each_entry_continue - continue iteration over list of given type + * @pos: the type * to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Continue to iterate over list of given type, continuing after + * the current position. + */ +#define list_for_each_entry_continue(pos, head, member) \ + for (pos = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = list_entry(pos->member.next, typeof(*pos), member)) + +/** + * list_for_each_entry_continue_reverse - iterate backwards from the given point + * @pos: the type * to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Start to iterate over list of given type backwards, continuing after + * the current position. + */ +#define list_for_each_entry_continue_reverse(pos, head, member) \ + for (pos = list_entry(pos->member.prev, typeof(*pos), member); \ + &pos->member != (head); \ + pos = list_entry(pos->member.prev, typeof(*pos), member)) + +/** + * list_for_each_entry_from - iterate over list of given type from the current point + * @pos: the type * to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Iterate over list of given type, continuing from current position. + */ +#define list_for_each_entry_from(pos, head, member) \ + for (; &pos->member != (head); \ + pos = list_entry(pos->member.next, typeof(*pos), member)) + +/** + * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as temporary storage + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + */ +#define list_for_each_entry_safe(pos, n, head, member) \ + for (pos = list_entry((head)->next, typeof(*pos), member), \ + n = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.next, typeof(*n), member)) + +/** + * list_for_each_entry_safe_continue + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as temporary storage + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Iterate over list of given type, continuing after current point, + * safe against removal of list entry. + */ +#define list_for_each_entry_safe_continue(pos, n, head, member) \ + for (pos = list_entry(pos->member.next, typeof(*pos), member), \ + n = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.next, typeof(*n), member)) + +/** + * list_for_each_entry_safe_from + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as temporary storage + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Iterate over list of given type from current point, safe against + * removal of list entry. + */ +#define list_for_each_entry_safe_from(pos, n, head, member) \ + for (n = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.next, typeof(*n), member)) + +/** + * list_for_each_entry_safe_reverse + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as temporary storage + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Iterate backwards over list of given type, safe against removal + * of list entry. + */ +#define list_for_each_entry_safe_reverse(pos, n, head, member) \ + for (pos = list_entry((head)->prev, typeof(*pos), member), \ + n = list_entry(pos->member.prev, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.prev, typeof(*n), member)) + +/* + * Double linked lists with a single pointer list head. + * Mostly useful for hash tables where the two pointer list head is + * too wasteful. + * You lose the ability to access the tail in O(1). + */ + +struct hlist_head { + struct hlist_node *first; +}; + +struct hlist_node { + struct hlist_node *next, **pprev; +}; + +#define HLIST_HEAD_INIT { .first = NULL } +#define HLIST_HEAD(name) struct hlist_head name = { .first = NULL } +#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL) +static inline void INIT_HLIST_NODE(struct hlist_node *h) +{ + h->next = NULL; + h->pprev = NULL; +} + +static inline int hlist_unhashed(const struct hlist_node *h) +{ + return !h->pprev; +} + +static inline int hlist_empty(const struct hlist_head *h) +{ + return !h->first; +} + +static inline void __hlist_del(struct hlist_node *n) +{ + struct hlist_node *next = n->next; + struct hlist_node **pprev = n->pprev; + *pprev = next; + if (next) + next->pprev = pprev; +} + +static inline void hlist_del(struct hlist_node *n) +{ + __hlist_del(n); + n->next = NULL; + n->pprev = NULL; +} + +static inline void hlist_del_init(struct hlist_node *n) +{ + if (!hlist_unhashed(n)) { + __hlist_del(n); + INIT_HLIST_NODE(n); + } +} + + +static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h) +{ + struct hlist_node *first = h->first; + n->next = first; + if (first) + first->pprev = &n->next; + h->first = n; + n->pprev = &h->first; +} + + +/* next must be != NULL */ +static inline void hlist_add_before(struct hlist_node *n, + struct hlist_node *next) +{ + n->pprev = next->pprev; + n->next = next; + next->pprev = &n->next; + *(n->pprev) = n; +} + +static inline void hlist_add_after(struct hlist_node *n, + struct hlist_node *next) +{ + next->next = n->next; + n->next = next; + next->pprev = &n->next; + + if(next->next) + next->next->pprev = &next->next; +} + +#define hlist_entry(ptr, type, member) container_of(ptr,type,member) + +#define hlist_for_each(pos, head) \ + for (pos = (head)->first; pos; pos = pos->next) + +#define hlist_for_each_safe(pos, n, head) \ + for (pos = (head)->first; pos; pos = n) + +/** + * hlist_for_each_entry - iterate over list of given type + * @tpos: the type * to use as a loop cursor. + * @pos: the &struct hlist_node to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the hlist_node within the struct. + */ +#define hlist_for_each_entry(tpos, pos, head, member) \ + for (pos = (head)->first; pos && \ + ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ + pos = pos->next) + +/** + * hlist_for_each_entry_continue - iterate over a hlist continuing after current point + * @tpos: the type * to use as a loop cursor. + * @pos: the &struct hlist_node to use as a loop cursor. + * @member: the name of the hlist_node within the struct. + */ +#define hlist_for_each_entry_continue(tpos, pos, member) \ + for (pos = (pos)->next; pos && \ + ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ + pos = pos->next) + +/** + * hlist_for_each_entry_from - iterate over a hlist continuing from current point + * @tpos: the type * to use as a loop cursor. + * @pos: the &struct hlist_node to use as a loop cursor. + * @member: the name of the hlist_node within the struct. + */ +#define hlist_for_each_entry_from(tpos, pos, member) \ + for (; pos && \ + ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ + pos = pos->next) + +/** + * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry + * @tpos: the type * to use as a loop cursor. + * @pos: the &struct hlist_node to use as a loop cursor. + * @n: another &struct hlist_node to use as temporary storage + * @head: the head for your list. + * @member: the name of the hlist_node within the struct. + */ +#define hlist_for_each_entry_safe(tpos, pos, n, head, member) \ + for (pos = (head)->first; \ + pos && ({ n = pos->next; 1; }) && \ + ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ + pos = n) + +#endif diff --git a/uapi.h b/uapi.h new file mode 100644 index 0000000..db01949 --- /dev/null +++ b/uapi.h @@ -0,0 +1,36 @@ +/** + * uapi - Common API macros + * Copyright (C) 2010 Steven Barth + * Copyright (C) 2010 John Crispin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#ifndef UAPI_H_ +#define UAPI_H_ + +#define API_CTOR __attribute__((constructor)) +#define API_DTOR __attribute__((destructor)) +#define API_HIDDEN __attribute__((visibility("hidden"))) +#define API_INTERNAL __attribute__((visibility("internal"))) +#define API_DEFAULT __attribute__((visibility("default"))) +#define API_ALLOC __attribute__((malloc)) +#define API_NONNULL(...) __attribute__((nonnull(__VA_ARGS_))) +#define API_FORCEINLINE __attribute__((always_inline)) inline + +#define API_PACKED __attribute__((packed)) +#define API_CLEANUP(gc) __attribute__((cleanup(gc))) +#endif /* UAPI_H_ */ diff --git a/ucix.c b/ucix.c new file mode 100644 index 0000000..72e8052 --- /dev/null +++ b/ucix.c @@ -0,0 +1,176 @@ +/* + * ucix + * Copyright (C) 2010 John Crispin + * Copyright (C) 2010 Steven Barth + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#include +#include + +#include "ucix.h" + +struct uci_ptr uci_ptr; + +int ucix_get_ptr(struct uci_context *ctx, const char *p, const char *s, const char *o, const char *t) +{ + memset(&uci_ptr, 0, sizeof(uci_ptr)); + uci_ptr.package = p; + uci_ptr.section = s; + uci_ptr.option = o; + uci_ptr.value = t; + return uci_lookup_ptr(ctx, &uci_ptr, NULL, true); +} + +struct uci_context* ucix_init(const char *config_file, int state) +{ + struct uci_context *ctx = uci_alloc_context(); + uci_set_confdir(ctx, "/etc/config"); + if(state) + uci_set_savedir(ctx, "/var/state/"); + else + uci_set_savedir(ctx, "/tmp/.uci/"); + if(uci_load(ctx, config_file, NULL) != UCI_OK) + { + printf("%s/%s is missing or corrupt\n", ctx->confdir, config_file); + return NULL; + } + return ctx; +} + +struct uci_context* ucix_init_path(const char *vpath, const char *config_file, int state) +{ + struct uci_context *ctx; + char buf[256]; + if(!vpath) + return ucix_init(config_file, state); + ctx = uci_alloc_context(); + buf[255] = '\0'; + snprintf(buf, 255, "%s%s", vpath, "/etc/config"); + uci_set_confdir(ctx, buf); + snprintf(buf, 255, "%s%s", vpath, (state)?("/var/state"):("/tmp/.uci")); + uci_add_delta_path(ctx, buf); + if(uci_load(ctx, config_file, NULL) != UCI_OK) + { + printf("%s/%s is missing or corrupt\n", ctx->confdir, config_file); + return NULL; + } + return ctx; +} + +int ucix_get_option_list(struct uci_context *ctx, const char *p, + const char *s, const char *o, struct list_head *l) +{ + struct uci_element *e = NULL; + if(ucix_get_ptr(ctx, p, s, o, NULL)) + return 1; + if (!(uci_ptr.flags & UCI_LOOKUP_COMPLETE)) + return 1; + e = uci_ptr.last; + switch (e->type) + { + case UCI_TYPE_OPTION: + switch(uci_ptr.o->type) { + case UCI_TYPE_LIST: + uci_foreach_element(&uci_ptr.o->v.list, e) + { + struct ucilist *ul = malloc(sizeof(struct ucilist)); + ul->val = strdup((e->name)?(e->name):("")); + list_add_tail(&ul->list, l); + } + break; + default: + break; + } + break; + default: + return 1; + } + + return 0; +} + +char* ucix_get_option(struct uci_context *ctx, const char *p, const char *s, const char *o) +{ + struct uci_element *e = NULL; + const char *value = NULL; + if(ucix_get_ptr(ctx, p, s, o, NULL)) + return NULL; + if (!(uci_ptr.flags & UCI_LOOKUP_COMPLETE)) + return NULL; + e = uci_ptr.last; + switch (e->type) + { + case UCI_TYPE_SECTION: + value = uci_to_section(e)->type; + break; + case UCI_TYPE_OPTION: + switch(uci_ptr.o->type) { + case UCI_TYPE_STRING: + value = uci_ptr.o->v.string; + break; + default: + value = NULL; + break; + } + break; + default: + return 0; + } + + return (value) ? (strdup(value)):(NULL); +} + +void ucix_add_list(struct uci_context *ctx, const char *p, const char *s, const char *o, struct list_head *vals) +{ + struct list_head *q; + list_for_each(q, vals) + { + struct ucilist *ul = container_of(q, struct ucilist, list); + if(ucix_get_ptr(ctx, p, s, o, (ul->val)?(ul->val):(""))) + return; + uci_add_list(ctx, &uci_ptr); + } +} + +void ucix_for_each_section_type(struct uci_context *ctx, + const char *p, const char *t, + void (*cb)(const char*, void*), void *priv) +{ + struct uci_element *e; + if(ucix_get_ptr(ctx, p, NULL, NULL, NULL)) + return; + uci_foreach_element(&uci_ptr.p->sections, e) + if (!strcmp(t, uci_to_section(e)->type)) + cb(e->name, priv); +} + +void ucix_for_each_section_option(struct uci_context *ctx, + const char *p, const char *s, + void (*cb)(const char*, const char*, void*), void *priv) +{ + struct uci_element *e; + if(ucix_get_ptr(ctx, p, s, NULL, NULL)) + return; + uci_foreach_element(&uci_ptr.s->options, e) + { + struct uci_option *o = uci_to_option(e); + cb(o->e.name, o->v.string, priv); + } +} + + diff --git a/ucix.h b/ucix.h new file mode 100644 index 0000000..80f0f62 --- /dev/null +++ b/ucix.h @@ -0,0 +1,133 @@ +/* + * ucix + * Copyright (C) 2010 John Crispin + * Copyright (C) 2010 Steven Barth + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#ifndef _UCI_H__ +#define _UCI_H__ +#include +#include "list.h" + +struct ucilist { + struct list_head list; + char *val; +}; + +extern struct uci_ptr uci_ptr; + +int ucix_get_ptr(struct uci_context *ctx, const char *p, + const char *s, const char *o, const char *t); +struct uci_context* ucix_init(const char *config_file, int state); +struct uci_context* ucix_init_path(const char *vpath, const char *config_file, int state); +int ucix_save_state(struct uci_context *ctx, const char *p); +char* ucix_get_option(struct uci_context *ctx, + const char *p, const char *s, const char *o); +int ucix_get_option_list(struct uci_context *ctx, const char *p, + const char *s, const char *o, struct list_head *l); +void ucix_for_each_section_type(struct uci_context *ctx, + const char *p, const char *t, + void (*cb)(const char*, void*), void *priv); +void ucix_for_each_section_option(struct uci_context *ctx, + const char *p, const char *s, + void (*cb)(const char*, const char*, void*), void *priv); +void ucix_add_list(struct uci_context *ctx, const char *p, + const char *s, const char *o, struct list_head *vals); + +static inline void ucix_del(struct uci_context *ctx, const char *p, const char *s, const char *o) +{ + if (!ucix_get_ptr(ctx, p, s, o, NULL)) + uci_delete(ctx, &uci_ptr); +} + +static inline void ucix_revert(struct uci_context *ctx, const char *p, const char *s, const char *o) +{ + if (!ucix_get_ptr(ctx, p, s, o, NULL)) + uci_revert(ctx, &uci_ptr); +} + +static inline void ucix_add_list_single(struct uci_context *ctx, const char *p, const char *s, const char *o, const char *t) +{ + if (ucix_get_ptr(ctx, p, s, o, t)) + return; + uci_add_list(ctx, &uci_ptr); +} + +static inline void ucix_add_option(struct uci_context *ctx, const char *p, const char *s, const char *o, const char *t) +{ + if (ucix_get_ptr(ctx, p, s, o, t)) + return; + uci_set(ctx, &uci_ptr); +} + +static inline void ucix_add_section(struct uci_context *ctx, const char *p, const char *s, const char *t) +{ + if(ucix_get_ptr(ctx, p, s, NULL, t)) + return; + uci_set(ctx, &uci_ptr); +} + +static inline void ucix_add_option_int(struct uci_context *ctx, const char *p, const char *s, const char *o, int t) +{ + char tmp[64]; + snprintf(tmp, 64, "%d", t); + ucix_add_option(ctx, p, s, o, tmp); +} + +static inline void ucix_add_list_single_int(struct uci_context *ctx, const char *p, const char *s, const char *o, const int t) +{ + char tmp[64]; + snprintf(tmp, 64, "%d", t); + ucix_add_list_single(ctx, p, s, o, tmp); +} + +static inline int ucix_get_option_int(struct uci_context *ctx, const char *p, const char *s, const char *o, int def) +{ + char *tmp = ucix_get_option(ctx, p, s, o); + int ret = def; + + if (tmp) + { + ret = atoi(tmp); + free(tmp); + } + return ret; +} + +static inline int ucix_save(struct uci_context *ctx, const char *p) +{ + if(ucix_get_ptr(ctx, p, NULL, NULL, NULL)) + return 1; + uci_save(ctx, uci_ptr.p); + return 0; +} + +static inline int ucix_commit(struct uci_context *ctx, const char *p) +{ + if(ucix_get_ptr(ctx, p, NULL, NULL, NULL)) + return 1; + return uci_commit(ctx, &uci_ptr.p, false); +} + +static inline void ucix_cleanup(struct uci_context *ctx) +{ + uci_free_context(ctx); +} + + +#endif diff --git a/uhtbl.c b/uhtbl.c new file mode 100644 index 0000000..9e119b8 --- /dev/null +++ b/uhtbl.c @@ -0,0 +1,340 @@ +/** + * uhtbl - Generic coalesced hash table implementation + * Copyright (C) 2010 Steven Barth + * Copyright (C) 2010 John Crispin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#include +#include +#include +#include "uhtbl.h" + +/* Forward static helpers */ +UHTBL_INLINE uhtbl_size_t _uhtbl_address(uhtbl_t *tbl, uhtbl_bucket_t *bucket); +UHTBL_INLINE uhtbl_bucket_t* _uhtbl_bucket(uhtbl_t *tbl, uhtbl_size_t address); +static uhtbl_bucket_t* _uhtbl_allocate(uhtbl_t *tbl); +static uhtbl_bucket_t* _uhtbl_find(uhtbl_t *tbl, const void *key, +long len, uhtbl_bucket_t **previous, uhtbl_size_t *mainaddress); + + + +UHTBL_API int uhtbl_init(uhtbl_t *tbl, uint32_t bucketsize, +uhtbl_size_t sizehint, uhtbl_hash_t *fct_hash, uhtbl_gc_t *fct_gc) { + sizehint = (sizehint) ? sizehint : UHTBL_MINIMUMSIZE; + tbl->bucketsize = bucketsize; + tbl->fct_hash = fct_hash; + tbl->fct_gc = fct_gc; + if (!tbl->fct_hash || tbl->bucketsize < sizeof(uhtbl_bucket_t)) { + return UHTBL_EINVAL; + } + tbl->payload = 0; + tbl->buckets = NULL; + tbl->used = 0; + + return uhtbl_resize(tbl, sizehint); +} + +UHTBL_API void uhtbl_clear(uhtbl_t *tbl) { + for (uhtbl_size_t i = 0; i < tbl->size; i++) { + uhtbl_bucket_t *bucket = _uhtbl_bucket(tbl, i); + if (tbl->fct_gc && bucket->head.flags & UHTBL_FLAG_OCCUPIED) { + tbl->fct_gc(bucket); + } + bucket->head.flags = 0; + } + tbl->used = 0; + tbl->nextfree = tbl->size - 1; +} + +UHTBL_API void* uhtbl_get (uhtbl_t *tbl, const void *key, long len) { + return _uhtbl_find(tbl, key, len, NULL, NULL); +} + +UHTBL_API void* uhtbl_set (uhtbl_t *tbl, void *key, long len) { + int localkey = 0; + uint16_t keysize = len, flags; + if (!key) { /* Check whether key is treated as a pointer */ + key = &len; + keysize = sizeof(len); + localkey = 1; + } + + uhtbl_size_t mainaddr; + uhtbl_bucket_t *resolve, *match, *prev = NULL; + uhtbl_bucket_t *lookup = _uhtbl_find(tbl, key, keysize, &prev, &mainaddr); + + if (lookup) { + match = lookup; + flags = match->head.flags; + if (flags & UHTBL_FLAG_OCCUPIED) { /* We are replacing an entry */ + if (tbl->fct_gc) { + tbl->fct_gc(match); + } + tbl->used--; + } + } else { + match = prev; + flags = match->head.flags; + if ((flags & UHTBL_FLAG_STRANGER) + && _uhtbl_address(tbl, match) == mainaddr) { + /* Mainposition occupied by key with different hash -> move it away */ + + /* Find old prev and update its next pointer */ + if ((flags & UHTBL_FLAG_LOCALKEY)) { + _uhtbl_find(tbl, 0, + match->head.key.handle, &prev, NULL); + } else { + _uhtbl_find(tbl, match->head.key.ptr, + match->head.keysize, &prev, NULL); + } + + if (!(resolve = _uhtbl_allocate(tbl))) { + if (!uhtbl_resize(tbl, tbl->payload * UHTBL_GROWFACTOR)) { + return uhtbl_set(tbl, (localkey) ? NULL : key, len); + } else { + return NULL; + } + } + memcpy(resolve, match, tbl->bucketsize); /* Copy bucket data */ + prev->head.next = _uhtbl_address(tbl, resolve); + flags = 0; + } else if ((flags & UHTBL_FLAG_OCCUPIED) && + (match->head.keysize != keysize || memcmp((flags & UHTBL_FLAG_LOCALKEY) + ? &match->head.key.handle : match->head.key.ptr, key, keysize))) { + /* Mainposition has different key (but same hash) */ + if (!(resolve = _uhtbl_allocate(tbl))) { + if (!uhtbl_resize(tbl, tbl->payload * UHTBL_GROWFACTOR)) { + return uhtbl_set(tbl, (localkey) ? NULL : key, len); + } else { + return NULL; + } + } + + prev = match; + match = resolve; + flags = UHTBL_FLAG_STRANGER; /* We will not be in main position */ + prev->head.flags |= UHTBL_FLAG_WITHNEXT; /* Main now has next */ + prev->head.next = _uhtbl_address(tbl, match); /* main->next = us */ + } + } + + if (localkey) { + match->head.key.handle = len; + flags |= UHTBL_FLAG_LOCALKEY; + } else { + match->head.key.ptr = key; + flags &= ~UHTBL_FLAG_LOCALKEY; + } + match->head.keysize = keysize; + flags |= UHTBL_FLAG_OCCUPIED; + match->head.flags = flags; + + tbl->used++; + return match; +} + +UHTBL_API void* uhtbl_next(uhtbl_t *tbl, uhtbl_size_t *iter) { + for (; *iter < tbl->size; (*iter)++) { + if (_uhtbl_bucket(tbl, *iter)->head.flags & UHTBL_FLAG_OCCUPIED) { + return _uhtbl_bucket(tbl, (*iter)++); + } + } + return NULL; +} + +UHTBL_API int uhtbl_remove(uhtbl_t *tbl, uhtbl_head_t *head) { + void *key; + long len; + uhtbl_key(head, &key, &len); + return uhtbl_unset(tbl, key, len); +} + +UHTBL_API int uhtbl_unset(uhtbl_t *tbl, const void *key, long len) { + uhtbl_bucket_t *prev = NULL; + uhtbl_bucket_t *bucket = _uhtbl_find(tbl, key, len, &prev, NULL); + if (!bucket) { + return UHTBL_ENOENT; + } + + if (tbl->fct_gc) { + tbl->fct_gc(bucket); + } + + bucket->head.flags &= ~UHTBL_FLAG_OCCUPIED; + tbl->used--; + + /* If not in main position, get us out of the next-list */ + if (bucket->head.flags & UHTBL_FLAG_STRANGER) { + if (bucket->head.flags & UHTBL_FLAG_WITHNEXT) {/* We had next buckets */ + prev->head.next = bucket->head.next; /* Give them to out prev */ + } else { + prev->head.flags &= ~UHTBL_FLAG_WITHNEXT;/* We were the only next */ + } + bucket->head.flags = 0; + } + + uhtbl_size_t address = _uhtbl_address(tbl, bucket); + if (address > tbl->nextfree) { + tbl->nextfree = address; + } + + return UHTBL_OK; +} + +UHTBL_API int uhtbl_resize(uhtbl_t *tbl, uhtbl_size_t payload) { + uhtbl_size_t size = payload / UHTBL_PAYLOADFACTOR; + if (size < payload || size < tbl->used) { + return UHTBL_EINVAL; + } + if (payload == tbl->payload) { + return UHTBL_OK; + } + + void *buckets = calloc(size, tbl->bucketsize); + if (!buckets) { + return UHTBL_ENOMEM; + } + + uhtbl_t oldtbl; /* Save essentials of table for rehashing */ + oldtbl.buckets = tbl->buckets; + oldtbl.bucketsize = tbl->bucketsize; + oldtbl.size = tbl->size; + oldtbl.used = tbl->used; + + tbl->buckets = buckets; + tbl->payload = payload; + tbl->size = size; + tbl->used = 0; + tbl->nextfree = size - 1; + + if (oldtbl.used) { /* Rehash if table had entries before */ + uhtbl_size_t iter = 0; + uhtbl_bucket_t *old, *new; + while ((old = uhtbl_next(&oldtbl, &iter))) { + new = uhtbl_set(tbl, (old->head.flags & UHTBL_FLAG_LOCALKEY) + ? NULL : old->head.key.ptr, + (old->head.flags & UHTBL_FLAG_LOCALKEY) + ? old->head.key.handle : old->head.keysize); + new->head.user = old->head.user; + memcpy(((char*)new) + sizeof(uhtbl_head_t), + ((char*)old) + sizeof(uhtbl_head_t), + tbl->bucketsize - sizeof(uhtbl_head_t)); + } + } + + free(oldtbl.buckets); + return UHTBL_OK; +} + +UHTBL_API void uhtbl_finalize(uhtbl_t *tbl) { + uhtbl_clear(tbl); + free(tbl->buckets); + tbl->buckets = NULL; +} + +UHTBL_API void uhtbl_key(uhtbl_head_t *head, void **key, long *len) { + if (key) { + *key = (head->flags & UHTBL_FLAG_LOCALKEY) + ? NULL : head->key.ptr; + } + if (len) { + *len = (head->flags & UHTBL_FLAG_LOCALKEY) + ? head->key.handle : head->keysize; + } +} + +UHTBL_API void uhtbl_gc_key(void *bucket) { + void *key; + uhtbl_key(bucket, &key, NULL); + free(key); +} + + +/* Static auxiliary */ + +UHTBL_INLINE uhtbl_size_t _uhtbl_address(uhtbl_t *tbl, uhtbl_bucket_t *bucket) { + return ((uint8_t*)bucket - (uint8_t*)tbl->buckets) / tbl->bucketsize; +} + +UHTBL_INLINE uhtbl_bucket_t* _uhtbl_bucket(uhtbl_t *tbl, uhtbl_size_t address) { + return (uhtbl_bucket_t*) + ((uint8_t*)tbl->buckets + (address * tbl->bucketsize)); +} + +static uhtbl_bucket_t* _uhtbl_allocate(uhtbl_t *tbl) { + uhtbl_size_t address = tbl->nextfree; + do { + uhtbl_bucket_t *bucket = _uhtbl_bucket(tbl, address); + if (!(bucket->head.flags & UHTBL_FLAG_OCCUPIED)) { + if (bucket->head.flags & UHTBL_FLAG_WITHNEXT) { + /* Empty bucket still has a successor -> swap it with its */ + /* successor and return the old successor-bucket as free */ + uhtbl_bucket_t *old = bucket; + bucket = _uhtbl_bucket(tbl, old->head.next); + memcpy(old, bucket, tbl->bucketsize); + old->head.flags &= ~UHTBL_FLAG_STRANGER; /* sucessor now main */ + } + /* WARN: If set will ever fail in the future we'd take care here */ + tbl->nextfree = (address) ? address - 1 : 0; + return bucket; + } + } while(address--); + return NULL; +} + +static uhtbl_bucket_t* _uhtbl_find(uhtbl_t *tbl, const void *key, +long len, uhtbl_bucket_t **previous, uhtbl_size_t *mainaddress) { + uint16_t keysize = len; + if (!key) { + key = &len; + keysize = sizeof(len); + } + uhtbl_size_t address = tbl->fct_hash(key, keysize) % tbl->payload; + uhtbl_bucket_t *buck = _uhtbl_bucket(tbl, address); + if (mainaddress) { + *mainaddress = address; + if (!(buck->head.flags & UHTBL_FLAG_OCCUPIED)) { + return buck; + } + } + if (buck->head.flags & UHTBL_FLAG_STRANGER) { + if (previous) { + *previous = buck; + } + return NULL; + } + for (;; buck = _uhtbl_bucket(tbl, address)) { + if (buck->head.flags & UHTBL_FLAG_OCCUPIED + && buck->head.keysize == keysize + && !memcmp((buck->head.flags & UHTBL_FLAG_LOCALKEY) + ? &buck->head.key.handle : buck->head.key.ptr, key, keysize)) { + return buck; + } + if (!(buck->head.flags & UHTBL_FLAG_WITHNEXT)) { + if (previous) { + *previous = buck; + } + return NULL; + } + + address = buck->head.next; + if (previous) { + *previous = buck; + } + } +} diff --git a/uhtbl.h b/uhtbl.h new file mode 100644 index 0000000..55a791e --- /dev/null +++ b/uhtbl.h @@ -0,0 +1,375 @@ +/** + * uhtbl - Generic coalesced hash table implementation + * Copyright (C) 2010 Steven Barth + * Copyright (C) 2010 John Crispin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + */ +/** + * uhtbl is a coalesced cellared generic hash table implementation with the aim + * to be both small in code size and heap memory requirements. This hash table + * uses a hybrid approach called coalesced addressing which means that pointers + * to other buckets will be used in the case of a collisions. In this case no + * linked lists have to be used and less allocation calls have to be done. + * To improve performance this hash table carries a cellar for collision + * handling which is an additional address area that lies behind the + * hash-addressable space. + * + * Overhead (on x86 32bit): + * Bookkeeping: 32 Bytes (per hash table) + * Metadata: 12 Bytes including pointer to key and keysize (per bucket) + * + */ + +#ifndef UHTBL_H_ +#define UHTBL_H_ + + +/* compile-time configurables */ + +#ifndef UHTBL_PAYLOADFACTOR + #define UHTBL_PAYLOADFACTOR 0.86 +#endif + +#ifndef UHTBL_GROWFACTOR + #define UHTBL_GROWFACTOR 2 +#endif + +#ifndef UHTBL_MINIMUMSIZE + #define UHTBL_MINIMUMSIZE 16 +#endif + + +#include + +/* Internal flags and values */ +#define UHTBL_FLAG_OCCUPIED 0x01 +#define UHTBL_FLAG_STRANGER 0x02 +#define UHTBL_FLAG_WITHNEXT 0x04 +#define UHTBL_FLAG_LOCALKEY 0x08 +#define UHTBL_MAXIMUMSIZE 2147483648 + +/* Status codes */ +#define UHTBL_OK 0 +#define UHTBL_EINVAL -1 +#define UHTBL_ENOMEM -2 +#define UHTBL_ENOENT -3 + +/* API */ +#if __GNUC__ >= 4 + #ifndef UHTBL_API + #define UHTBL_API + #endif + #define UHTBL_INLINE static inline __attribute__((always_inline)) +#else + #ifndef UHTBL_API + #define UHTBL_API + #endif + #define UHTBL_INLINE static inline +#endif + + +typedef union uhtbl_key uhtbl_key_t; +typedef struct uhtbl_head uhtbl_head_t; +typedef struct uhtbl_bucket uhtbl_bucket_t; +typedef struct uhtbl_config uhtbl_config_t; +typedef struct uhtbl uhtbl_t; +typedef uint32_t uhtbl_size_t; + +typedef uhtbl_size_t(uhtbl_hash_t)(const void*, int len); +typedef void(uhtbl_gc_t)(void *bucket); + +union uhtbl_key { + void *ptr; + long handle; +}; + +struct uhtbl_head { + uint8_t user; + uint8_t flags; + uint16_t keysize; + uhtbl_size_t next; + uhtbl_key_t key; +}; + +struct uhtbl_bucket { + uhtbl_head_t head; +}; + +struct uhtbl { + uint32_t bucketsize; + uhtbl_size_t size; + uhtbl_size_t used; + uhtbl_size_t payload; + uhtbl_size_t nextfree; + uhtbl_hash_t *fct_hash; + uhtbl_gc_t *fct_gc; + void *buckets; +}; + +/** + * uhtbl_init() - Initialize a hash table. + * @tbl: hash table + * @bucketsize: size of a bucket + * @sizehint: estimated maximum of needed buckets (optional) + * @fct_hash: hash function + * @fct_gc: bucket garbage collector (optional) + * + * Initializes a new hash table and preallocates memory. + * + * bucketsize is the size in Bytes each bucket will use but note the following: + * Each bucket needs to begin with a struct uhtbl_head_t that keeps its metadata + * in addition to the payload you want it to carry. You are advised to define a + * bucket struct with the first element being a uhtbl_head_t followed by your + * desired payload and pass the size of this struct to bucketsize. + * + * sizehint is a hint on how many distinct entries will be stored in the hash + * table. This will be used to preallocate space for the buckets and is useful + * if you know how many entries will be stored in the hash table as it avoids + * expensive rehashing cycles. sizehint should be a power of 2. + * + * fct_hash is the hash function used. It takes a constant void pointer and a + * integer as size parameter and returns an unsigned (32bit) int. + * + * fct_gc is the garbage collector for buckets. Every time a bucket gets unset + * or the hash table gets cleared or finalized the garbage collector function + * taking a pointer to a bucket will take care of doing any finalization for + * the buckets' payload and key data. You may use uhtbl_key() to get a reference + * to your key pointer or handle for deallocation or cleaning up any other + * references. There is an optionally selectable garbage collector that will + * take care of free()ing key pointers if your keys point to memory areas. + * You have to pass uhtbl_gc_key as fct_gc parameter to use it. You may also + * call this function in your custom garbage collector. + * + * WARNING: Your garbage collector function must otherwise not change the + * metadata in the uhtbl_head_t structure of the bucket else behaviour will be + * undefined for all subsequent actions. + * + * + * Example: + * struct mybucket { + * uhtbl_head_t head; + * int mypayload1; + * int mypayload2; + * } + * + * uhtbl_t table; + * uhtbl_init(&table, sizeof(struct mybucket), 32, MurmurHash2, NULL); + * + * Returns 0 on success or a negative error code. + */ +UHTBL_API int uhtbl_init(uhtbl_t *tbl, uint32_t bucketsize, +uhtbl_size_t sizehint, uhtbl_hash_t *fct_hash, uhtbl_gc_t *fct_gc); + +/** + * uhtbl_get() - Get a bucket by its key. + * @tbl: hash table + * @key: key + * @len: length of key + * + * Finds and returns the bucket with a given key. + * + * Key can either be: + * 1. A pointer to a memory area then len is its length (must be < 64KB) + * 2. A NULL-pointer then len is a locally stored numerical key + * + * + * Example: + * struct mybucket *bucket; + * bucket = uhtbl_get(table, "foo", sizeof("foo")); + * printf("%i", bucket->mypayload1); + * + * bucket = uhtbl_get(table, NULL, 42); + * printf("%i", bucket->mypayload1); + * + * Returns the bucket or NULL if no bucket with given key was found. + */ +UHTBL_API void* uhtbl_get(uhtbl_t *tbl, const void *key, long len); + +/** + * uhtbl_set() - Sets a bucket for given key. + * @tbl: hash table + * @key: key + * @len: length of key + * + * Sets a new bucket for the given key and returns a pointer to the bucket for + * you to assign your payload data. If there is already a bucket with that key + * it will be unset first. + * + * Key can either be: + * 1. A pointer to a memory area then len is its length (must be < 64KB) + * 2. A NULL-pointer then len is a locally stored numerical key + * + * NOTE: If key is a pointer memory management of it will be your business. + * You might want to use a garbage collection function (see uhtbl_init()) + * + * NOTE: The payload area of your bucket is NOT initialized to zeroes. + * + * WARNING: Note the following side effects when setting previously unset keys: + * 1. A set may trigger several moving actions changing the order of buckets. + * 2. A set may trigger a rehashing cycle if all buckets are occupied. + * Therefore accessing any previously acquired pointers to any bucket results in + * undefined behaviour. In addition iterations which have started before may + * result in unwanted behaviour (e.g. buckets may be skipped or visited twice). + * + * + * Example: + * struct mybucket *bucket; + * bucket = uhtbl_set(table, "foo", sizeof("foo")); + * bucket->mypayload1 = 42: + * + * bucket = uhtbl_set(table, NULL, 42); + * bucket->mypayload1 = 1337; + * + * + * Returns the bucket or NULL if no bucket could be allocated (out of memory). + */ +UHTBL_API void* uhtbl_set(uhtbl_t *tbl, void *key, long len); + +/** + * uhtbl_next() - Iterates over all entries of the hash table. + * @tbl: hash table + * @iter: Iteration counter + * + * Iterates over all entries of the hash table. + * + * iter is a pointer to a numeric variable that should be set to zero before + * the first call and will save the iteration state. + * + * NOTE: You may safely do several iterations in parallel. You may also safely + * unset any buckets of the hashtable or set keys that are currently in the + * hash table. However setting buckets with keys that don't have an assigned + * bucket yet results in undefined behaviour. + * + * Example: + * uint32_t iter = 0; + * struct mybucket *bucket; + * while ((bucket = uhtbl_next(table, &iter))) { + * printf("%i", bucket->mypayload1); + * } + * + * Return the next bucket or NULL if all buckets were already visited. + */ +UHTBL_API void* uhtbl_next(uhtbl_t *tbl, uhtbl_size_t *iter); + +/** + * uhtbl_unset() - Unsets the bucket with given key. + * @tbl: hash table + * @key: key + * @len: length of key (optional) + * + * Unsets the bucket with given key and calls the garbage collector to free + * any payload resources - if any. + * + * Key can either be: + * 1. A pointer to a memory area then len is its length (must be < 64KB) + * 2. A NULL-pointer then len is a locally stored numerical key + * + * Example: + * uhtbl_unset(table, NULL, 42); + * + * Returns 0 on success or a negative error code if there was no matching bucket + */ +UHTBL_API int uhtbl_unset(uhtbl_t *tbl, const void *key, long len); + +/** + * uhtbl_remove() - Unsets a bucket. + * @tbl: hash table + * @head: bucket head + * + * Unsets the bucket with given address and calls the garbage collector to free + * any payload resources - if any. + * + * Example: + * uhtbl_remove(table, &bucket->head); + * + * Returns 0 on success or a negative error code if the bucket was not found + */ +UHTBL_API int uhtbl_remove(uhtbl_t *tbl, uhtbl_head_t *head); + +/** + * uhtbl_clear() - Clears the hashtable without freeing its memory. + * @tbl: hash table + * + * Clears all buckets of the hashtable invoking the garbage collector - if any + * but does not free the memory of the hash table. This is usually more + * efficient than iterating and using unset. + * + * Returns nothing. + */ +UHTBL_API void uhtbl_clear(uhtbl_t *tbl); + +/** + * uhtbl_resize() - Resizes and rehashes the hash table. + * @tbl: hash table + * @payload: Buckets to reserve. + * + * Resizes the hash table and rehashes its entries. + * + * payload is the number of buckets the hashtable should allocate. It must be + * greater or at least equal to the number of buckets currently occupied. + * + * NOTE: Rehashing is an expensive process which should be avoided if possible. + * However resizing will be automatically done if you try to set a new bucket + * but all buckets are already occupied. In this case the payload bucket count + * is usually doubled. There is currently no automatic resizing done when the + * bucket usage count decreases. You have to take care of this by yourself. + * + * Returns 0 on success or a negative error code if out of memory. + */ +UHTBL_API int uhtbl_resize(uhtbl_t *tbl, uhtbl_size_t payload); + +/** + * uhtbl_clear() - Clears the hashtable and frees the bucket memory. + * @tbl: hash table + * + * Clears all buckets of the hashtable invoking the garbage collector - if any + * and frees the memory occupied by the buckets. + * + * Returns nothing. + */ +UHTBL_API void uhtbl_finalize(uhtbl_t *tbl); + +/** + * uhtbl_key() - Returns the key parameters as passed to set. + * @head: Bucket head + * @key: Pointer where key pointer should be stored (optional) + * @len: Pointer where key len should be stored (optional) + * + * This function might be useful to obtain the key parameters of a bucket + * when doing garbage collection. + * + * Returns nothing. + */ +UHTBL_API void uhtbl_key(uhtbl_head_t *head, void **key, long *len); + +/** + * uhtbl_gc_key() - Basic garbage collector that frees key memory. + * @bucket: Bucket + * + * This function is a basic garbage collector that will free any key pointers. + * However it will not touch your payload data. + * + * WARNING: You must not call this function directly on any bucket otherwise + * behaviour will be unspecified. Instead you may pass this function to the + * uhtbl_init function. You may also call this function from inside a custom + * garbage collector. + * + * Returns nothing. + */ +UHTBL_API void uhtbl_gc_key(void *bucket); + +#endif /* UHTBL_H_ */ diff --git a/ulog.h b/ulog.h new file mode 100644 index 0000000..ce0cfb2 --- /dev/null +++ b/ulog.h @@ -0,0 +1,31 @@ +/* + * Copyright (C) 2010 John Crispin + * Copyright (C) 2010 Steven Barth + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#ifndef _ULOG_H__ +#define _ULOG_H__ + +#include + +#define LOG log_printf +#define log_start(name, daemon) \ + openlog(name, (LOG_PERROR | LOG_CONS), LOG_USER) +#define log_printf(...) syslog(LOG_NOTICE, __VA_ARGS__) + +#endif diff --git a/uloop.c b/uloop.c new file mode 100644 index 0000000..627ba1c --- /dev/null +++ b/uloop.c @@ -0,0 +1,272 @@ +/* + * Copyright (C) 2010 Felix Fietkau + * Copyright (C) 2010 John Crispin + * Copyright (C) 2010 Steven Barth + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "uloop.h" + +/** + * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17 + */ +#ifndef EPOLLRDHUP +#define EPOLLRDHUP 0x2000 +#endif + +#ifndef ARRAY_SIZE +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) +#endif + +struct uloop_timeout *first_timeout; +static int epoll_fd; +static bool cancel; + +int uloop_fd_add(struct uloop_fd *sock, unsigned int flags) +{ + struct epoll_event ev; + int op = sock->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD; + unsigned int fl; + int ret; + + if (!sock->registered) { + fl = fcntl(sock->fd, F_GETFL, 0); + fl |= O_NONBLOCK; + fcntl(sock->fd, F_SETFL, fl); + } + + memset(&ev, 0, sizeof(struct epoll_event)); + + if (flags & ULOOP_READ) + ev.events |= EPOLLIN | EPOLLRDHUP; + + if (flags & ULOOP_WRITE) + ev.events |= EPOLLOUT; + + if (flags & ULOOP_EDGE_TRIGGER) + ev.events |= EPOLLET; + + ev.data.fd = sock->fd; + ev.data.ptr = sock; + + ret = epoll_ctl(epoll_fd, op, sock->fd, &ev); + if (ret < 0) + goto out; + + sock->registered = true; + sock->eof = false; + +out: + return ret; +} + +int uloop_fd_delete(struct uloop_fd *sock) +{ + sock->registered = false; + return epoll_ctl(epoll_fd, EPOLL_CTL_DEL, sock->fd, 0); +} + +static int tv_diff(struct timeval *t1, struct timeval *t2) +{ + if (t1->tv_sec != t2->tv_sec) + return (t1->tv_sec - t2->tv_sec) * 1000; + else + return (t1->tv_usec - t2->tv_usec) / 1000; +} + +int uloop_timeout_add(struct uloop_timeout *timeout) +{ + struct uloop_timeout **head = &first_timeout; + struct uloop_timeout *prev = NULL; + + if (timeout->pending) + return -1; + + while (*head) { + if (tv_diff(&(*head)->time, &timeout->time) > 0) + break; + + prev = *head; + head = &(*head)->next; + } + + timeout->prev = prev; + timeout->next = *head; + if (timeout->next) + timeout->next->prev = timeout; + *head = timeout; + timeout->pending = true; + + return 0; +} + +int uloop_timeout_set(struct uloop_timeout *timeout, int msecs) +{ + struct timeval *time = &timeout->time; + + if (timeout->pending) + uloop_timeout_cancel(timeout); + + gettimeofday(&timeout->time, NULL); + + time->tv_sec += msecs / 1000; + time->tv_usec += msecs % 1000; + + if (time->tv_usec > 1000000) { + time->tv_sec++; + time->tv_usec %= 100000; + } + + return uloop_timeout_add(timeout); +} + +int uloop_timeout_cancel(struct uloop_timeout *timeout) +{ + if (!timeout->pending) + return -1; + + if (timeout->prev) + timeout->prev->next = timeout->next; + else + first_timeout = timeout->next; + + if (timeout->next) + timeout->next->prev = timeout->prev; + + timeout->pending = false; + + return 0; +} + +static void uloop_handle_sigint(int signo) +{ + cancel = true; +} + +static void uloop_setup_signals(void) +{ + struct sigaction s; + memset(&s, 0, sizeof(struct sigaction)); + s.sa_handler = uloop_handle_sigint; + s.sa_flags = 0; + sigaction(SIGINT, &s, NULL); +} + +static int uloop_get_next_timeout(struct timeval *tv) +{ + int diff; + + if (!first_timeout) + return -1; + + diff = tv_diff(&first_timeout->time, tv); + if (diff < 0) + return 0; + + return diff; +} + +static void uloop_process_timeouts(struct timeval *tv) +{ + struct uloop_timeout *timeout; + + while (first_timeout) { + if (tv_diff(&first_timeout->time, tv) > 0) + break; + + timeout = first_timeout; + uloop_timeout_cancel(timeout); + if (timeout->cb) + timeout->cb(timeout); + } +} + +void uloop_end(void) +{ + cancel = true; +} + +int uloop_init(void) +{ + epoll_fd = epoll_create(32); + if (epoll_fd < 0) + return -1; + + fcntl(epoll_fd, F_SETFD, fcntl(epoll_fd, F_GETFD) | FD_CLOEXEC); + return 0; +} + +void uloop_run(void) +{ + struct epoll_event events[10]; + struct timeval tv; + int timeout; + int nfds, n; + + uloop_setup_signals(); + while(!cancel) + { + gettimeofday(&tv, NULL); + uloop_process_timeouts(&tv); + timeout = uloop_get_next_timeout(&tv); + nfds = epoll_wait(epoll_fd, events, ARRAY_SIZE(events), timeout); + for(n = 0; n < nfds; ++n) + { + struct uloop_fd *u = events[n].data.ptr; + unsigned int ev = 0; + + if(events[n].events & EPOLLERR) { + u->error = true; + uloop_fd_delete(u); + } + + if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR))) + continue; + + if(events[n].events & EPOLLRDHUP) + u->eof = true; + + if(events[n].events & EPOLLIN) + ev |= ULOOP_READ; + + if(events[n].events & EPOLLOUT) + ev |= ULOOP_WRITE; + + if(u->cb) + u->cb(u, ev); + } + } +} + +void uloop_done(void) +{ + close(epoll_fd); +} diff --git a/uloop.h b/uloop.h new file mode 100644 index 0000000..f84050a --- /dev/null +++ b/uloop.h @@ -0,0 +1,66 @@ +/* + * Copyright (C) 2010 Felix Fietkau + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#ifndef _ULOOP_H__ +#define _ULOOP_H__ + +#include +#include + +struct uloop_fd; +struct uloop_timeout; + +typedef void (*uloop_fd_handler)(struct uloop_fd *u, unsigned int events); +typedef void (*uloop_timeout_handler)(struct uloop_timeout *t); + +#define ULOOP_READ (1 << 0) +#define ULOOP_WRITE (1 << 1) +#define ULOOP_EDGE_TRIGGER (1 << 2) + +struct uloop_fd +{ + uloop_fd_handler cb; + int fd; + bool eof; + bool error; + bool registered; +}; + +struct uloop_timeout +{ + uloop_timeout_handler cb; + struct uloop_timeout *prev; + struct uloop_timeout *next; + struct timeval time; + bool pending; +}; + +int uloop_fd_add(struct uloop_fd *sock, unsigned int flags); +int uloop_fd_delete(struct uloop_fd *sock); + +int uloop_timeout_add(struct uloop_timeout *timeout); +int uloop_timeout_set(struct uloop_timeout *timeout, int msecs); +int uloop_timeout_cancel(struct uloop_timeout *timeout); + +void uloop_end(void); +int uloop_init(void); +void uloop_run(void); +void uloop_done(void); + +#endif diff --git a/unl.c b/unl.c new file mode 100644 index 0000000..a60ba08 --- /dev/null +++ b/unl.c @@ -0,0 +1,290 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "unl.h" + +static int unl_init(struct unl *unl) +{ + unl->sock = nl_socket_alloc(); + if (!unl->sock) + return -1; + + return 0; +} + +int unl_genl_init(struct unl *unl, const char *family) +{ + memset(unl, 0, sizeof(*unl)); + + if (unl_init(unl)) + goto error_out; + + unl->hdrlen = NLMSG_ALIGN(sizeof(struct genlmsghdr)); + unl->family_name = strdup(family); + if (!unl->family_name) + goto error; + + if (genl_connect(unl->sock)) + goto error; + + if (genl_ctrl_alloc_cache(unl->sock, &unl->cache)) + goto error; + + unl->family = genl_ctrl_search_by_name(unl->cache, family); + if (!unl->family) + goto error; + + return 0; + +error: + unl_free(unl); +error_out: + return -1; +} + +void unl_free(struct unl *unl) +{ + if (unl->family_name) + free(unl->family_name); + + if (unl->sock) + nl_socket_free(unl->sock); + + if (unl->cache) + nl_cache_free(unl->cache); + + memset(unl, 0, sizeof(*unl)); +} + +static int +ack_handler(struct nl_msg *msg, void *arg) +{ + int *err = arg; + *err = 0; + return NL_STOP; +} + +static int +finish_handler(struct nl_msg *msg, void *arg) +{ + int *err = arg; + *err = 0; + return NL_SKIP; +} + +static int +error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg) +{ + int *ret = arg; + *ret = err->error; + return NL_SKIP; +} + +struct nl_msg *unl_genl_msg(struct unl *unl, int cmd, bool dump) +{ + struct nl_msg *msg; + int flags = 0; + + msg = nlmsg_alloc(); + if (!msg) + goto out; + + if (dump) + flags |= NLM_F_DUMP; + + genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, + genl_family_get_id(unl->family), 0, flags, cmd, 0); + +out: + return msg; +} + +int unl_genl_request(struct unl *unl, struct nl_msg *msg, unl_cb handler, void *arg) +{ + struct nlmsghdr *nlh; + struct nl_cb *cb; + int err; + + cb = nl_cb_alloc(NL_CB_CUSTOM); + nlh = nlmsg_hdr(msg); + + err = nl_send_auto_complete(unl->sock, msg); + if (err < 0) + goto out; + + err = 1; + nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err); + nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err); + nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err); + if (handler) + nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, handler, arg); + + while (err > 0) + nl_recvmsgs(unl->sock, cb); + +out: + nlmsg_free(msg); + nl_cb_put(cb); + return err; +} + +static int request_single_cb(struct nl_msg *msg, void *arg) +{ + struct nl_msg **dest = arg; + + if (!*dest) { + nlmsg_get(msg); + *dest = msg; + } + return NL_SKIP; +} + +int unl_genl_request_single(struct unl *unl, struct nl_msg *msg, struct nl_msg **dest) +{ + *dest = NULL; + return unl_genl_request(unl, msg, request_single_cb, dest); +} + +static int no_seq_check(struct nl_msg *msg, void *arg) +{ + return NL_OK; +} + +void unl_genl_loop(struct unl *unl, unl_cb handler, void *arg) +{ + struct nl_cb *cb; + + cb = nl_cb_alloc(NL_CB_CUSTOM); + unl->loop_done = false; + nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL); + nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, handler, arg); + + while (!unl->loop_done) + nl_recvmsgs(unl->sock, cb); + + nl_cb_put(cb); +} + +static int unl_genl_multicast_id(struct unl *unl, const char *name) +{ + struct nlattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1]; + struct nlattr *groups, *group; + struct nl_msg *msg; + int ctrlid; + int ret = -1; + int rem; + + msg = nlmsg_alloc(); + if (!msg) + return -1; + + ctrlid = genl_ctrl_resolve(unl->sock, "nlctrl"); + genlmsg_put(msg, 0, 0, ctrlid, 0, 0, CTRL_CMD_GETFAMILY, 0); + NLA_PUT_STRING(msg, CTRL_ATTR_FAMILY_NAME, unl->family_name); + unl_genl_request_single(unl, msg, &msg); + if (!msg) + goto nla_put_failure; + + groups = unl_find_attr(unl, msg, CTRL_ATTR_MCAST_GROUPS); + if (!groups) + goto fail; + + nla_for_each_nested(group, groups, rem) { + const char *gn; + + nla_parse(tb, CTRL_ATTR_MCAST_GRP_MAX, nla_data(group), + nla_len(group), NULL); + + if (!tb[CTRL_ATTR_MCAST_GRP_NAME] || + !tb[CTRL_ATTR_MCAST_GRP_ID]) + continue; + + gn = nla_data(tb[CTRL_ATTR_MCAST_GRP_NAME]); + if (strcmp(gn, name) != 0) + continue; + + ret = nla_get_u32(tb[CTRL_ATTR_MCAST_GRP_ID]); + break; + } + +fail: + nlmsg_free(msg); +nla_put_failure: + return ret; +} + +int unl_genl_subscribe(struct unl *unl, const char *name) +{ + int mcid; + + mcid = unl_genl_multicast_id(unl, name); + if (mcid < 0) + return mcid; + + return nl_socket_add_membership(unl->sock, mcid); +} + +int unl_genl_unsubscribe(struct unl *unl, const char *name) +{ + int mcid; + + mcid = unl_genl_multicast_id(unl, name); + if (mcid < 0) + return mcid; + + return nl_socket_drop_membership(unl->sock, mcid); +} + +int unl_nl80211_phy_lookup(const char *name) +{ + char buf[32]; + int fd, pos; + + snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", name); + + fd = open(buf, O_RDONLY); + if (fd < 0) + return -1; + pos = read(fd, buf, sizeof(buf) - 1); + if (pos < 0) { + close(fd); + return -1; + } + buf[pos] = '\0'; + close(fd); + return atoi(buf); +} + +int unl_nl80211_wdev_to_phy(struct unl *unl, int wdev) +{ + struct nl_msg *msg; + struct nlattr *attr; + int ret = -1; + + msg = unl_genl_msg(unl, NL80211_CMD_GET_INTERFACE, false); + if (!msg) + return -1; + + NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, wdev); + if (unl_genl_request_single(unl, msg, &msg) < 0) + return -1; + + attr = unl_find_attr(unl, msg, NL80211_ATTR_WIPHY); + if (!attr) + goto out; + + ret = nla_get_u32(attr); +out: +nla_put_failure: + nlmsg_free(msg); + return ret; +} + + diff --git a/unl.h b/unl.h new file mode 100644 index 0000000..57e348a --- /dev/null +++ b/unl.h @@ -0,0 +1,46 @@ +#ifndef __UNL_H +#define __UNL_H + +#include +#include +#include +#include + +struct unl { + struct nl_sock *sock; + struct nl_cache *cache; + struct genl_family *family; + char *family_name; + int hdrlen; + bool loop_done; +}; + +int unl_genl_init(struct unl *unl, const char *family); +void unl_free(struct unl *unl); + +typedef int (*unl_cb)(struct nl_msg *, void *); + +struct nl_msg *unl_genl_msg(struct unl *unl, int cmd, bool dump); +int unl_genl_request(struct unl *unl, struct nl_msg *msg, unl_cb handler, void *arg); +int unl_genl_request_single(struct unl *unl, struct nl_msg *msg, struct nl_msg **dest); +void unl_genl_loop(struct unl *unl, unl_cb handler, void *arg); + +int unl_genl_subscribe(struct unl *unl, const char *name); +int unl_genl_unsubscribe(struct unl *unl, const char *name); + +int unl_nl80211_phy_lookup(const char *name); +int unl_nl80211_wdev_to_phy(struct unl *unl, int wdev); +struct nl_msg *unl_nl80211_phy_msg(struct unl *unl, int phy, int cmd, bool dump); +struct nl_msg *unl_nl80211_vif_msg(struct unl *unl, int dev, int cmd, bool dump); + +static inline void unl_loop_done(struct unl *unl) +{ + unl->loop_done = true; +} + +static inline struct nlattr *unl_find_attr(struct unl *unl, struct nl_msg *msg, int attr) +{ + return nlmsg_find_attr(nlmsg_hdr(msg), unl->hdrlen, attr); +} + +#endif diff --git a/usock.c b/usock.c new file mode 100644 index 0000000..613b2dd --- /dev/null +++ b/usock.c @@ -0,0 +1,102 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "usock.h" + +int usock(int type, const char *host, const char *service) { + int sock = -1; + + if (service && !(type & USOCK_UNIX)) { + struct addrinfo *result, *rp; + + struct addrinfo hints = { + .ai_family = (type & USOCK_IPV6ONLY) ? AF_INET6 : + (type & USOCK_IPV4ONLY) ? AF_INET : AF_UNSPEC, + .ai_socktype = ((type & 0xff) == USOCK_TCP) + ? SOCK_STREAM : SOCK_DGRAM, + .ai_flags = AI_ADDRCONFIG + | ((type & USOCK_SERVER) ? AI_PASSIVE : 0) + | ((type & USOCK_NUMERIC) ? AI_NUMERICHOST : 0), + }; + + if (getaddrinfo(host, service, &hints, &result)) { + return -1; + } + + for (rp = result; rp != NULL; rp = rp->ai_next) { + if ((sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) + == -1) { + continue; + } + + if (!(type & USOCK_NOCLOEXEC)) { + fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC); + } + + if (type & USOCK_NONBLOCK) { + fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK); + } + + if (type & USOCK_SERVER) { + const int one = 1; + setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); + + if (!bind(sock, rp->ai_addr, rp->ai_addrlen) + && ((type & 0xff) != USOCK_TCP || !listen(sock, SOMAXCONN))) { + break; + } + } else { + if (!connect(sock, rp->ai_addr, rp->ai_addrlen) + || errno == EINPROGRESS) { + break; + } + } + + close(sock); + sock = -1; + } + freeaddrinfo(result); + } else { + struct sockaddr_un sun = {.sun_family = AF_UNIX}; + if (strlen(host) >= sizeof(sun.sun_path)) { + errno = EINVAL; + return -1; + } + strcpy(sun.sun_path, host); + + if ((sock = socket(AF_UNIX, ((type & 0xff) == USOCK_TCP) + ? SOCK_STREAM : SOCK_DGRAM, 0)) == -1) { + return -1; + } + + if (!(type & USOCK_NOCLOEXEC)) { + fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC); + } + + if (type & USOCK_NONBLOCK) { + fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK); + } + + if (type & USOCK_SERVER) { + if (bind(sock, (struct sockaddr*)&sun, sizeof(sun)) || + ((type & 0xff) == USOCK_TCP && listen(sock, SOMAXCONN))) { + close(sock); + return -1; + } + } else { + if (connect(sock, (struct sockaddr*)&sun, sizeof(sun)) + && errno != EINPROGRESS) { + close(sock); + return -1; + } + } + } + return sock; +} diff --git a/usock.h b/usock.h new file mode 100644 index 0000000..12f8127 --- /dev/null +++ b/usock.h @@ -0,0 +1,17 @@ +#ifndef USOCK_H_ +#define USOCK_H_ + +#define USOCK_TCP 0 +#define USOCK_UDP 1 + +#define USOCK_SERVER 0x0100 +#define USOCK_NOCLOEXEC 0x0200 +#define USOCK_NONBLOCK 0x0400 +#define USOCK_NUMERIC 0x0800 +#define USOCK_IPV6ONLY 0x2000 +#define USOCK_IPV4ONLY 0x4000 +#define USOCK_UNIX 0x8000 + +int usock(int type, const char *host, const char *service); + +#endif /* USOCK_H_ */